2012 Vol. 45 No. 3
2012, 45(3): 1-12.
Abstract：
Metallogenic unit is a geological unit on the metallogenic significance. The latest classification scheme about Chinese metallogenic units released by the national mineral resource potential assessment project include level Ⅰ (metallogenic domain), level Ⅱ (metallogenic provinces) and level Ⅲ (metallogenic belts). This article revises the boundaries of the six level Ⅲ metallogenic units (metallogenic belts) in the East Tianshan-Beishan area on the basis of the inheritance of this classification scheme. Then the six level Ⅲ metallogenic units are divided into 11 class Ⅳ metallogenic units (metallogenic sub-zone)as a symbol of sgnificant stratigraphic, tectonic and magmatic belt and associated mineralization. Furthermore, there is a summary about geology and mineral characteristics of every class Ⅳ metallogenic unit (metallogenic subzones).
Metallogenic unit is a geological unit on the metallogenic significance. The latest classification scheme about Chinese metallogenic units released by the national mineral resource potential assessment project include level Ⅰ (metallogenic domain), level Ⅱ (metallogenic provinces) and level Ⅲ (metallogenic belts). This article revises the boundaries of the six level Ⅲ metallogenic units (metallogenic belts) in the East Tianshan-Beishan area on the basis of the inheritance of this classification scheme. Then the six level Ⅲ metallogenic units are divided into 11 class Ⅳ metallogenic units (metallogenic sub-zone)as a symbol of sgnificant stratigraphic, tectonic and magmatic belt and associated mineralization. Furthermore, there is a summary about geology and mineral characteristics of every class Ⅳ metallogenic unit (metallogenic subzones).
Abstract：
Metamorphic intrusive rocks (bodies) into Jinshuikou rock group of the Paleo-proterozic were found. The isotope age determination shows they are the Neo-Proterozoic. The metamorphic intrusive rocks (bodies) derived with aluminum calcalkaline series, and resulted from a tectonic environment of synchronous collision. The discovery of metamorphic intrusive rocks (rodies) has important significance to a thorough invest-tigation and study of Presinian period basement in the west of eastern Kunlun Mt. And it is of great significance to resume or confirm the developing and evolvement history of Qimantage tectono-magma belt.
Metamorphic intrusive rocks (bodies) into Jinshuikou rock group of the Paleo-proterozic were found. The isotope age determination shows they are the Neo-Proterozoic. The metamorphic intrusive rocks (bodies) derived with aluminum calcalkaline series, and resulted from a tectonic environment of synchronous collision. The discovery of metamorphic intrusive rocks (rodies) has important significance to a thorough invest-tigation and study of Presinian period basement in the west of eastern Kunlun Mt. And it is of great significance to resume or confirm the developing and evolvement history of Qimantage tectono-magma belt.
2012, 45(3): 20-25.
Abstract：
On the basis of analysis and research of previous datum, it is put forward that ophiolitic melange of Aletunkunduo is the extended eastward part of ophiolitic belt from Kalameili, which starts from the belt of Kalameili-Tazale-Daheishan-Aletunkunduo in the west. Plagioclase granite in the ophiolitic melange occurs in the top of gabbro, they have gradually or abruptly changing contact relationship. With SHRIMP method Zircon U-Pb Dating is carried out with Plagioclase granite, the result is(351±6 Ma)that reflects that ophiolitic melange of Aletunkunduo have formed in 351Ma. Meanwhile the study on ophiolitic melange overlying rocks in the Late Carboniferous can also state that ophiolitic melange from Aletunkunduo emplacement ages is not later than Late Carboniferous.
On the basis of analysis and research of previous datum, it is put forward that ophiolitic melange of Aletunkunduo is the extended eastward part of ophiolitic belt from Kalameili, which starts from the belt of Kalameili-Tazale-Daheishan-Aletunkunduo in the west. Plagioclase granite in the ophiolitic melange occurs in the top of gabbro, they have gradually or abruptly changing contact relationship. With SHRIMP method Zircon U-Pb Dating is carried out with Plagioclase granite, the result is(351±6 Ma)that reflects that ophiolitic melange of Aletunkunduo have formed in 351Ma. Meanwhile the study on ophiolitic melange overlying rocks in the Late Carboniferous can also state that ophiolitic melange from Aletunkunduo emplacement ages is not later than Late Carboniferous.
Abstract：
In the 1980s geological team veteran found large gold deposits in Guilaizhuang in Pingyi County, Shandong Province, which achieved a major breakthrough in Luxi gold prospecting. Then, they found Zhuojiazhuang, Mofanggou, Longbaoshan gold deposits in Luxi. In recent years in Yinan deep exploration people found new gold orebody, Luxi good prospects for gold mineralization have caused widespread concern in geology. At present, most Luxi gold deposits were found in Tongshi, Tongjing, and Longbaoshan near the Mesozoic complex bodies. The rock genesis is worth studying. According to the analysis of above-mentioned rock geochemistry characteristics of the REE, each rock non-contemporaneous intrusive magmatite which distribution pattern of REE being similar arc line of rightwards steep, and its distribution pattern of synthesized REE have similar properties, both have not obvious Ce and Eu anomaly showing that they are from the same magma room of the deep earth. The understanding of Luxi gold prospecting for guiding has great significance.
In the 1980s geological team veteran found large gold deposits in Guilaizhuang in Pingyi County, Shandong Province, which achieved a major breakthrough in Luxi gold prospecting. Then, they found Zhuojiazhuang, Mofanggou, Longbaoshan gold deposits in Luxi. In recent years in Yinan deep exploration people found new gold orebody, Luxi good prospects for gold mineralization have caused widespread concern in geology. At present, most Luxi gold deposits were found in Tongshi, Tongjing, and Longbaoshan near the Mesozoic complex bodies. The rock genesis is worth studying. According to the analysis of above-mentioned rock geochemistry characteristics of the REE, each rock non-contemporaneous intrusive magmatite which distribution pattern of REE being similar arc line of rightwards steep, and its distribution pattern of synthesized REE have similar properties, both have not obvious Ce and Eu anomaly showing that they are from the same magma room of the deep earth. The understanding of Luxi gold prospecting for guiding has great significance.
Abstract：
The chert from Hongshan iron deposit is closely associated with the iron ore body, and some cherts are iron ores themself. Chemical analysis of the chert shows that it generally has the features of high content of Si and Fe, low content of Al, and higher content of K2O than Na2O, and the ratio of Fe/Ti is between 57.14-218.74, (Fe+Mn)/Ti is between 57.54-224.16, Al/(Al+Fe+Mn) is between 0.05-0.14, which are all according with the features of hydrothermal sedimentary chert, but with little terrigenous materials. Trace element analysis of the chert shows that most of the trace elements are lower than the Clarke value and the total REE is lower. Normalized by the North American shale, HREE is richer than LREE, and the geochemical characteristics of the chert indicate that they are hydrothermally sedimentary origin, but with existence of certain continental sources. So it can be concluded that the Hongshan iron deposit is associated with hydrothermal deposite with terrigenous materials and it was formed in the environment of continental margin.
The chert from Hongshan iron deposit is closely associated with the iron ore body, and some cherts are iron ores themself. Chemical analysis of the chert shows that it generally has the features of high content of Si and Fe, low content of Al, and higher content of K2O than Na2O, and the ratio of Fe/Ti is between 57.14-218.74, (Fe+Mn)/Ti is between 57.54-224.16, Al/(Al+Fe+Mn) is between 0.05-0.14, which are all according with the features of hydrothermal sedimentary chert, but with little terrigenous materials. Trace element analysis of the chert shows that most of the trace elements are lower than the Clarke value and the total REE is lower. Normalized by the North American shale, HREE is richer than LREE, and the geochemical characteristics of the chert indicate that they are hydrothermally sedimentary origin, but with existence of certain continental sources. So it can be concluded that the Hongshan iron deposit is associated with hydrothermal deposite with terrigenous materials and it was formed in the environment of continental margin.
Abstract：
The characteristics of petrochemistries, microelements and rare earth elements of sandstone samples from Chang9-10 members of Yanchang Formation of ling1 well are systematically studied. By using structural distinguished figures of different macroelements and microelements, the source area structural attributes of ling1 well are analyzed and discussed. The results show that: The microelement content in sandstone samples of Yanchang Formation from ling1 well area is stable; In microelement distribution curves, light rare earth elements (LREE) are evidently concentrated but heavy rare earth elements(HREE) are depleted; According to the structural distinguished figures of different macroelements and microelements, the structural backgrounds of source area are mainly active continental margin and islands; The Ling1 well area is located in hinterland in Odors basin, its sediments are mixed provenance, and its evolution course is controlled by Qinling orogenis belt which results from combination Huabei plate with Yangtze plate. To late Triassic, Qinling orogenis belt became stable source area of Ling1 well.
The characteristics of petrochemistries, microelements and rare earth elements of sandstone samples from Chang9-10 members of Yanchang Formation of ling1 well are systematically studied. By using structural distinguished figures of different macroelements and microelements, the source area structural attributes of ling1 well are analyzed and discussed. The results show that: The microelement content in sandstone samples of Yanchang Formation from ling1 well area is stable; In microelement distribution curves, light rare earth elements (LREE) are evidently concentrated but heavy rare earth elements(HREE) are depleted; According to the structural distinguished figures of different macroelements and microelements, the structural backgrounds of source area are mainly active continental margin and islands; The Ling1 well area is located in hinterland in Odors basin, its sediments are mixed provenance, and its evolution course is controlled by Qinling orogenis belt which results from combination Huabei plate with Yangtze plate. To late Triassic, Qinling orogenis belt became stable source area of Ling1 well.
Abstract：
The geological and geochemical characteristics of Xialadi ultrabasic rock of western Qinling were studied systematically in this paper. The results show that the characterization of Xialadi ultrabasic rocks is low SiO2, Mg rich and alkaline poor, in which metamorphic preexisting rocks belongs to the class of peridotite. The distribution of trace elements and rare earth elements (REE) among various rock types is different. The primary magma of Xialadi ultrabasic rocks originates from upper mantle, whose genetic type belongs to the mantle peridotite of subduction zone. Materials of crustal source and marine carbonate were added to Xialadi ultrabasic magma during its evolution, which resulted in the special geochemical composition characteristics of Xialadi ultramafic rocks with high Al2O3 and CaO. In this paper, a preliminary discussion was carried out on the reasons of the differences in geochemical characteristics of Xialadi ultrabasic rocks due to the effects of alteration.
The geological and geochemical characteristics of Xialadi ultrabasic rock of western Qinling were studied systematically in this paper. The results show that the characterization of Xialadi ultrabasic rocks is low SiO2, Mg rich and alkaline poor, in which metamorphic preexisting rocks belongs to the class of peridotite. The distribution of trace elements and rare earth elements (REE) among various rock types is different. The primary magma of Xialadi ultrabasic rocks originates from upper mantle, whose genetic type belongs to the mantle peridotite of subduction zone. Materials of crustal source and marine carbonate were added to Xialadi ultrabasic magma during its evolution, which resulted in the special geochemical composition characteristics of Xialadi ultramafic rocks with high Al2O3 and CaO. In this paper, a preliminary discussion was carried out on the reasons of the differences in geochemical characteristics of Xialadi ultrabasic rocks due to the effects of alteration.
2012, 45(3): 57-63.
Abstract：
The codepositional mechanism of tertiary lake facies carbonate in the western Qaidam basin was realized in chemical codeposition process. The results show that: 1) the codeposition is mainly due to the adsorption and coating of carbonate. 2) It increases the depositional rate of carbonate and promotes the separation between carbonate layer and debris grain layer. 3) Under the action of some forces, the movement between the layers will easily produces fractures in carbonate layer, and the codeposition plays a role in protecting miropores, which makes the part of lake facie carbon rock zones in the western Qaidam basin become the effective reservoirs.
The codepositional mechanism of tertiary lake facies carbonate in the western Qaidam basin was realized in chemical codeposition process. The results show that: 1) the codeposition is mainly due to the adsorption and coating of carbonate. 2) It increases the depositional rate of carbonate and promotes the separation between carbonate layer and debris grain layer. 3) Under the action of some forces, the movement between the layers will easily produces fractures in carbonate layer, and the codeposition plays a role in protecting miropores, which makes the part of lake facie carbon rock zones in the western Qaidam basin become the effective reservoirs.
2012, 45(3): 64-71.
Abstract：
The gold belt in Southern Tianshan is an important gold resource, where a number of very large gold mines have been found. These deposits are similar in tectonic setting, ore-bearing rock series, host rocks, ore-controlling structures, ore body, ore type, main metallic minerals, gold-bearing mineral, metallogenic epoch and pattern of metallogeny. However, further analysis found that there had been some differences among them, such as structural location, material composition and wall rock alteration. Analyzing some basic metallogenic characteristics of this district, we believe that the formation of the gold belt is closely related to the formation and evolution of the southern Tianshan orogenic belt. The main mineralization is the Variscan hydrothermal mineralization related to the activities of granite, and therefore the deposits should be veinlet-disseminated type gold deposits. This is an important gold type with great prospecting potential in southern Tianshan.
The gold belt in Southern Tianshan is an important gold resource, where a number of very large gold mines have been found. These deposits are similar in tectonic setting, ore-bearing rock series, host rocks, ore-controlling structures, ore body, ore type, main metallic minerals, gold-bearing mineral, metallogenic epoch and pattern of metallogeny. However, further analysis found that there had been some differences among them, such as structural location, material composition and wall rock alteration. Analyzing some basic metallogenic characteristics of this district, we believe that the formation of the gold belt is closely related to the formation and evolution of the southern Tianshan orogenic belt. The main mineralization is the Variscan hydrothermal mineralization related to the activities of granite, and therefore the deposits should be veinlet-disseminated type gold deposits. This is an important gold type with great prospecting potential in southern Tianshan.
2012, 45(3): 72-80.
Abstract：
According to research achievement of mineral exploration in depth of Xiaoqinling golddeposit region and prospecting practice for Chen'er gold ore deposit, it concluded that Xiaoqinling gold deposit region is another super-large ore cluster region, which have superior exploration condition and potential in depth. It has large favorable districts for exploration located in depth or surrounding of known deposits. Some exploration targets should be paid attention to, such as extending, lateral currence, and wedge out of main orebody. There is possiblity to find structure altered rock type gold deposit in depth of quartz vein type gold deposit. On the base of strengthening geology synthetical study and understanding metallogenic regularity, the effective methods for exploration in depth includes geology, geophysics, and geochemistry comprehensive new techniques, and so on. It can forecast deep enriched section of orebody by using the geochemical axis zoned model, and prove by drill project in hole.
According to research achievement of mineral exploration in depth of Xiaoqinling golddeposit region and prospecting practice for Chen'er gold ore deposit, it concluded that Xiaoqinling gold deposit region is another super-large ore cluster region, which have superior exploration condition and potential in depth. It has large favorable districts for exploration located in depth or surrounding of known deposits. Some exploration targets should be paid attention to, such as extending, lateral currence, and wedge out of main orebody. There is possiblity to find structure altered rock type gold deposit in depth of quartz vein type gold deposit. On the base of strengthening geology synthetical study and understanding metallogenic regularity, the effective methods for exploration in depth includes geology, geophysics, and geochemistry comprehensive new techniques, and so on. It can forecast deep enriched section of orebody by using the geochemical axis zoned model, and prove by drill project in hole.
Abstract：
Weining north mountain area lies in the copper, gold and multi-metal metallogenetic belt ranged from Weining north mountain area to Guyuan area of Ningxia, which belongs to the metallogenetic belt of North Qilian, where the gold, copper and iron mineralization has a significant effect. The gold orebodies occur as bed-like or lense, and mainly controlled by the faulted zone. The oxide ores are the main ore types, with few primary sulfide ores. It has a very sharp fluctuation in the amount of REE(∑REE=12.04×10-6-136.167×10-6)in the rocks of the gold deposit, with enriched LREE and depleted HREE. La/Yb value is 0.609-16.158 and Sm/Nd value is 0.18-0.275, which shows that the fractional distillation occurred in HREE and LREE. The value of δEu is 0.447-0.91, showing a depleted amount of Eu. The research suggests that the deposit appeared as a polygenic formation cause, relating to comprehensive factors from sedimentation and hot fluids and tectonic effects. The formation of the deposit is controlled by lithology, stratum and geological structure. But, the mineralization of the deposit subjected to the intrusion of the quartz diorite porphyrite. Pyritization, kaolinization, jarosite, silicification has occurred in the process of the ore mineralization, followed by a strong effect of oxidation leaching in the late period, which played a very significant role in the formation of the gold deposit.
Weining north mountain area lies in the copper, gold and multi-metal metallogenetic belt ranged from Weining north mountain area to Guyuan area of Ningxia, which belongs to the metallogenetic belt of North Qilian, where the gold, copper and iron mineralization has a significant effect. The gold orebodies occur as bed-like or lense, and mainly controlled by the faulted zone. The oxide ores are the main ore types, with few primary sulfide ores. It has a very sharp fluctuation in the amount of REE(∑REE=12.04×10-6-136.167×10-6)in the rocks of the gold deposit, with enriched LREE and depleted HREE. La/Yb value is 0.609-16.158 and Sm/Nd value is 0.18-0.275, which shows that the fractional distillation occurred in HREE and LREE. The value of δEu is 0.447-0.91, showing a depleted amount of Eu. The research suggests that the deposit appeared as a polygenic formation cause, relating to comprehensive factors from sedimentation and hot fluids and tectonic effects. The formation of the deposit is controlled by lithology, stratum and geological structure. But, the mineralization of the deposit subjected to the intrusion of the quartz diorite porphyrite. Pyritization, kaolinization, jarosite, silicification has occurred in the process of the ore mineralization, followed by a strong effect of oxidation leaching in the late period, which played a very significant role in the formation of the gold deposit.
2012, 45(3): 93-102.
Abstract：
De'erni copper deposit, located in the southern slope of De'erni, in the middle of Jishi Mountain, Maqin country, Qinghai Province, is a comprehensive utilization deposit which is dominated by copper. Because there are considerable differences in its ore-genesis, we have studied its ore-genesis by macro-observation, mineralogical studies and electron probe analysis in detail. This is the first time that barite and gypsum were discovered. Quartz-carbonate-barite-gypsum is not only a low-temperature mineral assemblage but also is a typical mineral composition of submarine hydrothermal deposit. By mineral environment of structure, material source, strawberry-like structure, siliceous rockslying at the top of the orebodies, the discovery of barite and gypsum, we suggest that De'erni copper deposit is hydrothermal exhalative-sedimentary deposit in seafloor.
De'erni copper deposit, located in the southern slope of De'erni, in the middle of Jishi Mountain, Maqin country, Qinghai Province, is a comprehensive utilization deposit which is dominated by copper. Because there are considerable differences in its ore-genesis, we have studied its ore-genesis by macro-observation, mineralogical studies and electron probe analysis in detail. This is the first time that barite and gypsum were discovered. Quartz-carbonate-barite-gypsum is not only a low-temperature mineral assemblage but also is a typical mineral composition of submarine hydrothermal deposit. By mineral environment of structure, material source, strawberry-like structure, siliceous rockslying at the top of the orebodies, the discovery of barite and gypsum, we suggest that De'erni copper deposit is hydrothermal exhalative-sedimentary deposit in seafloor.
2012, 45(3): 103-108.
Abstract：
Danao nickel deposit is located near the Western Bicol-Eastern Leyte ophiolite belt. Ore-bearing limonite and saprolite layers above ultramafic rocks consisted with red-brown soil where garnierite ores developed well. Chemical analysis showed that the mineralization source is ultramafic rocks; further analysis and study on the ultramafic rock, climate, geography, and degree of rocks fragmentation suggested the genesis type of deposit is weathering crust-eluvial type. According to the crust uplift, the ultramafic rocks weathered to release Ni2+ which was captured by the serpentines when infiltrated to the limonite and saprolite layers with surface water, isomorphied and then released Mg2+. Due to the high permeability, Mg2+ were enriched near the basement rocks, while Ni2+ serpentine was into the limonite and saprolite layers, precipitated down, and concentrated to mineralize.
Danao nickel deposit is located near the Western Bicol-Eastern Leyte ophiolite belt. Ore-bearing limonite and saprolite layers above ultramafic rocks consisted with red-brown soil where garnierite ores developed well. Chemical analysis showed that the mineralization source is ultramafic rocks; further analysis and study on the ultramafic rock, climate, geography, and degree of rocks fragmentation suggested the genesis type of deposit is weathering crust-eluvial type. According to the crust uplift, the ultramafic rocks weathered to release Ni2+ which was captured by the serpentines when infiltrated to the limonite and saprolite layers with surface water, isomorphied and then released Mg2+. Due to the high permeability, Mg2+ were enriched near the basement rocks, while Ni2+ serpentine was into the limonite and saprolite layers, precipitated down, and concentrated to mineralize.
2012, 45(3): 109-115.
Abstract：
Pikugou lead-zinc ore is located in Shan(Shanyang)-Zha(Zhashui)-Zhen(Zhnán)-Xun(Xunyang)polymetallic metallogenic area in the southern Qinling Mountains, in Gongguan-Huilong town a mercury, antimony, gold, silver, lead, zinc polymetallic metallogenic belt, found in Medial Devonian Yanglinggou Formatian carbonaceous limestone and Upper Devonian Luojiahe Formation carbonaceous phyllite contact zone by limestone side, two lithology between contact in fault, fault occurrence tendency 350° inclination 73°-77°. Based on the regional geology, ore body geology, and the ore controlling factors and so on, the lead-zinc metallogenic elements have obvious zonation, combined with the current drilling to expose and barium element distribution range, determining the lead-zinc ore is currently in the top phase, deep lead-zinc ore has more prospecting potential, combined with the transient electromagnetic anomaly and drilling data found in the line 1-0 and 6-8 there are two lead-zinc concealed orebodies.
Pikugou lead-zinc ore is located in Shan(Shanyang)-Zha(Zhashui)-Zhen(Zhnán)-Xun(Xunyang)polymetallic metallogenic area in the southern Qinling Mountains, in Gongguan-Huilong town a mercury, antimony, gold, silver, lead, zinc polymetallic metallogenic belt, found in Medial Devonian Yanglinggou Formatian carbonaceous limestone and Upper Devonian Luojiahe Formation carbonaceous phyllite contact zone by limestone side, two lithology between contact in fault, fault occurrence tendency 350° inclination 73°-77°. Based on the regional geology, ore body geology, and the ore controlling factors and so on, the lead-zinc metallogenic elements have obvious zonation, combined with the current drilling to expose and barium element distribution range, determining the lead-zinc ore is currently in the top phase, deep lead-zinc ore has more prospecting potential, combined with the transient electromagnetic anomaly and drilling data found in the line 1-0 and 6-8 there are two lead-zinc concealed orebodies.
2012, 45(3): 116-122.
Abstract：
The Haerdaban lead-zinc deposit is located in the Biezhentaoshan area of west part of the Western Tianshan, which belongs to Sailimu Cu, Pb, Zn, Nb, Ta, W and P metallogenic belt. Ore body, which is stable extension, occur in the low-grade metamorphic marine clastic rocks and carbonate rocks of the Middle Proterozoic Changcheng System. The main ore body is beds-, lens-like bedding output with banded, brecciated, and disseminated structure. Metal minerals in the ore are mainly galena and sphalerite. Moreover, mineral assemblages in gangue are simple, including calcite and dolomite. Compared with the Jiekeli strata-bound lead-zinc deposit in Kazakhstan, the Haerdaban lead-zinc deposit is similar to formed settings, times, locations, ore characteristics and quality. Preliminary analysis shows that its genetic types are stratabound type, which is discovered for the first time in Precambrian strata of western Tianshan. It is confirmed that the Jiekeli strata-bound lead-zinc deposit extended east to Sailimu area, Xinjiang, China. Furthermore, it is of great significance for lead and zinc exploration of the region in the future.
The Haerdaban lead-zinc deposit is located in the Biezhentaoshan area of west part of the Western Tianshan, which belongs to Sailimu Cu, Pb, Zn, Nb, Ta, W and P metallogenic belt. Ore body, which is stable extension, occur in the low-grade metamorphic marine clastic rocks and carbonate rocks of the Middle Proterozoic Changcheng System. The main ore body is beds-, lens-like bedding output with banded, brecciated, and disseminated structure. Metal minerals in the ore are mainly galena and sphalerite. Moreover, mineral assemblages in gangue are simple, including calcite and dolomite. Compared with the Jiekeli strata-bound lead-zinc deposit in Kazakhstan, the Haerdaban lead-zinc deposit is similar to formed settings, times, locations, ore characteristics and quality. Preliminary analysis shows that its genetic types are stratabound type, which is discovered for the first time in Precambrian strata of western Tianshan. It is confirmed that the Jiekeli strata-bound lead-zinc deposit extended east to Sailimu area, Xinjiang, China. Furthermore, it is of great significance for lead and zinc exploration of the region in the future.
2012, 45(3): 123-129.
Abstract：
The Bayan Tal Mo deposit is located in the Ulji-Oubu La Cu-Au Metallogenic belt, with Mo-bearing orebodies hosted by the upper Carboniferous Amushan Formation. The shape of orebody is obviously controlled by structures (mainly faults) and formation lithology, and distribution of which is consistent with skarn and hornfelsed rocks. Nowadays, two ore bodies are blocked out. The average grade and highest grade of molybdenum of ore body No.1-1 is 0.12×10-2 and 8.55×10-2, respectively, with great variation coefficient, while the average grade of ore body No.1-2 is 0.73×10-2. Alteration of this deposit is well developed, of which skarnization and hornfelization are closely associated with Mo mineralization. The geochemical anomalies have the element association of Mo, Au, Ag, Cu, Zn, W, Sn, and Bi, and they are consistent well with each other (abundence of each element in this deposit is four times more than its background value). Both the features of alteration and anomalous elements in the Bayan Tal Mo deposit have the characteristics of skarn deposit.
The Bayan Tal Mo deposit is located in the Ulji-Oubu La Cu-Au Metallogenic belt, with Mo-bearing orebodies hosted by the upper Carboniferous Amushan Formation. The shape of orebody is obviously controlled by structures (mainly faults) and formation lithology, and distribution of which is consistent with skarn and hornfelsed rocks. Nowadays, two ore bodies are blocked out. The average grade and highest grade of molybdenum of ore body No.1-1 is 0.12×10-2 and 8.55×10-2, respectively, with great variation coefficient, while the average grade of ore body No.1-2 is 0.73×10-2. Alteration of this deposit is well developed, of which skarnization and hornfelization are closely associated with Mo mineralization. The geochemical anomalies have the element association of Mo, Au, Ag, Cu, Zn, W, Sn, and Bi, and they are consistent well with each other (abundence of each element in this deposit is four times more than its background value). Both the features of alteration and anomalous elements in the Bayan Tal Mo deposit have the characteristics of skarn deposit.
2012, 45(3): 130-140.
Abstract：
Celestine deposit of Dafeng mountain is located in northwestern of Qaidam Basin,it is composed of Ⅰ,Ⅱ,Ⅲ,Ⅳ four deposits, and ore-formation is Shizigou group of the Pliocene in Tertiary strata, with seam-bit of unstable ore, ore body mostly by thin-bedded, lens-shaped or lenticular produced in carbon-bearing calcareous mudstone, and ore mainly for celestite, strontianite, etc. The EW, NEE secondary faults and the compound anticline with relieve minor axis strictly controlled the celestite ore output patterns in the Dafeng mountain ore area. Strontium-containing material source of mineralization is with multi-source in the area. On the one hand, water with strontium of the surrounding mountains is the main supplying source; on the other hand, water with oil fields of strontium-rich is supplying source too. In addition, brine with strontium in the deep crust plays an important role as supplying source; Genesis have the characteristics by continental lake chemical deposition-hydrothermal sedimentary superimposed transformation type in the Dafeng mountain area.
Celestine deposit of Dafeng mountain is located in northwestern of Qaidam Basin,it is composed of Ⅰ,Ⅱ,Ⅲ,Ⅳ four deposits, and ore-formation is Shizigou group of the Pliocene in Tertiary strata, with seam-bit of unstable ore, ore body mostly by thin-bedded, lens-shaped or lenticular produced in carbon-bearing calcareous mudstone, and ore mainly for celestite, strontianite, etc. The EW, NEE secondary faults and the compound anticline with relieve minor axis strictly controlled the celestite ore output patterns in the Dafeng mountain ore area. Strontium-containing material source of mineralization is with multi-source in the area. On the one hand, water with strontium of the surrounding mountains is the main supplying source; on the other hand, water with oil fields of strontium-rich is supplying source too. In addition, brine with strontium in the deep crust plays an important role as supplying source; Genesis have the characteristics by continental lake chemical deposition-hydrothermal sedimentary superimposed transformation type in the Dafeng mountain area.
2012, 45(3): 141-147.
Abstract：
In this paper, the regional geological characteristics, ore shape and type, mineral characteristics, ore chemical composition, quality of Mapo quartzite deposit were introduced. The deposit genesis was analyzed and the deposit was believed to be the sedimentary-metamorphic quartzite mine. The ore has complied with the quality of first-second degree of flat glass silicon material and can be used as the solar energy polycrystalline silicon material after purification.
In this paper, the regional geological characteristics, ore shape and type, mineral characteristics, ore chemical composition, quality of Mapo quartzite deposit were introduced. The deposit genesis was analyzed and the deposit was believed to be the sedimentary-metamorphic quartzite mine. The ore has complied with the quality of first-second degree of flat glass silicon material and can be used as the solar energy polycrystalline silicon material after purification.
2012, 45(3): 148-152.
Abstract：
Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.
Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.Pamir, in Tajikistan, located in alpine region, relatively lower geological researching level, lacks complete topographies with the scale of 1 to 50 000 and 1 to 100 000. Tajikistan has power protective policies, obtaining large scale topography data is very difficult, so to carry on regional geochemical survey topography data with scale of 1 to 250 000 has become the first key problem. According to the above matter, the project carries on monographic studies. Based on the ASTER-GDEM elevation data, platform of ARCGIS 9.0, disposing DEM data, we successfully extracted the topography and water system with the accuracy of 25 m. At the same time, the comparison between the extracted data and actual data indicates that the topographic data extracted is reliable and credible, and the accuracy is close to the scale of 1 to 50000. And finally the problem encountered above was solved, a new, quick and effective method for abroad geological survey is provided.
