LA-ICP-MS Zircon U-Pb Age, Geochemistry and Tectonic Implications of Metamorphic Dacite from Huaniushan Group in Beishan Area, Gansu, China
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摘要: 采用锆石U-Pb方法在甘肃北山地区花牛山群中变英安岩中获得LA-ICP-MS U-Pb年龄为（454.7±0.87）Ma（MSWD=0.28），属晚奥陶世早期的产物，该年龄可为准确厘定花牛山群的沉积时代提供新的依据，从而将其修订为上奥陶统。同时岩石地球化学具高碱、高铝，富集Rb、Th、U、K、Pb，亏损Nb、Ta、Ti，无明显δEu异常，显示出明显的火山弧岩浆特征。结合区域地质资料表明，岩体形成于活动大陆边缘，其形成与俯冲流体交代或俯冲沉积物的加入有关，与花牛山铅锌矿的喷流（气）沉积型块状硫化物矿床形成环境不同，因此，认为花牛山群并非花牛山铅锌矿的赋矿层位。Abstract: By using the zircon LA-ICP-MS U-Pb dating, the obtained ages of metamorphic dacite from Huaniushan Group are (454.7 ±0.87)Ma (MSWD=0.28), which belong to the early stage of Late Ordovician.This age can provide a new basis for accurately determining the depositional age of Hunshan Group, thus the age of Hunshan Group has been revised as Upper Ordovician.This metamorphic dacite have high alkali and high Al, obvious enrichment of Rb, Th, U, K, Pb, negative anomalies of Nb, Ta, Ti, no obvious δEu anomaly, showing the typical volcanic magma characteristics.According to the regional geological data, the metamorphic dacite is formed in the active continental margin,which is related to the addition of subduction fluid or subduction sediments and is different from the formation of massive sulfide deposits in the Huaniushan Pb-Zn deposit.Therefore, it is considered that the Huaniushan Group is not the ore-bearing strata of Huaniushan Pb-Zn deposit.
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Keywords:
- volcanic arc /
- ore-bearing strata /
- zircon U-Pb age /
- metamorphic dacite /
- Huaniushan Group /
- Beishan in Gansu
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代文军,龚全胜,李海林,等.甘肃北山南带中段志留系的发现及地质意义[J].西北地质,2002,35(3):42-47. DAI Wenjun,GONG Quansheng,LI Hailin,et al.Discovery of Silurian in middle section of south belt of Beishan mountain and its geological significance,Gansu[J].Northwestern Geology,2002,35(3):42-47.
龚全胜,刘明强,李海林,等.甘肃北山造山带类型及基本特征[J].西北地质,2002,35(3):28-34. GONG Quansheng,LIU Mingqiang,LI Hailin,et al.The type and basic characteristics of Beishan orogenic belt,Gansu[J].Northwestern Geology,2002,35(3):28-34.
何世平,任秉琛,姚文光,等.甘肃内蒙古北山地区构造单元划分[J].西北地质,2002,35(4):30-40. HE Shiping,REN Binchen,YAO Wenguang,et al.The division of tectonic units of Beishan area, Gansu-Inner Mongolia[J].Northwestern Geology,2002,35(4):30-40.
贺振宇,宗克清,姜洪颖,等.北山造山带南部早古生代构造演化:来自花岗岩的约束[J].岩石学报,2014,30(8):2324-2338. HE Zhenyu,ZONG Keqing,JIANG Hongyin,et al.Early Paleozoic tectonic evolution of the southern Beishan orogenic collage:Insights from the granitoids[J].Acta Petrologica Sinica,2014,30(8):2324-2338.
刘雪亚,王荃.中国西部北山造山带的大地构造及其演化[A].中国地质科学院地质研究所文集[C],1995,37-48. LIU Xueya,WANG Quan.Tectonics of orogenic belts in beishan mts.,western china and their evolution[A].CAGS[C[,1995,37-48.
聂凤军,江思宏,刘妍,等.甘肃花牛山东钾长花岗岩40Ar/39Ar同位素年龄及其地质意义[J].地质科学,2002b,37(4):415-422. NIE Fengjun,JIANG Sihong,LIU Yan,et al.40Ar/39Ar isotopic age dating on k-feldspar separates from eastern Haniushan granite, Gnsu province, and its geological significance[J].Scientia Geologica Sinica,2002b,37(4):415-422.
聂凤军,江恩宏,白天明,等.北山地区金属矿床成矿规律及找矿方向[M].北京:地质出版社,2002a. NIE Fengjun,JIANF Sihong,BAI Tianming,et al.Metallogenic studies and ore prospecting in the conjunction area of Inner Mongolia Autonomous Region, Gansu Province and Xinjiang Uygur Autonomous Region (Beishan Mt.),Northwest China[M].Beijing:Geological Publishing House,2002a.
杨合群,李英,赵国斌,等.北山蛇绿岩特征及构造属性[J].西北地质,2010,43(1):26-36. YANG Hequn,LI Ying,ZHAO Guobin,et al.Character and structural attribute of the Beishan ophiolite[J].Northwestern Geology,2010,43(1):26-36.
杨建国,翟金元,杨宏武,等.甘肃北山地区花牛山铅锌矿区玄武岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].地质通报,2010,29(7):1017-1023. YANG Jianguo,ZHAI Jinyuan,YANG Hongwu,et al.LA-ICP-MS zircon U-Pb dating of basalt and its geological significance in Huaniushan Pb-Zn deposit,Beishan area,Gansu,China[J].Geological Bulletin of China,2010,29(7):1017-1023.
杨建国.甘肃北山花牛山金银多金属矿田成矿规律与找矿预测[M].北京:地质出版社,2011. YANG Jianguo.Metallogenic studies and ore prospecting in Huaniushan gold and silver polymetallic ore field,Beishan,Gansu,China[M].Beijing:Geological Publishing House,2011.
殷勇,殷先明.花牛山地区中生代A型花岗岩特征及其找矿意义[J].甘肃地质,2010,19(1):6-14. YIN Yong,YIN Xianming.Features of mesozoic A-type granites and it's significancesfor prospecting in Huaniushan area[J].Gansu Geology,2010,19(1):6-14.
余吉远,王国强,李向民,等.北山地区花牛山群的重新厘定——来自火山岩地球化学证据[J].新疆地质,2015,33(4):537-543. YU Jiyuan,WANG Guoqiang,LI Xiangmin,et al.The redefinition of Huaniushan Group in Beishan area:geochemical evidence from volcanic rocks[J].Xinjiang Geology,2015,33(4):537-543.
张铭杰,吴茂炳.花牛山铅锌矿床成因的矿物学研究[J].甘肃地质,1998,7(2):93-98. ZHANG Mingjie,WU Maobing.a mineralogical study on the genesis of Huaniushan lead-zinc deposit[J].Gansu Geology,1998,7(2):93-98.
赵泽辉,郭召杰,王毅.甘肃北山柳园地区花岗岩类的年代学、地球化学特征及构造意义[J].岩石学报,2007,23(8):1847-1860. ZHAO Zehui,GUO Zhaojie,WANG Yi.Geochronology,geochemical characteristics and tectonic implications of the granitoids from Liuyuan area,Beishan,Gansu province,Northwest China[J].Acta Petrologica Sinica,2007,23(8):1847-1860.
朱江.北山造山带南带构造-岩浆建造与金多金属成矿[D].中国地质大学,2013. ZHU Jiang.Tectono-magmatic formation and gold-poly metallic mineralization in south Beishan Area,NW China[D].China University of Geosciences,2013.
左国朝,何国琦,李红诚.北山板块构造及成矿规律[M].北京:北京大学出版社,1990a. ZUO Guochao,HE Guoqi,LI Hongcheng.Plate tectonics and metallo ogenic regulaties in Beishan region[M].Beijing:Peking University Publication,1990a.
左国朝,刘义科,刘春燕.甘新蒙北山地区构造格局及演化[J].甘肃地质,2003,12(1):1-15. ZUO Guochao,LIU Yike,LIU Chunyan.Framework and evolution of the tectonic structure in beishan area across gansu province, xinjiang autonomous region and Inner Mongolia autonomous region[J].Gansu Geology,2003,12(1):1-15.
左国朝,张淑玲,何国琦,等.北山地区早古生代板块构造特征[J].地质科学,1990b,4:305-314. ZUO Guochao,ZHANG Shuling,HE Guoqi,et al.Early Paleozoic plate tectonics in Beishan Area[J].Chinese Journal of Geology,1990b,4:305-314.
CONDIE K C.Geochemical changes in baslts and andesites across the Archean-Proterozoic boundary:Identification and significance[J].Lithos,1989,23(1):1-18.
HOSKIN P W O,SCHALTEGGER U.The composition of zircon and igneous and metamorphic petrogenesis[J].Reviews in mineralogy and geochemistry,2003,53(1):27-62.
JAHN B,WINDLEY B,NATAL'IN B,et al.Phanerozoic continental growth in Central Asia[J].Journal of Asian Earth Sciences,2004,23(5):599-603.
SONG Dongfang,XIAO Wenjiao,HAN Chunming,et al.Progressive accretionary tectonics of the Beishan orogenic collage,southern Altaids:insights from zircon U-Pb and Hf isotopic data of high-grade complexes[J].Precambrian Research,2013a,227:368-388.
SONG Dongfang,XIAO Wenjiao,HAN Chunming,et al.Provenance of metasedimentary rocks from the Beishan orogenic collage,southern Altaids:constraints from detrital zircon U-Pb and Hf isotopic data[J].Gondwana Research,2013b,24(3):1127-1151.
TIAN Zhonghua,XIAO Wenjiao,WINDLEY B F,et al.Structure,age,and tectonic development of the Huoshishan-Niujuanzi ophiolitic mélange,Beishan,southernmost Altaids[J].Gondwana Research,2014,25(2):820-841.
WINCHESTER J A,FLOYD P A.Geochemical magma type discrimination:application to altered and metamorphosed basic igneous rocks[J].Earth & Planetary Science Letters,1976,28(3):459-469.
WINDLEY B F,ALEXEIEV D,Xiao Wenjiao,et al.Tectonic models for accretion of the Central Asian Orogenic Belt[J].Journal of the Geological Society,2007,164(1):31-47.
XIAO Wenjiao,WINDLEY B F,BADARCH G,et al.Palaeozoic accretionary and convergent tectonics of the southern Altaids:implications for the growth of Central Asia[J].Journal of the Geological Society,2004a,161(3):339-342.
XIAO Wenjiao,ZHANG Lianchang,QIN Kezhang,et al.Paleozoic accretionary and collisional tectonics of the Eastern Tianshan (China):implications for the continental growth of central Asia[J].American Journal of Science,2004b,304(4):370-395.
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