The Forming Age and Geological Characteristics of the Metamorphic Intrusion of Hualong Rock Group in the Eastern Tectonic Belt of Nanshan,Qinghai
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摘要: 化隆岩群作为青海南山构造带的基底岩系，对其形成时代还存在较大争议。笔者通过对侵入于华隆岩群的片麻状花岗岩进行岩石学、年代学和岩石地球化学研究，显示岩石具高硅、富铝、贫钾、低磷和钛的特征，SiO2含量为69.48%，K2O含量为2.35%，K2O/Na2O值为0.59，（Na2O+K2O）值为6.27%，MgO含量为1.32%，Al2O3含量为13.68%，属中钾钙碱性过铝质系列。稀土元素含量较低，∑REE为253.77×10-6，岩石稀土元素配分曲线表现为轻稀土元素富集的右倾型，具中等程度的Eu负异常。微量元素显示富集大离子亲石元素Th、U、Ba，与相邻元素相比，明显亏损K、P、Ti元素，相对亏损Rb、Sr，具Zr、Hf正异常，具有A型花岗岩特征。片麻状花岗岩的形成时代为（701±63）Ma。结合地球化学特征及区域岩浆活动事件，认为化隆岩群片麻状花岗闪长岩形成于板内伸展环境，是罗迪尼亚超大陆裂解事件在祁连陆块中的岩浆活动响应。Abstract: Hualong rock group is the basement rock of Nanshan tectonic belt in Qinghai province.Its formation age remains controversial.This paperstudied the gneissic granodiorite, which intruded into Hualong rock group, through petrology, chronology and petrogeochemistry.The research shows that the rock has high SiO2 and Al2O3, and low K,P,Ti.The content of SiO2 is 69.48%, of K2O, 2.35%, of K2O/Na2O, 0.59,of (Na2O+K2O), 6.27%, of MgO, 1.32%, of Al2O3, 13.68%, belonging to mid-K calc-alkaline and prealuminous series.The content of rare earth elements is lower,∑REE being 253.77×10-6.The rock is enriched in LREE and depeleted in HREE.The REE patterns show rightward incline and moderate negative Eu anomaly.Compared with the adjacent elements,the trace elements show enrichment of LILE(Th,U,Ba),evident depletion of K,P,Ti, and relative depletion of Rb,Sr.Zr and Hf were positive anomaly.The rock has the characteristics of A-typegranite with the forming age of(701±63) Ma.Combined with the geochemical characteristics and regional magmatic activity events, it is held that the gneissic granodiorite was generated in an extensional environment, being the magmatic activity of the Rodinia supercontinent cracking event in Qilian block.
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Keywords:
- Hualong rock group /
- zircon U-Pb dating /
- geochemistry /
- gneissic granodiorite /
- Qilian block
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常宏,金章东,安芷生. 青海南山隆起的沉积证据及其对青海湖-共和盆地构造分异演化的指示[J].地质论评,2009,55(1):49-57. CHANG Hong,JIN Zhangdong,AN Zhisheng. Sedimentary Evidences of the Uplift of the Qinghai Nanshan(the Mountains South to Qinhai Lake) and Its Implication for structural Evolution of the Lake Qinhai-Gonghe Basin[J]. Geological Review,2009,55(1):49-57.
董国安,杨怀仁,杨宏仪,等.祁连地块前寒武纪基底锆石SHRIMP U-Pb年代学及其地质意义[J].科学通报,2007,52(13):1752-1585. DONG Guoan,YANG Huairen,YANG Hongyi,et al. SHRIMP U-Pb zircon dating and its geological implications of Precambrian basement of Qilian Block[J]. Chinese Science Bulletin,2007,52(13):1752-1585.
郭进京,张国伟,陆松年,等.中祁连地块东段元古宙基底地层格架讨论[J].中国区域地质,1999,18(4):379-382. GUO Jinjing,ZHANG Guowei,LU Songnian,et al. A discussion on the Proterozoic stratigraphy framework in the basement of eastern section of the Mid-Qilian Massif[J]. Regional Geology of China,1999,18(4):379-382.
何世平,李荣社,王超,等.祁连山西段甘肃肃北地区北大河岩群片麻状斜长角闪岩的形成时代[J].地质通报,2010,29(9):1275-1280. HE Shiping,LI Rongshe,WANG Chao,et al. Geochronology of gneissic plagioclase-amphibolite from Beidahe Group-complex in western segment of Qilian Mountains,China[J].Geological Bulletin of China,2010,29(9):1275-1280.
何世平,李荣社,王超,等.南祁连东段化隆岩群形成时代的进一步限定[J].岩石矿物学杂志,2011,30(1):34-44. HE Shiping,LI Rongshe,WANG Chao, et al. The further age constraint of Hualong Rock Group in the eastern segment of South Qilian Mountains[J]. Acta Petrologica et Mineralogica, 2011,30(1):34-44.
康伟浩,任二峰,高亮.青海南祁连东段化隆岩群时代重新厘定及地质意义[J].青海大学学报,2016,34(5):52-56. KANG Weihao,REN Erfeng,GAO Liang. The redefinition of the age of Hualong rock and geological significance in the eastern segment of the South Qilian Mountains in Qinghai[J]. Journal of Qinghai University, 2016,34(5):52-56.
李生虎,强晓农,田涛,等.青海南山东段花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义[J].地质通报,2018,37(7):1236-1245. LI Shenghu,QIANG Xiaonong,TIAN Tao,et al. LA-ICP-MS zircon U-Pb dating of the granites in the eastern section of Nanshan,Qinghai Province,and its geological significance[J]. Geological Bulletin of China,2018,37(7):1236-1245.
李昌年. 火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992,101-113. LI Changnian. Trace Elements in Igneous Petrology[M]. Wuhan:China University of Geosciences Press,1992,101-113.
陆松年,李怀坤,王惠初,等.秦-祁-昆造山带元古宙副变质岩层碎屑锆石年龄谱研究[J].岩石学报,2009,25(9):2195-2208. LU Songnian,LI Huaikun,WANG Huichu,et al. Detrital zircon population of Proterozoic meta-sedimentary strata in the Qinling-Qilian-Kunlun Orogen[J].Acta Petrologica Sinica, 2009,25(9):2195-2208.
陆松年,郝国杰,相振群.前寒武纪重大地质事件[J].地学前缘,2016,23(6):140-155. LU Songnian,HAO Guojie,XIANG Zhenqun. Precambrian major geological events[J].Earth Science Frontiers,2016,23(6):140-155.
邱成贵,李志斌. 南祁连化隆岩群形成时代的新证据[J].西部资源,2016,(06):8-9. QIU Chenggui,LI Zhibin. The new evidence of the forming time about the Hualong Rock in South-Qilian[J]. Western Resources, 2016,(06):8-9.
苏建平,胡能高,张海峰,等.北祁连西段吊大坂花岗片麻岩的锆石U-Pb年龄及地质意义[J].地质科技情报,2004,23(3):11-14. SU Jianping,HU Nenggao,ZHANG Haifeng,et al. Single-zircon U-Pb dating and geological significance of the Diaodaban granitic gneiss in the western segment of North Qilian Mountains[J]. Geological Science and Technology Information,2004,23(3):11-14.
田淇,石玉莲,郝亚青,等.青海南山俯冲型侵入体LA-ICP-MS锆石U-Pb定年及其地质意义[J].地质通报,2018,37(7):1258-1270. TIAN Qi,SHI Yulian,HAO Yaqing,et al. LA-ICP-MS zircon U-Pb dating of Nanshan sudduction type intrusion in Qinghai Province and its geological significance[J]. Geological Bulletin of China,2018,37(7):1258-1270.
徐学义,王洪亮,陈隽璐,等.中祁连东段兴隆山群基性火山岩锆石U-Pb定年及岩石成因研究[J].岩石学报,2008,24(4)827-840. XU Xueyi,WANG Hongliang,CHEN Junlu,et al. Aircon U-Pb dating and petrogenesis of Xinglongshan Group basic volcanic rocks at eastern segment of Middle Qilian Mts[J]. Acta Petrologica Sinica,24(4)827-840.
徐旺春,张宏飞,柳小明.锆石U-Pb定年限制祁连山高级变质岩系的形成时代及其构造意义[J].科学通报,2007,52(10):1174-1180. XU Wangchun,ZHANG Hongfei,LIU Xiaoming. U-Pb zircon dating constraints on formation time of Qilian high-grade metamorphic rock and its tectonic implications[J]. Chinese Science Bulletin,2007,52(10):1174-1180.
雍拥,肖文交,袁超,等.中祁连东段花岗岩LA-ICPMS锆石U-Pb年龄及地质意义[J].新疆地质,2008,26(1):62-70. YONG Yong,XIAO Wenjiao,YUAN Chao,et al. LA-ICPMS zircon U-Pb ages of granitic plutons from the eastern of the Central Qilian and their geologic implication[J].Xinjiang Geology,2008,26(1):62-70.
余吉远,李向民,马中平,等.南祁连化隆岩群LA-ICP-MS锆石U-Pb年龄及其地质意义[J].西北地质,2012,45(1):79-85. YU Jiyuan,LI Xianmin,MA Zhongping,et al. The LA-ICP-MS U-Pb Age and Geological Significance of Hualong Rock Group in South Qilian Mountains[J]. Northwestern Geology, 2012,45(1):79-85.
万渝生,许志琴,杨经绥,等.祁连造山带及邻区前寒武纪深变质基底的时代和组成[J].地球科学,2003,24(4):319-324. WAN Yusheng,XU Zhiqin,YANG Jingsui,et al. The Precambrian High-grade Basement of the Qilian Terrane and Neighboring Areas:Its Ages and Compositions[J].Acta Geoscientia Sinica,2003,24(4):319-324.
吴福元,李献华,杨进辉,等. 花岗岩成因研究的若干问题[J]. 岩石学报,2007,23(6):1217-1238. WU Fuyuan,LI Xianhua,YANG Jinhui, et al. Discussions on the Petrogenesis of graniets[J]. Acta Petrologica Sinica,23(6):1217-1238.
夏林圻,李向民,余吉远,等.祁连山新元古代中-晚期至早古生代火山作用于构造岩化[J].中国地质,2016,43(04):1087-1138. XIA Linqi,LI Xiangmin,YU Jiyuan,et al. Mid-Late Neoproterozoic to Early Paleozoic volcanism and tectonic evolution of the Qilian Mountain[J]. Chinese Geology,2016,(4):1087-1138.
张国伟,郭安林,姚安平. 中国大陆构造中的西秦岭-松潘大陆构造结[J].地学前缘,2004,(3):23-32. ZHANG Guowei,GUO Anlin,YAO Anping.Western Qinling-Songpan continental tectonic node in China's continental tectonics[J]. Earth Science Frontiers,2004,(3):23-32.
曾建元,杨宏仪,万渝生,等.北祁连山变质杂岩中新元古代(~775Ma)岩浆活动记录的发现:来自SHRIMP锆石U-Pb年龄及地质意义[J].科学通报,2006,51(5):575-581. ZENG Jianyuan,YANG Hongyi,WAN Yusheng, et al. The discovery of neoproterozoic magmatic activity records of the metamorphic complex in North-Qilian and their geological implication:from SHRIMP zircon U-Pb Age[J]. Chinese Science Bulletin, 2006,51(5):575-581.
张永明,裴先治,李佐臣,等.青海南山当家寺花岗岩体锆石U-Pb年代学、地球化学及其地质意义[J]. 地质学报,2017,91(3):523-541. ZHANG Yongming,PEI Xianzhi,LI Zuochen, et al. LA-ICP-MS Zircon U-Pb Dating and Geochemistry of the Dangjiasi Granitic Complex in the Qinghai Nanshan Tectonic Zone,and Its Geological Implications[J]. Acta Geologica Sinica,2017,91(3):523-541.
张永明,裴先治,李佐臣,等.青海南山沟后岩浆杂岩体锆石U-Pb年代学、岩石成因及其地质意义[J]. 大地构造与成矿学,2017,41(5):908-932. ZHANG Yongming,PEI Xianzhi,LI Zuochen, et al. LA-ICP-MS Zircon U-Pb Dating,Petrogensis of the Gouhou Complex in the Qinghai Nanshan Tectonic Zone,and its Geological Implications[J]. Geotectonica et Metallogenia,2017,41(5):908-932.
张永明,裴先治,李佐臣,等.青海南山构造带西段黑马河花岗杂岩体锆石U-Pb年代学、地球化学特征及其地质意义[J]. 地质论评,2017,63(4):1079-1101. ZHANG Yongming,PEI Xianzhi,LI Zuochen,et al. LA-ICP-MS Zircon U-Pb Dating,Geochemistry and Its Geological Significance of the Heimahe Granitic Plutou in the Western Segment of the Qinghai'nanshan Tectonic Belt[J]. Geological Review,2017,63(4):1079-1101.
Belousova E,Griffin W,O'Reilly S Y,et al. Igenous zircon:trace element composition as an indicator of source rock type[J]. Conttibutions to Mineralogy&Petrology,2002,143(5):602-622.
Chappell B W, White A J R. I. S-type granites in the Lachlan Fold Belt[J]. Transactions of the Royal Society of Edinburgh:Earth Sciences,1992,3(1-2):1-26.
Champion D C, Bultitude R J. The geochemical and Sr-Nd isotopic characteristics of Paleozoic fractionated S-types granites of North Queensland:Implications for S-type granite petrogenesis[J].Lithos,2013,162-163:37-56.
Abdullah Kaygusuz,Wolfgang Siebel,Cuneyt Sen, et al. Petrochemistry and petrology of I-type granitoids in an arc setting:the composite Torul pluton,Eastern Pontides,NE Turkey[J]. International Journal of Earth Sciences,2008,97(4):739-764.
Rapp R P, Waston E B. Dehydration melting of meta basalt at 8~32 kbar implications for continental growth and crust-mantle recycling[J]. Journal of Petrology,1995, 36(4):891-931.
Sun S S,McDonough W F. Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and procession.In:Sunders A D,Norry M J,eds.Magmatism in the Ocean Basins[J].London:Geo.Soc.Spec.Publ, 1989,42:313-345.
Wan Y S, Yang J S,Xu Z Q, et al. Geochemical characteristics of the Maxianshan complex and Xinglongshan group in the eastern segment of the Qilian orogenic belt[J].J Geol Soc China,2000,43(1):52-68.
Wan Y S,Zhang J C,Yang J S, et al. Geochemistry of high-grademetam orphic rocks of the North Qaidam Mountains and their geological significance[J].J Asian Earth Sci, 2006,28:174-184.
Zhao Zhenhua,Xiong Xiaolin,Wang Qiang, et al. Some aspects on geochemistry of Nb and Ta[J].Geochimica,2008,37(4):304-320.
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