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《Geochimica》 2009-03
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Geochemical characteristics and petrogenesis of volcanic rocks since the Neogene in the Bayankala and east Kunlun region, northern Tibetan plateau

ZHAO Zhen ming1 , JI Wen hua1, LI Rong she1, MA Hua dong2,3, YANG Zi jiang2, WANG Bing zhang4,ZHU Ying tang4,5, WANG Guo can6, BAI Dao yuan7, ZHANG Zhen fu8,9 and LI Dun peng10,111.Xi‘an Institute of Geology and Mineral Resources, Xi‘an 710054, China; 2.Xinjiang Institute of Geological Survey, ürü mqi 830011, China; 3.National 305 Project Office, Xinjiang Uygur Autonomous Region, ürümqi 830000, China; 4.Qinghai Institute of Geological Survey, Xining 810012, China; 5.Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China; 6.Faculty of Earth Science, China University of Geosciences, Wuhan 430074, China; 7.Hunan Institute of Geology Survey, Xiangtan 411100, China; 8.Shanxi Institute of Geological Survey, Taiyuan 030001, China; 9.Northwest Geological Exploration Institute, China Metallurgical Geology Bureau, Xi‘an 710061, China; 10.Shaanxi Institute of Geological Survey, Xi‘an 710016, China; 11.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China  
The Cenozoic volcanic rocks in the Bayankala and east Kunlun region, northern Tibetan plateau, have been formed in the Miocene, Pliocene and Pleistocene. There are 8 rock types all together, ranging from tephrite, basaltic trachyandesite, trachyandesite (latite), trachyte, trachydacite,to rhyolite-porphyry and rhyolite. The distribution of volcanic rocks is closely associated with regional faults, contacted the underlying stratum with angular unconformity. These rocks belong to calc-alkaline, high-K and shoshonite series according to geochemical data. The study region can be classified into three parts according to ages and distributions of Cenozoic volcanic rocks. (1) Hoh Xil-Jingyu lake section, centered at the north margin of the Hoh Xil lake and gets younger outwards; (2) Muzitage-Yinshi mountain section, centered at south-west Yinshi mountain and gets younger outwards; (3) Heishibei lake section. Volcanic rocks in these three sections become younger from east to west, with decreasing intensities and area. The trace element patterns show arc signature with K, Rb, Ba, Th and LREE enrichment, and HFSE (Nb,Ta,Ti) depletion. Most rocks have weak δ Eu negative anomaly (0.61- 0.95) except rhyolite-porphyry and rhyolite with strong δ Eu negative anomaly (0.04- 0.39), Volcanic rocks in the study region change gradually from acidic to basic with decreasing average Na2O and K2O and increasing TiO2, Al2O3, TotalFe, MnO, MgO, CaO, P2O5,δ Sr, Sr/Y, ∑ REE,δ Eu, La/Yb from east to west. MgO content of the same kind of volcanic rocks decreases with age. Some volcanic rocks were originated from enriched-mantle source (EMⅡ ) as indicated by Sr and Nd isotopic compositions. Xenoliths came from deep and shallow places. These volcanic rocks formed in intracontinental environment, probably during the uplift of the Tibetan plateau since the Miocene, genetically related to lithosphere thinning and intracontinental subduction.
【Fund】: 中国地质调查局“青藏高原北部空白区基础地质综合研究”项目(编号:200313000010 1212010510110);; “青藏高原北部空白区基础地质调查与研究”项目(编号:1212010310101);; “青藏高原前寒武纪地质古生代构造-古地理综合研究”项目(编号:1212010610102)
【CateGory Index】: P588.14
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