藏南曲卓木地区酸性火山岩地球化学、Hf-Sr-Nd同位素特征及其成因

董随亮; 张志; 张林奎; 李光明; 卿成实; 梁维; 付健刚; 曹华文; 李海平; 许昌辉; 李智鹏

doi:10.3799/dqkx.2018.165

Volume 43 Issue 8

Aug. 2018

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Article Navigation > Earth Science > 2018 > 43(8): 2701-2714

Dong Suiliang, Zhang Zhi, Zhang Linkui, Li Guangming, Qing Chengshi, Liang Wei, Fu Jiangang, Cao Huawen, Li Haiping, Xu Changhui, Li Zhipeng, 2018. Geochemistry, Hf-Sr-Nd Isotopes and Petrogenesis of Acidic Volcanic Rocks in Quzhuomu Region of Southern Tibet. Earth Science, 43(8): 2701-2714. doi: 10.3799/dqkx.2018.165

Citation:

Dong Suiliang, Zhang Zhi, Zhang Linkui, Li Guangming, Qing Chengshi, Liang Wei, Fu Jiangang, Cao Huawen, Li Haiping, Xu Changhui, Li Zhipeng, 2018. Geochemistry, Hf-Sr-Nd Isotopes and Petrogenesis of Acidic Volcanic Rocks in Quzhuomu Region of Southern Tibet. Earth Science, 43(8): 2701-2714. doi: 10.3799/dqkx.2018.165

Citation:

Dong Suiliang, Zhang Zhi, Zhang Linkui, Li Guangming, Qing Chengshi, Liang Wei, Fu Jiangang, Cao Huawen, Li Haiping, Xu Changhui, Li Zhipeng, 2018. Geochemistry, Hf-Sr-Nd Isotopes and Petrogenesis of Acidic Volcanic Rocks in Quzhuomu Region of Southern Tibet. Earth Science, 43(8): 2701-2714. doi: 10.3799/dqkx.2018.165

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Geochemistry, Hf-Sr-Nd Isotopes and Petrogenesis of Acidic Volcanic Rocks in Quzhuomu Region of Southern Tibet

doi: 10.3799/dqkx.2018.165

1.
Chengdu Center of China Geological Survey, Chengdu 610081, China
2.
Sichuan Bureau of Geology and Mineral Resources of 109 Geological Team, Chengdu 610100, China

Received Date: 2018-03-15
Publish Date: 2018-08-15

Abstract

Abstract

There are few related studies on the Cretaceous acid rocks currently, and this paper focuses on a wide range of acid (dyanite)-basic (diabase-basalt) volcanic magmatism recently discovered in the Quzhuomu area where bimodal volcanic magmatic activity is obvious.Geochronology, geochemistry and Hf-Sr-Nd isotope analyses are carried out on these dacites.The results show that the diagenetic age of dacite is 142.0±2.5 Ma.The dacites show high contents of LREE and high field-strength elements (etc. Nb, Zr, Hf, Y) and high ratios of Ga/Al, indicating the characteristics of A-type granite.ε_Hf(t) values of zircons range from -13.1 to -2.4, with an average of -7.1.The dacites also show high initial Sr isotope contents (⁸⁷Sr/⁸⁶Sr ratios of 0.722 024 to 0.722 698) and low initial Nd isotope contents with ε_Nd(t) values from -12.2 to -11.8).The comprehensive research indicates that the acid volcanic rocks of Quzhuomu region are the products of the continental crust anataxis under extension setting.These dacites show the similar geochemical characteristics and diagenetic age with the Sangxiu formation acid volcanic rocks, Laguila acid intrusive rocks and rhyolites of Sangrize region.They are probably all the products of the Comei-Bunbury large igneous province, which are the products of the early magmatic activity of Kerguelen mantle plume.The magma activities of Kerguelen mantle plume may be advanced to 140 Ma.
- large igneous province,
- Tethys Himalaya,
- bimodal volcanic rocks,
- southern Tibet,
- zircon U-Pb dating,
- geochemistry,
- geochronology

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References(58)

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Geochemistry, Hf-Sr-Nd Isotopes and Petrogenesis of Acidic Volcanic Rocks in Quzhuomu Region of Southern Tibet

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