西藏冈底斯带叶巴组火山岩地球化学及成因

耿全如; 潘桂棠; 金振民; 王立全; 朱弟成; 廖忠礼

Volume 30 Issue 6

Jun. 2005

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Article Navigation > Earth Science > 2005 > 30(6): 747-760

GENG Quan-ru, PAN Gui-tang, JIN Zhen-min, WANG Li-quan, ZHU Di-cheng, LIAO Zhong-li, 2005. Geochemistry and Genesis of the Yeba Volcanic Rocks in the Gangdise Magmatic Arc, Tibet. Earth Science, 30(6): 747-760.

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Geochemistry and Genesis of the Yeba Volcanic Rocks in the Gangdise Magmatic Arc, Tibet

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, China

Received Date: 2005-08-23
Publish Date: 2005-11-25

Abstract

Abstract

The Early Jurassic Yeba bimodal volcanic rocks occur among Lhasa, Dazi and Mozhugongka, with major rocks of metabasalt, basaltic ignimbrite, dacite, silicic tuff and volcanic breccia. SiO₂ contents in lava rocks are 41%-50.4% and 64%-69%, belonging to calc-alkaline basalt and dacite. One notable feature of basalt is its low TiO₂ contents, 0.66%- 1.01%, much lower than those of continental tholeiite. The ∑REE contents of basalt and dacite are 60.3-135 μg/g and 126.4-167.9 μg/g respectively. Both rocks have similar REE and other trace element characteristics, with enriched LREE and LILE relative to HREE and HFS, similar REE plots and without Eu anomaly. The basalts have depleted Ti, Ta, Zr and Nb and slightly negative Nb and Ta anomalies, with Nb^*=0.54-1.17 and an average of 0.84. The dacites have depleted P and Ti and also slightly negative Nb and Ta anomalies, with Nb^*=0.74-1.06 and an average of 0.86.The ε_Nd(t), (⁸⁷Sr/⁸⁶Sr)_i values for basalts are 0.96-10.03 and 0.704 3-0.706 4. These values for dacites are (-1.42) -1.08 and 0.703 8- 0.704 9 respectively. Trace elemental and isotopic studies suggest that both basalt and dacite originated from partial melting of the mantle wedge at different degrees above subducted belt. The spinel lherzolite in upper mantle is likely the source rocks for the bimodal volcanic rocks, which might have undergone selective metasomasis of crustal fluids. Metamorphism at late stage made influence on the LILE contents. The Yeba bimodal volcanic rocks formed in temporal extensional environment in mature island arc settings, resulting from the Indosinian Gangdise magmatic arc.
- bimodal volcanic rock,
- geochemistry,
- origin,
- Gangdise magmatic arc,
- late Indosinian to early Yanshannian

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Geochemistry and Genesis of the Yeba Volcanic Rocks in the Gangdise Magmatic Arc, Tibet

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