| The fragment of Paleo-Tethys ophiolite from central Qiangtang, Tibet:Geochemical evidence of meta-basites in Guoganjianian |
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| 作者单位： | ZHAI QingGuo（Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;College of Earth Sciences, Jilin University, Changchun 130061, China） ;
LI Cai（College of Earth Sciences, Jilin University, Changchun 130061, China） ;
HUANG XiaoPeng（College of Earth Sciences, Jilin University, Changchun 130061, China） ; |
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| 基金项目： | 中国地质调查局资助项目 |
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| 摘 要： | N-MORB-type metabasites are discovered in the Guoganjianian area, central Qiangtang, Tibet, which are mainly metagabbro with cumulate structure and metabasalt. The rocks are distributed nearly from west to east unconformably underlying the Wanghuling Group of upper Triassic. On the basis of geo- chemical analysis, we find that the content of SiO2 is 43.03%―53.42%, and TiO2 1%―2.67%, Al2O3 16.75%―21.52%, CaO 7.03%―11.13%, K2O 0.05%―0.38%; the REE pattern is slight depletion or flat, and the trace spider diagram is like that of N-MORB, so we consider that the metabasite was formed under the setting of mid-ocean ridge or adult back-arc basin, and it is the fragment of Paleo-Tethys ophiolite.
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| 收稿时间： | 22 May 2006 |
| 修稿时间： | 11 September 2006 |
The fragment of Paleo-Tethys ophiolite from central Qiangtang,Tibet: Geochemical evidence of metabasites in Guoganjianian |
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| Authors: | Zhai QingGuo Li Cai Huang XiaoPeng |
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| Institution: | 1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;College of Earth Sciences, Jilin University, Changchun 130061, China
2. College of Earth Sciences, Jilin University, Changchun 130061, China |
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| Abstract: | N-MORB-type metabsites are discovered in the Guoganjianian area, central Qiangtang, Tibet, which are mainly metagabbro with
cumulate structure and metabasalt. The rocks are distributed nearly from west to east unconformably underlying the Wanghuling
Group of upper Triassic. On the basis of geochemical analysis, we find that the content of SiO2 is 43.03%–53.42%, and TiO2 1%–2.67%, Al2O3 16.75%–21.52%, CaO 7.03%–11.13%, K2O 0.05%–0.38%; the REE pattern is slight depletion or flat, and the trace spider diagram is like that of N-MORB, so we consider
that the metabasite was formed under the setting of mid-ocean ridge or adult back-arc basin, and it is the fragment of Paleo-Tethys
ophiolite.
Supported by China Geological Survey (Grant Nos. 200313000054, 20031300015 and 1212010561605) |
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| Keywords: | Qiangtang metabasite Paleo-Tethys ophiolite |
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