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Discovery of eclogite and its geological significance in Qiangtang area, central Tibet

Science Bulletin 2006年第9期51卷 1095-1100页

作者： li cai1, zhai qingguo2, dong yongsheng1 & huang xiaopeng11. college of earth sciences, jilin university, changchun 130061, china 2. Institute of Geology, Chinese Academy of Geological sciences, Bei- jing 100037, china college of earth sciences Jilin University Changchun 130061 China Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China

Eclogite is first discovered from Qiang- tang area, central Tibet, which occurs as a lens in the high-pressure metamorphic belt comprising glauco- phane-muscovite schist and garnet-muscovite schist, along the south margin of Lungmu Co-Shuanghu Paleo-Tethys suture. A glaucophane 40Ar/39Ar age of 220 Ma and a phengite 40Ar/39Ar age of 221.9 Ma have been obtained from blueschists associated with eclogite. The rock consists of garnet, omphacite, amphibole, phengite, and rutile, etc, and the jadeite content in omphacite ranges from 32.7% to 38.95%. It is estimated that the temperature of the eclogite is 1.56― 2.35 GPa. The discovery of Qiangtang ecologite fur- ther supports that there is a suture zone of Indo- Chinese epoch in central Qiangtang area, and is very important for discssing the evolution of the pa- leo-ocean and paleo-plate tectonics in this area.

关键词： Qianghai-Tibet Plateau Qiangtang eclogite tectonics.

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The fragment of Paleo-Tethys ophiolite from central Qiangtang, Tibet:Geochemical evidence of meta-basites in Guoganjianian

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Science china earth sciences 2007年第9期50卷 1302-1309页

作者： zhai qingguo1,2, li cai2 & huang xiaopeng2 1 Institute of Geology, Chinese Academy of Geological sciences, Beijing 100037, china 2 college of earth sciences, jilin university, changchun 130061, china 1. Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 China 2. college of earth sciences Jilin University Changchun 130061 China

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.

关键词： Qiangtang, metabasite, Paleo-Tethys, ophiolite

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