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《Acta Geologica Sinica》 1999-04
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The Blueschist Belt in the Shuanghu Region, Central-Northern Tibet and Its Tectonic Implications

Bao Peisheng, Xiao Xuchang, Wang Jun(Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037))Li Cai and Hu Ke(Academy of Earth Sciences, Changchun University of Science and Technology, 1 30061)  
The blueschist blocks extend discontinuously over 300 km in central-northern Tibet from the Qiagelela town, 13 km west of Shuanghu, Xiyaergang, in the east Tibet, through Nare, Gacuo, Jiaomuri, Gangtangcuo, Guoganjianian Mt. , Mayigangri to Gangmacuo-Longmucuo in the west. The blueschists are newly-discovered by Li Cai et al. in recenr years, except those in Qiagelela and Guogan-jianian Mt. There are also some associated "Ophiolite melanges".The protoliths of the blueschist are mainly of the Late Carboniferous rifted sedimentary-volcanic rock series at the northern margin of the Gondwana land, including basic volcanic rocks (or pyroclastic rocks), argillaceous sandstone, argillaceous limestone etc. , and minor basic lampro-phy.The high pressure-low temperature minerals mainly consist of crossite, secondly of magne-sio-riebeckite, with minor winchite. The estimated metamorphic pressure of the blueschist varies from 0. 67-0. 75 GPa and the metamorphic temperature from 410-460c corresponding to the transitional facies between blueschist and green schist.The typical mineral assemblages are as follows; (1) epidote+chlorite+crossite+albite; (2) sericite+chlorite+magnesio-riebeckite (±winchite) + feldspar + quartz ; (3) calcite+crossite + epidote; and (4) chlorite + actinolite+winchite (iclinopyroxene relict).The 40Ar/39Ar isotope age of crossite is 222. 5± 3. 7 Ma, revealing its metamorphic age as between the Late Paleozoic and the Early Mesozoic.The high-pressure metamorphic zone, with its associated "ophiolite melange", may very well be a geologic record from its divergence to convergence and consumption of a rift trough or "initial limited oceanic basin" within the marginal sea at the northern margin of the Gondwana land. It is reasonable to take the Longmucuo-Gangmacuo-Shuanghu-Dengqen Lancang River belt as a boundary between the Gondwana land and the Eurasian land.
【Fund】: 地质矿产部“八五”重点基础研究项目;; 地质矿产部“九五”重点基础研究项目(编号850220和950110)的部分成果
【CateGory Index】: P588.1
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