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Discovery of the Ordovician and its basal conglomerate in the Kangmar area, southern Tibet-with a discussion of the relationof the sedimentary cover and unifying basement in the Himalayas

ZHOU Zhiguang, LIU Wencan, LIANG Dingyi(School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China)  
In southern Tibet, Ordovician and its basal conglomerate cover the pre-Ordovician Lhagoi Kangri Group on the southwest side of the Kangmar rock body in the Lhagoi Kangri belt of the North Himalaya, the latter is intruded by the 515-485 Ma old granite of the Lhagoi Kangri structural dome and again by the latest-stage basic dike of the Pan-African movement along an unconformity between the Ordovician and pre-Ordovician. This extensional unconformity may well correlate with the related section in the Himalayas and even the Gangdise belt and is just the boundary between the unifying basement on the northern margin of the supercontinent Gondwana and sedimentary cover. The unifying basement of Gondwana began to form in the "Pan-African movement" at the end of the Sinian, and the time of formation may have continued to the turning between the Cambrian and Ordovician in the Himalaya and to its north, which is manifested by the tectonic environment of regional continuous extension and breakup. Therefore, the extensional movement is also one of the mechanisms for controlling formation of the unifying metamorphic basement and sedimentary cover.
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