%0 Journal Article
%T Petrogenesis of the Cenozoic volcanic rocks from the northern part of the Qinghai-Tibet Plateau<br>青藏高原北部新生代火山岩的成因机制
%A Lai Shaocong
%A <br>赖绍聪
%J 岩石学报
%D 1999
%I 
%X Based on the electron probe analyses result of the minerals and the bulk rock composition of the Cenozoic volcanic rocks from Yumen and Hoh Xil lithodistricts on the Qinghai-Tibet Plateau, the forming conditions including temperature and pressure of those rocks are studied.According to the thermodynamics calculation result of the mineral-melt equilibrium,the depth of the asthenosphere superface (about 75～130km) for the northern part of the Qinghai-Tibet Plateau during Cenozoic era is suggested. Finally, this paper indicates that the Cenozoic volcanic rocks in the northern part of the Qinghai-Tibet Plateau mainly consist of shoshonite series.Their forming temperature is 630～1039℃ and forming pressure is between 2.3～4.0 GPa and formed in the intracontinental orogenic belt,where the primary magma was originated from a particular enriched upmantle and accreted crust-mantle belt or directly originated from asthenosphere superface by partial melting of pyrolite.
%K 青藏高原
%K 新生代
%K 火山岩
%K 岩石成因
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=D535E6A9FE2A133E&yid=B914830F5B1D1078&vid=23CCDDCD68FFCC2F&iid=CA4FD0336C81A37A&sid=10F298ED9F164662&eid=DBF54A8E2A721A6D&journal_id=1000-0569&journal_name=岩石学报&referenced_num=19&reference_num=0