哀牢山蛇绿岩带两种玄武岩的成因探讨

The Genesis of Pyroxene Basalts and Plagioclase Basalts in the Ailaoshan Ophiolite Zone,Yunnan

哀牢山蛇绿岩带位于横断山脉南缘,东临扬子地块,西接太忠-李仙江弧火山岩带(图1),是我国乃至世界上著名的蛇绿岩带。自段新华等(1981)报道了该蛇绿岩带以来,不少学者在此做过卓有成效的工作。但目前对该蛇绿岩带中两种玄武岩即辉石玄武岩和斜长玄武岩的成因机制尚缺乏系统...

The approaches on the genetic mechanisms of pyroxene basalts and plagioclase basalts in the Ailaoshan ophiolite zone,Yunnan have been made on the basis of the theory of partial melting and fractional crystallization.The pyroxene basaltic magma is interpreted as the primitive magma which originated from 11 percent melting of plagioclase lherzolite (primitive pyrolite).The plagioclase basaltic magma is believed to be the residual magma which resulted from 44 percent fractional crystallization of clinopyroxene from the pyroxene basaltic magma(primitive magma).