腾冲火山岩矿物化学研究

MINERAL CHEMISTRY OF THE VOLCANIC ROCKS IN TENGCHONG,CHINA

通过电子探针分析 ,系统研究了腾冲火山岩 10 5个造岩矿物的化学成分。研究表明 :本区熔岩中的橄榄石为贵橄榄石兼少量透铁橄榄石 ,斜方辉石为古铜辉石兼紫苏辉石 ,单斜辉石为普通辉石兼少量镁质透辉石 ,斜长石为拉长石兼部分中长石和少量更长石 ,角闪石为低铁韭闪质普通角闪石 ,黑云母为钛铁黑云母兼富铁黑云母。

In this paper, the chemical compositions of 105 rock-forming minerals of the volcanic rocks in Tengchong have been determined by the microprobe and systematically studied. This indicates that in the lavas chrysolites predominate, together with a few hyalosiderites; for the orthopyroxenes, bronzites predominate, together with a few hypersthenes; for the clinopyroxenes, augites predominate, together with a few enstatite diopsides; labraclorites and part andesines predominate, together with a few oligoclases; the hornblendes are the ferrian pargasitic ones and the biotites both titano-ferrobiotites and ferrobiotites