摘要
分布于各拉丹冬一带的晚三叠世火山岩 ,被中侏罗统雀莫错组角度不整合覆盖 ,早白垩世各拉丹冬超单元侵入其中。岩性主要为由玄武岩、安山岩、流纹岩、凝灰岩等组成的一套基性—中性—酸性岩石组合。岩石化学、稀土和微量元素地球化学研究表明 ,它们为钙碱性岩系 ,又具有橄榄玄粗岩系的一些特征 。
The late Triassic volcanic rocks distributed in the source region (Geladandong) of the Yangtze River, unconformably overlaid by the middle Jurassic Quemocuo Formation and intruded by early Cretaceous Geladandong granite Superunit, comprises basic intermediate acid rock series, including basalt, andesite, rhyolite and tuff. Lithochemistry, rare earth element(REE) and microelement geochemistry show that the calc alkaline volcanic rocks was formed in a island arc belt with the characteristics of absarokite.
出处
《华南地质与矿产》
CAS
2001年第3期9-13,共5页
Geology and Mineral Resources of South China
基金
中国地质调查局 1:2 5万赤布张错幅项目 ( 2 0 0 0 130 0 0 135 )
