摘要
本文对中甸东部晚三叠世图姆沟组深水浊积岩和弧火山岩、微量和稀土元素进行研究,投点多落入再旋回造山带物源区;微量和稀土元素与图解中多接近大陆岛弧区;常量元素分析与相关图解接近活动大陆边缘和大陆岛弧环境,与火山岩的大地构造环境具有相同的结论。图姆沟组为甘孜—理塘洋盆向西俯冲消减,中甸褶皱带东缘由被动大陆边缘转化为活动大陆边缘过程中形成的岛弧火山—沉积岩系。
In this paper, we have a study on the trace element and REE of the Late Triassic Tumugou Formation deep water turbidite and arc volcanic rock in Eastern Zhongdian with the mineral composition statistics of Dickinson(1983). According to the statistics of mineral composition of 40 samples of sandstone, the plotted points are within the area of recycled orogen. The characteristics of trace element and REE are close to the continental island arc area in diagram. According to the characteristics and the related diagram of major element, they are close to the active continental margin and island arc environment, which are same as the tectonic environment of volcanic rock. The Tumugou Formation is an island arc volcanic-sedimentary rock series formed in the transition process from a passive continental margin to an active continental margin of the eastern margin of Zhongdian fold zone.
出处
《云南地质》
2005年第2期186-192,共7页
Yunnan Geology
关键词
岩石化学
构造环境
图姆沟组砂岩
中甸云南
Petrochemistry
Tumugou Formation Sandstone
Tectonic Environment
Zhongdian,Yunnan
