地质通报2016，Vol.35Issue(8)：1346-1356,11.
滇西盈江地区上新世双峰式火山岩的地球化学特征及其构造意义
Geochemical evidence of the Pliocene bimodel volcanic rocks in Yingjiang area of western Yunnan Province and its tectonic significance
摘要
Abstract
The Pliocene volcanic rocks in Yingjiang area constitute an important part of Tengchong volcanic rocks, but they are rare⁃ly involved in previous studies. In this paper, through the study of petrochemistry and K-Ar geochronology of the volcanic rocks and a comparison with the eastern Tengchong Pliocene volcanic rocks in the Longjiang River Valley area, the authors consider that the Pliocene volcanic rocks in Yingjiang and Tengchong areas seem to be a kind of rift volcanic rocks of the post-tectonic orogenic belt formed under the effect of extension that appeared in the continental tectonic background. With high Al 2O3 (15.54%~17.44%) and high K2O (0.94%~3.50%) petrochemical characteristics, the rocks should belong to high potassium calc-alkaline volcanic rock series. They formed in an extensional environment and belong to bimodel volcanic rocks (basalt DI=33~50, dacite DI=62~76). The rocks have the geochemical characteristics of arc volcanic rocks, but they formed in a tensional environment in post-tectonic orogenic belt and had nothing to do with the plate subduction. The rift volcanic rocks of orogenic belts formed in the early orogenic belt and hence were magmatic products in the process of the development of the orogenic belt at a certain stage.关键词
上新世/火山岩/高钾钙碱性/双峰式/造山带裂谷/腾冲地块/盈江Key words
Pliocene/volcanic rocks/high potassium calc-alkaline/bimodel/rift of orogenic belts/Tengchong block/Yingjiang分类
天文与地球科学引用本文复制引用
姚雪,张虎,吴中海,陈光艳,田素梅,黄亮..滇西盈江地区上新世双峰式火山岩的地球化学特征及其构造意义[J].地质通报,2016,35(8):1346-1356,11.基金项目
中国地质科学院地质力学研究所项目（编号:1212011120166）和中国地质调查局项目 （）
