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四川盆地威远构造基底花岗岩地球化学特征及其构造环境-谷志东.pdf

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四川盆地威远构造基底花岗岩地球化学特征及其构造环境-谷志东.pdf

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文档介绍:: .
뗚␦ 뻭 퓶뾯⌀ r. 117 A2 ,
用形成 推断该花岗岩类发育于晋宁运动后澄江期由伸展到裂谷的构造环境
, .
关键词 四川盆地 威远构造 基底花岗岩 地球化学 构造环境
: ; ; ; ; .
中图分类号 文章编号 收稿日期
:P596     :1000-2383(2013)S1-0031-12     :2012-11-12
Geochemical Characteristics and Tectonic Environment of
Basal Granite in Weiyuan Structure,Sichuan Basin
GU Zhi-dong1,ZHAI Xiu-fen1,JIANG Xing-fu2,HUANG Ping-hui 3,QIAN Hong-ying2,QIAO Lin2
1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China
2.Exploration Utility Department of Southwest Oil and Gas Company,PetroChina,Chengdu 610041,China
3.Exploration Department of Southwest Oil and Gas Company,PetroChina,Chengdu 610051,China
Abstract:The deep wells drilled into the basement in Weiyuan structure in Sichuan basin,and aeromagnetic negative anomalies
confirm that the basement is composed of granitoids.The genetic types of granites,the sources of the magma and their original
tectonic settings are discussed in light of detailed analysis of petrology and geochemistry of basal granites in W117well in this
paper.Well core observation and thin section identification results show that syenogranite is the main rock type,with an up-
ward-coarsening rhythm.The features of major elements include high Si content,high alkali value,high K2O/Na2O ratio,high
K content but low Na content,suggesting that it belongs to high-K calc-alkaline and metaluminous-weakly peraluminous series.
The LREE is rich,with HREE loss and intensely negative Eu abnormality,while the chondrite