滇西地区中酸性侵入岩的平均化学成分

Average Chemical Compositions of the Inter mediate-Acid Intrusive Rocks of Western Yunnan

滇西地区以花岗岩类为主的多旋迴中酸性侵入岩十分发育而著称。它们的化学成分是研究区域岩浆演化规律的基础资料,对阐明区内中酸性侵入岩的基本特点,区域地球化学特征,造岩元素的区域浓度克拉克值,探索区域地质构造环境并指导普查找矿均具有一定意义。 本文据云南省地质局区测队、一、二区测队、区调队1959年以来所取得的岩石化学全分析资料,通过统计、计算及综合分析,试图阐明滇西地区中酸性侵入岩各岩类.

Intermediate-acid intrusive rocks, mainly granitoids, are widely distributed in Western Yunnan. Usually accompanied by regional fault zones, metamorphic zones and tectonic fracture zones, they are characterized by multicycle activity. In this paper, it prensents the following petrochemical data. Average chemical data of 4 chief rock-types.Viz. acidic,intermediate-acidic, intermediate and alkaline rock-types, Average chemical data of 18 principal rocks. Average chemical data of the granites of different ages. Average chemical data of the granites in different tectonic-magmatic zones. Average compositional values of the rock-forming elements the 4 chief rock types and the aboundance ("concentration clarke") of the granitoids and intermediate rocks.