滇西锡矿的花岗岩类及其成矿作用

滇西锡矿是三江锡矿域的主体。本文论述了三江锡矿域与东南亚锡矿域各带的对比,指出滇西锡矿受特提斯构造演化的控制。腾冲一梁河地区花岗岩类首次划出3个岩群、8个超单元、28个单元和若干侵入体。对滇西原生锡矿床类型、成矿系列和成矿特征进行了较详细的研究。

Granitoids related to western Yunnan(Dianxi)tin deposits and their metallization

The Southeast Asia tin metallogenic domain is the southward extension of the Sanjiang tin metallogenic domain in Southwest China. The western belts and central belts of the two domains are correspondingly connected and comparable with each other, but their eastern belts are not comparable. The Diamxi tin deposits are the main part of the Sanjiang tin metallogenic domain, and their regional settings are related closely to the evolution of Paleo- and Neo-Tethys tectonics. This paper has made a detailed analysis of the granitoids in Tengchong-Lianghe area and for the first time divided them into three rock groups, eight superunits, twenty-eight units and a number of intrusive bodies. In the light of petrologic evolution, geochemistry, assemblages of individual minerals and accessory minerals, REE and isotopic composition, spatial distribution and ore potentiality, the paper has studied the units and superunits. A new scheme is put forward for the classification of primary tin deposits and the metallogenic series. In addition, some preliminary conclusions of the Dianxi tin deposits are drawn which show distinctive regional features.