摘要
贝勒库都克锡矿带花岗岩分为钙碱性和亚碱—碱性２类。稀土元素地球化学研究表明，前者具Ⅰ型花岗岩特征，后者中的亚碱性具Ｓ型花岗岩特征，而碱性则具Ａ型花岗岩特征．稀土元素定量模型计算显示碱性花岗岩是由深部岩浆结晶分异形成，其中，萨北岩体形成时有地壳物质的加入。锡矿主要与晚期分异程度高的亚碱和碱性花岗岩有关。
The granites of the Beilekuduk tin metallogenic belt are divided into two types: calc-alkali granites and subalkali--alkali granites. According to the REE geochemical characteristics, the calc-alkali is I-type granites, the subalkali is S-type and the alkali is A-type. REE quantitative model calculation shows that alkali granites were formed as a result of crystallization differentiation of deep magma from which Sabei granite body was formed with carriers of crust materials. Tin deposits are genetically related to the subalkali and alkali tin-bearing granites formed by high degree differentiation at the later stage of magmatic evolution.
基金
国家"三○五"项目
关键词
碱性花岗岩
锡矿床
成矿带
稀土族
alkali-granite
REE
rock genesis
tin deposit
metallogenic belt
Xinjiang
