摘要
岩石地球化学分析表明,东昆仑三岔口软玉矿床的成矿母岩主要为灰质白云岩,与新疆和田等著名软玉矿区的成矿母岩相比,该矿区软玉围岩贫Mg而富Ca,成矿Mg源相对不足而Ca强烈过剩。矿区出露的火成岩主要为基性辉长岩,软玉为灰质白云岩与基性辉长岩岩体接触交代的产物。通过对内外接触带常量元素含量变化趋势的分析,认为碳酸盐岩提供了软玉成矿所需的Ca,Mg及Fe2+,而火成岩体则提供了Si,Fe3+以及K,Na,Mn,Al,P等物质。
Through the geochemical study, we come to the conclusion that the wall rock of the nephrite deposit is mainly composed of dolomitized limestone. Compared with Hetian nephrite deposit, the wall.rock here is short of Mg but enriched with Ca. The igneous rock exposed in the mining area is mainly gabbro. The nephrite is the result oF the contact metasomatism oF igneous rocks and carbonates Trend analysis of the common elements change at the contact zone between the igneous rock and carbonate rock shows.that the carbonates supplied the nephrite with Ca, Mg and Fe^2＋ , and the igneous rocks Si.Fe^3＋.and some.other trace elements such as K,Na,Mn,Al,P.
出处
《地质找矿论丛》
CAS
CSCD
2006年第3期195-198,202,共5页
Contributions to Geology and Mineral Resources Research
关键词
地球化学
软玉
矿床成因机制
新疆
geochemistry
nephrite
genetic mechanism
Xinjiang
