新疆喀拉喀什河金刚石找矿指示矿物原生表面特征研究

新疆喀拉喀什河水系的重砂矿物中发现了高铬铬铁矿、镁铝榴石、镁钛铁矿和铬透辉石等金刚石找矿指示矿物。结果表明，这些重消矿物不仅发育因河流和风力搬运作用形成的次生表面特征（如贝壳状断口、Ｖ形撞击坑等），个别矿物还残留有金刚石找矿物原生表面特征，如丘状突起、三角和菱形熔坑等表面（ＳＳ），且为轻微磨损类。这些残留有刻蚀表面（ＳＳ）的矿物形成于金伯利岩浆最后侵位阶段，结合该区水动力条件，推测它们被搬运蚀表面

REMANANT OF ORIGINAL SURFACE RESEARCH ON INDICATOR MINERALS FOR DIAMOND PROSPECTING IN XINJING

Indicator minerals for diamond prospecting, such as high Cr-bearing chromite pyrope, Cr- picrotanite and Mg-ilmenite, have been found during the diamond research by heavy minerals in Xin- jiang .The results reveals that some diamond indicators surface with V-striking hole and conchoid break ore were made by river and wind power transition. Moreover, several light abrasion type indicator miner- als forming at ultimate invading phase of kimberlite magma have remanant of original surface such as strumae, triangle and lozenge melt hole, etc. on diamond indicator minerals. It was inferred that the transitted distance of indicator minerals was about 10-50km combined with the local river power.