新疆富蕴县科克别克提基性杂岩体地球化学特征及找矿远景评价

科克别克提杂岩体赋存有浸染状、贯入式铜(镍)矿体,通过对其地球化学特征分析,并与已知成矿岩体进行对比,认为科克别克提岩体为多期侵入的钙碱性拉斑玄武岩系列,岩浆经历了从钙碱性到碱性的结晶分异演化作用,形成铁镁质中基性—超基性杂岩体。对比的3个岩体稀土微量配分曲线大致平行,显示与母岩相似的来源及相似的分异演化特征:岩浆富集稀土元素,配分模式曲线右倾特点;大离子亲石元素(Rb、Ba、Th、U)富集,高场强元素(Nb、K、Ti、P)显著亏损等。含矿标志分析显示,研究区岩体有形成铜镍硫化物矿床潜力,地表出露高品位矿体,预测深部可能有含矿超基性岩。

Geochemical charactersitics and prospect assessment of Kekebieketi basic complex rock mass in Fuyun county,Xinjiang

The disseminated and injecting type copper-nickel orebodies occur in the Kekebieketi complex rock mass. By geochemical analysis in combination with comparision with typical ore-bearing rock mass, it is thought that the Kekebieketi rock mass is tocalc-alkalic-tholeiite series. The basic magma was experienced crystallization differentiation evolution of from calc alkaline to alkaline and resulted in the formation of mafic intermediate-basic - ultrabasic rock mass. Comparing the distribution pattern of rare earth elements of three complex rock masses, it was found that all of distribution curves were roughtly parallel, which indicated that they have same magma origin and similar crystallization differentiation process. The magma was enriched rare earth elements with right leaned distribution pattern. The large ion lithophile elements of Rb, Ba, Th and U were accumulated and the high field-strength elements of Nb, K, Ti and P were obviously loss. The analysis result of ore-bearing indicators shows that there is great potential to form Cu-Ni sulphides orebody in the rock mass. It is predicted that there is a hidden Cu-Ni-bearing rock mass in the depth in consideration of the high grade of copper-nickel orebody in the outcropped surface.