东准噶尔贝勒库都克铝质A型花岗岩地球化学特征及锡矿化

Geochemical Characteristics and Tin Mineralization of the Beilukuduke A-type Granite in East Junggar

本文通过对新疆东准噶尔卡拉麦里地区贝勒库都克岩体的地球化学研究,初步探讨贝勒库都克A型花岗岩与锡矿的关系。研究表明贝勒库都克黑云母花岗岩具有高硅、低铝、贫钙镁、富碱的特征,FeOt/MgO值高,富集Rb、K、Th等大离子亲石元素及Zr、Hf等高场强元素,亏损Ba、Sr、Nb、Eu等元素,Eu的负异常极强,稀土元素配分模式呈平坦的"V"字型,属于典型的铝质A型花岗岩。该岩体含Sn普遍都比较高,已圈出8条含锡构造蚀变带,为锡的成矿物质来源和锡矿矿床学的深入探索提供了有利的证据。

Through the petrology and geochemistry research for the Beilekuduke granite, in Kalamaili region, East Junggar, Xinjiang, the relations between the Beilekuduke A -type granites and tin deposit are discussed. The research shows that biotite granites are actually typical aluminous A -type granites charac- terized by high Si, low Al, depleted Ca and Mg and abundant alkali. The value of the FeOt/MgO is high. Rb, K, Th and other large -ion lithophile elements and Zr, Hf high field strength elements are enriched, and Ba, Sr, Nb, Eu are depleted, Eu shows negative model and REE was flat ＂V＂ -shaped. The granite contains relatively highter tin, and 8 belts of tin - bearing alteration are identified as a source of tin. This research provides a valuable reference for tin origin of this type deposit.