北祁连西段蛇绿岩型超基性岩铬尖晶石及对岩体含矿性的指示

Chrome Spinel and Its Indication to the Ore-bearing Potential of the Ophiolite-Type Ultrabasic Rocks in the Western Section of Northern Qilian Mountains

产于超基性岩中的副矿物铬尖晶石化学成分复杂,物理性质稳定,抗蚀变能力强.本文通过对北祁连西段九个青羊等六个超基性岩体副矿物铬尖晶石化学成分标型特征,铬尖晶石种属的研究,并计算了铬尖晶石的两种含铁率,探讨了该区分布的蛇绿岩型阿尔卑斯超基性岩体的含矿性.

As a kind of accessory mineral,chrome spinel contained in ultrabasic rocksis complicated in chemical composition,stable in physical property,and strong in antial-teration ability.In this paper,the typomorphic features of chemical compoxition andspecies of chrome spinel contained in six ultrabasic plutons in the western section ofnorthern Qilian Mountains have been studied.The iron-bearing ratio has been calculat-ed,and the ore-bearing features of the ophiolite-type Alpine ultrabasic plutons dis-tributing in this region have also been discussed.