东昆仑德尔尼矿床中矿床(体)的叠加成矿作用研究

Superimposed Mineralization of Deerni Co-Cu Deposit, East Kunlun Mountains, NW China

摘要: 德尔尼大型钴铜矿床是一个以海底喷流-沉积成矿为主体,以后期叠加成矿为特色的复合成矿作用的矿床.其叠加成矿作用,则以钴矿(化)体的"套鞋状"产出和磁黄铁矿的"薄层外壳"为标志,以赋矿超基性岩与工业矿体接触处发生的蚀变作用、星点状磁铁矿的消失或净化,以及镍元素带入为支撑点体现出来的,它昭示了超基性岩体在叠加成矿过程中对德尔尼矿床成矿作用的某种贡献.

Abstract: The Deerni large Co-Cu deposit was mainly formed by submarine exhalative-sedimentation and also enriched by late-stage super imposed mineral ization.The superim posed mineralization is indicated by occurrence of Co orebodies in the shape of overshoes and pyrrhotite thin shell.Also, it is characterized by alteration, disappearance or purification of spar sely disseminated magnetite and participation of Ni in the contact sites of ore-bearing ultrabasic rocks and industrial or ebodies, with the criteria of Co overshoes and, All these pheno mena indicate that the ultrabasic rocks have made certain contribution to the mineralization of the Deerni deposit.