东昆仑石头坑德铜镍硫化物矿床磁黄铁矿和镍黄铁矿特征及硫饱和机制研究  

The characteristics of pyrrhotite,pentlandite and study of sulfur saturation mechanism in the Shitoukengde Cu-Ni sulfide deposit,East Kunlun,China

作　　者：周伟 祁晓鹏 徐磊 ZHOU Wei;QI Xiaopeng;XU Lei(Sino Shaanxi Nuclear Industry Group Geological Survey Co.,Ltd.,Xi’an 710100,Shaanxi,China)

机构地区：[1]中陕核工业集团地质调查院有限公司,陕西西安710100

出　　处：《矿产勘查》2021年第10期2076-2082,共7页Mineral Exploration

基　　金：中国地质调查局项目(1212011121089);青海省地勘基金项目([2019]64号)共同资助。

摘　　要：石头坑德铜镍硫化物矿床矿石矿物主要为镍黄铁矿+磁黄铁矿+黄铜矿组合,含少量铬铁矿、磁铁矿、紫硫镍矿、马基诺矿、钛铁矿、白铁矿,脉石矿物主要为尖晶石+橄榄石+辉石+角闪石+斜长石组合。矿石中磁黄铁矿均为六方磁黄铁矿(hpo,Fe_(0.901)S~Fe_(0.972)S),属于NC型和2C+NC型,结晶温度高于319℃。单一的较自形镍黄铁矿比从磁黄铁矿出溶的镍黄铁矿结晶温度高,磁黄铁矿和镍黄铁矿结晶温度为319~865℃。地壳硫的加入、围岩同化混染作用以及分离结晶作用,是促使石头坑德铜镍矿床硫达到饱和并且发生熔离作用的重要因素。The ore minerals of Shitoukengde Cu-Ni sulfide deposit are mainly pyrrhotite,pentlandite,chalcopyrite with a small amount of chromite,magnetite,violarite,mackinawite,ilmenite and marcasite.Gangue minerals are spinel,olivine,pyroxene,amphibole and plagioclase.The pyrrhotite in the ore is hexagonal pyrrhotite,their molecular formula can be expressed as Fe_(0.901)S~Fe_(0.972)S,which belongs to NC-type and(2C+NC)-type.The crystallization temperature of pyrrhotite is higher than 319℃.Meanwhile,the crystallization temperature of a single idiomorphic nitrite is higher than that of the nitrpyrite dissolved from pyrrhotite,and the crystallization temperature of pyrrhotite and nitrpyrite can be roughly restricted to 865~319℃.Furthermore,it is concluded that the addition of crustal sulfur,the assimilation and hybridization of surrounding rocks and fractional crystallization are the important factors that lead to the saturation and dissolution of sulfur in shikengde deposit.

关 键 词：铜镍硫化物矿床 磁黄铁矿 硫饱和 石头坑德 东昆仑 

分 类 号：P57[天文地球—矿物学]