吉林红旗岭富家矿床矿石矿物化学和硫同位素特征——对铜镍硫化物矿床成因及成矿过程的约束

发布时间：2018-08-19 21:22

【摘要】：本文对吉林红旗岭富家矿床中的矿石矿物进行了系统的矿物化学和硫同位素研究。矿石矿物共生组合主要为磁黄铁矿(Po)-镍黄铁矿(Pn)-黄铜矿(Cp)-黄铁矿(Py),其中Po有单斜磁黄铁矿(Mpo)、六方磁黄铁矿(Hpo)和六方陨硫铁(Tr)相之分,并以Mpo(低温相)为主;Pn有Pn(1)→Pn(2)→Pn(3)的演化趋势;Py有Py(1)→Py(2)→Py(3)→Py(4),均为同一矿化期的不同世代的产物。利用Py-Po矿物对计算出矿石矿物的结晶温度介于500~300℃之间,大致结晶顺序为Pn→Po→Cp→Py。硫同位素特征表明,δ~(34)S值变化较小,介于 4.70‰~+2.40‰之间,δ~(34)S值呈塔式分布,集中分布于 2.5‰~+2.5‰之间,δ~(34)S值略高于地幔硫(0±2‰),并有δ~(34)S_(Po)δ~(34)S_(硫化物)δ~(34)S_(Py)的特征,表明硫来源于地幔,仅有微弱的地壳物质混染,且成矿熔体中硫已达到平衡。结合野外矿体特征和矿石组构特征,富家矿床的成矿物质来源于上地幔;成矿作用方式以岩浆熔离作用为主,兼具岩浆期后热液叠加成矿作用;矿床为通道式成矿,属于深部熔离-贯入式成因。
[Abstract]:The mineral chemistry and sulfur isotope of the ore minerals in the Fujia deposit of Hongqiling, Jilin Province have been studied systematically in this paper. The ore mineral symbiotic assemblage is mainly composed of (Po) pyrrhotite (Pn) chalcopyrite (Cp) pyrite (Py), in which Po has (Mpo), hexagonal pyrrhotite (Hpo) and hexagonal meteorite (Tr) phase. The evolution trend of PN (1) Pn (2) Pn (3) is mainly Mpo (low temperature phase). Py (1) Py (2) Py (3) Py (4) is the product of different generations of the same mineralization period. By using Py-Po mineral pairs, the crystallization temperature of ore minerals is between 500 鈩，

本文编号：2192861