摘要
鹿鸣钼矿床是小兴安岭—张广才岭成矿带上典型的特大型斑岩型钼矿床,矿体主要产于早中生代早期中细粒似斑状二长花岗岩内,矿化类型以细脉浸染状矿化为主。根据矿物共生组合及脉体穿插关系将鹿鸣钼矿床划分为4个成矿阶段:黄铁矿-石英阶段(Ⅰ),石英-辉钼矿阶段(Ⅱ),绿泥石-辉钼矿-石英阶段(Ⅲ),石英-碳酸盐阶段(Ⅳ)。成矿流体包裹体有3类:A型气液两相包裹体(L+V),B型含子晶三相包裹体(L+V+S),C型气相包裹体(V)。不同阶段流体包裹体的成分、均一温度、盐度等特征显示成矿流体由早阶段的高温、高盐度的H_2O-CO_2-NaCl体系逐渐演变为晚阶段的低温、低盐度的H_2O-NaCl体系。氢氧同位素特征显示成矿早阶段以岩浆水为主,随成矿演化有不同程度大气水的加入。根据矿床产出特征、矿物共生组合和流体包裹体特征,认为流体的沸腾作用和CO2等气相组分大量逸失是成矿流体形成矿床的主要因素。
The Luming molybdenum deposit is a super-large porphyry molybdenum deposit in Xiaoxinganling-Zhangguangcailing ore belt.Ore bodies mainly occurr in the early stage medium-fine grained porphyroid monzonitic granite of Early Mesozoic Era.The mineralization is mainly veinlet-dissemination type.According to crosscutting relationships of different veins and mineral paragenesis there are four ore-forming stages：（Ⅰ）the pyrite-quartz;（Ⅱ）the quartz-molybdenite;（Ⅲ）the chlorite-molybdenite-quartz;and（Ⅳ）the quartz-carbonate.Three types of fluid inclusions have been distinguished：type A vapor-liquid（L＋V two-phase）inclusions,type B-daughter crystal-bearing inclusions（L＋V＋S three phase）and type C-vapor inclusions（V）.Composition,homogeneity temperature and salinity of fluid inclusions from different stages demonstrate that the mineralizing fluid of the Luming deposit is characterized by evolution from the early stage high temperature and high salinity H_2O-CO_2-NaCl system to the late stage low temperature and low salinity H_2O-NaCl system.Hydrogen and oxygen isotopic compositions indicate that magmatic fluid was dominant in early mineralization stage and meteoric water incorporates to some extent with the evolution.The above mentioned characteristics suggest that fluid boiling and CO_2 escaping were the leading factor for the formation of the deposit.
出处
《地质找矿论丛》
CAS
CSCD
2015年第4期471-479,共9页
Contributions to Geology and Mineral Resources Research
关键词
鹿鸣钼矿
斑岩
成矿流体
包裹体
氢氧同位素
黑龙江省
Luming Mo deposit
porphyry
Ore fluid
inclusion
H
O isotopes
Heilongjiang province
