河南嵩县纸房钼矿床流体包裹体研究及矿床成因

河南嵩县纸房钼矿床位于秦岭造山带北部的熊耳地体，矿体以石英脉形式产于熊耳群火山岩，并受熊耳地体南边界断裂马超营断裂的次级断裂构造控制。成矿过程包括早、中、晚三个阶段，分别以石英-黄铁矿、石英-多金属硫化物和石英-碳酸盐组合为标志，早阶段石英脉或矿物组合遭受了构造变形和角砾岩化。早、中阶段的石英中可见CO2-H2O型、NaCl-H2O型及含子晶型等3类流体包裹体，而晚阶段碳酸盐只发育NaCl-H2O型包裹体。早、中、晚阶段的流体包裹体均一温度分别为467—380℃、360—250℃和240～137℃，从早到晚逐渐降低；早、中、晚3个阶段流体包裹体盐度分别为0．18％～13．13％NaCl．eqv、0．01％～20．70％NaCl．eqv和0．35％～12．85％NaCl．eqv，早、中阶段含子晶包裹体的盐度为28．04％～31．35％NaCl．eqv。早阶段含子晶包裹体系捕获的不饱和溶液，中阶段含子晶包裹体既捕获自过饱和溶液，也捕获自不饱和溶液。早、中阶段的流体包裹体均一压力集中在180—220MPa和40～80MPa两个范围，表明成矿流体是在6km～8km深处交替于静岩和静水压力体系之间的流体系统；晚阶段流体包裹体均一压力为50～80MPa，代表张性构造内充填的静水压力流体。静岩和静水压体系之间的振荡性交替现象，与针对造山型金矿建立的断层阀模型吻合，是振荡性流体沸腾或同震愈合-破裂的结果。沸腾导致的CO2等挥发组分的逃逸使流体浓缩甚至过饱和，增高了流体的pH值和还原性，促进辉钼矿等成矿物质快速沉淀。总之，纸房钼矿床是陆陆碰撞体制发育的造山型成矿系统。考虑到早、中阶段石英中多数流体包裹体均一至气相，预测现行勘探深度之下具有较大的寻找高品位钼矿床的潜力。

Fluid inclusion constraints on the origin of Zhifang Mo deposit Songxian county,Henan provine.

The Zhifang Mo deposit in Songxian County,Henan Province is located in the Xiong'er Terrane in northern Qinling orogen.Its orebodies,occurring as quartz-veins,are hosted in volcanic rocks of the Xiong'er Group and controlled by subsidiary faults of the Machaying fault which is the south boundary fault of the Xiong'er terrane.Three stages of hydrothermal ore-forming process are recognized,Early,Middle and Late,characterized by quartz-pyrite,quartz-sulfides and carbonates,respectively.The early-stage quartz-v...