摘要
洋灰洞子铜矿床位于延边-东宁成矿带,兴凯-延边岩浆构造带北端。矿床发育在花岗闪长斑岩与三叠系黄松群阎王殿组浅变质岩系接触带内侧的角砾岩带内,矿体多呈透镜状和脉状产出。矿床地质和岩相学特征研究表明：围岩蚀变主要是黑云母化、绢云母化、硅化、绿泥石化、绿帘石化及碳酸盐化;蚀变分带特征明显,以岩体为中心向外依次发育钾硅酸盐化带、绢英岩化带和青磐岩化带。矿石矿物主要是黄铜矿、黄铁矿和磁黄铁矿,其次是毒砂、辉钼矿、闪锌矿、方铅矿等。成矿过程可初步划分为4个阶段,从早到晚依次为：（Ⅰ）石英-黄铁矿-毒砂阶段;（Ⅱ）石英-磁黄铁矿-辉钼矿阶段;（Ⅲ）石英-多金属硫化物阶段和（Ⅳ）石英-碳酸盐阶段。流体包裹体类型有富液相（WL）、富气相（WV）、纯液相（L）和纯气相（V）以及含子晶三相（S）包裹体;其中Ⅰ阶段发育富液相包裹体;Ⅱ阶段发育富液相和含子矿物三相包裹体;Ⅲ阶段发育气液两相、纯液相和纯气相以及少量含子晶三相包裹体,呈孤立和群体分布;Ⅳ阶段主要是富液相和纯液相包裹体。流体包裹体均一温度分别为380~417℃、304~368℃、171~310℃和116~189℃,与划分的4个成矿阶段相对应。Ⅰ、Ⅱ阶段包裹体的w（Na Cleq）分别为4.63%~14.52%和5.09%~14.63%;Ⅲ阶段包裹体的w（Na Cleq）分布在1.73%~10.37%和13.44%~15.35%两个区间;Ⅳ阶段包裹体的w（Na Cleq）为0.87%~9.08%。早阶段包裹体气相成分主要为H2O,含少量CO2;主成矿阶段以H2O为主,含少量CH4;晚阶段只有H2O;指示伴随着温度降低,成矿过程由含CO2的水盐体系逐渐演化为含CH4的水盐体系。结合与成矿密切相关的花岗闪长斑岩的斑晶石英和各不同成矿阶段硫化物石英脉的石英H-O同位素及矿石矿物Pb同位素特征,认为成矿流体来源于花岗质岩浆作用或是出溶流体,成矿物质来源
The Yanghuidongzi copper deposit is located in the Yanbian-Dongning metallogenic belt along the northern part of Xingkai-Yanbian magmatic-tectonic zone. The orebodies are mainly hosted in breccia zone of the inner contact zone between granodioritic porphyry and Triassic metamorphic rocks of Yanwangdian Formation in Huangsong Group, which are mainly lenticular and veinlike in shape. Detailed studies of geological features of ore deposit geology and petrography indicate that the wall-rock alterations include mainly biotitization, sericitization, silicification, chloritization, epidotization and carbonation, and the alteration zoning from the lithosome to the wall rock is in order of potassium silicate zone, phyllic zone and propylitization zone. The ore minerals are mainly chalcopyrite, pyrite and pyrrhotite, subordinately arsenopyrite, molybdenite, sphalerite and galena. The ore-forming process can be divided into four stages：（ Ⅰ） quartz-pyrite-arsenopyrite stage;（ Ⅱ） quartz-pyrrhotite-molybdenite stage;（ Ⅲ） quartz-polymetallic sulfides stage; and（ Ⅳ） quartz-carbonate stage. The fluid inclusions in the Yanghuidongzi copper deposit are mainly liquid-rich inclusion（ WL-type）, vapor-rich inclusion（ WV-type）, pure liquid inclusion（ L-type）, pure vapor inclusion（ V-type） and daughter-minerals bearing three-phase inclusion（ S-type）. The Ⅰstage quartz contains WL-type fluid inclusions, the Ⅱ stage quartz contains WL-type and very small S-type fluid inclusions; the Ⅲ stage quartz contains WL-type, WV-type, L-type,V-type and S-type fluid inclusions, which occurs in isolated form or in group; and the Ⅳ stage quartz contains WL-type and L-type fluid inclusions. The homogeneous temperature of the fluid inclusions from Ⅰ to Ⅳ stage are 380 ~ 417℃, 304 ~ 368℃, 171 ~ 310℃ and 116 ~ 189℃, respectively, which correspond to the four ore-forming stages. The w（ Na Cleq） of fluid inclusions from Ⅰ and Ⅱ stage are 4. 63% ~ 14. 5% and 5. 09% ~14. 63%; the w（ Na
出处
《矿床地质》
CAS
CSCD
北大核心
2016年第2期365-380,共16页
Mineral Deposits
基金
国家自然科学基金(编号:41390443
41172072)资助
关键词
地球化学
流体包裹体
稳定同位素
矿床成因
洋灰洞子
铜矿床
黑龙江省东部
geochemistry
fluid inclusion
stable isotope
ore genesis
Yanghuidongzi
copper deposit
eastern Heilongjiang Province
