黑龙江高松山金矿床成矿机制研究

发布时间：2018-04-26 01:22

本文选题：黑龙江高松山 + 低硫型浅成低温热液金矿　；参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：高松山金矿床位于黑龙江省逊克县东南部,是小兴安岭-张广才岭成矿带上的典型金矿床之一,矿床规模达到大型。本文在充分收集整理前人研究资料的基础上,通过野外调研查明该矿床的成矿地质背景与矿床地质特征,并对成矿阶段进行了划分,运用全岩主微量测试、单矿物稀土元素测试、稳定同位素分析、流体包裹体测试等研究方法,重点对该矿床容矿火山岩形成环境、成矿流体特征、成矿流体来源、成矿物质来源等进行研究,在此基础上对矿床成因与成矿机制进行探讨,并取得了如下成果:高松山金矿床容矿围岩是下白垩统板子房组安山岩、玄武安山岩与安山质火山角砾岩,矿体严格受断裂构造控制,赋存在沙阿其河断裂的NWW、NEE、近EW向次级断裂中,矿石类型以构造角砾岩型和强硅化型矿石为主。围岩蚀变主要是硅化与方解石化,以及冰长石化、绢云母化、伊利石化等,矿化主要是硅化与黄铁矿化。成矿流体具有低温(168℃~325℃)、低盐度(1.05-4.18wt%Na Cleq)的特征,为一典型的低硫型浅成低温热液矿床。成矿作用可划分为4个阶段,分别是:阶段1:绢云母-黄铁矿-闪锌矿阶段;阶段2:灰白色细晶至玉髓状石英-绢云母-黄铁矿-闪锌矿阶段;阶段3:乳白色石英-伊利石-冰长石-黄铁矿-黄铜矿阶段;阶段4:网脉状、团块状方解石-黄铜矿-方铅矿阶段。其中,成矿第2、3阶段Au大量沉淀析出,为主成矿阶段。氢、氧、碳同位素特征研究表明成矿流体为大气降水补给的地下热水与岩浆流体共同组成的混合流体,并以大气降水补给的地下热水为主。硫同位素组成以及矿石微量元素特征研究表明容矿火山岩并非成矿物质的唯一来源,存在其他端元与火山岩一同为成矿作用提供必要的物质来源。沸腾作用是引起成矿流体中矿质沉淀富集的主要成矿机制。矿床形成于板子房组火山岩的火山喷发作用晚期,成矿环境与中生代晚期古太平洋板块的持续俯冲作用所引发的加厚的岩石圈发生拆沉、伸展和减薄作用关系密切。
[Abstract]:The high Songshan gold deposit, located in the southeastern part of the county of Heilongjiang Province, is one of the typical gold deposits in the small Xingan Ling Zhang Guang Jill metallogenic belt, and the size of the deposit has reached a large scale. On the basis of the study on the formation environment of the ore bearing volcanic rocks, the characteristics of the ore-forming fluid, the source of ore-forming fluid and the source of the ore-forming materials, the origin of ore deposits and the metallogenic mechanism of the ore are put forward on the basis of the study of the study methods of the total rock main trace test, the single mineral rare earth element test, the stable isotope analysis and the fluid inclusion test. The results are as follows: the surrounding rock of the gold deposit in the high Songshan gold deposit is andesite in the lower Cretaceous plate formation, basalt andesite and Anshan volcanic breccia, and the ore body is strictly controlled by the fault structure, and the NWW, NEE, and near EW secondary faults exist in the Shah He River fault, and the ore type is composed of tectonic breccia type and strong silicified ore type. The main alteration of surrounding rock is silicification and calicization, as well as ice long petrification, sericite and illite, and the mineralization is mainly silicification and pyrite mineralization. The mineralization fluid is characterized by low temperature (168 ~325 C) and low salinity (1.05-4.18wt%Na Cleq), which is a typical low sulfur type epithermal deposit. The mineralization can be divided into 4 stages. Stage 1: sericite - pyrite sphalerite stage; stage 2: gray white fine grain to chalcedony quartz - sericite - pyrite - sphalerite stage; stage 3: milky white quartz - illite - plyite - pyrite - chalcopyrite stage; stage 4: network pulse, block calcite - chalcopyrite - galena stage. Among them, Au heavy precipitation in the 2,3 stage of mineralization. The study on the characteristics of hydrogen, oxygen and carbon isotopes indicates that the ore-forming fluid is a mixture of underground water and magmatic fluids recharged by atmospheric precipitation, which is mainly the underground hot water recharged by atmospheric precipitation. The study of sulfur isotopes and trace elements of ore indicates that the ore bearing volcanic rocks are not minerals. The only source is the existence of other endpoints and volcanic rocks to provide the necessary material source for the mineralization. The boiling effect is the main metallogenic mechanism for the mineralization and enrichment of ore-forming fluids. The deposit is formed in the late stage of volcanic eruption of the volcanic rocks of the plate formation of the plate, and the metallogenic environment and the continuous subduction of the Paleozoic Pacific plate in Late Mesozoic. The thickening of the lithosphere induced by the action is closely related to the delamination, extension and thinning.

【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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