马鞍桥金矿床成矿流体特征研究  

Study on Ore-forming Fluid Characteristics of Ma'anqiao Gold Deposit

作　　者：吕拾零[1,2] 程顺有[1,2] 朱赖民[1,2] 郭波 李海明[1,2] 王正良[1,2] 寇婷 

机构地区：[1]西北大学大陆动力学国家重点实验室,陕西西安710069 [2]西北大学地质学系,陕西西安710069 [3]河南地质调查院,河南郑州450001

出　　处：《地下水》2012年第3期223-226,共4页Ground water

基　　金：西北大学大陆动力学国家重点实验室科技部专项经费资助项目(BJ0813317);西北大学地质学基地学生创新基金专项经费资助项目(XDCX07-16)

摘　　要：马鞍桥金矿床产于西秦岭造山带商丹断裂带南缘的E-W脆-韧性剪切带中,矿床空间定位和矿体展布受脆-韧性剪切带控。选择马鞍桥金矿床矿石、地层岩石和二长花岗斑岩的代表性样品,针对性地开展碳-氧和氢-氧同位素分析测试。研究结果证明:成矿早阶段和主阶段成矿流体以变质热液或地层改造热液为主,而晚阶段则主要为大气降水。马鞍桥金矿床矿化地质特征和同位素地球化学组成为广义的类卡林型金矿床或属介于造山型和卡林型金矿床之间的过渡类型。The gold space and ore-body distribution of Ma'anqiao gold deposit,which is produced in the east-west trending brittle-ductile shearing deformation zone to the southern margin of the Shangdan fault zone in the Western Qinling Orogenic Belt,are controlled by the brittle-ductile shearing zone.Conducting the carbon-oxygen isotopes and the hydrogen-oxygen isotopes analysis test which representative samples choose in the strata rocks、ores and monzonitic granitic porphyry from the Ma'anqiao gold deposit.Furthermore,the hydrogen and oxygen isotopes study of the ore-forming fluids shows that the main ore-forming fluid is metamorphic or strata transformation hydrothermal in the early and main ore forming stages,while it is meteoric water in the late stage.The mineralization characteristics and the isotopic compositions of the Ma'anqiao gold deposit is similar to generalized Carlin-like-type or a transitional type between orogenic and Carlin-type gold deposit.

关 键 词：马鞍桥金矿床 成矿流体 矿床成因 卡林-类卡林型金矿床 

分 类 号：P618[天文地球—矿床学]