甘肃省玛曲县大水金矿“三位一体”找矿预测地质模型  

The“trinity”geological model for ore prospecting and prediction of the Dashui gold mine in Maqu County,Gansu Province

作　　者：蒲万峰 李鸿睿 袁臻 杨壮 刘斌 PU Wanfeng;LI Hongrui;YUAN Zhen;YANG Zhuang;LIU Bin(Third Institute of Geological and Mineral Exploration,Gansu Bureau of Geology and Mineral Resources,Lanzhou 730050,Gansu,China;Chang'an University,Xi'an 712000,Shaanxi,China)

机构地区：[1]甘肃省地质矿产勘查开发局第三地质矿产勘查院,甘肃兰州730050 [2]长安大学,陕西西安712000

出　　处：《地质通报》2020年第8期1163-1172,共10页Geological Bulletin of China

基　　金：中国地质调查局项目《甘肃省玛曲-合作矿集区找矿预测》(编号:DD2016005219)。

摘　　要：通过对大水金矿地质作用、成矿构造、矿化蚀变和各种成矿信息的研究,总结了成矿地质体、成矿构造和成矿结构面、成矿作用特征标志,进而构建了“三位一体”成矿模式,为下一步找矿预测提供地质模型。确定大水金矿成矿地质体为晚三叠世的格尔括合花岗闪长斑岩及派生脉岩;成矿构造为北西向区域性断裂与晚期北东向、近南北向断裂系统控矿,成矿结构面主要为断裂构造、不同岩性的接触面、古岩溶构造等;成矿作用特征标志主要为硅化、赤铁矿化、褐铁矿化、碳酸盐化,成矿流体属于H 2O-NaCl-CO 2体系,流体气相主要成分为CO 2和H 2O,方解石、灰岩碳氧同位素及黄铁矿硫同位素表明成矿物质主要来源于岩浆。矿床形成于中浅成深度,金的成矿作用发生在相对还原的环境中。Based on the"trinity"prospecting theory proposed by Ye Tianzhu et al.,this paper summarizes the metallogenic geological bodies,metallogenic structures,metallogenic structural planes and characteristics of mineralization through the study of geological processes,metallogenic structures,mineralization alterations and various kinds of metallogenic information of the Dashui gold mine.Then the"trinity"metallogenic model was constructed,which provides a geological model for the next prospecting and prediction.The metallogenic geological body of the Dashui gold deposit is Late Triassic Geer inclusive rock mass and derived veins.The metallogenic structure is controlled by NW-trending regional faults,late NE-trending and nearly NS-trending faults.The main metallogenic structural planes are mainly fault structures,contact faces of different lithologies,and paleokarst structure.The characteristics of mineralization are mainly silicification,hematitization,limonitization and calcitization.The metallogenic fluids belonged to the system of H 2 O-NaCl-CO 2,and the main components of fluid gas were CO 2 and H 2 O.Calcite,limestone carbon and oxygen isotopes and pyrite sulfur isotopes indicate that ore-forming materials were mainly derived from magma.The deposit was formed in the middle-shallow depth,and the gold mineralization occurred in a relatively reduced environment.

关 键 词：西秦岭 大水 三位一体 成矿模式 

分 类 号：P681.51[天文地球—地质学]