湖北雾渡河断裂带金矿地球化学特征及成因探讨——以姜家沟金矿为例  

Geochemical Characteristics and Genesis of Gold Depositsin Wuduhe Fault Zone,Hubei Province

作　　者：李天元 郭威 陈梦杰 刘海 吴义松 Li Tianyuan;Guo Wei;Chen Mengjie;Liu Hai;Wu Yisong(Hubei Institute of Metallurgical Geology(Central South Institute of Metallurgical Geology),Yichang,Hubei443003)

机构地区：[1]湖北冶金地质研究所(中南冶金地质研究所),湖北宜昌443003

出　　处：《资源环境与工程》2021年第2期137-145,共9页Resources Environment & Engineering

基　　金：湖北省自然科学基金项目——湖北省宜昌市雾渡河断裂带金矿成矿规律及成因研究(2016CFB637);黄陵断穹核北部变质杂岩形成和演化及晶质石墨成矿机制研究(2019CFB751)。

摘　　要：通过对雾渡河断裂带金矿——姜家沟金矿的矿体、矿石组成、结构构造、地球化学、流体包裹体及同位素分析,Au主要赋存于多金属硫化物及石英晶格中,以含金石英脉型为主体,富Na贫K,缺乏大离子亲石元素和高场强元素。姜家沟金矿成矿温度为169.4~269.7℃,压力为22.15~35.32 MPa,深度为0.74~1.18 km;成矿水体来源于岩浆水和变质水;部分成矿物质来源于野马河组的斜长角闪片麻岩和中细粒花岗岩;成矿热液主要来源于上地幔深源岩浆,具有壳幔混源特征,属于中低温、高盐度、高密度成矿流体。Based on the analysis of ore body,ore composition,structure,geochemistry,fluid inclusions and isotopes of the gold deposit in Wuduhe fault zone—Jiangjiagou gold deposit,it is found that Au mainly occurs in polymetallic sulfide and quartz lattice,with gold-bearing quartz vein type as the main body,rich in Na and poor in K,and lack of large ion lithophilic elements and high field strength elements.The mineralization temperature of Jiangjiagou gold deposit is 169.4~269.7℃,the pressure is 22.15~35.32 MPa and the depth is 0.74~1.18 km.The ore-forming water is derived from magmatic water and metamorphic water.Part of the ore-forming materials came from the plagioclase amphibole gneiss and medium-fine granites of the Yemahe Formation.The ore-forming hydrothermal fluid is mainly derived from the deep magma of the upper mantle and has the characteristics of crust-mantle mixed source.It belongs to the ore-forming fluid of medium low temperature,high salinity and high density.

关 键 词：雾渡河断裂带 姜家沟金矿 地球化学 含金石英脉 成矿流体 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]