胶东寺庄金矿热液蚀变作用与元素迁移规律  

Hydrothermal Alteration and Element Migration in the Sizhuang Gold Deposit,Jiaodong Province,China

作　　者：卫清[1] 范宏瑞[2,4] 蓝廷广 刘玄[2] WEI Qing;FAN Hong-rui;LAN Ting-guang;LIU Xuan(Institute of Crustal Dynamics China, Earthquake Administration, Beijing 100085, China;Key Laboratory of Mineral Resources Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国地震局地壳应力研究所,北京100085 [2]中国科学院矿产资源研究重点实验室、中国科学院地质与地球物理研究所,北京100029 [3]矿床地球化学国家重点实验室、中国科学院地球化学研究所,贵阳550081 [4]中国科学院大学地球科学学院,北京100049

出　　处：《矿物岩石地球化学通报》2018年第2期283-293,共11页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家自然科学基金青年基金项目(41602073)

摘　　要：为探讨胶东寺庄金矿热液蚀变相关的元素活动规律、蚀变机理及其与矿化的关系,对其花岗质围岩的蚀变带进行了研究。结果显示,伴随着金的矿化,在主断裂的上下盘及矿体附近发育比较典型的钾长石化、绢英岩化、硅化、黄铁绢英岩化蚀变带;伴随强烈的矿物交代反应,各蚀变岩的主微量元素发生了较为明显的改变,大离子亲石元素Rb和轻稀土元素La和Ce表现出了一定的活动性,过渡族元素Cr、Co、Ni、Cu等的地球化学行为在蚀变过程中可被强烈改变,重稀土及高场强元素（Ta、Ti、Nb等）,在钾长石化过程中也表现出了很强的活动性。寺庄金矿中金最可能以Au（HS）2^-络合物形式被搬运,流体温度下降及水/岩反应导致含矿热液化学性质的不断变化造成金-硫络合物稳定性的下降,可能是金沉淀的原因。The Sizhuang gold deposit,located at the Zhaoyuan-Laizhou metallogenic belt in the northwestern border of the Jiaodong Peninsula,is a typical fracture-alteration type gold deposit. The gold mineralization is associated with typical diffusive K-feldspar alteration,sericitization,silicification and pyrite-sericite-quartz alteration at the hanging wall or the footwall of the main fault and near the ore bodies. During the fluid-rock interaction processes,the major and trace elements of altered rock were largely changed. LILE（ Rb） and LREE（ La and Ce） show variable degrees of mobility; TRTE（ Cr,Co,Ni,and Cu） are strongly mobile; HREE and HFSE（ Ta,Ti,Nb） can also be highly modified during the Kfeldspar alteration. The gold in the Sizhuang gold deposit was most likely transported as Au（ HS）^2-complex. When the temperatures of ore-bearing fluid drops or the chemical properties of fluids continuously changed due to water-rock reactions,the stability of Au（ HS）2-complex will be reduced,triggering gold precipitation.

关 键 词：热液蚀变 元素 寺庄金矿 胶东 

分 类 号：P618.51[天文地球—矿床学]