河南桐柏围山城金银成矿系统矿床地球化学特征  

GEOCHEMICAL FEATURES OF GOLD AND SILVER DEPOSITS IN THE WEISHANCHENG AREA , TONGBAI COUNTY,HENAN PROVINCE

作　　者：张宗恒[1] 侯海燕[2] 侯万荣[1] 安国英[1] 费红彩[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]河南省地质矿产勘查开发局,河南郑州450007

出　　处：《现代地质》2002年第3期263-269,共7页Geoscience

基　　金：国土资源部国际合作与科技司自由探索项目(2 0 0 0 44 0 );国家自然科学基金项目 (4 0 0 73 0 13 )

摘　　要：河南桐柏围山城的金银矿床形成于印支—燕山期碰撞造山的动力学背景。对矿床地球化学的研究表明 ,各矿床围岩均发生大规模的成矿元素活化迁移 ,稀土元素和硫同位素资料均指示矿化主要源自早期的矿源层 ;Pb同位素资料指示俯冲下插的南秦岭构造岩片部分融熔形成的花岗岩浆和深源流体提供了部分成矿物质 ;H、O同位素资料指示成矿流体主要由大气降水、部分岩浆热液和变质热液混合演化而成。工业矿体的形成与后期的构造及热流体的叠加改造有关。矿化带内金银矿床具有共同的成矿地质背景和成矿地质特征 ,构成了一个完整的以沉积初始富集。Gold and silver deposits of sediment hosted in the Weishancheng area of Tongbai County in Henan Province were developed under the dynamic background of the collisional orogenesis during Indosinian to Yanshanian period. Study on geochemistry of the deposits shows that wall rocks of all deposits had undergone large scale migration of ore forming elements. REE and sulfer isotope both indicate mineralization was mainly derived from source bed in the early stage.The lead isotope indicates that granitic magma formed from underthrusting tectonic slice of southern Qinling that had experienced partially melting and deep derived fluid provided partial ore forming material. The hydrogen and oxygen isotopes show that ore forming fluid was mainly evolved from meteoric water, partial magmatic water and metamorphic fluid. The forming of the orebodies is realted to later tectonics and superimposed reformation by hot fluid. All gold and silver deposits consist a sedimentary reformat ore forming system of host sediments.

关 键 词：成矿系统 地球化学 成矿元素 同位素 河南 金银矿床 

分 类 号：P618.51[天文地球—矿床学] P618.52[天文地球—地质学]