东秦岭上宫金矿成矿流体与成矿物质来源新认识  

New Understanding of the Source of Ore-Forming Material and Fluid in the Shanggong Gold Deposit,East Qinling

作　　者：胡新露[1] 何谋春[1,2] 姚书振[1,2] 

机构地区：[1]中国地质大学资源学院,武汉430074 [2]中国地质大学地质过程与矿产资源国家重点实验室,武汉430074

出　　处：《地质学报》2013年第1期91-100,共10页Acta Geologica Sinica

基　　金：全国危机矿山接替资源找矿项目"小秦岭地区金矿床成矿规律总结研究"(编号102kz09y20101)资助的成果

摘　　要：上宫金矿床位于华北克拉通南缘的熊耳地体之中,是典型的构造蚀变岩型金矿。本文对上宫金矿的同位素地球化学资料进行了系统分析和综合研究,对其成矿物质和成矿流体的来源取得了一些新的认识。氢-氧-碳同位素体系研究表明,成矿流体并非来自燕山期岩浆热液,也不是来自于太华群或者官道口群和栾川群的变质脱水作用,而主要来自深部地幔或者由幔源岩浆派生,并在成矿的过程中逐渐向大气降水演化。硫-铅-锶同位素体系指示成矿物质为壳幔混合来源,地幔和太华群可能均提供了部分成矿物质。印支期华北与扬子板块发生碰撞对接时导致了强烈的壳幔相互作用,并驱动深部流体向上运移,上宫金矿正是在这种构造背景下形成的。The Shanggong gold deposit is typical of tectonic altered rock type gold deposit occurring in the Xiongér terrane,southern margin of the North China Craton.The isotopic data about this deposit were systematically analyzed and comprehensively summarized,and some new understanding about the source of ore-forming material and ore-forming fluid were achieved.The D-O-C isotopic system shows that the ore-forming fluid derived neither from the Yanshanian magmatic-hydrothermal solution nor from devolatilization of the Taihua,Guandaokou and Luanchuan groups,but from mantle or mantle-derived magma,and it evolved to meteoric water with development of mineralization.The S-Pb-Sr isotope ratios imply a mixing origin of the materials from crust and mantle,with the mantle and Taihua Group likely contributing partial metallogenic materials.In the Indochina period,the collision of the Yangtze and North China plates may result in the strong interaction between the crust and upper mantle,and drive the deep seated fluid to migrate upward.It is under this tectonic background that the Shanggong gold deposit formed.

关 键 词：上宫金矿 成矿流体 成矿物质来源 同位素地球化学 

分 类 号：P618.51[天文地球—矿床学]