江西金山金矿床成矿地球化学特征

金山金矿床的微量元素、同位素和流体包裹体地球化学特征表明 :(1)成矿过程明显复杂于成岩过程 ,成矿作用中与Au关系最为密切的微量元素是Ag、As、Sb ,矿石中若干微量元素丰度低于区域含矿建造丰度 ,与产于动力变质环境下的韧性剪切带系列金矿床相似 ;(2 )成矿物质主要来自浅变质的中元古界双桥山群含金建造 ,燕山期岩浆热液活动为该矿床的后期加富提供了部分成矿物质 ,金山金矿床的层控特征与江南金成矿带中其它金矿极为相似 ;(3)成矿流体主要为变质 变形过程中产生的变质热流体、再循环大气水和地球深部的高温、高压流体。

A STUDY OF METALLOGENO-GEOCHEMICALL CHARACTERISTICS OF JINSHAN GOLD DEPOSIT, JIANGXI PROVINCE

Trace element geochemical characteristics, Pb-S isotopes and fluid inclusions for the Jinshan gold deposit demonstrate: (1) The ore-forming process is more complicated than the rock-forming process. Ag, As and Sb are the trace elements, which are closely related to gold association in the ore-forming process. The abundance of certain elements is less than that of the regional ore-bearing formations, which are similar to the gold deposits hosted in ductile shear zone under dynamometamorphic conditions. (2) The ore-forming material of the Jinshan gold deposit comes dominantly from the gold-bearing formation of the Shuangqiaoshan Group formed during the Mid-Proterozoic; the magmatic hydrothermalism at the Yanshanian period also offered some ore-forming materials. The strata-bound characteristics of the Jinshan gold deposit are extremely similar to those of other gold deposits in the Jiangnan Au-forming zone in China. (3) The ore-forming fluid consists mainly of metamorphic fluid, recycled atmospheric water and high-temperature and high-pressure fluid from deep earth during the process of metamorphism-transformation.