安徽青阳百丈岩钨钼矿床成矿背景与成矿模式  

Ore-forming Setting and Metallogenetic Model of the Baizhangyan Tungsten—molybdenum Deposit in Qingyang,Anhui Province

作　　者：陈芳[1,2] 杜建国[2] 许卫[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]安徽省地质调查院,合肥230001

出　　处：《地质论评》2013年第3期437-445,共9页Geological Review

基　　金：安徽省矿产资源潜力评价项目(编号1212010881616)的成果

摘　　要：本文在总结前人研究成果的基础上,分析了安徽青阳百丈岩钨钼矿床的成矿地质背景、控矿地质条件、成岩成矿时代和矿床成因,建立了矿床成矿模式,并进一步探讨了矿床的成矿地球动力学背景。百丈岩钨钼矿床的成岩物质以壳源为主,成矿是燕山晚期的陆壳重熔型花岗岩侵入的结果,燕山期两次大规模的岩浆活动是成矿的关键因素,对应晚侏罗世花岗闪长岩、早白垩世二长花岗岩及碱性花岗岩,分别形成于陆内挤压加厚和拆沉减薄两种构造背景。百丈岩钨钼矿形成于早白垩世拆沉减薄环境,表明在东部燕山期构造环境发生转变。百丈岩钨钼矿在晚侏罗世挤压加厚转换为早白垩世拆沉减薄的背景中成矿,与东部燕山期成矿大爆发吻合。Based on the analysis of the previous study results of the Baizhangyan Tungsten-molybdenum Deposit in Qingyang, Anhui Province, the paper has analyzed its ore forming setting, ore controlling conditions, epoch of diagenesis and metallogeny, and ore genesis, then built up its metallogenetic model. The paper also has further discussed the geodynamics setting of the deposit. Diagenetic material of the Baizhangyan tungsten-molybdenum ore deposit mainly derived from crustal materials, and ore forming of the deposit was caused by the invasion of the late Yanshanian continental crust remelted granite. The twice extensive magma activities of Yanshannian were the key factors to ore precipitation, which corresponded granodiorite in late Jurassic epoch and adamellite and alkaline granite in early Cretaceous. They each formed under the two different backgrounds of compression thickening and delamination thinning. The Baizhangyan tungsten-molybdenum ore deposit formed in the environment of delamination thinning of lithosphere in early Cretaceous, which indicates ore forming in the setting from compression thickening in late Jurassic epoch to delamination thinning in early Cretaceous during the tectonic turning period , and it fits in well with metallogenetic explosion in the eastern part of China in Yanshanian.

关 键 词：成矿地质背景 成矿年龄 成矿模式 地球动力学 百丈岩钨钼矿床 

分 类 号：P618.6[天文地球—矿床学]