摘要
安徽省金矿床(点)主要集中于其南部地区,金多以共生或伴生形式产在铜、铁、硫矿床中,中大型金矿床少,独立的岩金矿更少。前人对安徽南部地区开展了大量针对铜、铁、硫等矿床地质地球化学及其成因上的研究,而对独立的岩金矿床则鲜有研究。本文通过对该区独立岩金矿床金成矿地质背景介绍,对区内铜陵朝山、铜陵杨冲里、南陵吕山、池州抛刀岭、休宁天井山等代表性金矿床特征总结归类,对与金成矿相关的地层、构造及岩浆岩等控矿条件进行了梳理和分析研究,同时对区域金矿床时间和空间分布规律特征进行了探讨归纳,从而将安徽南部地区独立金矿床大致划分为五种成因类型,并指出该区金成矿主体发生在燕山早期,受中生代太平洋板块俯冲和俯冲后拉张双重作用影响,同时金成矿主要与早期俯冲阶段有关,晚期则叠加了少量金及多金属矿种,是燕山期中国东部构造体制转换与成矿大爆发事件具体体现和响应。含金流体主要富集在由晋宁期基底基础上演化而来断裂构造中或岩体与围岩接触带上,大致具有北东向、北东东向集中展布的特征。通过上述工作,以期为今后在该地区开展与金矿床相关的野外地质工作及科研工作者提供借鉴,进而为该地区金矿取得找矿突破提供指导和理论基础。
More than 70 gold deposits have been found in Anhui Province,among them,only few are middle to large sized.Most of the gold deposits are commonly associated with Cu,Fe and S deposits,characterized by scattered distributions,small reserves.Furthermore,independent rocky gold deposits are even much fewer.Gold deposits and their resources of Anhui Province are mainly concentrated in the southern region along the Yangtze River belt,the transition belt and Jiangnan block.Since gold is mostly produced in the Cu,Fe and S deposits with a symbiotic or accompanying form,most previous studies were focused on geochemistry and genesis,with limited investigations on independent rocky gold deposits.In recent years,a number of large and medium-sized independent gold deposits(e.g.,Yangchongli,Paodaoling and Zhaojialing)have been discovered and explored in the southern Anhui,showing the great prospecting potential of independent rocky gold deposits.In this study,we analyzed and summarized the geological settings and geochemical characteritics of gold mineralization and classic gold deposits in southern Anhui Province,including Chaoshan and Yangchongli in the Tongling region,Lvshan in Nanling,Paodaoling in Chizhou region,and Tianjingshan in Xiuning.Special attentions have been paid on their spatial and temporal distribution features,especially in respect of the related strata,lithology,magmatic rocks and regional structures.Based on the present study,we draw facts that these independent gold deposits from southern Anhui Province can be divided into five types in terms of their petrogenesis.The gold mineralization occurred in Early Yanshanian,and was affected by the dual effects of subduction and post-subduction tension of the Paleo-Pacific plate.It is the response of the tectonic regime transformation and metallogenic explosion in eastern China during the Yanshanian Period.The gold-bearing fluids are mainly enriched in the fault structure or the contact zone between igneous rocks and surrounding rocks evolved on the basis of Jinning basement.Gold ores have the characteristics of concentrated distributions in NE and NNE.According to above studies,we aim to provide clues for field geological work and scientific research,further supply the guidance and basic theory for prospection and exploration of gold deposits in southern Anhui.
作者
段留安
杨晓勇
魏有峰
吴礼彬
DUAN LiuAn;YANG XiaoYong;WEI YouFeng;WU LiBin(Yantai Geological Survey Center of Coastal Zone,China Geological Survey,Yantai 264004,China;School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China;School of Mathematics and Physics,China University of Geosciences,Wuhan 430074,China;Anhui Geological Survey,Hefei 230001,China)
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2020年第1期225-244,共20页
Acta Petrologica Sinica
基金
国家科技部深地开采专项研究计划(2016YFC0600404)
国家自然科学基金项目(41673040、41372097)
中国地质调查局项目(胶西北地区金矿资源勘查)联合资助
关键词
控矿条件
成矿规律
成因类型
金矿床
安徽南部
Ore-controlling condition
Metallogenic regularity
Genetic type
Gold deposit
Southern Anhui province
