摘要
扬子地块—华夏地块经历武陵期—雪峰期增生造山-碰撞造山形成江南造山带,构成统一的华南板块,进入板内演化阶段。本文从构造-岩浆作用-沉积建造角度,结合地质年代学、古地磁、岩相古地理分析,加里东运动、印支运动属陆内作用,造就了加里东期、印支期两次主要的金矿成矿事件。湖南雪峰山—幕阜山(俗称“金腰带”)加里东期和印支晚期金矿床分区成带产出,构成一条复合型造山型金矿带。区域性构造导矿、次级构造交汇或叠加控矿明显;矿石普遍发育条带状构造,属韧性剪切递进变形的产物。通过对区域成矿背景、金矿成矿理论,金矿床(体)地质特征,结合同位素地球化学、地质找矿成果及深部验证情况等多方面研究表明该成矿带深部找矿潜力巨大,2000 m以浅金远景资源量有望达到3000 t。
The Jiangnan orogenic belt experienced the collision of the Yangtze block and Cathaysian block in the early Neoproterozoic,and was the giant suture of the South China plate.Then,the South China plate entered the intraplate evolution stage.From the perspective of tectonic-magmatism,sedimentary formation and in combination with geological chronology,paleomagnetic and lithofacies palaeogeographic analysis,the authors hold that both tectogenesis of the Caledonian movement and that of the Indosinian movement were intracontinental formations,which created two gold ore-forming events that occurred during the Caledonian period and the extension stage of the Indosinian period.The gold deposits in different ore-forming periods occurred in different structural areas,which together comprised a composite orogenic gold belt from the southwest to the northeast in the Jiangnan orogenic belt.Regional structure played the role of mineral transfer tectonics,and gold deposits occurred obviously in the junction or superimposed structure of secondary structures.Ores of gold deposits generally developed banded structure,which was a product of ductile shear progressive deformation.The research on the regional metallogenic background,gold ore-forming theory,gold deposit geological features combined with isotope geochemistry,geological prospecting results and post-storage conditions revealed consistently the existence of great potential in the deep part of the gold metallogenic belt,and the prospective resources are expected to reach 3000 t at the depth shallower than 2000 m from the southwest to the northeast in Hunan Province.
作者
黄建中
孙骥
周超
陆文
肖荣
郭爱民
黄革非
谭仕敏
隗含涛
HUANG Jian-zhong;SUN Ji;ZHOU Chao;LU Wen;XIAO Rong;GUO Ai-min;HUANG Ge-fei;TAN Shi-min;WEI Han-tao(Geological Bureau of Hunan Province,Changsha,Hunan 410014;Hunan Institute of Geological Survey,Changsha,Hunan 410116;School of Geosicences and Info-physics,Central South University,Changsha,Hunan 410083;MNR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037)
出处
《地球学报》
EI
CAS
CSCD
北大核心
2020年第2期230-252,共23页
Acta Geoscientica Sinica
基金
国家重点研发计划“深地资源勘查开采”重点专项课题(编号:2017YFC0601506)
湖南省自然资源厅科研项目(编号:2017-03,2019-02)
湖南省地质院科研项目(编号:201701,2017-01-01,201902-01,201912)
湖南省重点领域研发计划项目(编号:2019SK2261)联合资助。
关键词
成矿潜力
造山型金矿带
陆内成矿作用
雪峰山—幕阜山
江南造山带
potential
orogenic gold belt
intracontinental mineralization
Xuefeng–Mufu Mountian
Jiangnan orogenic belt
