桐柏老湾金矿带成矿构造体系演化研究及其地质意义  

The study on the evolution of metallogenic tectonic system and its significance of Laowan gold metallogenic belt in Tongbai county

作　　者：陈建立[1] CHEN Jianli(No.1 Insistute of Geology and exploration,Henan Geology and exploration Bureau,Zhengzhou450001,China)

机构地区：[1]河南省地质矿产勘查开发局第一地质勘查院,郑州450001

出　　处：《地质找矿论丛》2019年第1期36-46,共11页Contributions to Geology and Mineral Resources Research

基　　金：河南省地勘基金项目(编号:豫国土资函[2015]258)资助

摘　　要：通过对老湾成矿带各期构造作用、区域变质作用、岩浆作用、矿化富集作用研究,将老湾成矿带成矿构造体系演化分为三个阶段:加里东-华力西期深层次韧性剪切作用,形成的NNW向构造控矿因素深远,起初始富集作用;从印支晚期(236～214 Ma)开始,在燕山期或期前(132.5Ma)为脆-韧性剪切-右行走滑体系,矿液再次充填控矿形成现在的富矿体;燕山末期后发生了浅层次脆、韧性构造和构造推覆。并建立了老湾金矿带"早期老湾韧性剪切成矿构造系统"与"中期高角度右型走滑脆韧性断裂构造系统叠加"和"晚期构造掩盖或破坏"三期成矿构造演化体系。三期成矿构造演化体系的建立和"晚期老湾岩体推覆于龟山岩组上"的认识,极大地拓展了赋矿地层空间,为取得找矿突破提供重要理论依据。Study on stages of tectonism,regional metamorphism,magmatism,mineralized enrichment of Laowan gold metallogenic belt divides the metallotectonic evolution into three stages:1)CaledonianVariscan deep ductile shearing stage during which the long term NWW ore-controlling structure and initial ore material enrichment were formed;2)brittle-ductile shearing-dextral strike slip stage from Late HindoChina(236~214 Ma)to Yanshanian or Pre-Yanshanian period(132.5 Ma)during which ore fluid in the system to formed the present rich ore bodies;3)Late Yanshanian stage during which secondary shallow brittle,ductile shearing and structural nappe were formed.The three stage metalognic model of the belt is built,i.e.the main ore-forming stage,the early Laowan ductile shearing stage,the middle high angle dextral strike slip stage which overprinted on the first stage and the late structural nappe which destroyed and covered the pre-existed ore bodies.The three stage model,especially the viewpoint of overthrusting of the Late Laowan intrusive body on the Guishan Formation would expand considerably the prospecting area and supply theoretical basis for prospecting breakthrough in the area.

关 键 词：老湾金矿带 韧性剪切带 右行走滑 叠加富集 成矿构造体系 演化模式 河南省 

分 类 号：P618.51[天文地球—矿床学]