학술논문
广西明山—那林金矿床地质特征及找矿方向 / Geological characteristics and prospecting direction of Mingshan-Nalin gold deposit,Guangxi
Document Type
Academic Journal
Author
Source
矿产勘查 / Mineral Exploration. 15(2):223-233
Subject
Language
Chinese
ISSN
1674-7801
Abstract
明山—那林金矿床位于广西凌云县与凤山县交界处,是桂西北一处典型的卡林型金矿床.矿体赋存于中三叠统百逢组二段,北西西向断裂控制了金矿体的产出,矿石金属硫化物以黄铁矿和毒砂为主,金多以包裹金形式赋存于硫化物中.研究区内已开展过各类地质研究工作,但对矿床解剖尚不够深入,制约了后续找矿工作的开展.为探讨明山金矿后续找矿方向,本文系统总结了矿床地质特征,对其控矿构造进行了分析.结果表明,矿床主控矿断裂F2具有先挤压后拉张的特征,矿体形成于F2由挤压向拉张转换的阶段.结合前人研究成果,推断矿床形成于右江盆地由碰撞挤压到碰撞后伸展的构造转换期——晚三叠世,矿床成矿物质主要来源于地层,但印支末期的岩浆活动可能为成矿流体运移提供了热源.通过总结矿床地质特征,研究矿体的矿化富集规律、成矿物质及成矿动力来源,对研究区后续找矿方向提出了建议.
Mingshan-Nalin gold deposit,located at the junction of Lingyun county and Fengshan county,is a typical Carlin-type gold deposit in northwest Guangxi.The gold ore body occurred in the second member of Middle Triassic Baifeng formation,and is controlled by NWW-trending faults.Ore metal sulfides consist mainly of pyrite and arsenopyrite,and the inclusion gold is mostly hosted in the sulfides.Extensive geological research has been carried out in the study area,but is still devoid of in-depth analyses of the deposit,which restricts the subsequent ore prospecting work.Aimed at exploring the follow-up prospecting direction of Mingshan gold deposit,this paper systematically summarizes its geological characteristics and analyzes its ore-controlling structure.The results show that the master-control fault F2 of the deposit has the characters of post-collisional extension and the ore body is formed in the phase when F2 transforms from compression to extension.Combined with previous research,it can be inferred that the deposit should have been formed in late Triassic,a tectonic transformation period of the Youjiang Basin from collisional compression to extension.The ore-forming materials of the deposit are mainly derived from the strata,but the magmatic activity in the late Indosinian period may provide a heat source for the migration of ore-forming fluids.By summarizing the geological characteristics of the deposit,studying the mineralization enrich-ment law,ore-forming materials and ore-forming power source of the ore body,the suggestions are put forward for the follow-up prospecting direction in the study area.
Mingshan-Nalin gold deposit,located at the junction of Lingyun county and Fengshan county,is a typical Carlin-type gold deposit in northwest Guangxi.The gold ore body occurred in the second member of Middle Triassic Baifeng formation,and is controlled by NWW-trending faults.Ore metal sulfides consist mainly of pyrite and arsenopyrite,and the inclusion gold is mostly hosted in the sulfides.Extensive geological research has been carried out in the study area,but is still devoid of in-depth analyses of the deposit,which restricts the subsequent ore prospecting work.Aimed at exploring the follow-up prospecting direction of Mingshan gold deposit,this paper systematically summarizes its geological characteristics and analyzes its ore-controlling structure.The results show that the master-control fault F2 of the deposit has the characters of post-collisional extension and the ore body is formed in the phase when F2 transforms from compression to extension.Combined with previous research,it can be inferred that the deposit should have been formed in late Triassic,a tectonic transformation period of the Youjiang Basin from collisional compression to extension.The ore-forming materials of the deposit are mainly derived from the strata,but the magmatic activity in the late Indosinian period may provide a heat source for the migration of ore-forming fluids.By summarizing the geological characteristics of the deposit,studying the mineralization enrich-ment law,ore-forming materials and ore-forming power source of the ore body,the suggestions are put forward for the follow-up prospecting direction in the study area.