[1]陈 港,陈懋弘,葛 锐.2021.广西贵港砷矿沟银铅锌矿床控矿因素分析及成矿预测.大地构造与成矿学,优先出版:001-18.doi:10.16539/j.ddgzyckx.2021.06.009
 CHEN Gang,CHEN Maohong,GE Rui.2021.Ore-controlling Factors and Metallogenic Prediction of Shenkuanggou Ag-Pb-Zn Deposit in Guigang, Guangxi.Geotectonica et Metallogenia,优先出版:001-18.doi:10.16539/j.ddgzyckx.2021.06.009
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广西贵港砷矿沟银铅锌矿床控矿因素分析及成矿预测
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2021年优先出版
页码:
001-18
栏目:
出版日期:
2022-12-30

文章信息/Info

Title:
Ore-controlling Factors and Metallogenic Prediction of Shenkuanggou Ag-Pb-Zn Deposit in Guigang, Guangxi
作者:
陈 港1 陈懋弘1 葛 锐1 2 郭申祥1 3 吴启强4
1.中国地质科学院矿产资源研究所 自然资源部成矿作用与评价重点实验室, 北京 100037; 2.万宝矿产有限公司, 北京 100053; 3.中国建筑材料工业地质勘查中心湖北总队, 湖北 武汉 430000; 4.广西壮族自治区第六地质队, 广西 贵港 537100
Author(s):
CHEN Gang1 CHEN Maohong1 GE Rui1 2 GUO Shenxiang1 3 WU Qiqiang4
1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China; 2. Wanbao Mining Ltd., Beijing 100053, China; 3. Hubei Branch of China National Geological Exploration Center of Building Materials Industry, Wuhan 430000, Hubei, China; 4. No.6 Geological Team of Guangxi, Guigang 537100, Guangxi, China
关键词:
岩浆热液成矿系统 控矿因素 成矿预测 砷矿沟银铅锌矿床 广西贵港
Keywords:
magmatic-hydrothermal metallogenic system ore-control factor metallogenic prediction Shenkuanggou Ag-Pb-Zn deposits Guigang of Guangxi
DOI:
10.16539/j.ddgzyckx.2021.06.009
文献标志码:
A
摘要:
一般而言, 岩浆热液矿床除与侵入岩体有关外, 与地层和构造关系也比较密切, 控矿因素往往比较复杂, 确定其中最主要的控矿因素往往是成矿预测成败的关键。广西贵港砷矿沟银铅锌矿床位于大瑶山隆起西南部龙山鼻状构造的最西南段, 是大平天山岩浆热液成矿系统的一部分。矿床以顺层产出的矽卡岩型矿体为主, 切层的脉状矿体为辅。系统的野外测量和研究表明, 脉状矿体形态简单, 主要受控于近直立的北北西向断层; 层状矽卡岩型矿体形态十分复杂, 除受控于大平天山和龙头山岩体外, 还受寒武系黄洞口组中的灰岩夹层、加里东期复杂褶皱形态以及北北西向断层的联合控制。其中大平天山和龙头山岩体为矿床的形成提供了成矿物质、成矿流体和热源, 并控制了成矿元素的空间分带; 寒武系黄洞口组中的灰岩夹层是形成矽卡岩型矿体的岩性条件, 控制了矿层的数量和厚度; 近东西走向的复式褶皱控制了矿体的具体形态和产状; 北北西向断层控制了矿段的平面空间位置。本文在正确理解上述岩浆-地层岩性-褶皱-断层等控矿因素的基础上, 确定北北西向断层为主要的流体通道, 其东西两侧20~70 m的范围内寒武系黄洞口组灰岩夹层可以形成层状矽卡岩型矿体, 据此由东往西划分了3个矿段, 经钻探验证成功在矿区西部发现了新的矿段。本次成矿预测改变了前人以近东西走向灰岩追索找矿的思路, 转为沿北北西走向断层(节理)追索层状矿体, 把一个被前人否定评价的矿床给予了肯定评价并获得成功。此认识和经验对复杂褶皱地区, 受多要素控制的岩浆热液矿床的成矿预测具有一定的借鉴意义。
Abstract:
Generally speaking, magmatic-hydrothermal deposits are not only related to intrusive rock but also closely related to strata and structures. The ore-controlling factors are often complex, and the determination of the most important factor is often the key to the success of metallogenic prediction. As a part of the magmatic-hydrothermal metallogenic system of the Dapingtianshan, the Shenkuanggou Ag-Pb-Zn deposit in Guangxi is located in the southwest part of the Longshan nose structure in the southwest of the Dayaoshan uplift. The deposit is dominated by bedding skarn-type ore bodies, supplemented by bedding vein-type ore bodies. Systematic field surveys and research show that the vein-type ore bodies are simple in shape and mainly controlled by nearly vertical NNW-trending fault. The layered skarn-type ore bodies are very complex in shape, which is not only controlled by Dapingtianshan and Longtoushan rock, but also controlled by limestone intercalation in Cambrian Huangdongkou formation, Caledonian complex fold shape, and NNW-trending faults. The Dapingtianshan and Longtoushan plutons provide ore-forming materials, ore-forming fluids, and heat sources for the formation of the deposit, and control the spatial zoning of ore-forming elements. Limestone intercalation in the Cambrian Huangdongkou formation is an indispensable material condition for the formation of skarn-type orebody, which controls the number and thickness of ore beds. The EW-trending composite fold controls the specific shape and occurrence of ore bodies; the NNW-trending composite fold controls the specific shape and occurrence of ore bodies. Faults control the plane space position of the ore block. Based on a correct understanding of the above ore controlling factors, such as magma stratigraphic lithology fold fault, this paper determines that the NNW-trending fault is the main fluid channel, and it is East and west sides are 20 to 70 meters. The Cambrian Huangdongkou formation limestone interlayer can form a layered skarn-type ore body. Based on this, three ore sections are divided from east to west. A new section was successfully discovered in the west of the mine after drilling verification. This metallogenic prediction has changed the previous thinking of tracing the nearly EW-trending limestone to tracing the layered ore body along the NNW-trending fault (joint) and has given a positive evaluation to a deposit that has been negated by the predecessors and achieved success. This understanding and experience can be used for reference in the metallogenic prediction of magmatic-hydrothermal deposits controlled by multiple factors in complex fold areas.

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备注/Memo

备注/Memo:
收稿日期: 2021-02-22; 改回日期: 2021-07-18
项目资助:国家重点基础研究发展计划(973 计划)“课题改造型花岗岩钨锡稀有金属成矿作用”(2012CB416704)、中国地质调查局地质调查二级项目“浙闽粤火山岩区铜金矿产地质调查”(DD20201173)和广西壮族自治区部门前期地质勘查项目“广西大瑶山地区多期次岩浆活动及成矿作用研究”(桂地矿地[2014]17 号)共同资助。
第一作者简介: 陈港(1997-), 男, 博士研究生, 矿物学岩石学矿床学专业。E-mail: cccg0105@163.com
通信作者: 陈懋弘(1971-), 男, 研究员, 博导, 主要从事矿床学及构造地质学研究。E-mail: mhchen666@163.com
更新日期/Last Update: 2022-01-17