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黄金科学技术 ›› 2020, Vol. 28 ›› Issue (1): 12-20.doi: 10.11872/j.issn.1005-2518.2020.01.158

• 矿产勘查与资源评价 • 上一篇    下一篇

广西大瑶山大裕金矿地质特征及找矿预测

郭辉1,2(),刘春明2(),黄德志2,邹海洋2,陈磊2,3   

  1. 1.湖南省煤炭地质勘查院,湖南 长沙 410014
    2.中南大学地球科学与信息物理学院,湖南 长沙 410083
    3.湖南省地震局,湖南 长沙 410004
  • 收稿日期:2019-08-10 修回日期:2019-10-29 出版日期:2020-02-29 发布日期:2020-02-26
  • 通讯作者: 刘春明 E-mail:17374990@qq.com;lifuming001@163.com
  • 作者简介:郭辉(1990-),男,湖南郴州人,硕士研究生,从事地质勘查及矿床学研究工作。17374990@qq.com
  • 基金资助:
    湖南省自然科学基金项目“Ex/Hy广域电磁方法与技术研究”(2015JJ2151)

Geological Characteristics and Prospecting Prognosis of the Dayu Gold Deposit in Dayaoshan,Guangxi

Hui GUO1,2(),Chunming LIU2(),Dezhi HUANG2,Haiyang ZOU2,Lei CHEN2,3   

  1. 1.The Coal Geological Exploration Institute of Hunan Province,Changsha 410014,Hunan,China
    2.School of Geosciences and Info-Physics,Central South University,Changsha 410083,Hunan,China
    3.Hunan Seismological Bureau,Changsha 410004,Hunan,China
  • Received:2019-08-10 Revised:2019-10-29 Online:2020-02-29 Published:2020-02-26
  • Contact: Chunming LIU E-mail:17374990@qq.com;lifuming001@163.com

摘要:

大裕金矿位于广西大瑶山成矿带的古袍成矿区带,构造单元属于桂中—桂东台陷大瑶山凸起东端古袍复式向斜南翼,矿区成矿地质条件优越,但由于对成矿规律认识不足,该区找矿工作推进缓慢。选取成矿带内典型的大裕金矿为例,在总结成矿地质特征的基础上,结合钻孔资料及镜下矿石特征,分析了该区金成矿的控矿因素和成矿规律,认为该区主要控矿构造为NEE向F1和F2断裂,赋矿围岩为寒武系小内冲组和黄洞口组浅变质含炭质细碎屑岩,矿化蚀变主要为硅化—黄铁矿化和绢云母化—黄铁矿化—硅化组合蚀变。研究提出该区今后找矿应结合物化探工作,重点找矿方向有:①关注与金成矿关系密切的硅化、黄铁矿化、绢云母(水云母)化及绿泥石化等围岩蚀变线索;②建议在NE-NEE向断裂及其所挟持部位和断裂交会部位开展找矿工作。

关键词: 地质特征, 找矿预测, 成矿规律, 大裕金矿, 大瑶山金成矿带, 广西

Abstract:

Dayu gold deposit is located in the Gupao metallogenic zone of the Dayaoshan metallogenic belt in Guangxi Province.The structural unit belongs to the Guizhong-Guidong platform depression,east part of Dayaoshan uplift,south part of Gupao compound syncline,where is favorable for mineralization.However,the prospecting work in this area has been restricted by the insufficient understanding of metallogenic regularity.In this paper,we studied the Dayu deposit as a typical deposit in the metallogenic belt.Based on the detailed analysis of the geological characteristics of the gold deposit,combined with the drilling data and the microscopic characteristics of the ore,the ore-controlling factors and metallogenic regularities of the gold mineralization in this area were analyzed.The main ore-controlling structures in this area are NEE-trending faults,F1 and F2,and the ore-bearing wall rocks are the Cambrian Xiaoneichong Formation and Huangdongkou Formation,which are mainly composed of shallow metamorphic carbonaceous fine clastic rocks.Wall rock alteration mainly includes silicification and pyritization or sericitization-pyritization-silicification combination alteration.It is suggested that the future gold prospecting works in this area should combine geophysical and geochemical exploration work,and it is necessary to pay attention to silicification,pyritization,sericite,hydromica,chlorite and other wall rock alteration that closely related to gold mineralization.It is proposed to carry out prospecting work at NE-NEE trending faults and its restricted areas as well as intersecting parts.

Key words: geological characteristics, prospecting prognosis, metallogenic regularity, Dayu gold deposit, Dayaoshan gold metallogenic belt, Guangxi

中图分类号: 

  • P618.51

图1

大瑶山地区综合地质简图[8]①-大宁断裂;②-凭祥—大黎断裂;③-荔浦断裂;④-姑婆山断裂;⑤-富川断裂;⑥-栗木断裂;⑦-昭平断裂;⑧-都庞岭断裂;1.古近系;2.白垩系;3.石炭系;4.泥盆系;5.寒武系;6.震旦系;7.花岗闪长岩;8.花岗岩;9.酸性—中酸性小岩体;10.深大断裂(或大断裂)及编号;11.一般断裂;12.中型矿床;13.小型矿床;14.矿点;15.工作区范围"

图2

大裕金矿地质简图1.寒武系黄洞口组第一段;2.寒武系小内冲组;3.断层及编号;4.地质界线;5.矿体/隐伏矿体及编号;6.矿带分带位置;7.勘探线及编号"

图3

大裕金矿0号勘探线剖面图1.第四系;2.寒武系黄洞口组第一段;3.寒武系小内冲组;4.第四系残坡积物;5.细砂岩;6.板岩;7.石英脉;8.破碎带;9.实测/推测构造破碎带及编号;10.氧化带界线;11.矿体及编号;12.矿化体;13.完工钻孔及编号"

表1

大裕金矿中带金矿体地质特征"

矿体

编号

矿体

形态

矿体产状/(°)矿体规模/m平均真厚度/m厚度变化系数/%平均品位/(×10-6控制勘探线金资源量/kg
倾向倾角走向长最大斜深
Ⅰ-1似层状172652601774.19113.510.367~2线3 550.20
Ⅰ-2似层状172532201572.6416.03.9312~20线
Ⅱ-1似层状172653803255.10166.35.0715~0线2 821.04
Ⅱ-2似层状172532203591.3611.83.2312~20线
似层状172527602281.00158.67.1315~20线1 580.04
透镜状172524002031.01206.71.950~20线116.43
Ⅴ-1透镜状172522603681.55-2.380~7线
Ⅴ-2透镜状172522203051.09-4.0712~20线
Ⅵ-1豆荚状1725240501.91-5.287线
Ⅵ-2豆荚状1725240501.89-3.520线
Ⅵ-3豆荚状1725240501.26-6.1020线
Ⅶ-1透镜状17252240500.73-5.597~2线
Ⅶ-2透镜状1725240501.26-4.5320线

图4

大裕金矿矿石显微镜下特征(a)孤岛状黄铁矿被褐铁矿化交代残余;(b)闪锌矿呈他形粒状;(c)顺石英脉生长的长条形黄铁矿;(d)石英交代自形黄铁矿呈骸晶结构;(e)石英脉中分布的黄铜矿包含黝铜矿;(f)石英脉中黝铜矿包含乳滴状黄铜矿和粒状黄铜矿Ccp-黄铜矿;Lm-褐铁矿;Py-黄铁矿;Qtz-石英;Sp-闪锌矿;Tet-黝铜矿"

图5

大裕金矿围岩蚀变及其显微特征(a)含矿石英脉碎裂岩中绢云母化;(b)灰黑色长石石英细砂岩中绢云母化;(c)含炭质较高的破碎带中黄铁矿晕边;(d)含炭质较高的破碎带中他形浸染脉状黄铁矿;Ser-绢云母;Ccp-辉铜矿;Py-黄铁矿;Qtz-石英"

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