南秦岭汉阴北部金矿田控矿要素研究及找矿方向建议

高雅宁; 杨兴科; 杨龙伟; 韩珂

南秦岭汉阴北部金矿田控矿要素研究及找矿方向建议

高雅宁^1,,
杨兴科^{1, 2},
杨龙伟¹,
韩珂¹

1.
长安大学地球科学与资源学院, 西安 710054
2.
长安大学西部矿产资源与地质工程教育部重点实验室, 西安 710054

基金项目:

中国地质调查局地质调查项目"陕西石泉—旬阳金矿整装勘查区关键基础地质研究" 12120114014201

陕西省自然科学基金项目 2016JM4001

详细信息

作者简介:
高雅宁(1984-), 男, 陕西榆林人, 博士研究生, 研究方向为矿产普查与勘探。E-mail:gaoyaning2000@163.com

中图分类号: P618.51
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出版历程
- 收稿日期: 2015-10-12
- 刊出日期: 2016-06-01

STUDY ON ORE-CONTROLLING FACTORS AND MINE EXPLORATION PROPOSAL OF THE GOLD ORE FIELD IN NORTH HANYIN, SOUTH QINLING

1.
School of Earth Science and Resources, Chang'an University, Xi'an 710054, China
2.
Key Laboratory of Western Mineral Resource and Geological Engineering Ministry of Education, Xi'an 710054, China

摘要

摘要: 选取南秦岭汉阴北部金矿田内黄龙、长沟和金斗坡典型矿区为研究区，通过野外大比例尺构造-岩相填图、剖面实测、综合编图等工作，结合前人研究成果，查明了金矿田的控矿要素，并指出了有利的找矿勘探方向。综合研究表明，汉阴北部金矿田的矿化严格受控于志留系梅子垭组的不同岩性段；脆-韧性剪切带控制了矿床的空间分布，次级断层控制矿体产出的具体部位；S₂面理对金矿化有显著的制约作用；促使石榴子石和黑云母变斑晶发育的热变质作用能够引起原始岩层中金元素发生活化，且热变质作用的晚期为退变质期，退变质期的适宜温度有利于金元素富集成矿。矿田内的金矿勘探应重点选在脆-韧性剪切带内，尤其针对不同岩性的接触面、次级断层面附近、石榴子石与黑云母变斑晶密集发育区周缘等区域，矿体追索方向应依照S₂面理的空间优势展布方向。
- 南秦岭 /
- 金矿田 /
- S₂面理 /
- 控矿要素 /
- 找矿方向
Abstract: Taking Huanglong, Changgou and Jindoupo gold ore areas located in Northern Hanyin ore field, Southern Qinling as the typical study area, through the large-scale tectonic lithofacies mapping, measuring geologic section and complex map compilation, the ore-controlling factors of this ore-field has eventually been acquired which would provide the directions of gold exploration based on previous research results. Comprehensive analysis shows that gold mineralization of this field is bound up with Silurian Meiziya Group stratum, and the brittle-plastic shear zone restricts the spatial distribution of gold deposits, and the locations of the ore bodies are decided by the secondary faults. S₂ structural foliation obviously controls the gold mineralization, and the thermometamorphism which develops biotite and garnet porphyroblasts can cause the gold element to reactivate. And in the late stage it is the retrograde metamorphism period during which the temperature is very available for the form of gold deposits. Therefore the gold exploration in this area should be focus on the brittle-plastic shear zones in the future, especially the positions of those connection of different rock layer, the region near the secondary faults, and the scopes where biotite and garnet porphyroblasts massively appear. Meanwhile the direction of gold seeking should follow the main spatial distribution direction of S₂ foliation.
- South Qinling /
- the gold ore field /
- S₂ structural foliation /
- the ore-controlling factors /
- gold exploring direction

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图 1 南秦岭汉阴北部金矿田区域地质图(据文献[8~11]修编)

Figure 1. Regional geological map of gold ore field in North Hanyin, South Qinling

下载: 全尺寸图片幻灯片

图 2 黄龙矿区平硐864实测剖面图

1—变石英砂岩；2—绢云母石英片岩；3—含黑云母变斑晶绢云石英片岩；4—含炭、黑云母变斑晶绢云石英片岩；5—性质不明断层；6—逆断层；7—岩层界线；8—石英脉；9—黄铁矿化；10—褐铁矿化；11—Au矿化体；12—片岩S₂面理产状及断层面产状；13—脆-韧性剪切带及编号；14—剖面分层号

Figure 2. Measured geologic section of 864 Adit in Huanglong gold deposit

下载: 全尺寸图片幻灯片

图 3 长沟矿区28勘探线剖面图

1—变石英砂岩；2—绢云母石英片岩；3—含黑云母变斑晶绢云石英片岩；4—含炭、黑云母变斑晶绢云石英片岩；5—含石榴子石绢云石英片岩；6—断层破碎带；7—花岗闪长岩脉；8—石英脉；9—黄铁矿化；10—褐铁矿化；11—Au矿化；12—片岩S₂面理产状及岩脉产状；13—脆-韧性剪切带及编号；14—钻孔及编号

Figure 3. Geologic section of No.28 exploration line in Changgou gold deposit

下载: 全尺寸图片幻灯片

图 4 金斗坡矿区面理置换现象

a—S₁被S₂置换；b—S₂被S₃置换(黑云母变斑晶Bit沿S₂片理定向排列)

Figure 4. The exchange of structural foliation in Jindoupo mine area

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图 5 黄龙金矿金沟矿段465中段矿体与S₂面理展布特征

1—勘探线及编号；2—坑探工程；3—矿体大致边界；4—平移断层；5—S₂面理；6—S₂面理产状；7—产状；8—钻孔及编号；Ⅰ—平移断层内黄钾铁矾化；Ⅱ—顺S₂面理发育黄铁矿(Py)细脉；Ⅲ—S₂褶曲变形强烈，其产状发生偏转；Ⅳ—S₃面理(劈理)截切S₂面理

Figure 5. Characteristics of the ore-bodies and S₂ structural foliation in the middle part of 465 in Jingou section, Huanglong gold deposit

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图 6 金斗坡矿区S₂面理展布方向与金矿(化)体分布特征

1—S₂面理展布方向；2—金矿体；3—矿化带；4—S₂面理产状；5—含石榴子石密集带；6—梅子垭组变质岩

Figure 6. Direction of S₂ structural foliation and distribution characteristics of ore-bodies in Jindoupo area

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图 7 长沟矿区S₂面理展布方向与金矿体分布特征

1—S₂面理展布方向；2—金矿体；3—强变形带；4—S₂面理产状；5—含石榴子石密集带；6—石英脉或透镜体；7—梅子垭组变质岩

Figure 7. Direction of S₂ structural foliation and distribution characteristics of ore-bodies in Changgou area

下载: 全尺寸图片幻灯片

图 8 金斗坡矿区石榴子石-黑云母共生矿物组合显微照片(Gar为石榴子石，Bi为黑云母)

The micrograph of biotite-garnet in Jindoupo gold deposit

Figure 8. Direction of S₂ structural foliation and distribution characteristics of ore-bodies in Changgou area

下载: 全尺寸图片幻灯片

表 1 典型金矿区矿体特征

Table 1. Characteristics of ore-bodies in the typical gold mine areas

矿区	矿体编号	矿体形态	矿体长度/m	矿体厚度/m	平均品位/10^-6	矿体产状	主要矿石类型
金斗坡	K1	透镜状	500	1.00~2.97	1.30	280°—330°∠29°—43°	黑云母变斑晶绢云石英片岩含炭绢云石英片岩
	K2	似层状	250	1.90~2.74	1.18
	K3	似层状	250	1.90~3.95	1.13
黄龙	Ⅲ	似层状	150	1.00~6.31	5.60	5°—22°∠20°—55°	黑云母变斑晶绢云石英片岩含炭绢云石英片岩
	Ⅳ	似层状	500	0.80~7.14	3.15
	Ⅷ-1	似层状	200	0.97~1.84	4.01
长沟	K1	似层状	460	0.85~3.80	1.54	190°—220°∠35°—55°	黑云母变斑晶绢云石英片岩含炭绢云石英片岩夹变石英砂岩含金石英脉
	K2	似层状	190	0.95~4.45	1.52	190°—220°∠35°—55°
	K4	似层状	1100	0.85~4.35	2.60	15°—35°∠40°—70°
注：部分资料据文献[10]

下载: 导出CSV

表 2 不同类型变质作用阶段划分及矿物生长序列^[7]

Table 2. Dividing of different phases on metamorphism and the order of mineral development

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