四川红泥坡铜矿床三维地质建模及控矿构造演化的新认识

doi:10.19657/j.geoscience.1000-8527.2020.03.16

现代地质 ›› 2020, Vol. 34 ›› Issue (03): 598-608.DOI: 10.19657/j.geoscience.1000-8527.2020.03.16

四川红泥坡铜矿床三维地质建模及控矿构造演化的新认识

杨旺东¹(), 高福磊², 王功文¹(), 庞振山³, 沈和明⁴, 龚灵明⁴, 申红涛⁴, 张智强¹, 刘晓宁¹

1.中国地质大学(北京) 地球科学与资源学院,北京 100083
2.山东黄金新城矿业有限公司,山东莱州 261400
3.中国地质调查局发展研究中心,北京 100037
4.四川省地质矿产勘探开发局四〇三地质队,四川峨眉 614200

收稿日期:2020-01-20 修回日期:2020-03-06 出版日期:2020-07-04 发布日期:2020-07-05
通讯作者: 王功文
作者简介:王功文,男,教授,博士生导师,1972年出生,矿产普查与勘探专业,从事三维地质建模与资源定量评价工作。Email: gwwang@cugb.edu.cn。
杨旺东,男,硕士研究生,1995年出生,矿产普查与勘探专业,从事矿床三维地质建模与资源定量评价工作。Email: 757344688@qq.com。
基金资助:
中国地质调查局项目(DD2019057020)

3D Geological Modeling and New Understanding of Ore-controlling Tectonic Evolution of the Hongnipo Copper Deposit in Sichuan Province

YANG Wangdong¹(), GAO Fulei², WANG Gongwen¹(), PANG Zhenshan³, SHEN Heming⁴, GONG Lingming⁴, SHEN Hongtao⁴, ZHANG Zhiqiang¹, LIU Xiaoning¹

1. School of Earth Sciences and Resources,China University of Geosciences, Beijing 100083, China
2. Shandong Gold Xincheng Mining Co., Ltd., Laizhou, Shandong 261400, China
3. Development and Research Center of China Geology Survey, Beijing 100037, China
4. No.403 Geological Team, Sichuan Bureau of Geological and Mineral Exploration and Development, E’meishan, Sichuan 614200, China

Received:2020-01-20 Revised:2020-03-06 Online:2020-07-04 Published:2020-07-05
Contact: WANG Gongwen

摘要/Abstract

摘要：

红泥坡铜矿是近年来在四川拉拉地区发现的一个大型铜矿床,其包含铜储量64.2万t,平均品位1.31%。矿体赋存于元古宙老的褶皱基底河口群,与辉长岩侵入体具有时间上的联系,围岩发生了普遍的钠质蚀变。通过红泥坡铜矿区224个钻孔和23条勘探剖面建立了矿体、地层与构造要素的三维模型,该三维地质模型能够表达矿床的精细地质结构以及解释区域成矿作用与构造演化:矿区早期的南北向主应力使河口群形成轴向近东西向的大型向斜,晚期的东西向主应力在改造早期褶皱基底的基础上,形成了叠加在其之上的轴向北北东向的复向斜。经过两期主要的构造运动,该地区形成了现在北北东向与北西西向构造相叠加的格架。本项研究为拉拉地区的矿床学研究提供了新的思路,并能对该地区矿产勘查提供科学依据。

关键词: 红泥坡铜矿床, 三维地质模型, 构造演化, 构造格架, 矿产勘查

Abstract:

The Hongnipo copper deposit is a newly discovered large copper deposit in the Lala region of Sichuan Province, which contains reserves of 642,000 tons Cu with an average grade of 1.31%. Ore bodies are hosted in the Proterozoic fold basement Hekou Group and they have a temporal association with gabbro intrusions, the host rocks have a generally sodic alteration. In this paper, a three-dimensional model of ore bodies and strata is constructed using 224 boreholes and 23 cross sections in the study area. The 3D geological model can delineate fine geological structure of the deposit and explain the regional metallogenesis and tectonic evolution: the early N-S principal stress in the mining area caused the Hekou Group to form a large syncline near E-W direction. On the basis of the reconstruction of the early fold basement, an axial NNE synclinorium superposed on it was formed under the late E-W principal stress. After two-stage major tectonic movements, the area has formed an overlay frame of NNE-SSW and NWW-SEE structures. This study provides new ideas for the research of mineral deposits in the Lala region, and can provide scientific guidance for mineral exploration in the region.

Key words: the Hongnipo copper deposit, 3D geological modeling, tectonic evolution, structural grid, mineral exploration

中图分类号:

P618.41
P624

杨旺东, 高福磊, 王功文, 庞振山, 沈和明, 龚灵明, 申红涛, 张智强, 刘晓宁. 四川红泥坡铜矿床三维地质建模及控矿构造演化的新认识[J]. 现代地质, 2020, 34(03): 598-608.

YANG Wangdong, GAO Fulei, WANG Gongwen, PANG Zhenshan, SHEN Heming, GONG Lingming, SHEN Hongtao, ZHANG Zhiqiang, LIU Xiaoning. 3D Geological Modeling and New Understanding of Ore-controlling Tectonic Evolution of the Hongnipo Copper Deposit in Sichuan Province[J]. Geoscience, 2020, 34(03): 598-608.

图/表 11

图1 研究区在扬子板块中所处的大地构造位置简图(a)和康滇铜矿带区域地质图(b)(修改自Chen and Zhou[14],2012)

Fig.1 Simplified tectonic map showing the study area in the Yangze Block(a) and regional geological map of the Kangdian copper belt showing the distribution of the major Cu-Fe deposits(b) (modified after Chen and Zhou[14],2012 )

图2 拉拉矿田区域地质图

Fig.2 Regional geological map of the Lala ore camp

图3 河口群地层柱状图(据陈辉,未发表资料)

Fig.3 Stratigraphic column of the Hekou Group (after Chen Hui,unpublished data)

图4 红泥坡矿区地质图(a)和 P-3线剖面图(b)

Fig.4 Geological map of the Hongnipo mining area(a) and profile of the prospect line P-3(b)

图5 红泥坡矿区勘探线在地表分布图(a)和地表与钻孔三维模型(b)

Fig.5 Distribution of the prospect lines on the surface(a) and 3D model of the surface and drill holes of the Hongnipo mining area(b)

图6 红泥坡矿区地质体三维模型 a, d.1号矿体;b.2号矿体;c.大理岩侵入体;e.辉长岩侵入体; f.1、2号矿体叠加展示 ;g.辉长岩、大理岩侵入体叠加展示;h.矿体与侵入体的接触关系 ;i.矿体的埋深。

Fig.6 3D model of geological bodies of the Hongnipo mining area

图7 红泥坡矿区地层三维模型 a.总体地层模型; b.总体地层模型切片展示。

Fig.7 3D stratigraphic model of the Hongnipo mining area

图8 红泥坡矿区精细地层模型

Fig.8 Fine stratigraphic model of the Hongnipo mining area

图9 拉拉矿田AMT三维模型 a.原始剖面点数据分布图; b, c.AMT三维块体模型; d.AA’剖面图;a, b中的AMT资料据自然资源部中国地质调查局勘查技术指导中心2018年度报告资料;c据中国地质大学(北京)王功文团队2018年度报告。

Fig.9 3D model of AMT of the Lala ore camp

图10 拉拉矿田构造格架图(修改自周家云等[16],2008)

Fig.10 Tectonic frame of the Lala ore camp (modified after Zhou et al.[16],2008)

图11 红泥坡地层演化图 a, b.早期构造变形时地层及应力状态;c, d.晚期构造变形时地层及应力状态;e, f.现在的地层。

Fig.11 Stratigraphic evolution map of the Hongnipo area

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四川红泥坡铜矿床三维地质建模及控矿构造演化的新认识

3D Geological Modeling and New Understanding of Ore-controlling Tectonic Evolution of the Hongnipo Copper Deposit in Sichuan Province

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