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物探与化探  2021, Vol. 45 Issue (5): 1189-1195    DOI: 10.11720/wtyht.2021.1332
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
衡阳盆地西北缘物化探特征及其找矿意义
程云涛1(), 刘俊峰1, 曹创华2, 王荡1
1.湖南省核工业地质调查院,湖南 长沙 410011
2.湖南省地质调查院,湖南 长沙 410016
Ore prospecting on northwestern margin of Hengyang Basin using geophysical and geochemical information
CHEN Yun-Tao1(), LIU Jun-Feng1, CAO Chuang-Hua2, WANG Dang1
1. Hunan Nuclear Industry Geological Survey Institute,Changsha 410011,China
2. Hunan Institute of Geological Survey, Changsha 410116,China
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摘要 

衡阳盆地是华南扬子板块和华夏板块的拼接带,因其复杂的地质构造运动历史造就了其具有丰富的矿产资源潜力。为深入解剖衡阳盆地西北缘地层构架,探讨矿床就位机制,首先利用跨越紫云山岩体和南岳岩体的多方法长剖面进行综合探测,分析了衡阳盆地西北缘盆地结构;其次选择剖面经过重点区段的精测剖面采用激电测深进行大比例尺精细探测,分析了长寿—衡阳—观音阁断裂的激电响应特征,探讨了其成因与成矿远景;最后结合区域地质、重力异常等综合信息研究了此区内的成矿物质运移规律,证实了衡阳盆地属于典型的“亚幔柱—幔枝体系”。

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程云涛
刘俊峰
曹创华
王荡
关键词 衡阳盆地西北缘可控源音频大地电磁法广域电磁测深综合物化探方法亚幔柱—幔枝体系    
Abstract

The Hengyang Basin is a junction zone between the Yangtze Plate in South China and the Cathaysian Plate. It is expected to have great potential for rich mineral resources given its complex geological tectonic movement history. This paper aims to deeply analyze and explore the stratigraphic framework and deposit occurrence mechanisms on the northwestern margin of the Hengyang Basin. To this end, a series of geophysical surveys in this area were carried out. Firstly, a multi-method survey of a long section spanning the Ziyunshan and Nanyue rock masses was conducted and the structure of the northwestern margin of the Hengyang Basin was accordingly analyzed. Secondary, large-scale fine detections of subsections in the key sections/blocks were carried out using induced polarization (IP) sounding. Meanwhile, the characteristics of the IP response of the Changshou-Hengyang-Guanyin’ge fault were analyzed especially, and the genesis and metallogenic prospect of the fault were explored. Finally, the migration rules of ore-forming materials on the margin were investigated based on comprehensive information such as regional geological and gravity anomalies. The combined results confirmed that the Hengyang Basin is a typical sub-mantle plume-mantle branch system.

Key wordsnorthwestern margin of the Hengyang Basin    controlled source audio-frequency magnetotellurics method    wide-field electromagnetic method    comprehensive geophysical and geochemical surveys    sub-mantle plume-mantle branch system
收稿日期: 2020-07-01      出版日期: 2021-12-15
:  P631  
基金资助:湖南省重点领域研发计划项目(2019SK2261);国家重点研发计划“深地资源勘查开采重点专项”(2017YFC0602402);湖南省核工业地质局科技开发项目(KY2019-DDY-01)
作者简介: 程云涛(1982-),男,陕西西安人,高级工程师,长期从事地球物理勘查和技术管理工作。Email: 674395052@qq.com
引用本文:   
程云涛, 刘俊峰, 曹创华, 王荡. 衡阳盆地西北缘物化探特征及其找矿意义[J]. 物探与化探, 2021, 45(5): 1189-1195.
CHEN Yun-Tao, LIU Jun-Feng, CAO Chuang-Hua, WANG Dang. Ore prospecting on northwestern margin of Hengyang Basin using geophysical and geochemical information. Geophysical and Geochemical Exploration, 2021, 45(5): 1189-1195.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.1332      或      https://www.wutanyuhuatan.com/CN/Y2021/V45/I5/1189
Fig.1  衡阳盆地西北缘地质
1—古近系;2—白垩系上统;3—白垩系下统;4—侏罗系下统;5—三叠系;6—二叠系;7—石炭系;8—泥盆系上统;9—泥盆系中统;10—奥陶系;11—寒武系;12—辉绿岩;13—震旦系;14—南华系;15—青白口系;16—角岩、片岩捕掳体;17—煌斑岩;18—白垩系细粒二云母二长花岗岩;19—细粒二云母二长花岗岩;20—细粒黑云母二长花岗岩;21—中粒斑状黑云母二长花岗岩;22—中粒斑状二云母二长花岗岩;23—粗粒斑状二云母二长花岗岩;24—中粒斑状黑云母二长花岗岩;25—粗粒斑状黑云母花岗岩;26—志留系二云母二长花岗岩;27—断裂构造;28—不整合地质界线;29—物化探剖面
岩(矿)石 ρs/(Ω·m) Fs/% κ/(10-54πSI) Jr/(10-3 A·m-1)
花岗岩 3000~5000 1.0~1.2 8~20 2~25
硅质岩 1000~3000 0.7~1.0 1~3 1~4
板岩 500~2000 1.0~1.5 1~3 1~4
粉砂岩 20~180 0.8~1.5 0~2 1~5
断裂带 50~200 2.0~4.5 -2~-8 1~23
Table 1  测区岩(矿)石标本物性参数测量结果
参数 Mn Co Cu Zn Mo Ag Sn Ba W Pb Sb Bi As Hg Au
均值/
10-6
693.78 18.34 42.30 77.74 1.35 0.07 4.97 558.76 5.10 30.93 2.45 0.77 17.04 0.04 1.77
均方差/
10-6
25.43 0.74 3.21 1.43 0.04 0.00 0.09 156.75 0.25 0.98 0.17 0.07 1.83 0.00 0.1
峰度/
10-6
2.71 49.44 53.66 0.46 19.87 9.88 5.70 261.96 9.08 36.23 114.16 236.48 135.93 23.62 31.18
Table 2  土壤分析结果
Fig.2  R型聚类树状图
Fig.3  衡阳盆地西北缘综合物化探剖面
Fig.4  13200号点广域电磁测深与CSAMT测深视电阻率对比
Fig.5  衡阳盆地西北缘激电测深综合剖面
Fig.6  衡阳盆地西缘长寿—双牌深大断裂带控、成矿模式示意
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