衡阳盆地西北缘物化探特征及其找矿意义

doi:10.11720/wtyht.2021.1332

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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 words： northwestern 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

Received: 01 July 2020 Published: 15 December 2021

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	Yun-Tao CHEN
	Jun-Feng LIU
	Chuang-Hua CAO
	Dang WANG

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Yun-Tao CHEN,Jun-Feng LIU,Chuang-Hua CAO, et al. Ore prospecting on northwestern margin of Hengyang Basin using geophysical and geochemical information[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1189-1195.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1332 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I5/1189

The geological map of the northwestern margin in Hengyang Basin
1—Paleogene;2—upper Cretaceous;3—lower Cretaceous;4—lower Jurassic;5—Triassic system;6—Permian system;7—Carboniferous system;8—upper Devonian;9—middle Devonian;10—Ordovician system;11—Cambrian system;12—diabase;13—Sinian system;14—south China series;15—Qingbaikou system;16—hornstone and schist xenoliths;17—lamprophyres;18—Cretaceous fine-grained micaceous monzonite granites;19—fine-grained micaceous monzonite;20—fine-grained biotite adamellite;21—medium-grained porphyritic biotite monzonite granite;22—medium-grained porphyritic dimica monzonite granite;23—coarse grained porphyritic dimicaceous monzonite granite;24—medium-grained porphyritic biotite monzonite granite;25—coarse grained porphyritic biotite granite;26—Silurian monzonite adamellite;27—fault structure;28—unconformity boundary;29—geophysical and geochemical profile

Measurement results of physical parameters of rock (ore) samples in survey area

The results of soil analysis

R—clustered tree map

Composite geophysical and geochemical profile of the northwestern margin in Hengyang Basin

The contrast chart of WFEM and CSAMT sounding apparent resistivity in 13200 point

The integrated profile of IP sounding of the northwestern margin in Hengyang Basin

The metallogenetic model of changshou-shuangpai deep and large fault zone

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