凤太矿集区航空地球物理异常特征及找矿方向

doi:10.11720/wtyht.2023.0068

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Abstract

The Fengtai ore concentration area is an important producing area of plumbum-zinc and gold ores in the middle of the Qinling orogenic belt. It hosts many large to super-large deposits, such as Qiandongshan-Dongtangzi, Bafangshan-Erlihe, Baguamiao, and Shuangwang deposits. With the exploitation proceeding, the reserves of these deposits have decreased significantly, and the ore prospecting in these deposits has shifted from the surface to the deep part. However, the geophysical fields in the deposits are yet to be ascertained, severely restricting research on the metallogenic regularity of the deposits and the ore prospecting and exploration in the peripheral zones. Based on the latest 1∶50,000 aeromagnetic and airborne radioactivity survey data, as well as gravity data, this study investigated the multi-source geophysical fields on the scales of the region, the ore concentration area, and deposits, aiming to summarize the distribution patterns of geophysical anomalies of different scales and provide evidence for research on metallogenic regularity and prospecting prediction. The results show that the Fengtai and the Xicheng ore concentration areas, with similar magnetic structures, are separated by the zone with strong magnetic anomalies caused by the crystalline basement of the Huicheng Basin. The first vertical derivative of gravity reveals that the Fengtai and Xicheng ore concentration areas have density structures similar to the Huicheng Basin. It can be inferred that the shallow part is a unified basin and that a large prospecting space exists between the two ore concentration areas. Many NW-trending linear magnetic anomaly zones occur in the Fengtai ore concentration area. Their locations are highly consistent with those of fault structures, and they were offset by NE-trending structures due to late transformation. The second vertical derivative of gravity reveals that many intermediate-acid intrusive stocks or veins have developed in the deep part of the Fengtai ore concentration area. Structural boundaries can be effectively identified based on the first vertical derivative, X-directional derivative, and wavelet transform of aeromagnetic data. Furthermore, ore bodies are mostly distributed in the NW direction along the tectonic belt. All these will play an important role in guiding ore prospecting and exploration in the Fengtai ore concentration area.

Key words： Fengtai ore concentration area aeromagnetic anomaly airborne radioactivity anomaly multi-source geophysics prospecting direction

Received: 15 February 2023 Published: 27 October 2023

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	Xue-Yi XU
	Sheng-Qing XIONG
	Xue YANG
	Wei-Hong GAO
	Zheng-Guo FAN
	Zhi-Ye JIA

Cite this article:

Xue-Yi XU,Sheng-Qing XIONG,Xue YANG, et al. Aerogeophysical anomalies and prospecting direction in the Fengtai ore concentration area[J]. Geophysical and Geochemical Exploration, 2023, 47(5): 1157-1168.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.0068 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I5/1157

26,44]
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The geological background of the study area
a—tectonic framework of Qinling orogenic belt; b—geological map of Fengtai ore concentration area ^[26,44]

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a—aeromagnetic ΔT reduction to the pole (RTP) anomaly; b—first vertical derivate of aeromagnetic ΔT RTP anomaly; c—first vertical derivate of Bouguer gravity anomaly
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Geophysical anomaly feature of Xicheng and Fengtai ore concentration area (ore concentration area referred from Wang et al.^[23])
a—aeromagnetic ΔT reduction to the pole (RTP) anomaly; b—first vertical derivate of aeromagnetic ΔT RTP anomaly; c—first vertical derivate of Bouguer gravity anomaly

Aeromagnetic anomaly feature of Fengtai ore concentration area
a—aeromagnetic ΔT RTP anomaly of Fengtai ore concentration area; b—vertical first order derivative of RTP aeromagnetic ΔT anomaly and inferred fault in Fengtai ore concentration area

Vertical second order derivative of Bouguer gravity anomaly and inferred magmatic rock in Fengtai ore concentration area

Airborn radioactive Kalium content and anticlinorium in Fengtai ore concentration area

Aeromagnetic anomaly feature and distribution of orebodies in Dongtangzi area
a—reduction to pole of aeromagnetic ΔT anomaly map; b—vertical first order derivative of RTP aeromagnetic ΔT anomaly map; c—0° direction derivative of RTP aeromagnetic ΔT anomaly map; d—wavelet transform of aeromagnetic ΔT anomaly map

Magnetic susceptibility of ore body and wall rock in Qiandongshan-Dongtangzi deposit

Aeromagnetic anomaly feature and distribution of orebodies in Bafangshan-Baguamiao area
a—vertical first order derivative of RTP aeromagnetic ΔT anomaly map; b—aeromagnetic ΔT profile map

Prospecting direction of Dongtangzi area (a) and Bafangshan-baguamiao area (b)

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