河南内黄—浚县一带重磁异常与深部磁铁矿靶区预测研究

doi:10.11720/wtyht.2019.0134

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Abstract

The Neihuang-Xunxian area in Henan Province is located in the Archaean basement uplift area, and has good gravity and magnetic anomalies. It has favorable conditions in the search for sedimentary metamorphic magnetite deposits. However, since the 1970s, due to the limitations of shallow prospecting knowledge, no breakthrough has been made in prospecting. Aimed at the target area of deep magnetite prospecting, the authors detected the plane position (center and boundary) of the concealed magnets in the study area by central recognition technology (analytical signal amplitude ASM) and edge recognition technology (NVDR-THDR), obtained the burial information of the concealed magnets in the study area by Euler deconvolution, and analyzed the homologous characteristics of gravity and magnetic anomalies in the study area by correlation coefficient. Combined with known boreholes, 2.5D fitting inversion of key magnetic anomalies in the study area was carried out, and the scale and spatial distribution characteristics of the concealed magnets were determined. The results show that the buried depth of the concealed magnets corresponding to the main magnetic anomalies is 500~1 200 m, and the ore-bearing property in the deep part is better than that in the shallow part, so the prospecting potential in the deep part is great. On the basis of comprehensive geological and mineral conditions, two deep prospecting target areas of Wagang-Yujian and Nanzhangbao magnetite ores were delineated. It is suggested that they should be the key directions in further deep prospecting with the purpose of achieving a breakthrough in deep prospecting in this area as soon as possible.

Key words： Neihuang-Xunxian area of Henan Province gravity and magnetic anomalies magnetite deep prospecting target area

Received: 13 March 2019 Published: 28 November 2019

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	Hao SONG
	Yi-Mi ZHANG
	Wan-Yin WANG

Cite this article:

Hao SONG,Yi-Mi ZHANG,Wan-Yin WANG. The research on the prediction of gravity and magnetic anomalies and deep magnetite target areas in the Neihuang-Xunxian area of Henan Province[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1191-1204.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0134 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1191

Geotectonic location map of the study area (according to regional geological records of Henan Province)

Geological map of bedrock in study area
1-Cretaceous;2-Pingdingshan formation;3-upper Shihezi formation and lower Shihezi formation;4-Shanxi formation and Taiyuan formation;5-Benxi formation;6-Majiagou formation;7-Sanshanzi formation, Tiexiangou formation and Bailongmiao formation;8- Ordovician system is not divided;9-Zhangxia formation, Zhushadong formation and Xinji formation;10-Mantou formation;11-the Cambrian system is not divided;12-Archaean;13-survey and estimation of geological boundary;14-measurement and speculation of unconformity contact geological boundary;15-measurements and predictions of normal faults;16-measurements and predictions of reverse faults;17-faults of unknown nature measured and speculated;18-scope of study area

Survey area stratigraphic magnetic statistics table

Survey area stratigraphic density statistics table

Plane maps of polarized magnetic anomalies (a) and residual magnetic anomalies (b) in the study area

List of major magnetic anomaly features in the study area

Plane maps of Bouguer gravity anomaly (a) and residual gravity anomaly (b) in the study area

Anomaly map of analytical signal amplitude (ASM) of polarized magnetic anomaly in study area

Normalized Total Horizontal Derivative Vertical Derivative (NVDR-THDR) Diagram of Polar Magnetic Anomalies in the Study Area

Euler deconvolution for source depth map

Statistical table of inversion depth of magnetic source for key magnetic anomalies

List of Contrasts between Verification of Borehole Depth and Inversion of Magnetic Source Depth

Gravity anomaly and magnetic anomaly correlation coefficient map in the study area
a—vertical first derivative of Bouguer gravity anomaly and correlation coefficient diagram of polarized magnetic anomaly;b—correlation coefficient diagram between vertical first derivative of Bouguer gravity anomaly and residual magnetic anomaly

List of coefficient analysis of concealed magnets

Quantitative interpretation of profile distribution map in research area

Quantitative inversion interpretation map of CK1 profile

A list of the occurrence of sjzk1 borehole

Quantitative interpretation of profiles

Prediction map of deep prospecting target area of magnetite in study area

Characteristic List of Prospecting Targets for Deep Magnetite

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