高精度重磁方法寻找隐伏矽卡岩型铁矿

doi:10.11720/wtyht.2024.1047

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Abstract

The Laiwu area in central Shandong Province, situated in the eastern North China Craton, is a significant production area of skarn iron-rich ores. Its ore deposits occur primarily in the contact zone between the mining rock mass and the Middle Ordovician carbonate formation. Based on the latest areal gravity and magnetic survey results, this study thoroughly investigated the characteristics of gravity and magnetic anomalies along the Shijiaquan-Liujiamiao area in the western periphery of the mine rock mass. Then, this study delineated the deep prospecting target combining the characteristics of gravity and magnetic fields of the known iron deposits in the Laiwu area. Large-scale gravity and magnetic profiles were arranged in the favorable mineralization area. With the known boreholes as constraints, the gravity and magnetic anomalies were qualitatively and quantitatively interpreted using the 2.5D gravity-magnetic joint inversion technique. The interpretation results provide a basis for the location and depth of the borehole to be placed, which revealed a 15.8 m-thick iron-rich ore deposit, suggesting remarkable prospecting effects. This study holds critical indicative significance for further exploration of skarn iron ore deposits in this area.

Key words： Laiwu area Bouguer gravity anomaly aeromagnetic anomaly skarn iron deposit 2.5D gravity-magnetic joint inversion

Received: 06 February 2023 Published: 26 February 2024

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	Articles by authors
	Jian DONG
	Xiao-Peng LI
	Chao FU
	Zhi-Cai DANG
	Xiao-Bo ZHAO
	Qing-Bin ZENG
	Xue-Ping HU
	Jin-Hui WANG

Cite this article:

Jian DONG,Xiao-Peng LI,Chao FU, et al. Prospecting for concealed skarn iron deposits using the high-precision gravity-magnetic survey method[J]. Geophysical and Geochemical Exploration, 2024, 48(1): 31-39.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1047 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I1/31

Geological map of Laiwu area

岩层	密度σ /(10³kg · $m - 3$ )	磁化率κ /(10^-6 ·4πSI)	剩磁J_r /(10^-3A ·m^-1)	物性特征
第四系(黏土)	1.73			低密度、无磁性
石炭—二叠系(砂岩)	2.40			中等密度、无磁性
寒武—奥陶系(灰岩)	2.72			高密度、无磁性
中生代侵入岩 (闪长岩)	2.76	4400	700	高密度、中等磁性
矽卡岩	2.74	5346	8708	高密度、高磁性
磁铁矿	4.0	500000	213000	高密度、强磁性

Physical characteristics of rocks (minerals) in the study area

Bouguer gravity anomly in Laiwu area

Aeromagnetic pole anomaly in Laiwu area

Residual Bouguer gravity anomly in Laiwu area

Vertical second derivative of Bouguer gravity in Laiwu area

The 2.5D combined granity and magnetic inversion inference of the Shijiaquan-Liujiamiao profile

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