基于重磁场特征的新蔡铁矿区构造单元分布特征

doi:10.11720/wtyht.2020.0064

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Abstract

The Xincai iron ore district is located in the southeast of Wuyang Xincai iron ore metallogenic belt in Henan Province. It is covered with thick Cenozoic strata. The magnetite orebody mainly occurs in the Archean Taihua Group. Due to the underutilization of large-scale geophysical data and other reasons, the division of structural units in the area remains in the result of small-scale division, which restricts the deep exploration breakthrough in this area. In this paper, through the processing and interpretation of large-scale gravity and magnetic data, the spatial distribution characteristics of fault structures and strata in the area were studied. The study shows that there are six main faults in the Xincai iron ore district, which strike NW and NE, and control the basement structural framework; the basement depression area is V-shaped, and the center and both sides of V-shaped are the basement uplift areas. Among the structures, Chendian uplift and Liancun fanghudian uplift were caused by Archean Taihua rock group. The study of magnetic anomalies in this area will help to realize the deep iron ore prospecting breakthrough and hence is of great significance.

Key words： Xincai iron ore district gravity and magnetic anomalies fault detection tectonic unit

Received: 14 February 2020 Published: 28 August 2020

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	Lei ZHANG
	Wan-Yin WANG
	Xiu-Jun ZHAO
	Yi-Mi ZHANG

Cite this article:

Lei ZHANG,Wan-Yin WANG,Xiu-Jun ZHAO, et al. Distribution characteristics of structural units in Xincai iron ore area based on gravity and magnetic field characteristics[J]. Geophysical and Geochemical Exploration, 2020, 44(4): 975-984.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.0064 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I4/975

Geological Sketch of the study area (Geological Bureau of Henan Province, 1978)

Statistical table of main strata and mineral density in the study area10³ kg/m³

Magnetic statistics of strata and main rocks and ores in the study area10^-5SI(κ)

Bouguer gravity anomaly and geological superposition map of the study area

Geochemical magnetic anomaly and geological superposition map of the study area

Superposition of gravity anomaly NVDR-THDR and fault detectio of the study area

Superposition of chemical polar magnetic anomaly NVDR-THDR and fault detection of the study area

断裂编号	断裂名称	断裂特征
F1	寒冻—殷围孜断裂	该断裂位于研究区西部,沿寒冻—殷围孜—汝南埠一线展布,整体走向NW,其间在汝南埠附近被F5断裂错断。F1断裂位于重力异常梯度带上。F1断裂东北侧为陈店异常高区。在重力异常NVDRTHDR图上显示为断裂与信号的极大值有明显的对应关系
F2	涧头—张里店断裂	该断裂位于研究区东部,沿涧头—张里店一线展布,呈S形贯穿工作区南北,该断层为正断层,是研究区内的主要断裂构造之一。F2断裂位于重力异常梯度带上,东侧为练村—防胡店异常高区;在重(磁)力异常NVDR-THDR图上显示为断裂与信号的极大值有明显的对应关系
F3	王勿桥断裂	该断裂位于研究区的西南角,位于王勿桥西南,走向NW,该断裂为研究区主要断裂之一, F3断裂位于重力异常梯度带上
F4	砖店—关津断裂	该断裂位于研究区的北部,沿砖店—关津一线展布,走向NW,该断裂为研究区内的主要断裂之一。F4断裂位于重力异常梯度带上,西南侧为陈店异常高区;在重(磁)力异常NVDR-THDR图上显示为断裂与信号的极大值有明显的对应关系
F5	佛阁寺—雷寨断裂	该断裂位于研究区的中部,沿佛阁寺—汝南埠—雷寨一线展布,走向近EN,该断裂为研究区内的主要断裂之一,为本次研究发现的新断裂。F5断裂形成时期较F1断裂晚,在后期构造运动中,将F1断裂错断。F5断裂位于重力异常梯度带上,西北侧为陈店异常高区;在重力异常NVDR-THDR图上显示为断裂与信号的极大值有明显的对应关系
F6	关津断裂	该断裂位于研究区中部,走向NE,在关津附近,断裂走向发生改变,向正北方向延伸,该断裂为研究区内的主要断裂之一。F6断裂位于重力异常梯度带上,西北侧为陈店异常高区,与F5断裂基本平行;在重(磁)力异常NVDR-THDR图上显示为断裂与信号的极大值有明显的对应关系

Analysis of main fracture characteristics in the study area

Geological map of bedrock revised this time

Schematic diagram of inversion profile location

Inferred bathymetric map of Neoarchaean dome

Distribution of basement bulges and depressions by predecessors (MA Zhenbo et al., 2013)

distribution of basement bulge and depression

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