基于重磁场特征的新蔡铁矿区构造单元分布特征  

Distribution characteristics of structural units in Xincai iron ore area based on gravity and magnetic field characteristics

作　　者：张磊[1,2,3] 王万银[2,3] 赵修军 张义蜜[2,3] ZHANG Lei;WANG Wan-Yin;ZHAO Xiu-Jun;ZHANG Yi-Mi(Aero Geophysical and Remote Sensing Center of Henan Province,Zhengzhou 450053,China;Institute of Gravity and Magnetic Technology,Chang'an University,Xi'an 710054,China;College of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China)

机构地区：[1]河南省航空物探遥感中心,河南郑州450053 [2]长安大学重磁方法技术研究所,陕西西安710054 [3]长安大学地质工程与测绘学院,陕西西安710054

出　　处：《物探与化探》2020年第4期975-984,共10页Geophysical and Geochemical Exploration

基　　金：中国地质调查局项目“河南舞阳新蔡铁矿整装勘查区1∶5万区域地质综合调查”(12120113061100);河南省2009年度地质勘查基金项目(豫财招标采购〔2010〕736号)。

摘　　要：新蔡铁矿区位于河南省舞阳—新蔡铁矿成矿带的东南部,属新生界厚覆盖区,磁铁矿体主要赋存于太古宇太华岩群地层中,由于大比例尺地球物理资料未得到充分利用等原因,导致区内构造单元划分仍停留在小比例尺的划分结果上,制约了本区深部找矿突破。本文通过大比例尺重、磁资料的处理和解释,研究区内断裂构造、地层空间分布特征。研究认为:新蔡铁矿区主要断裂走向为NW向和NE向,控制基底构造格架;基底凹陷区域呈"V"字形,其中心及两侧为基底凸起区域,其中陈店凸起、练村—防胡店凸起为太古宇太华岩群引起。该研究成果对于实现深部找矿突破具有重要意义。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.

关 键 词：新蔡铁矿区 重磁异常 断裂 构造单元 

分 类 号：P631[天文地球—地质矿产勘探]