冀北崇礼-赤城地区逆冲推覆构造特征及地热勘探前景  

Characteristics of thrust nappe structure and geothermal prospect in the Chongli and Chicheng area

作　　者：杨忠彦[1] 朱怀亮[1] 李向宝[1] 邵炳松 郭充[1] 刘志龙[1] 张芬娜[1] 辛玉齐 张钰琪 YANG Zhongyan;ZHU Huailiang;LI Xiangbao;SHAO Bingsong;GUO Chong;LIU Zhilong;ZHANG Fenna;XIN Yuqi;ZHANG Yuqi(Tianjin Geothermal Exploration and Development Designing Institute,Tianjin 300250,China)

机构地区：[1]天津地热勘查开发设计院,天津300250

出　　处：《华北地质》2024年第1期85-93,共9页North China Geology

基　　金：天津市地质矿产勘查开发局项目:“崇礼东部地区地热资源勘探远景调查”(地热院任[2017]08号)。

摘　　要：【研究目的】本文对崇礼—赤城地区隆起山地型带状热储进行了总结,对类似勘探区的地热调查工作具有一定的借鉴作用,可为后续地热资源勘探提供新的依据。【研究方法】通过野外地质调查与详细构造填图,结合可控源音频大地电磁测深(CSAMT)探测结果,分析了崇礼-赤城地区的逆冲推覆构造特征与地热勘探前景。【研究结果】崇礼-赤城地区发育了多种样式的逆冲断层,逆冲断层主要表现为从北向南的逆冲运动方向,在主底板逆冲断层的作用下,太古界、中元古界、白垩系自老向新依次推覆,形成了具有典型逆冲推覆构造分带分层现象。CSAMT剖面测量与解释的初步结果,验证了崇礼-赤城地区发育的逆冲推覆构造,逆冲岩席中发育多条叠瓦式逆冲断层,其断层面向北倾斜,倾角大于60°,向深部汇聚于主底板逆冲断层。【结论】逆冲推覆构造之上发现的中元古界长城系白云岩、白云质大理岩,扩展了该地区地热勘探前景。This paper is the result of geothermal geology.[Objective]This paper summarizes the upland belt heat reservoir in the Chongli and Chicheng area,which can be used as a reference for geothermal investigation in similar exploration areas and provide a new basis for geothermal resource exploration in the future.[Methods]Based on field geological survey and structural mapping,combined with the results of Controlled source acoustic magnetotelluric(CSAMT),the characteristics of thrust nappe structure and the prospect of geothermal exploration in the Chongli and Chicheng area are analyzed.[Results]Field geological survey and structural mapping revealed the overthrust and nappe structure in the Chongli—Chicheng area as well as buried and folded the Archeozoic and Paleoproterozoic Erathem and Cretaceous in the foot wall.There are typical zonation and stratification of thrust nappe structure.Preliminary results from Controlled source acoustic magnetotelluric(CSAMT)sounding validate the thrust nappe structure and the fault inclines to the north with a dip Angle of more than 60 and converges deep into the main floor thrust fault.[Conclusions]The discovery of the middle Proterozoic dolomite and the geothermal exploration prospect in this area has been expanded.

关 键 词：逆冲推覆构造 CSAMT 构造演化 地热前景 崇礼-赤城地区 

分 类 号：P314[天文地球—固体地球物理学]