摘要
内蒙宁城地热区位于华北板块北缘,是我国北方重要的矿带和矿田。本次研究对宁城地区成热控热构造系统进行厘定和研究,用成生联系的思想综合分析了不同尺度的控热断裂带之间的联系,包括嫩江-八里罕断裂、黑里河断裂和大庙-锦山断裂,阐述了不同系统的主干构造体系及其复合对地热分布的控制。嫩江-八里罕断裂南段"山"字形构造的NW向断裂,向SE向发生近40°错移,偏转后呈"S"型弧形弯曲,在转折端西侧构造应力集中的深成隐伏侵入岩蚀变带中出现地热异常。同时,SN向的热水镇-大营子断褶带后期继承性改造使断层向SN两翼外扩,为深成岩浆侵入及热能上升提供了通道,可能是地热形成的主要构造因素。由于岩浆侵入活动加剧,造成地热区差异性上升运动,使壳源深部热源上移;地下水在深部循环加热后,在高海拔补给带的静水压力下沿断裂通道上升,形成地热流体。
The Ningcheng geothermal area of Inner Mongolia is located in the northern margin of the North China plate, which is an important ore belt and ore field in northern China. This work has made an analysis of the thermal-controlled tectonic system in the Ningcheng area, focusing on the relationship between the thermal-controlling fault zones of different scales, including the Nenjiang-Baliqian, Heilihe, and Damiao-Jinshan faults. The controlling effects of the main tectonic system and its composition on the geothermal distribution of different systems are elucidated. The NW-trending faults in the south segment of the Nenjiang-Balikan fault are nearly 40 ° away from the SE direction, and are bent as the ＂S＂ arc-like after the deflection. Geothermal anomalies occur at the localities with stress concentration on the west side of the transition point where deeply buried alteration zones are present. At the same time, the successional reconstruction of the NS-trending Reshuizheng-Dayingzi fault-fold belt made the fault extend to the south and north flanks, providing channels for deep magmatic intrusion and thermal energy rise, which may be the main structural factors of geothermal formation. Due to the intensification of magmatic intrusion activity, the increase of geothermal area resulted in the movement of the deep heat source of the crust. The groundwater heated up in the deep cycle and along the fault channel under the hydrostatic pressure of the high-altitude recharge belt, forming geothermal fluid.
出处
《地质与勘探》
CAS
CSCD
北大核心
2018年第1期166-173,共8页
Geology and Exploration
基金
中国地质调查局"华北地区古生代构造岩浆热事件性质及资源效应综合研究"项目(编号:1212011121072)资助
关键词
地热资源
构造制约
对流型地热
勘查标志
宁城
内蒙古
distribution of the underground thermal-water resources, faults, tectonic constraints, convective geothermal resources, prospecting indicater, Ningcheng, Inner Mongolia
