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| 基金项目：安徽省自然资源科技项目“安庆—池州—铜陵地区深部成矿背景及深部找矿预测研究”（2020-k-13），安徽省公益性地质项目“1∶5万洪镇（H50E009012）、安庆市（H50E009013）幅深部矿产地质调查”（2023-g-3）、“安徽省霍山及怀宁地区中生带火山岩盆地铁、铜、金多金属矿调查评价”（2014-g-8） |
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| 摘要： |
| 为加强安徽怀宁盆地深部构造与成矿关系的研究，采用重、磁、音频大地电磁测深（AMT）综合地球物理方法，布设3条总长50 km的联合剖面，通过重磁延拓、AMT二维带地形连续介质反演及数据融合分析，结合岩石物性参数，系统分析怀宁盆地基底构造与深部岩体分布。结果表明：该盆地基底整体西北低、东南高，深部存在约1 km厚的闪长岩侵入体，其接触带附近发育低阻异常带，为成矿有利部位；区内重磁异常与AMT高阻层对应关系明显，揭示盆地基底由三叠—泥盆纪碳酸盐岩与侏罗—白垩纪火山岩组成，构造活动以伸展断裂和基底差异隆升为主。研究成果可为该盆地开展后续深部地质构造研究提供地球物理依据。 |
| 关键词：AMT 深部构造 地球物理 怀宁盆地 安徽 |
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| Abstract: |
| To strengthen the study of the deep structure and its metallogenic relationship in the Huaining Basin of Anhui Province, this study employs a comprehensive geophysical approach integrating gravity, magnetic, and audio-frequency magnetotelluric (AMT) methods. Three joint profiles with a total length of 50 km were deployed. Through upward/downward continuation of gravity and magnetic data, 2D inversion with topography for a continuous medium of AMT data, and data fusion analysis integrated with petrophysical parameters, the basement structure and deep rock body distribution in the Huaining Basin are systematically investigated. The results indicate that the basin basement generally dips from high in the southeast to low in the northwest. An approximately 1-km-thick diorite intrusion exists at depth, accompanied by a low-resistivity anomaly zone near its contact area, which represents a favorable location for mineralization. The significant correlation between gravity-magnetic anomalies and the high-resistivity layer identified by AMT further reveals that the basin basement consists of Devonian to Triassic carbonate rocks and Jurassic-Cretaceous volcanic rocks. Tectonic activities in the region are primarily characterized by extensional faults and differential basement uplift. These findings provide a geophysical basis for subsequent deep geological structure research in the Huaining Basin. |
| Keywords:AMT deep structure geophysics Huaining Basin Anhui |
| 王 宁,李孜腾.基于重磁电综合方法的安徽怀宁盆地基底构造研究[J].地质学刊,2026,50(2):173-181 |
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