基于重磁多尺度边缘检测的庐枞盆地基底构造研究

Study on Basement Structure of the Luzong Basin Based on Gravity and Magnetic Multi-scale Edge Detection

庐枞盆地位于怀宁-庐江"磁高重高"区域异常带的枞阳-庐江异常区,其区域重力场特征与区域磁场特征明显。本文利用上述特征异常,采用重磁多尺度边缘检测方法,对庐枞盆地重力和航磁数据进行了边缘检测,得到庐枞盆地不同深度的密度和磁性信息及重磁异常边界。结合重磁异常分布特点进行构造格架的推断、基底隆起区划分,建立了庐枞盆地构造格架。认为庐枞盆地基底断裂有四组方向,以北东走向断裂为主;盆地包含四块基底隆起区和一块基底残块隆起区。在此基础上,分析了庐枞盆地主要矿集区与构造格架的关系,提出了"S"形重力高异常带是寻找中深部隐伏矿床的有利部位的新认识。

The Luzong basin is located in the Zongyang-Lujiang anomaly area of the Huaining-Lujiang anomaly zone which exhibits regional high gravitational and magnetic anomalies. In this paper ,we obtained density and magnetic information at different depth,and the boundary of gravity and mag- netic anomalies in the Lu-Zoug Basin based on multi-scale edge detection. Integrating with the gravity and magnetic anomaly distribution,we inferred the tectonic framework, divided the basement uplift areas, and constructed the tectonic framework of the Luzong basin. We consider that there are four direc- tions of basement faults in the Luzong basin, and the main direction is north-east. The basin includes four basement uplift areas and one basement remnant uplift area. Considering the relationship between ore concentration areas and tectonic framework of the Luzong basin, it is suggested that the ＂S＂ shape gravity-high anomaly zone is favorable for searching for deep and concealed ore deposits.