郯庐断裂带南段的重磁场特征及其地质意义

doi:10.13745/j.esf.sf.2022.1.55

摘要/Abstract

摘要：

由于断裂两侧的磁性、密度的纵横向差异在重力、磁力异常上有所表现,因此所获得的重力、磁力数据为深入研究关键的地质课题提供了科学基础,如郯庐断裂带的基底性质、断裂形成特征和岩浆岩分布。利用最新的高精度航空重力和磁力数据以及地面重力数据,绘制了郯庐断裂带地区的1∶50 000重力和磁力异常图,并结合区域地质数据分析了重力和磁力异常特征。分析结果认为:存在连体的郯庐—大别古老构造带,郯庐断裂带南段是元古宙和燕山中期岩浆活动的复合反映带;郯庐断裂带为中元古—新元古代时期南华北陆块与下扬子陆块的界限;磁力、重力异常图对比说明,合肥盆地范围由老到新向东扩展。

关键词: 郯庐—大别古老构造带, 合肥盆地, 航空重磁, 基底性质, 岩浆活动, 华北东南边界

Abstract:

The differences between transverse and longitudinal magnetism or density on both sides of a fault are reflected in gravity and magnetic anomalies. Therefore, the gravity and magnetic anomaly data provide a scientific basis for in-depth studies of key geological research topics, such as the base properties, fault formation characteristics and magma distribution in the Tanlu fault zone. The 1∶50000 scale gravity and magnetic anomaly maps of the Tanlu fault zone were drawn using the up-to-date high-precision airborne gravity data, aeromagnetic data and ground gravity data. Combined with the regional geological data, the characteristics of gravity and magnetic anomalies were also analyzed. The results indicated the existence of an ancient conjoined Tanlu-Dabie structural belt, where the southern segment of the Tanlu fault zone reflects the magmatic activities in the Proterozoic-Middle Yanshan period, while the entire fault zone defines the boundary between the southern North China block and the Yangtze block in the Mesoproterozoic-Neoproterozoic era. A comparison of the magnetic and gravity anomaly maps showed an eastward expansion of the Hefei Basin over geological time.

Key words: Tanlu-Dabie structural belt, Hefei Basin, airborne gravity and magnetism, basement property, magmation, North China Southeast border

中图分类号:

郑祺方, 郑宇舟, 赵睿, 匡星涛, 张婉, 刘英会, 徐璐平, 吴云, 周道卿. 郯庐断裂带南段的重磁场特征及其地质意义[J]. 地学前缘, 2022, 29(3): 292-303.

ZHENG Qifang, ZHENG Yuzhou, ZHAO Rui, KUANG Xingtao, ZHANG Wan, LIU Yinghui, XU Luping, WU Yun, ZHOU Daoqing. Gravity and magnetic anomaly in the southern Tanlu fault zone and its geological interpretation[J]. Earth Science Frontiers, 2022, 29(3): 292-303.

图/表 5

图1 郯庐断裂构造简图与测区地质图(图1a据文献[9]补充修改;图1b引自安徽省地质调查与环境监测中心)

Fig.1 (a) Simplified structural map of the central and southern parts of the Tanlu fault zone (modified from [9]) and (b) geological map of the study area (adapted from Anhui Geological Survey and Environmental Monitoring Center)

图2 合肥盆地及其周缘航空磁力异常特征图 a—航磁ΔT化极图;b—航空磁化极垂向一次导数图;c—斜导数图;d—Theta图;e—化极上延4 km图。

Fig.2 Airborne magnetic anomaly maps of the Hefei Basin and surrounding areas

图3 合肥盆地及其周缘航空重力异常特征图 a—航空布格重力图;b—航空布格重力垂向一次导数图;c—航空布格重力上延4 km图;d—斜导数图;e—Theta图。

Fig.3 Airborne gravity anomaly maps of the Hefei Basin and surrounding areas

图4 郯庐断裂带合肥段大范围重磁异常图 a—航磁ΔT化极图;b—地面布格重力异常图。

Fig.4 Large scale magnetic and gravity anomaly maps of the Hefei segment of the Tanlu fault zone

图5 郯庐断裂地面布格重力异常反演剖面(AA'测线)

Fig.5 Inversion of Ground Bouguer-corrected gravity anomaly along profile AA' of the Tanlu fault zone

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