Gravity and magnetic anomaly in the southern Tanlu fault zone and its geological interpretation

doi:10.13745/j.esf.sf.2022.1.55

Abstract

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

CLC Number:

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.

Figures/Tables 5

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)

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

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

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

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

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