山东省临沂凸起东北缘重力场特征及大地构造单元边界讨论

doi:10.11720/wtyht.2023.1144

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Abstract

The northeastern margin of the Linyi uplift is located at the eastern end of the Luxi Block and immediately adjacent to the Yishu fault in the east. The main structural framework of the study area is controlled by the NE-trending Tangwu-Gegou fault and the NW-trending Mengshan fault. Covered by the Cenozoic sediments, the boundaries of main tectonic units in the study area are almost all concealed, and it is necessary to further investigate the change in the strike of the eastern end of the Mengshan fault as well as the distribution of the angular unconformity along the northern boundary of the Linyi uplift. Using the latest 1:50,000 high-precision gravity data, this study mainly investigated the positions and intersection relationships of the boundaries of tectonic units based on the qualitative analysis of gravity field, the interpretation of multiple gravity potential field conversion, and the division scheme of geotectonic units in Shandong Province. The analysis results are as follows. The Mengshan fault at the junction of the Mengshan uplift and the Pingyi sag transitions from the NW trending to nearly-EW trending in the east of Bancheng Town, significantly cuts the NE-trending Tangwu-Gegou fault, and shows a NW-trending turn to the east again. The angular unconformity at the junction of the Linyi uplift and the Pingyi sag neither ends in the Mengshan fault in the north nor turns southward but extends to the Tangwu-Gegou fault in the east. This unconformity also controls the southern boundary of the Pingyi sag, making the NW-trending banded gravity anomalies of the sag turn eastward. Consequently, the boot-shaped low-value gravity anomalies were formed in the study area. Based on the high-precision gravity boundary identification, this study determined the fault system and tectonic division of the northeastern margin of the Linyi uplift, providing high-precision gravity data for the basic geological study in the study area and laying a good foundation for further mineral geological survey.

Key words： Linyi uplift gravity anomaly potential field conversion geotectonic unit boundary identification

Received: 29 March 2022 Published: 27 April 2023

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	Articles by authors
	Run-Sheng WANG
	Bin WU
	Hai-Rui ZHANG
	Jia-Bin YU
	Yan-Long DONG
	Guo-Qiang GUO
	Yi-Ming KANG

Cite this article:

Run-Sheng WANG,Bin WU,Hai-Rui ZHANG, et al. Gravity field characteristics and boundaries of geotectonic units on the northeastern margin of the Linyi uplift, Shandong Province[J]. Geophysical and Geochemical Exploration, 2023, 47(2): 279-289.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1144 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I2/279

Sketch map of regional geological structure

Density characteristics of the study area

Regional bouguer gravity anomaly map

Map of bouguer gravity anomaly in the study area

Map of residual gravity anomaly in the study area

Gravity analysis map of fault system division in the study area
a—residual gravity anomaly;b—the horizontal gradient module of Bouguer gravity anomaly;c—the first-order vertical derivatives of Bouguer gravity anomaly

Geotectonic background map of the study area

Division of geotectonic units in the study area

Comprehensive schematic diagram of tectonic units division inferred by gravity data
a—bouguer gravity anomaly;b—residual gravity anomaly;c—inferred tectonic units division

Bedrock geological map of pre Neogene inferred by gravity data

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