Gravity field characteristics and boundaries of geotectonic units on the northeastern margin of the Linyi uplift, Shandong Province
WANG Run-Sheng1,2(), WU Bin3, ZHANG Hai-Rui3, YU Jia-Bin1,2(), DONG Yan-Long4,5, GUO Guo-Qiang1,2, KANG Yi-Ming1,2
1. Shandong Geophysical and Geochemical Exploration Institute, Jinan 250013, China 2. Shandong Geological Exploration Engineering Technology Research Center, Jinan 250013,China 3. No. 4 Exploration Institute of Geology and Mineral Resources of Shandong Province, Weifang 261021,China 4. School of Earth Sciences, China University of Geosciences (Wuhan),Wuhan 430074, China 5. State Key Laboratory of Geological Processes and Mineral Resources, China Univesity of Geosciences(Wuhan),Wuhan 430074, China
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.
王润生, 武斌, 张海瑞, 于嘉宾, 董彦龙, 郭国强, 康一鸣. 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[J]. 物探与化探, 2023, 47(2): 279-289.
WANG Run-Sheng, WU Bin, ZHANG Hai-Rui, YU Jia-Bin, DONG Yan-Long, GUO Guo-Qiang, KANG Yi-Ming. Gravity field characteristics and boundaries of geotectonic units on the northeastern margin of the Linyi uplift, Shandong Province. Geophysical and Geochemical Exploration, 2023, 47(2): 279-289.
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