沂沭断裂带莱州湾海域重力场特征

doi:10.13278/j.cnki.jjuese.20180283

Abstract

Abstract: Yishu fracture zone is the Shandong section of Tanlu fracture zone. The fracture is not only large in scale, but also strongly active, which has the tectonic framework of "two grabens with one base". Based on the 1:200 000 seabed high-precision gravity survey data, the characteristics of gravity field in Laizhou Bay of Yishu fault zone were studied. The data were processed and interpreted by Euler deconvolution and texture analysis for equal boundary recognition in order to refine the tectonic framework of the study area. According to the characteristics of gravity field, 22 faults are inferred, and the main faults are NE-NNE and near EW faults. The four main faults of Yishu fault zone are distributed in Laizhou Bay, in NNE-trending, paralleling, soothing and undulated. The tectonic units are initially divided into three third level, five forth level,and twelve fifth level of tectonic units. It is inferred that on the west side of the Changyi-Dadian fault the high gravity reflects the basal uplift, and the low gravity mainly reflects the Mesozoic-Cenozoic depression; while on the east side of the fault the high gravity mainly reflects the distribution of the Early Precambrian metamorphic rocks, and the low gravity mainly reflects the distribution of the Mesozoic sequence rocks.

Key words: Yishu fault, Laizhou Bay, sea-floor gravity, tectonic pattern, tectonic unit division

CLC Number:

P631.1

Liu Hongbo, Wu Zhiguo, Zheng Xiaocheng, Wang Enqiang, Wang Yumin, Zhang Ning. Gravity Field Characteristics of Yishu Fault Zone in Laizhou Bay[J].Journal of Jilin University(Earth Science Edition), 2019, 49(5): 1438-1447.

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Gravity Field Characteristics of Yishu Fault Zone in Laizhou Bay

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