Journal of Jilin University(Earth Science Edition) ›› 2019, Vol. 49 ›› Issue (5): 1438-1447.doi: 10.13278/j.cnki.jjuese.20180283

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Gravity Field Characteristics of Yishu Fault Zone in Laizhou Bay

Liu Hongbo1,2, Wu Zhiguo1,2, Zheng Xiaocheng3, Wang Enqiang1,2, Wang Yumin1,2, Zhang Ning1,2   

  1. 1. Shandong Physical and Chemical Exploration Institute, Jinan 250013, China;
    2. Shandong Provincial Engineering Research Center for Geological Prospecting, Jinan 250013, China;
    3. College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China
  • Received:2018-11-05 Published:2019-10-10
  • Supported by:
    Supported by Shandong Province Independent Innovation Achievement Conversion Project(New Industries)(2015ZDXX0501A01) and Shandong Province Geological Prospecting Projects(LuKanZi[2015]15)

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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
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