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Geoscience ›› 2018, Vol. 32 ›› Issue (02): 270-278.DOI: 10.19657/j.geoscience.1000-8527.2018.02.06

• Tectonics • Previous Articles     Next Articles

Study on the Cyclic Stratigraphy Activity of Nankou-Sunhe Fault in Beijing Plain Since Quaternary and Its Tectonic Significance

BAI Lingyan1(), LI Xiao2(), QIN Haomin3, ZHANG Xiaoliang1, ZHANG Yueze1   

  1. 1. Beijing Institute of Geological Survey,Beijing 100195, China
    2. Information Center of Beijing Geology Prospecting and Developing Bureau, Beijing 100195, China
    3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
  • Received:2017-10-10 Revised:2018-01-24 Online:2018-04-10 Published:2018-05-07

Abstract:

As one of buried faults, Nankou-Sunhe Fault is the only one northwest striking active fault in Beijing plain. In order to study its activity, this study analyzed characteristics of magnetic susceptibility and natural gamma ray for drillholes of ZK17 and ZK18, and the spectrum analysis was conducted on the magnetic susceptibility and natural gamma ray data of the two drillholes.ZK17 is located at the hanging wall and ZK18 is at the lower wall. Significant Milankovitch sedimentary cycles were respectively identified in the two drillholes, revealing that the Quaternary paleoclimate and deposition process in Beijing plain were controlled by orbital forcing. A continuous astronomical time scale was established by tuning the bandpass filtered-100ka-short eccentricity signal from initial age constrained time series to the astronomical solutions, thus it got a fine way to study the fault’s activity. Six phases which are relatively active have been identified by the comparative study on deposition rate of the two walls, and four of them are in Early Pleistocene and the active period is 0.4 Ma. The first and third phases are correspond to the B (2.6 Ma) and C(1.7 Ma) periods of Qingzang Movement; the activity characteristics in the Middle Pleistocene are related to Kunhuang Movement; so the characteristics of neotectonic movement in Beijing plain have a good relationship to Qingzang and Kunhuang movements.

Key words: cyclic stratigraphy, Nankou-Sunhe fault, activity characteristic, Quaternary, Qingzang movement, Kunhuang movement

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