Quaternary Magnetostratigraphy Record in Sediments from Borehole BHS01 in the Bohai Strait

doi:10.19657/j.geoscience.1000-8527.2019.02.07

Abstract

Abstract:

Magenetostratigraphy is an effective method to establish reliable geochronological framework, which is critical for reconstructing long-term history of climatic and environmental changes in the past. A detailed palaeomagenetism study on sediments from borehole BHS01 (121.3 m) which is located in the Bohai Strait has been carried out. The results show that the core from the borehole consists of three normal magnetozones which can be correlated to Brunhes, Jaramillo, Olduvai. The basal age of the core is estimated at about 2.25 Ma by the extrapolation of the sedimentation rate in the Matuyama Chron. The Brunhes/Matuyama boundary was found at the core depth of 46.4 m. Thus, through the comprehensive analysis of lithologic, magnetic and sedimentary rate characteristics, we divide the evolutional process of BHS01 into three sedimentary phases: phaseⅠ(2.25 to 1.46 Ma) mainly develops in a fluvial sedimentation; phaseⅡ(1.46 to 0.78 Ma) is accompanied with a stable lacustrine sedimentation; and phaseⅢ(0.78 to 0 Ma) develops in a marine and terrestrial sedimentation. Our results provide a reliable chronological framework for the borehole, facilitating the stratigraphic division and evolutional process of the Quaternary in the Bohai Strait and its neighboring regions.

Key words: Bohai Strait, borehole BHS01, magenetostratigraphy, Quaternary

CLC Number:

SUN Jun, YANG Huiliang, HE Lei, CHU Hongxian, LU Yue, LI Panfeng, LIU Changchun, QI Jianghao, QIANG Xiaoke. Quaternary Magnetostratigraphy Record in Sediments from Borehole BHS01 in the Bohai Strait[J]. Geoscience, 2019, 33(02): 315-324.

Figures/Tables 4

Fig.1 Schematic map of geotectonic units of the study area and the location of borehole BHS01(modified after reference[57])

Fig.2 Orthogonal vector plots of representative samples from borehole BHS01 (solid and open circles denoting horizontal and vertical components respectively)

Fig.3 Lithology and magneto-stratigraphy of borehole BHS01

Fig.4 Comparison of the magneto-stratigraphy of borehole BHS01 with other boreholes from the Bohai Sea and adjacent areas

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