Magnetostratigraphy of Borehole ZK1 in Lingdingyang Bay, Pearl River Estuary

doi:10.19657/j.geoscience.1000-8527.2021.165

Abstract

Abstract:

The establishment of the chronological framework in Lingdingyang Bay (Pearl River Estuary) is of great significance to regional paleoenvironment reconstruction and the study of sea-land interaction. Using magnetic stratigraphy and AMS ¹⁴C dating, the geochronology of 0-32 m cores in borehole ZK1 (113°40'E, 22°34'N, 100.3 m depth) in Lingdingyang Bay was analyzed systematically. The AMS ¹⁴C ages of the five samples range from (486±120) to (2,268±149) a BP. Rock magnetic analysis of the cores show that the magnetic minerals are mainly single-and multi-domain magnetite. Magnetic stratigraphy demonstrates core inversion in the coring process, and the magnetic sequence of the inverted core depth section is corrected. By comparing the core geomagnetic inclination and intensity with the standard curves and auroral records in East Asia, a high-re-solution stratigraphic age framework of borehole ZK1 (0-32 m) is established, with a bottom boundary age of 3.5 ka BP. Under this chronology framework, the core magnetic parameters have periodic changes of 3-8 a, 11 a and 21-25 a, which may have been related to the El Nino-Southern Oscillation, Pacific decadal oscillation, global surface temperature anomaly cycles, and solar activity.

Key words: Pearl River Estuary, Lingdingyang Bay, magnetostratigraphy, magnetite

CLC Number:

CAO Kaijun, REN Jinke, LI Xiaomeng, WU Huaichun, CHEN Fang, YU Shaohua, SHI Meinan, GAN Huayang. Magnetostratigraphy of Borehole ZK1 in Lingdingyang Bay, Pearl River Estuary[J]. Geoscience, 2022, 36(01): 58-67.

Figures/Tables 8

Fig.1 Location map of borehole ZK1

Fig.2 Rock magnetic properties of representative samples

Fig.3 Comparison of hysteresis parameters between samples from borehole ZK1 and the Pearl River [22]

Fig.4 Geomagnetic polarity sequence and demagnetization results of borehole ZK1

Table 1 Results of AMS 14C for samples from borehole ZK1

样品编号	取样深度/cm	测年物质	测年结果 /a BP	矫正后年代 /a BP
ZK1-1	42.5~45.0	双壳1瓣	980±30	486±120
ZK1-2	225~230	双壳2瓣	1 070±30	579±126
ZK1-4	1 445~1 446	双壳+腹足	1 750±30	1 212±139
ZK1-5	1 755~1 760	双壳1瓣	1 290±30	748±131
ZK1-8	2 350~2 355	双壳3瓣	2 680±30	2 268±149
ZK1-10	3 220	牡蛎	8 490±30	8 960±184

Fig.5 Core polarity reversal and correction

Fig.6 Geomagnetic field inclination (a), intensity (b), and aurora recorded (e) in East Asia, compared magnetic inclination (c) and intensity (d) of borehole ZK1

Fig.7 Magnetic susceptibility spectral analysis on borehole ZK1

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