Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay

Yao Jing; Yu Hongjun; Xu Xingyong; Yi Liang; Chen Guangquan; Su Qiao

doi:10.1007/s13131-014-0536-0

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Yao Jing, Yu Hongjun, Xu Xingyong, Yi Liang, Chen Guangquan, Su Qiao. Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay[J]. Acta Oceanologica Sinica, 2014, 33(10): 10-18. doi: 10.1007/s13131-014-0536-0

Citation:

Yao Jing, Yu Hongjun, Xu Xingyong, Yi Liang, Chen Guangquan, Su Qiao. Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay[J]. Acta Oceanologica Sinica, 2014, 33(10): 10-18. doi: 10.1007/s13131-014-0536-0

Citation:

Yao Jing, Yu Hongjun, Xu Xingyong, Yi Liang, Chen Guangquan, Su Qiao. Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay[J]. Acta Oceanologica Sinica, 2014, 33(10): 10-18. doi: 10.1007/s13131-014-0536-0

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Paleoenvironmental changes during the late Quaternary as inferred from foraminifera assemblages in the Laizhou Bay

doi: 10.1007/s13131-014-0536-0

1.
Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Received Date: 2013-06-05
Rev Recd Date: 2013-11-27

Abstract

Abstract

Controlled by climate changes, there were three large-scale transgressions and regressions around the Bohai Sea during the late Quaternary, which were accepted by most geologists. However, a big controversy still exists about the time when the transgressions occurred separately. In order to find out the process of the paleoenvironmental changes around the Bohai Sea in the late Quaternary, the foraminifera assemblages from a new borehole Lz908 in the southern coast of the Laizhou Bay were studied, and then the transgressive strata were indentified. Combined with accelerator mass spectrometry radiocarbon ¹⁴C (AMS¹⁴C) and optically stimulated luminescence (OSL) ages, the occurrence time of these transgressions were re-determined. The result showed that three major large-scale transgressions occurred separately at the beginning of marine isotopic stage 7 (MIS7), the last interglacial period (MIS5) and the Holocene. In addition, a small-scale transgression occurred in the mid-MIS6, and the corresponding transgressive stratum was deposited. The transgressive deposition of MIS3 was also discovered in this study. However, the characteristics of the foraminifera indicated the environment during this period was colder than that in the MIS5. By comparison with the global sea-level changes, the paleoenvironmental changes around the Bohai Sea in the late Quaternary can be consistent with the global climate changes.
- foraminifera assemblage,
- late Quaternary,
- environmental changes,
- Laizhou Bay,
- Bohai Sea

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References(21)

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