DOI: 10.1016/j.palaeo.2013.11.012
论文题名: Paleomagnetic and astronomical dating of sediment core BH08 from the Bohai Sea, China: Implications for glacial-interglacial sedimentation
作者: Yao Z. ; Shi X. ; Liu Q. ; Liu Y. ; Larrasoaña J.C. ; Liu J. ; Ge S. ; Wang K. ; Qiao S. ; Li X. ; Shi F. ; Fang X. ; Yu Y. ; Yang G. ; Duan Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 393 起始页码: 90
结束页码: 101
语种: 英语
英文关键词: Astronomical tuning
; Bohai Sea
; Glacial-interglacial
; Magnetostratigraphy
; Sea level
英文摘要: Sediments from the continental shelf/coastal region bear significant signals of sea-level, climate change as well as local tectonic information. This study presents a high-resolution magnetostratigraphic and rock magnetic study of a 212.4m core (BH08, with a basal age of 1.06Ma) recovered from the shallow (<30m below sea level) Bohai Sea, China. Astronomical tuning based on the sediment redness (a*) of core BH08 allows the construction of a high-resolution chronology that is assisted by magnetostratigraphic data. Sedimentology and associated proxies (grain size and redness) indicate that the cyclic alternation of neritic/littoral sandy deposits and terrestrial silts/clayey silts was mainly controlled by changes in sea-level and associated base-level at glacial-interglacial timescales. The a* record of the core can be correlated with marine δ18O records at 40- and 100-kyr cycles, indicating that the sediments in the study area are continuous at least at orbital timescales regardless of significant base-level variations. This is likely due to continued subsidence in the basin and creation of accommodation space. The significant lower sedimentary accumulation rates since 750ka might be due to the deviation of the depositional locus from core site because of extreme low sea-level stands during the glacials since the Mid-Pleistocene transition (MPT). Especially the glacial sea-level lowstands might have resulted in bypassing or erosion of sediments on the BH08 core site during peak glacials (MIS 6, MIS 10 and MIS 16), limiting the sediment preservation potential. This study documents the longest Quaternary sedimentary succession in the Bohai Sea and provides, for the first time, a clear link between sedimentation in the area and glacial-interglacial climate-driven sea-level changes. This study also highlights the feasibility of astronomical tuning to obtain high-resolution chronology for shallow shelf deposits, which is otherwise very difficult to be achieved on the basis of magnetostratigraphic data alone. © 2013. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69508
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China; Paleomagnetism and Geochronology Laboratory (SKL-LE), Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Unidad de Zaragoza Instituto Geológico y Minero de España, C/ Manuel Lasala, 44, 9B, Zaragoza 50006, Spain; Institute of Earth Sciences Jaume Almera, ICTJA-CSIC, Solé i Sabarís s/n, Barcelona 08028, Spain; University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation:
Yao Z.,Shi X.,Liu Q.,et al. Paleomagnetic and astronomical dating of sediment core BH08 from the Bohai Sea, China: Implications for glacial-interglacial sedimentation[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,393