DOI: 10.1016/j.palaeo.2016.03.012
论文题名: Sedimentary evolution during the last ~1.9 Ma near the western margin of the modern Bohai Sea
作者: Liu J. ; Wang H. ; Wang F. ; Qiu J. ; Saito Y. ; Lu J. ; Zhou L. ; Xu G. ; Du X. ; Chen Q.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 451 起始页码: 84
结束页码: 96
语种: 英语
英文关键词: Bohai Sea
; Holocene
; Marine transgression
; Pleistocene
; Sea-level change
; Sedimentary environment
英文摘要: Because the Bohai Sea is a semi-enclosed sea connected to the North Yellow Sea only via the Bohai Strait, its sedimentary evolution during the Quaternary has been complex. In particular, the timing of Quaternary transgressions, especially Pleistocene transgressions, in the region, has long been a matter of controversy. Thus, the sedimentary history of the Bohai Sea in the Quaternary is still poorly understood. Borehole core YRD-1101 (200.30 m long), drilled in 2011 on the northern coast of the modern Yellow River delta, covers the last ~1.90 Ma, as indicated by paleomagnetic measurements. Here we report the results of integrated analyses of the core, including its sedimentary characteristics, downcore changes in environmental proxies (benthic foraminifers and ostracods), and accelerator mass spectrometry (AMS) 14C and optically stimulated luminescence (OSL) dates. From ~1.9 to ~0.83 Ma, the environment was fluvial. The first Quaternary transgression occurred at ~0.83 Ma (the latest Early Pleistocene), presumably caused by minor subsidence of the Miaodao Islands Uplift. Several relatively weak transgressions occurred from ~0.83 Ma to the end of the Middle Pleistocene, and three major marine sedimentary beds, here called T-3, T-2, and T-1 in ascending order, recorded in the early to middle MIS 5, the early MIS 3, and the middle to late Holocene, respectively, were presumably caused by major subsidence of the Miaodao Islands Uplift. In transgression strength, T-3 was weaker than T-2, which was basically the same as T-1. We interpret the change in transgression strength to reflect the interplay of sea-level changes, neotectonic subsidence, and sediment supply changes. Comparisons with other cores from around the Bohai Sea showed that the thickness of the Quaternary sedimentary sequence differs significantly among them, and both the T-2 and T-3 clearly display differences in thickness, facies sequence, and completeness among the cores, highlighting the important role of tectonic activity in the evolution of the Quaternary stratigraphy in the Bohai Bay Basin. © 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68435
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marine Hydrocarbon Resources and Environmental Geology, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao, China; Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Geological Survey of Japan, AIST, Central 7, Higashi 1-1-1, Tsukuba, Ibaraki, Japan; Department of Natural Environmental Studies, Graduate School of Frontier Sciences, University of Tokyo, Kashiwanoha 5-1-5, Kashiwa, Chiba, Japan
Recommended Citation:
Liu J.,Wang H.,Wang F.,et al. Sedimentary evolution during the last ~1.9 Ma near the western margin of the modern Bohai Sea[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,451