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Paleo-megalake termination in the Quaternary: Paleomagnetic and water-level evidence from south Bohai Sea, China
Yi, Liang1,3; Deng, Chenglong1; Xu, Xingyong2; Yu, Hongjun2; Qiang, Xiaoke4; Jiang, Xingyu5; Chen, Yanping6; Su, Qiao2; Chen, Guangquan2; Li, Ping2; Ge, Junyi7; Li, Yan8

Asian marginal seas play an important role in moderating material and energy flux linkages between Asia and the Northwest Pacific, and thus have profound climatic and environmental effects. In this study, by combining paleomagnetic study with sediment grain-size analysis on the Lz908 borehole sedimentary sequence from the southern Bohai Sea, new insights into regional geomorphological process since the late early Pleistocene are obtained. The main results are as follows. (1) Paleomagnetic findings suggest that the sequence recorded the Brunhes normal chron and the late Matuyama reverse chron, including the Jaramillo normal subchron. (2) The sedimentary processes in the study area since 1327 ka show a three-stage pattern, with depositional rates of 4.3, 17 and 107 cm/ka during 1327-260 lea (later part of the early and middle Pleistocene), 260-10 lea (late middle and late Pleistocene), and the Holocene, respectively. (3) The sedimentary basin was a part of the Bohai Paleolakes (BHPL) prior to 260 ka, whose water levels were consistently higher than 3 m above the present-day level. After 260 ka, seawater entered the Bohai basin, and relative sea level cyclically fluctuated with global sea-level changes. We therefore infer that the Miaodao Islands, which were the natural barrier of the BHPL blocking seawater entry, had partially subsided before 260 ka, only allowing seawater to enter the basin during a global sea-level maximum. The BHPL terminated around 260 ka, and the "barrier" subsided completely around similar to 130 ka, causing the Bohai basin to become an inner shelf sea. (C) 2015 Elsevier B.V. All rights reserved.

KeywordBohai Paleolakes Magnetostratigraphy Water Level Reconstruction Quaternary
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordIsothermal Remanent Magnetization ; Lu Fault Zone ; Polymodal Sediments ; Acquisition Curves ; Western Pacific ; Thermal History ; Eastern China ; Marginal Seas ; Pleistocene ; Constraints
Indexed BySCI
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000351795400001
Citation statistics
Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorYi, Liang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China
3.Chinese Acad Sci, Sanya Inst Deep Sea Sci & Engn, MSG Grp, Sanya 572000, Peoples R China
4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
5.China Geol Survey, Tianjin Ctr, Tianjin 300170, Peoples R China
6.State Ocean Adm, Inst Oceanog 2, Key Lab Engn Oceanog, Hangzhou 310012, Zhejiang, Peoples R China
7.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China
8.China Univ Geosci, Sch Ocean Sci, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Yi, Liang,Deng, Chenglong,Xu, Xingyong,et al. Paleo-megalake termination in the Quaternary: Paleomagnetic and water-level evidence from south Bohai Sea, China[J]. SEDIMENTARY GEOLOGY,2015,319:1-12.
APA Yi, Liang.,Deng, Chenglong.,Xu, Xingyong.,Yu, Hongjun.,Qiang, Xiaoke.,...&Li, Yan.(2015).Paleo-megalake termination in the Quaternary: Paleomagnetic and water-level evidence from south Bohai Sea, China.SEDIMENTARY GEOLOGY,319,1-12.
MLA Yi, Liang,et al."Paleo-megalake termination in the Quaternary: Paleomagnetic and water-level evidence from south Bohai Sea, China".SEDIMENTARY GEOLOGY 319(2015):1-12.
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