DOI: 10.1016/j.palaeo.2015.04.017
论文题名: Sr-Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary
作者: Li T. ; Xu Z. ; Lim D. ; Chang F. ; Wan S. ; Jung H. ; Choi J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 430 起始页码: 74
结束页码: 84
语种: 英语
英文关键词: East Asian monsoon
; Northern Okinawa Trough
; Sea level
; Sediment provenance
; Sr-Nd isotope
; Tsushima Warm Current
英文摘要: For this study, elemental and Sr-Nd isotopic compositions of AMS 14C age-dated core sediments from the northern Okinawa Trough were investigated to reconstruct sediment provenance and transport processes over the last 22.3ka and further to trace the forcing mechanisms behind the provenance changes. The results clearly showed that large compositional variations of these elements and isotopes occur in deposition, suggesting three-phases of changes in sediment source: paleo-Huanghe (Unit 3, 22.3-14.8ka), East China Sea shelf-derived (Unit 2, 14.8-7.3ka), and Taiwan-derived detritus stages (Unit 1, <7.3ka). Such provenance changes since the last glacial maximum may be closely correlated to sea-level fluctuation, the evolution of Tsushima Warm Current, as well as East Asian monsoonal climatic variation. At 22.3-14.8ka, the paleo-Huanghe mouth was situated close to the study area, thus dominating sedimentation therein, especially during stronger winter monsoon periods. At the beginning of Unit 2 (14.8-12.8ka), rapid sea-level rise and significant retreat of the river mouth overwhelmed enhanced continental weathering, leading to less detrital sediment supply from the paleo-Huanghe to the study area. Subsequently, the East China Sea shelf-derived matter dominated detrital deposition therein from 12.8 to 7.3ka. Since 7.3ka, the fully evolved Tsushima Warm Current has transported some detrital particles from Taiwan to the study area, especially during the strengthening period at 7.3-5.1ka. A prominent decline in Taiwan-sourced matter supply at 5.1-2.8ka may have been caused by suppression of the Tsushima Warm Current, possibly associated with the Pulleniatina minimum event. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68920
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; South Sea Research Institute, Korea Institute of Ocean Science and Technology, Geoje, South Korea; Marine Environment and Conservation Research Division, Korea Institute of Ocean Science and Technology, KOR; Department of Oceanography, Kunsan National University, Kunsan, South Korea
Recommended Citation:
Li T.,Xu Z.,Lim D.,et al. Sr-Nd isotopic constraints on detrital sediment provenance and paleoenvironmental change in the northern Okinawa Trough during the late Quaternary[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,430