DOI: 10.1016/j.palaeo.2016.10.033
论文题名: Temporal and spatial patterns of sediment deposition in the northern South China Sea over the last 50,000 years
作者: Liu J. ; Steinke S. ; Vogt C. ; Mohtadi M. ; De Pol-Holz R. ; Hebbeln D.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 465 起始页码: 212
结束页码: 224
语种: 英语
英文关键词: Clay minerals
; Holocene
; Last glacial maximum
; Pearl River
; Sea level
; South China Sea
英文摘要: Sediment depositional patterns along the upper continental slope of the northern South China Sea (SCS) have been studied using two sediment cores (GeoB16601-6, 20°09.07′N, 116°14.38′E, 1012 m water depth and GeoB16602-4, 18°57.12′N, 113°42.64′E, 951 m water depth) recovered during RV SONNE Cruise SO-221 “INVERS”. Sediment cores were analyzed for bulk sediment element composition by X-Ray Fluorescence (XRF) core scanning and clay mineral assemblage by X-Ray Diffraction (XRD). The bulk sediment element and the clay mineral compositions of the two cores suggest similar depositional patterns between 50 kyr BP and ~ 29 kyr BP, and ~ 14 kyr BP to present, but a clear difference in depositional patterns during the last glacial and deglacial (~ 29–14 kyr BP) when sea level was below − 90 m. Between ~ 29–14 kyr BP, a higher kaolinite percentage in core GeoB16602-4 in comparison to core GeoB16601-6 is interpreted to reflect a higher contribution of clay supplied by the Pearl River to core site GeoB16602-4. In contrast, core GeoB16601-6 received less Pearl River supplied clayey material during the same period. When the sea level was below − 90 m during the last glacial lowstand, the detrital fine-grained materials supplied by the Pearl River were mostly transported by coastal currents to the southwest, resulting in a higher contribution of Pearl River discharged material at site GeoB16602-4 than at site GeoB16601-6. We suggest that sea-level induced modifications of the land-ocean distribution together with changes in the palaeo-physiographic conditions, such as the proximity of the palaeo-rivers to the individual core sites might be responsible for the different sediment depositional patterns in the study area. Thus, the overriding control of sea-level induced changes on the sediment depositional environment might mask climate-related changes in sediment depositional pattern in the northern SCS. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68127
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China; MARUM, Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany; ZEKAM, Department of Geosciences, University of Bremen, Bremen, Germany; GAIA-Antártica, University of Magallanes, Punta Arenas, Chile
Recommended Citation:
Liu J.,Steinke S.,Vogt C.,et al. Temporal and spatial patterns of sediment deposition in the northern South China Sea over the last 50,000 years[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,465