Sea level induced variations in clay mineral composition in the southwestern South China Sea over the past 17,000 yr.

Steinke, S., Hanebuth, T. J. J., Vogt, C. and Stattegger, Karl (2008) Sea level induced variations in clay mineral composition in the southwestern South China Sea over the past 17,000 yr. Marine Geology, 250 (3-4). pp. 199-210. DOI 10.1016/j.margeo.2008.01.005.

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Abstract

Variations in clay mineral composition of sediment cores from the margin and continental slope of the Sunda Shelf (southern South China Sea, SE Asia) covering the past 17,000 yr reflect changing influences of sediment sources together with clay mineral partitioning processes in shallow waters. We identify the deglacial sea level rise as the principal factor driving these changes. During the late glacial, high values of kaolinite are interpreted to reflect a higher contribution of clays from soils that have formed on the exposed Sunda Shelf and in the southern archipelagos of Indonesia. At this time core sites were located in close proximity to the mouths of the Sunda Shelf palaeo-drainage systems on the emerged shelf (“Sundaland”). The progressive landward displacement of the coastline and breakdown of these vast drainage systems during deglaciation led to a decrease in influence of the kaolinite-rich southern sources. When the coastline had retreated closely to its present-day position in mid-Holocene times, the former dominance of southern sources was replaced by a stronger influence of illite-rich sources (e.g. Borneo). The overriding control of sea level changes on the clay mineral distribution patterns precludes a definite climatic interpretation of clay mineral data in terms of climatic/monsoonal changes in such highly dynamic sedimentary environment.

Document Type: Article
Keywords: clay minerals, sea level changes, last deglaciationSunda Shelf, South China Sea
Research affiliation: Kiel University
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.margeo.2008.01.005
ISSN: 0025-3227
Projects: Future Ocean
Date Deposited: 12 Oct 2010 11:29
Last Modified: 24 Sep 2019 00:18
URI: http://oceanrep.geomar.de/id/eprint/9140

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