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Archive · collection · 2016

Radiocarbon ages, clay mineral assemblage data, X-ray fluorescence (XRF) core scanning data of sediment cores GeoB16601-6 and GeoB16602-4

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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'.

Description

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.

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In contrast, core GeoB16601-6 received less Pearl River supplied clayeymaterial during the same period.When the sea levelwas below-90mduring 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.

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Provenance · 1 source records, 7 field assertions
SourceKeyLast seenRaw
PANGAEAoai:pangaea.de:doi:10.1594/PANGAEA.86835913 d agoJSON v1
FieldAssertionExtractorEvidence
access_levelsource · PANGAEAconnector:pangaea@1.0.0
concepts[field].local:field:earth-environmentalmapping · PANGAEAconnector:pangaea@1.0.0
descriptionsource · PANGAEAconnector:pangaea@1.0.0/metadata/dc/description
licensesource · PANGAEAconnector:pangaea@1.0.0/metadata/dc/rights
publication_datesource · PANGAEAconnector:pangaea@1.0.0
spatialsource · PANGAEAconnector:pangaea@1.0.0
titlesource · PANGAEAconnector:pangaea@1.0.0/metadata/dc/title