Sediment provenance of the Nansha trough since 40 ka B.P. in the south China sea: evidence from δ13Corg, TOC and pollen composition

Thilakanayaka, Vidusanka, Chuanxiu, Luo, Xiang, Rong, Devendra, Dhanushka, Dasanayaka, S. A. H. K., Jiang, Weiming, Rahman, Ananna, Kumar, Sazal and Ariful, G. M. (2019) Sediment provenance of the Nansha trough since 40 ka B.P. in the south China sea: evidence from δ13Corg, TOC and pollen composition. Frontiers in Earth Science, 7. ISSN 2296-6463

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Abstract

Geochemical proxies in organic matter (OM) are considered to be reliable proxies for deciphering types of paleo-vegetation (C3 plants and C4 plants) and their abundance. The contributions of total organic carbon (TOC), stable carbon isotopes (δ13Corg), total nitrogen (TN) and organic carbon to total nitrogen ratios (C/N) were obtained from a gravity core NS07-25 (6°39.945′ N, 113°32.936′ E, water depth 2006 m), extracted from the southern South China Sea (SCS). These data were used to reconstruct the climate changes of the Nansha Trough since 40 ka B.P. by comparing them with pollen data from the same core, and this comparison provides better sediment provenance details in the study area. During the periods between 37 and 27 ka, and from 12.5 ka to modern day, the majority of terrestrial sediment received from Borneo, and some climatic events have been governed by aeolian fluxes from mid-latitude areas (mainland China). These periods were relatively humid, compared to 27–12.5 ka, where the majority of terrestrial sediment came from the Sunda Shelf through riverine pathways. This study serves as the first study to correlate deep oceanic pollen and geochemical proxies in order to identify the weaken terrestrial OM signals in the deep ocean.

Item Type: Article
Additional Information: Funding Information: We would like to express our gratitude to Prof. Markus Kienast, National Oceanic and Atmospheric Administration and Global Multi-Resolution Topography Data Synthesis for making data available. This work was funded by the National Natural Science Foundation of China (grants 41676047), a research program of Guangzhou Science Technology and Innovation Commission Publisher Copyright: © 2019 Thilakanayaka, Chuanxiu, Xiang, Devendra, Dasanayaka, Jiang, Rahman, Kumar and Ariful.
Uncontrolled Keywords: deep ocean,pollen,sediment provenance,southern south china sea,toc,δc,earth and planetary sciences(all),sdg 13 - climate action ,/dk/atira/pure/subjectarea/asjc/1900
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 01 Feb 2023 15:30
Last Modified: 19 Jul 2024 01:28
URI: https://ueaeprints.uea.ac.uk/id/eprint/90926
DOI: 10.3389/feart.2019.00110

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