Sediment Provenance of the Nansha Trough Since 40 ka BP in the South China Sea: Evidence From delta C-13(org), TOC and Pollen Composition

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 (delta C-13(org)), total nitrogen (TN) and organic carbon...

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Bibliographic Details
Published in:Frontiers in Earth Science
Main Authors: Thilakanayaka, Vidusanka, Luo Chuanxiu, Rong Xiang, Devendra, Dhanushka, Dasanayaka, S. A. H. K., Jiang, Weiming, Rahman, Ananna, Kumar, Sazal, Ariful, G. M.
Format: Report
Language:English
Published: FRONTIERS MEDIA SA 2019
Subjects:
Geology
Southern South China Sea
TOC
delta C-13(org)
pollen
deep ocean
sediment provenance
Geosciences
Multidisciplinary
SAN-FRANCISCO BAY
ORGANIC-MATTER
NORTH-ATLANTIC
STABLE CARBON
ASIAN MONSOON
INDIAN-OCEAN
LOW-LATITUDE
C/N RATIOS
PLEISTOCENE
HOLOCENE
Indian
Sunda
North Atlantic
Online Access:http://ir.gig.ac.cn/handle/344008/50225
https://doi.org/10.3389/feart.2019.00110
Description
Summary: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 (delta C-13(org)), total nitrogen (TN) and organic carbon to total nitrogen ratios (C/N) were obtained from a gravity core NS07-25 (6 degrees 39.945' N, 113 degrees 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.

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