Composition of sedimentary organic matter in Shenhu, northern South China Sea since the Last Glacial Maximum and its implication for paleoclimate

Lei Yan; Hu Jianfang; Xiang Rong; Fu Shaoying; Li Yongxiang; Cao Huairen

doi:10.3969/j.issn.0253-4193.2017.11.007

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Lei Yan, Hu Jianfang, Xiang Rong, Fu Shaoying, Li Yongxiang, Cao Huairen. Composition of sedimentary organic matter in Shenhu, northern South China Sea since the Last Glacial Maximum and its implication for paleoclimate[J]. Haiyang Xuebao, 2017, 39(11): 75-84. doi: 10.3969/j.issn.0253-4193.2017.11.007

Citation:

Lei Yan, Hu Jianfang, Xiang Rong, Fu Shaoying, Li Yongxiang, Cao Huairen. Composition of sedimentary organic matter in Shenhu, northern South China Sea since the Last Glacial Maximum and its implication for paleoclimate[J]. Haiyang Xuebao, 2017, 39(11): 75-84. doi: 10.3969/j.issn.0253-4193.2017.11.007

Citation:

Lei Yan, Hu Jianfang, Xiang Rong, Fu Shaoying, Li Yongxiang, Cao Huairen. Composition of sedimentary organic matter in Shenhu, northern South China Sea since the Last Glacial Maximum and its implication for paleoclimate[J]. Haiyang Xuebao, 2017, 39(11): 75-84. doi: 10.3969/j.issn.0253-4193.2017.11.007

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Composition of sedimentary organic matter in Shenhu, northern South China Sea since the Last Glacial Maximum and its implication for paleoclimate

doi: 10.3969/j.issn.0253-4193.2017.11.007

1.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
3.
South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
4.
Guangzhou Marine Geological Survey, Guangzhou 510760, China
5.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China

Received Date: 2016-12-23
Rev Recd Date: 2017-03-24

Abstract

Abstract

The total organic carbon (TOC), total nitrogen (TN), C/N ratios and the stable carbon isotope of bulk sediment organic matter (δ¹³C_org) in the GHE27L and GHE24L cores, collected from Shenhu area in the northern South China Sea (NSCS), were analyzed to reveal the composition of sedimentary organic matter (OM) and the paleoclimate changes since the Last Maximum Glacial (LMG). The values of TOC, TN, C/N, and δ¹³C_org ranged from 0.53% to 1.81%, 0.07% to 0.18%, 8.2 to 16.0 and-23.6‰ to 20.3‰ in Core GHE27L, and 0.45% to 1.65%, 0.09% to 0.24%, 5.3 to 12.2 and-22.6‰ to-20.4‰ in Core GHE24L, respectively. The profiles of bulk OM indicated that the OM mixed origins from both terrigenous and marine OM, and that marine OC was the major source of OC in the NSCS since the LGM. The relative contribution of terrigenous OM in the glaciation was higher than that in the Holocene. The climate was dry and C₄ plants were to thrive in the NSCS during the last glaciation. The precipitation enhanced due to the strong summer Asian Monsoon in the NSCS during the Holocene. However, it seems that the primary productivity in the NSCS was impacted by the anthropogenic activities since the last 2.0 ka BP.
- northern South China Sea,
- Last Glacial Maximum,
- stable carbon isotope,
- paleoclimate

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References(39)

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