loading page

Contrasting sensitivity of weathering proxies to Quaternary climate and sea-level fluctuations in the southern South China Sea
  • +10
  • Yi Zhong,
  • David Wilson,
  • Jiabo Liu,
  • Shiming Wan,
  • Rui Bao,
  • Jianxing Liu,
  • Yanan Zhang,
  • Xuesong Wang,
  • Yuanhao Liu,
  • Xiaoyu Liu,
  • Ying Zhao,
  • Shiying Li,
  • Qingsong Liu
Yi Zhong
Department of Marine Science and Engineering, Southern University of Science and Technology,

Corresponding Author:zhongy@sustech.edu.cn

Author Profile
David Wilson
University College London
Author Profile
Jiabo Liu
Center for Marine Magnetism, Department of Ocean Science and Engineering, Southern University of Science and Technology
Author Profile
Shiming Wan
Institute of Oceanology, Chinese Academy of Sciences
Author Profile
Rui Bao
ETH Zurich
Author Profile
Jianxing Liu
First Institute of Oceanography,Ministry of Natural Resources (MNR) , China
Author Profile
Yanan Zhang
Center for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Author Profile
Xuesong Wang
Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences
Author Profile
Yuanhao Liu
Center for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Author Profile
Xiaoyu Liu
Center for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Author Profile
Ying Zhao
Center for Marine Magnetism (CM2), Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, PR China
Author Profile
Shiying Li
Guangdong Marine Geological Survey, Guangzhou 510080, China
Author Profile
Qingsong Liu
South University of Science and Technology of China
Author Profile

Abstract

Tropical marginal seas host important sedimentary archives that may be exploited to reveal past changes in continental erosion, chemical weathering, and ocean dynamics. However, these records can be challenging to interpret due to the complex interactions between climate and particulate transport across ocean margins. For the southern South China Sea over the last 90 kyr, we observe a contrasting temporal relationship between the deposition of clay minerals and magnetic minerals, which were associated with two different hydrodynamic modes. Fine-grained clay minerals can be carried in suspension by ocean currents, leading to a rapid response to regional climate-driven inputs. In contrast, changes in magnetic mineralogy were associated with bedload transport and resuspension, leading to a control by glacial-interglacial sea-level variability. Overall, this study indicates that the transfer pathways and mechanisms imparted by varying hydrodynamic conditions exert a substantial influence on the distribution of terrigenous material in continental shelf and margin sediments.