Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial

Wang，Haosen1; Xu，Xing2; Gai，Congcong1; Liu，Jiabo1; Zhong，Yi1; Jiang，Xiaodong1; Zhang，Yanan1; Ferré，Eric C.3; He，Kuang4; Liu，Qingsong1,5,6

2022-07-28

10.1029/2022GL098507

GEOPHYSICAL RESEARCH LETTERS   Impact Factor & Quartile

0094-8276

1944-8007

The relationships among the abundance of magnetofossils, the ensuing magnetic properties, and the controlling paleoenvironmental factors in marine sediments remain broadly unexplored. Here, we identify magnetofossils in core XB1 from the northwestern South China Sea (SCS) since end of the Last Glacial. Using rock magnetic and electron microscopic data, we propose a model that links the anisotropy of magnetic susceptibility fabric and the abundance of magnetofossils. The magnetofossil concentration in sediments increases significantly during the 14.7-4.7 ka period, which in turns leads to inverse magnetic fabrics and near-horizontal of the minimum magnetic susceptibility axes. Further, we show that the abundance of magnetofossils is linked to paleoenvironmental changes in the northwestern SCS. The production and preservation of magnetofossils during the 14.7-4.7 ka period are promoted by an intensified East Asian summer monsoon and sluggish deep-water ventilation, while the paucity of magnetofossils after 4.7 ka is attributed to high oxygen content.

magnetic fabrics magnetofossils South China Sea East Asian monsoon rock magnetism

SCI ; EI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundation of China["92158208","41874078","42104068","42176066"] ; Shenzhen Science and Technology Program[KQTD20170810111725321] ; opening foundation of the Shanghai Sheshan National Geophysical Observatory (Shanghai, China)[SSKP202101] ; opening foundations of the Key Laboratory of Marine Geology and Metallogeny, MRN[MGM202003] ; China Postdoctoral Science Foundation[2020M682770]

Geology

Geosciences, Multidisciplinary

WOS:000834815500001

AMER GEOPHYSICAL UNION

20223112469911

Atmospheric thermodynamics ; Glacial geology ; Magnetic anisotropy ; Magnetism ; Submarine geology

Atmospheric Properties:443.1 ; Oceanography, General:471.1 ; Geology:481.1 ; Thermodynamics:641.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Physical Properties of Gases, Liquids and Solids:931.2

GEOSCIENCES

2-s2.0-85135199817

Web of Science

1.Centre of Marine Magnetism (CM²),Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Guangzhou Marine Geological Survey,China Geological Survey,Guangzhou,China
3.School of Geosciences,University of Louisiana at Lafayette,Lafayette,United States
4.Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Lab of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao,China
5.Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology (Qingdao),Qingdao,China
6.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,China

Wang，Haosen,Xu，Xing,Gai，Congcong,et al. Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(14).

Wang，Haosen.,Xu，Xing.,Gai，Congcong.,Liu，Jiabo.,Zhong，Yi.,...&Liu，Qingsong.(2022).Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial.GEOPHYSICAL RESEARCH LETTERS,49(14).

Wang，Haosen,et al."Inverse Magnetic Fabrics Caused by Magnetofossils in the Northwestern South China Sea Since End of the Last Glacial".GEOPHYSICAL RESEARCH LETTERS 49.14(2022).