Formation and preservation of greigite (Fe3S4) in a thick sediment layer from the central South Yellow Sea

Liu, Jianxing1,2; Mei, Xi2,3; Shi, Xuefa1,2; Liu, Qingsong2,4; Liu, Yanguang1,2; Ge, Shulan1,2

2018-04

10.1093/gji/ggx556

GEOPHYSICAL JOURNAL INTERNATIONAL   影响因子和分区

0956-540X

1365-246X

Sediments from continental shelves are sensitive to changes in both oceanic and terrestrial conditions, and, therefore, magnetic minerals in such sediments are affected strongly by depositional and diagenetic processes. Here, we investigated systematically an N-S transect of three sediment cores from the central South Yellow Sea (SYS) muddy area. Magnetic data indicate the presence of a horizontally distributed thick greigite-bearing layer. From an age model based on published magnetostratigraphy, accelerator mass spectrometry C-14 dating ages, sedimentary characteristics and foraminiferal analysis, this layer was deposited within marine isotope stages (MIS) 17-13, following an enhanced sulphidic period over MIS 21-19 when the YS Warm Current and the associated YS Cold Water Mass were strong and where underlying sediments have higher total organic carbon, total sulphur and trace element molybdenum contents. Trace element cadmium enrichment in the greigite-bearing layers is documented for the first time, which indicates that weakly sulphidic (i.e. with trace levels of free 1125) conditions existed before greigite formed in a sulphidic environment during early diagenesis. It also indicates that subsequent conditions free of oxygen and H2S after greigite formation are more favourable for its preservation. We propose that organic matter supply was controlled over an extended period by moderate primary productivity. The combined effects of palaeoclimate and local tectonic subsidence were crucial for the formation and preservation of the identified greigite. In brief, our study improves understanding of the formation and preservation mechanisms of greigite in continental shelf sediments and reveals mid-Pleistocene palaeoenvironmental changes in the SYS.

Sea level change Environmental magnetism Rock and mineral magnetism

SCI ; EI

英语

其他

China Geological Survey[GZH200800501] ; China Geological Survey[1212011220113]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000448715000009

OXFORD UNIV PRESS

20180704798388

Glacial geology ; Magnetism ; Mass spectrometry ; Minerals ; Organic carbon ; Particle accelerator accessories ; Sea level ; Sedimentology ; Sediments ; Trace elements

Oceanography, General:471.1 ; Geology:481.1 ; Minerals:482.2 ; Soil Mechanics and Foundations:483 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Chemistry:801 ; Organic Compounds:804.1 ; Particle Accelerators:932.1.1

GEOSCIENCES

Web of Science

1.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266061, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Qingdao Inst Marine Geol, Qingdao 266071, Peoples R China
4.Southern Univ Sci & Technol, Dept Ocean Sci & Engn, Shenzhen 518055, Peoples R China

Liu, Jianxing,Mei, Xi,Shi, Xuefa,et al. Formation and preservation of greigite (Fe3S4) in a thick sediment layer from the central South Yellow Sea[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,213(1):135-146.

Liu, Jianxing,Mei, Xi,Shi, Xuefa,Liu, Qingsong,Liu, Yanguang,&Ge, Shulan.(2018).Formation and preservation of greigite (Fe3S4) in a thick sediment layer from the central South Yellow Sea.GEOPHYSICAL JOURNAL INTERNATIONAL,213(1),135-146.

Liu, Jianxing,et al."Formation and preservation of greigite (Fe3S4) in a thick sediment layer from the central South Yellow Sea".GEOPHYSICAL JOURNAL INTERNATIONAL 213.1(2018):135-146.