Holocene Paleosecular Variations Recorded by Relict Magnetic Minerals in the Anoxic Black Sea Sediments

Liu, Jiabo1,2; Nowaczyk, Norbert R.3; Jiang, Xiaodong1; Zhong, Yi1; Wirth, Richard4; Liu, Qingsong1,5,6; Arz, Helge W.7

2022-05-01

10.1029/2022JB024179

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH   影响因子和分区

2169-9313

2169-9356

Continuous paleosecular variations reconstructed from sedimentary archives have remarkably deepened our insights into the dynamics of the Earth's magnetic field as well as the chronological purpose. Nevertheless, to construct reliable sedimentary paleomagnetic records in diagenetic reducing sediments is challenging generally due to the pervasive magnetic mineral diagenesis. The relict magnetic minerals are residuals after diagenesis and probably able to record a depositional remanent magnetization, thus it is worthy to explore their paleomagnetic potentials. For this study, two Black Sea sediment cores covering the past 8 ka were subjected to mineralogical and paleo- and rock magnetic analyses. Paramagnetic pyrite framboids are pervasive in the studied sediments deposited under anoxic bottom water conditions in the Black Sea. In addition, relict magnetic minerals of ferrous hemoilmenite, Fe-Mn and Fe-Cr spinels, and magnetite inclusions are also present in the studied cores. Compared to the previous published paleomagnetic results from the same cores over the last glacial period (20-30 ka) which are dominated by detrital (titano-)magnetite particles, the studied relict magnetic mineral samples exhibit a similar behavior in recording the depositional remanent magnetization. Furthermore, the obtained paleosecular variations spanning the past 8 ka reproduce the high intensity patterns observed in the regional archeomagnetic and volcanic datasets. Thus, the successful reconstruction of paleomagnetic secular variations from the anoxic Black Sea sediments greatly extend the application of paleomagnetism in sediments deposited in water with a reducing sub-surface environments from where paleomagnetic data are generally sparse.

paleosecular variation paleomagnetism

SCI

英语

NI期刊

第一 ; 通讯

German Research Foundation (Deutsche Forschungsgemeinschaft, DFG)["SPP 1266","AR 367/9-1","AR 367/9-2"] ; Chinese Scholarship Council[201506180060] ; China Postdoctoral Science Foundation[2020M682770] ; National Natural Science Foundation of China[42104068,41874078,42176066,92158208] ; Key Laboratory of Marine Geology and Metallogeny, MRN[MGM202003] ; State Key Laboratory of Marine Geology, Tongji University[MGK202102] ; Shenzhen Science and Technology Program[KQTD20170810111725321] ; Shanghai Sheshan National Geophysical Observatory, Shanghai, China[SSKP202101]

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000798254800001

AMER GEOPHYSICAL UNION

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Ctr Marine Magnetism CM2, Dept Ocean Sci & Engn, Shenzhen, Peoples R China
2.MNR, Key Lab Marine Geol & Metallogeny, Qingdao, Peoples R China
3.Helmholtz Ctr Potsdam, GFZ German Res Ctr Geosci, Sect 4-3, Potsdam, Germany
4.Helmholtz Ctr Potsdam, GFZ German Res Ctr Geosci, Sect 3-5, Potsdam, Germany
5.Shanghai Sheshan Natl Geophys Observ, Shanghai, Peoples R China
6.Southern Marine Sci & Engn Guangdong Lab, Guangzhou, Peoples R China
7.Leibniz Inst Balt Sea Res Warnemunde, Marine Geol, Rostock, Germany

Liu, Jiabo,Nowaczyk, Norbert R.,Jiang, Xiaodong,et al. Holocene Paleosecular Variations Recorded by Relict Magnetic Minerals in the Anoxic Black Sea Sediments[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(5).

Liu, Jiabo.,Nowaczyk, Norbert R..,Jiang, Xiaodong.,Zhong, Yi.,Wirth, Richard.,...&Arz, Helge W..(2022).Holocene Paleosecular Variations Recorded by Relict Magnetic Minerals in the Anoxic Black Sea Sediments.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(5).

Liu, Jiabo,et al."Holocene Paleosecular Variations Recorded by Relict Magnetic Minerals in the Anoxic Black Sea Sediments".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.5(2022).