Interpretation of Anhysteretic Remanent Magnetization Carriers in Magnetofossil-Rich Marine Sediments

Zhang，Qiang1; Roberts，Andrew P.2; Ge，Shulan3,4; Liu，Yanguang3,4; Liu，Jianxing3,4; Liu，Shuangchi1; Tang，Xu1; Wang，Haosen5; Wang，Dunfan5; Li，Jinhua1; Liu，Qingsong5

2022-11-01

10.1029/2022JB024432

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

2169-9313

2169-9356

The anhysteretic remanent magnetization (ARM) is an important magnetic parameter for quantifying the concentration of “fine”, mostly sub-micron ferrimagnetic particles in rocks and sediments. A sound understanding of ARM carriers is needed to interpret magnetic and environmental information in sedimentary archives. This is often not achieved for marine sediments, which routinely contain several magnetic mineral components. Here, we analyze marine sediment records over different timescales for four sediment cores from the Eastern Pacific Ocean (Hole 1218A), the Antarctic margin (core P4-1), the Arctic Ocean (core ARC5-ICE4), and the South China Sea (core L07), using coercivity spectra analyses of ARM, first-order reversal curve principal component analysis (FORC-PCA), transmission electron microscopy (TEM), and unmixing of isothermal remanent magnetization (IRM) curves. By combining rock magnetic and TEM results, we find that the ARM is mainly carried by non-interacting single domain (SD) biogenic magnetite (magnetofossils) in the studied sediments over all timescales. Low-coercivity magnetic particles (detrital and fine-grained extracellular magnetite) also contribute to the bulk ARM. Variable magnetofossil chain structures are detected and have a significant influence on ARM data interpretation. Quantitative FORC-PCA endmember analyses based on quantile contours and coercivity distributions provide valuable information on the nature of endmembers and improve ARM data interpretation. We provide an integrated strategy to help reduce interpretational ambiguities related to ARM in future studies.

first-order reversal curve magnetic minerals rock magnetism

SCI

英语

NI论文

通讯

China Postdoctoral Science Foundation[2020M680026];National Natural Science Foundation of China[41876070];National Natural Science Foundation of China[41920104009];National Natural Science Foundation of China[42104076];National Postdoctoral Program for Innovative Talents[BX20200332];Australian Research Council[DP200100765];

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000928052400021

AMER GEOPHYSICAL UNION

GEOSCIENCES

2-s2.0-85142883723

Scopus

1.State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,China
2.Research School of Earth Sciences,Australian National University,Canberra,Australia
3.Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,MNR,Qingdao,China
4.Laboratory for Marine Geology,Pilot National Laboratory for Marine Science and Technology,Qingdao,China
5.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China

Zhang，Qiang,Roberts，Andrew P.,Ge，Shulan,et al. Interpretation of Anhysteretic Remanent Magnetization Carriers in Magnetofossil-Rich Marine Sediments[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2022,127(11).

Zhang，Qiang.,Roberts，Andrew P..,Ge，Shulan.,Liu，Yanguang.,Liu，Jianxing.,...&Liu，Qingsong.(2022).Interpretation of Anhysteretic Remanent Magnetization Carriers in Magnetofossil-Rich Marine Sediments.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,127(11).

Zhang，Qiang,et al."Interpretation of Anhysteretic Remanent Magnetization Carriers in Magnetofossil-Rich Marine Sediments".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 127.11(2022).