Remanence acquisition efficiency in biogenic and detrital magnetite and recording of geomagnetic paleointensity

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  • Liang Chen
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • David Heslop
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Andrew P. Roberts
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Liao Chang
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Xiang Zhao
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Helen V. McGregor
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Gianluca Marino
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Laura Rodriguez‐Sanz
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Eelco J. Rohling
    Research School of Earth Sciences Australian National University Canberra Australian Capital Territory Australia
  • Heiko Pälike
    Center for Marine Environmental Sciences, University of Bremen Bremen Germany

書誌事項

公開日
2017-04
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#am
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016gc006753
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>Relative paleointensity (RPI) variations of Earth's magnetic field are widely used to understand geomagnetic field behavior and to develop age models for sedimentary sequences. RPI estimation is based on a series of assumptions. One key assumption that is rarely considered is that all magnetic particles in the sediment acquired a magnetization in an identical manner. In this paper, we test this assumption for sediments from the eastern equatorial Pacific Ocean that record well‐documented global RPI variations over the last ∼780 kyr. The magnetization is carried by two stable single domain magnetic components, which we identify as magnetite magnetofossils and titanomagnetite nanoparticle inclusions within larger silicate particles. By analyzing signals carried by the two components separately, we determine for the first time that magnetic nanoparticle inclusions can cause their host particles to record reliable but inefficient sedimentary paleomagnetic signals. The magnetization carried by biogenic magnetite is acquired more efficiently than that carried by the nanoparticle inclusions. Variations in the concentration of both components are modulated climatically so that they record nearly identical RPI signals. In many sediment types, there is no correlation between the concentrations of different magnetic components so that variable remanence acquisition efficiency will complicate RPI recording. Our work demonstrates that detailed assessment of paleomagnetic recording by each constituent magnetic component needs to become a routine part of sedimentary RPI analysis.</jats:p>

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