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Crustal analysis of maud rise from combined satellite and near-surface magnetic survey data

Earth, Planets and Space volume 57, pages717–726(2005)Cite this article

Abstract

We produced a crustal magnetization model for the Maud Rise in the southwest Indian Ocean off the coast of East Antarctica using magnetic observations from the Ørsted satellite and near-surface surveys complied by the Antarctic Digital Magnetic Anomaly Project (ADMAP). Joint inversion of the two anomaly fields suggests that the magnetic effects due to crustal thickness variations and remanence involving the normal polarity Cretaceous Quiet Zone (KQZ) dominate at satellite altitude (~700 km). The crustal thickness effects were modeled in the Ørsted data using crustal thickness variations derived from satellite altitude gravity data. Modeling of the residual Ørsted and near-surface magnetic anomalies supports extending the KQZ eastwards to the Astrid Ridge. The remaining near-surface anomalies involve crustal features with relatively high frequency effects that are strongly attenuated at satellite altitudes. The crustal modeling can be extended by the satellite magnetic anomalies across the Indian Ocean Ridge for insight on the crustal properties of the conjugate Agulhas Plateau. The modeling supports the Jurassic reconstruction of Gondwana when the African Limpopo-Zambezi and East Antarctic Princess Astrid coasts were connected as part of a relatively demagnetized crustal block.

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Affiliations

  1. Goddard Earth Science and Technology, University of Maryland, Baltimore County at Planetary Geodynamics Lab, NASA/GSFC, Greenbelt, Maryland, USA

    Hyung Rae Kim

  2. Department of Geological Sciences, The Ohio State University, Columbus, Ohio, USA

    Ralph R. B. von Frese

  3. VNII Okeangeologia, St. Petersburg, Russia

    Alexander V. Golynsky

  4. Planetary Geodynamics Lab, NASA/GSFC, Code 698, Greenbelt, Maryland, USA

    Patrick T. Taylor

  5. Department of Geoinformatic Engineering, Sejong University, Seoul, South Korea

    Jeong Woo Kim

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  1. Hyung Rae Kim
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  2. Ralph R. B. von Frese
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  3. Alexander V. Golynsky
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  4. Patrick T. Taylor
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  5. Jeong Woo Kim
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Correspondence to Hyung Rae Kim.

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Kim, H.R., von Frese, R.R.B., Golynsky, A.V. et al. Crustal analysis of maud rise from combined satellite and near-surface magnetic survey data. Earth Planet Sp 57, 717–726 (2005). https://doi.org/10.1186/BF03351851

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Key words

  • Maud Rise
  • Magnetic anomaly
  • Antarctic geology
  • Aeromagnetic data
  • Orsted
  • tectonic reconstructions