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

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概要

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• 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 @/Os052/@rsted 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 @/Os052/@rsted data using crustal thickness variations derived from satellite altitude gravity data. Modeling of the residual @/Os052/@rsted 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.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Kim Jeong

  Department Of Anatomy Wonkwang University School Of Medicine

• Kim Hyung

  Goddard Earth Science And Technology Center (gest) University Of Maryland

• GOLYNSKY Alexander

  VNII Okeangeologia

• TAYLOR Patrick

  Code 698, Planetary Geodynamics Lab, NASA/GSFC

• Frese Ralph

  Department of Geological Sciences and Byrd Polar Research Center, The Ohio State University

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