Satellite magnetic anomalies of the Antarctic Wilkes Land impact basin inferred from regional gravity and terrain data

The GRACE gravity and subglacial terrain data of Wilkes Land are consistent with the presence of a mascon produced by giant impact perhaps at the end of the Permian. In contrast to the relatively extensive ice probing radar coverage, aeromagnetic data coverage is limited across the basin. However, M...

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Bibliographic Details
Published in:Tectonophysics 2013-02, Vol.585, p.185-195
Main Authors: von Frese, R.R.B., Kim, H.R., Leftwich, T.E., Kim, J.W., Golynsky, A.V.
Format: Article
Language:English
Subjects:
Basins
CHAMP magnetic anomalies
Crusts
GRACE (experiment)
Gravitation
Magnetic anomalies
Magnetization
Magsat magnetic anomalies
Meteorite impact
Permian-Triassic mass extinction
Satellites
Terrain
Wilkes Land, Antarctica
Ørsted magnetic anomalies
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Summary:The GRACE gravity and subglacial terrain data of Wilkes Land are consistent with the presence of a mascon produced by giant impact perhaps at the end of the Permian. In contrast to the relatively extensive ice probing radar coverage, aeromagnetic data coverage is limited across the basin. However, Magsat, Ørsted, and CHAMP satellite magnetic observations reveal the thinned crust of the impact site to be associated with the largest satellite altitude crustal magnetic anomaly of Antarctica. The underlying region of enhanced magnetization is consistent with the GRACE gravity and BEDMAP terrain data and extends into south-central Australia in a reconstructed Gondwana. The strongly magnetized crust can reflect the impact's thermal enhancement of lower crustal viscous remanent magnetization as well as the production of positively magnetized melt rocks within the fractured crust. ► A giant meteorite impact site in Wilkes Land, East Antarctica is strongly magnetized. ► This result is observed in the Magsat, Ørsted, and CHAMP mission data. ► The impact may have contributed to the greatest mass extinction on earth in the Late Permian.
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2012.09.009