Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica

Garrett, S.W.; Maslanyj, M.P.; Damaske, D.. 1988 Interpretation of aeromagnetic data from the Ellsworth Mountains-Thiel Mountains ridge, West Antarctica. Journal of the Geological Society, 145 (6). 1009-1017. https://doi.org/10.1144/gsjgs.145.6.1009

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Official URL: http://dx.doi.org/10.1144/gsjgs.145.6.1009

Abstract/Summary

Over 12000 km of new aeromagnetic data, gathered during periods free from auroral disturbances, are presented for an area of 290 000 km2 in West Antarctica, including the majority of the Ellsworth-Whitmore Mountain crustal block. Selection of an appropriate line spacing (20 km) and rigorous diurnal control allowed interpretation of isolated magnetic anomalies by two-dimensional modellìng. Anomalies of 50–500 nT amplitude extend for over 100 km, predominantly with an east-west orientation. They attain their greatest amplitudes over scattered exposures of Middle Jurassic granite, but the measured magnetizations of these rocks (J <0.1 Am−1) are insufficient to match the observed anomalies. It was necessary during modelling to invoke deeper, magnetite-rich, probably mafic plutons (J >0.5 Am−1) beneath the granites. The intrusions probably form part of a widespread bimodal igneous suite created during early stages of continental fragmentation.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1144/gsjgs.145.6.1009
ISSN:	0016-7649
NORA Subject Terms:	Earth Sciences
Date made live:	20 Nov 2018 10:49 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/521628

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1144/gsjgs.145.6.1009

ISSN:

0016-7649

NORA Subject Terms:

Earth Sciences

Date made live:

20 Nov 2018 10:49 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/521628