Abstract
We present a new magnetic compilation for Central Gondwana conformed to a recent satellite magnetic model (LCS-1) with the help of an equivalent layer approach, resulting in consistent levels, corrections that have not previously been applied. Additionally, we use the satellite data to its full spectral content, which helps to include India, where high resolution aeromagnetic data are not publically available. As India is located north of the magnetic equator, we also performed a variable reduction to the pole to the satellite data by applying an equivalent source method. The conformed aeromagnetic and satellite data are superimposed on a recent deformable Gondwana plate reconstruction that links the Kaapvaal Craton in Southern Africa with the Grunehogna Craton in East Antarctica in a tight fit. Aeromagnetic anomalies unveil, however, wider orogenic belts that preserve remnants of accreted Meso- to Neoproterozoic crust in interior East Antarctica, compared to adjacent sectors of Southern Africa and India. Satellite and aeromagnetic anomaly datasets help to portray the extent and architecture of older Precambrian cratons, re-enforcing their linkages in East Antarctica, Australia, India and Africa.
Highlights
We present a new magnetic compilation for Central Gondwana conformed to a recent satellite magnetic model (LCS-1) with the help of an equivalent layer approach, resulting in consistent levels, corrections that have not previously been applied
Such reconstructions were used to discuss the structural setting of East Antarctica with respect to the setting of Southern Australia and showed that the magnetic data indicate the continuation of the Australian geology under the ice of Antarctica[10,11,12]
It has been already discussed that the Beattie anomaly can be linked to an anomaly with similar amplitude and trend in Dronning Maud Land, Antarctica[37] that sharply terminates along the western orogenic front of the East African O rogen[38,39,40]
Summary
We present a new magnetic compilation for Central Gondwana conformed to a recent satellite magnetic model (LCS-1) with the help of an equivalent layer approach, resulting in consistent levels, corrections that have not previously been applied. Previous studies have shown that magnetic data, especially when interpreted jointly with geochronological, geochemical, geophysical and palaeomagnetic datasets, helps identifying fundamental links between formerly adjacent neighbours within the Gondwana, Rodinia and Columbia supercontinents[5,6] These links are highly relevant for global supercontinent studies as current plate reconstructions still vary considerably, both in terms of defining the relative positions and the tectonic processes that affected different continents. In this context, Antarctica has a special role as it holds a key position in a Gondwana framework[7,8,9] but its geology is mostly hidden under its thick ice cover.
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