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On the intriguing subject of the small amplitudes of magnetic anomalies at the Powell Basin (Antarctica)

Urheber*innen

Catalán,  Manuel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Negrete-Aranda,  Raquel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Martos,  Yasmina M.
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Neumann,  Florian
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Santamaría,  Alberto
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fuentes-Bustillo,  Karina
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Zitation

Catalán, M., Negrete-Aranda, R., Martos, Y. M., Neumann, F., Santamaría, A., Fuentes-Bustillo, K. (2023): On the intriguing subject of the small amplitudes of magnetic anomalies at the Powell Basin (Antarctica), XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0558


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016915
Zusammenfassung
The Powell Basin is a small oceanic basin bounded by continental blocks that fragmented during drifting of South America from Antarctica. The basin is limited to the east by the South Orkney Microcontinent, to the north by the South Scotia Ridge, and to the west by the Antarctic Peninsula. The timing of its opening is poorly constrained due to low amplitude magnetic anomalies which hampers their identification and cause large uncertainties in proposed ages that range from the Late Eocene to Early Miocene. The Powell basin has been extensively studied using a variety of geophysical methods including seismic, gravity and magnetic surveys intended to unveil the tectonic domains. The magnetic anomalies and the thermal regime of the basin are of particular interest, as some of these studies have suggested that the absence of clear seafloor magnetic anomalies is the result of impermeable layers that prevent the venting of hot fluids into the water column. Using new magnetic and heat flow data together with geophysical data from international databases, we analyze the thermal structure of the Powell Basin its lithosphere and the upper mantle dynamics and discuss the probable causes of the abnormally small amplitudes of magnetic anomalies.