@misc{10481/64815,
year = {2020},
month = {10},
url = {http://hdl.handle.net/10481/64815},
abstract = {Rifting of continental lithosphere leading to oceanic basins is a complex process conditioned by
different factors such as the rheology and thermal structure of the underlying lithosphere, as well
as underlying asthenospheric dynamics. All these processes, which finally lead to oceanic
domains, can better be recognized in small oceanic basins. Powell Basin is a small oceanic basin
bounded to the north by the South Scotia Ridge, to the east by the South Orkney Microcontinent,
and to the west by the Antarctic Peninsula. It was formed between the Oligocene and Miocene,
however, its age is not well defined, among other reasons due to the small amplitude of its
spreadingmagnetic anomalies. This basin is an ideal framework to analyze the different rifting and
spreading phases, which leads from continental crust to the formation of an oceanic domain
through different extensional regimes. To identify the different boundaries during the formation of
Powell Basin from the beginning of the rifting until the end of the spreading, we use different data
sources: magnetic, gravity, multichannel seismic profiles and bathymetry data. We use seismic
and bathymetry data to estimate the Total Tectonic Subsidence. Total Tectonic Subsidence has
proven to be useful to delineate the different tectonic regimes present from early rifting to the
formation of oceanic seafloor. This result together with magnetic data has been used to delimit the
oceanic domain and compare with previous authors’ proposals. This method could be applied in
any other basin or margin to help delimiting its boundaries. Finally, we analyze the role that an
asthenospheric branch intruding from the Scotia Sea played in the evolution of the magnetic
anomaly signature on an oceanic basin.},
organization = {Project "Estructura Litosferica y Geodinamica de Powell-Drake-Bransfield Rift" under the umbrella of the Programa Estatal de I + D + i Orientada a los Retos de la Sociedad of the Spanish Ministry of Science 	
RTI 2018-099615-B-100},
organization = {Project "Timing and main tectonic processes involved in the onset and evolution of the Antarctic Circumpolar Current (ACC): development of continental margins and oceanic basins" under the umbrella of the Programa Estatal de I + D + i of the Spanish Minist 	
CTM 2017-89711-C2-2-P},
publisher = {Frontiers Media SA},
keywords = {Heat flow},
keywords = {Magnetic anomaly},
keywords = {Continent-ocean boundary},
keywords = {Bouguer gravity anomaly},
keywords = {Asthenospheric channel},
keywords = {Total tectonic subsidence},
title = {Unveiling Powell Basin’s Tectonic Domains and Understanding Its Abnormal Magnetic Anomaly Signature. Is Heat the Key?},
doi = {10.3389/feart.2020.580675},
author = {Catalán, M. and Martos, Y. M. and Galindo Zaldívar, Jesús and Perez, L. F. and Bohoyo, F.},
}