Geology of the Hubert Miller seamount, Marie Byrd seamounts province, Amundsen Sea, West Antarctic

This work is dedicated to the results of joint Russian-German geodynamic studies carried out in the West Antarctic (areas of the Amundsen Sea, the Southern Ocean, the Marie Byrd seamounts, and the foot of the continental slope of Marie Byrd Land) during cruises 18/5a and 23/4 of the “R/V Polarstern”...

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Bibliographic Details
Published in:Russian journal of Pacific geology 2008-10, Vol.2 (5), p.377-384
Main Authors: Kurentsova, N. A., Udintsev, G. V., Teterin, D. E., Roshchina, I. A.
Format: Article
Language:English
Subjects:
Continental crust
Continental slope
Earth and Environmental Science
Earth Sciences
Geology
Geophysics
Heterogeneity
Ocean floor
Oceanic crust
Oceanography
Plate tectonics
Rifting
Seamounts
Seismology
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Summary:This work is dedicated to the results of joint Russian-German geodynamic studies carried out in the West Antarctic (areas of the Amundsen Sea, the Southern Ocean, the Marie Byrd seamounts, and the foot of the continental slope of Marie Byrd Land) during cruises 18/5a and 23/4 of the “R/V Polarstern” in 2001 and 2006, respectively. The material collected on the Hubert Miller seamount (Marie Byrd seamount) attests to the relict continental appearance of the rocks. This suggests the heterogeneity of the Amundsen seafloor and its formation through a spatiotemporal combination of the destruction of continental crust, progressive thalassogenesis (oceanization-taphrogenesis), and rifting, as opposed to a spreading origin. The high postconsolidation mobility during the destruction stage led to the areal dismembering and high permeability of the continental crust, as well as tectonomagmatic activation. The main process during the reworking of the continental crust is its magmatic substitution by mantle-derived basic-ultrabasic material with subsequent formation of a secondary oceanic crust and preservation of relics of the continental crust. The endogenic activity of the Earth was driven by transmagmatic fluids, which were supplied from the liquid core and caused transformation of the Earth’s crust and mantle.
ISSN:1819-7140
1819-7159
DOI:10.1134/S1819714008050011