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Redistribution of the lithosphere deformation by the emplacement of underplated mafic bodies; implications for microcontinent formation

Tadashi Yamasaki and Laurent Gernigon
Redistribution of the lithosphere deformation by the emplacement of underplated mafic bodies; implications for microcontinent formation
Journal of the Geological Society of London (September 2010) 167 (5): 961-971

Abstract

Sedimentary basin migration and microcontinent formation could be the result of deformation redistribution, in which the emplacement of an underplated mafic body (UPMB) may play an important role. In this study, a 2D finite-element model is used to examine the redistribution of the deformation that can be triggered by a UPMB. It is shown that three modes of deformation redistribution can exist: (1) a shift-completed mode where the deformation is completely redistributed into the newly weakened region; (2) a transition mode where the deformation is redistributed, but extension is accommodated by thinning in both regions; (3) a shift-failed mode where the deformation is not redistributed. Whether or not the deformation is redistributed depends on the configuration of the UPMB and on the initial rheological heterogeneity in the initially deformed region. However, it becomes difficult for any UPMB to initiate the redistribution of the deformation once the stretching factor in the first deformed region exceeds a critical value. The microcontinent formations observed in the Indian Ocean, in the Norwegian-Greenland Sea, in the Red Sea-Afar region and in the western Mediterranean are particularly discussed in relation to the transition mode, providing some important geodynamic implications.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 167
Serial Issue: 5
Title: Redistribution of the lithosphere deformation by the emplacement of underplated mafic bodies; implications for microcontinent formation
Affiliation: University of Leeds, School of Earth and Environment, Leeds, United Kingdom
Pages: 961-971
Published: 201009
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 87
Accession Number: 2010-087204
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., 1 table, sketch maps
S05°00'00" - S05°00'00", E55°00'00" - E55°00'00"
N34°00'00" - N46°00'00", W02°00'00" - E18°00'00"
N60°00'00" - N74°00'00", W25°00'00" - E10°00'00"
N10°00'00" - N16°00'00", E38°00'00" - E46°00'00"
Secondary Affiliation: Geological Survey of Norway, NOR, Norway
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201046
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