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Transform margin rift architecture; an example from the Brazilian equatorial margin

Ana Krueger, Katya Casey, Kevin Burke, Mike Murphy and Renato Darros de Matos
Transform margin rift architecture; an example from the Brazilian equatorial margin (in Petroleum systems in 'rift' basins, Paul J. Post (editor), James Coleman (editor), Norman C. Rosen (editor), David E. Brown (editor), Tina Roberts-Ashby (editor), Peter Kahn (editor) and Mark Rowan (editor))
Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference (December 2015) 34: 576-599

Abstract

The Equatorial Atlantic evolved from a transform margin to an oblique-passive margin from the early rifting to early drifting stages. The entire Equatorial region of the South Atlantic behaved as a global-scale accommodation zone linking the evolving Central and Southern Atlantic ocean basins. Lithospheric keels and the roots of thick, stable Proterozoic cratons worked as an anchor, preventing and postponing the continental rupture. The transition, from a continental transform margin to an oblique- passive margin, lasted approximately 10 m.y. Once oceanic lithosphere started to be created at the main transtensional segments, large offset transform faults developed. Remarkable differences are observed between adjacent basins. Deformation partitioning occurred at the equatorial margin due to the coaxiality of the progressive deformation. Diachronous deformation occurred as a function of the degree of obliquity of each basin at a specific time. Individual segments of the margin are associated with individual strike-slip basins at early rifting stages and have different amounts of obliquity with a decrease in obliquity from south to north. Because, basement faults form and develop during rifting their geometry gets locked at the time of first emplacement of oceanic crust. Therefore, the geometry of the basement and basement faults can be used to reconstruct the geometries of the original strike-slip basins prior to oceanic spreading.


ISSN: 1544-2462
Serial Title: Papers presented at the Gulf Coast Section, Society of Economic Paleontologists and Mineralogists Foundation Annual Bob F. Perkins Research Conference
Serial Volume: 34
Title: Transform margin rift architecture; an example from the Brazilian equatorial margin
Title: Petroleum systems in 'rift' basins
Author(s): Krueger, AnaCasey, KatyaBurke, KevinMurphy, MikeDarros de Matos, Renato
Author(s): Post, Paul J.editor
Author(s): Coleman, James, Jr.editor
Author(s): Rosen, Norman C.editor
Author(s): Brown, David E.editor
Author(s): Roberts-Ashby, Tinaeditor
Author(s): Kahn, Petereditor
Author(s): Rowan, Markeditor
Affiliation: Murphy Oil Corp, Houston, TX, United States
Affiliation: Bureau of Ocean Energy Management, New Orleans, LA, United States
Pages: 576-599
Published: 20151201
Text Language: English
Publisher: Society of Economic Paleontologists, Gulf Coast Section (GCSSEPM) Foundation, Houston, TX, United States
ISBN: 978-1-944966-00-3
Meeting name: 34th GCSSEPM Foundation Bob F. Perkins-Rosen research conference on Petroleum systems in 'rift' basins
Meeting location: Houston, TX, USA, United States
Meeting date: 20151213Dec. 13-16, 2015
References: 33
Accession Number: 2020-013084
Categories: Solid-earth geophysics
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps
S34°00'00" - N05°15'00", W74°00'00" - W34°00'00"
Secondary Affiliation: Univeristy of Houston, USA, United StatesPre-Sal Petroleo, BRA, Brazil
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute.
Update Code: 202009
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