Skip to Main Content
GEOREF RECORD

Evidence for asymmetric accretion and low-angle, planar faults in slow-spreading oceanic crust

Jenny S. Collier, Juan J. Danobeitia, J. P. Canales, R. Dalwood, S. Gadd, N. Hayward, T. J. Henstock, S. Krastel, C. Peirce and A. Watts
Evidence for asymmetric accretion and low-angle, planar faults in slow-spreading oceanic crust
Geology (Boulder) (December 1997) 25 (12): 1075-1078

Abstract

New seismic reflection data in the eastern Atlantic have enabled two large-scale dipping reflectors imaged within Mesozoic ocean crust to be mapped in three dimensions and placed in their sea-floor-spreading context. One of the reflectors dips to the west and extends from a step in the igneous basement to the Moho. The other reflector dips to the east and extends between 4 and 10 km below basement. Both reflectors are oriented approximately parallel to isochrons, lie just north of a 5-km-offset, third-order discontinuity, are planar in cross section, and dip at approximately 30 degrees . We interpret both these reflectors as lithospheric-scale faults formed within the median valley at the axis. We suggest that the lower part of the eastward-dipping fault was "captured" from the North American plate, possibly by rapid propagation of an active volcanic rift across the discontinuity.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 12
Title: Evidence for asymmetric accretion and low-angle, planar faults in slow-spreading oceanic crust
Affiliation: University of Cambridge, Bullard Laboratories, Cambridge, United Kingdom
Affiliation: Charles Darwin Cruise CD82, Scientific PartyInternational
Pages: 1075-1078
Published: 199712
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1997-072446
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N27°30'00" - N28°45'00", W21°30'00" - W20°15'00"
Secondary Affiliation: CSIC, ESP, Spain
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199724
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal