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Tectonic evolution of Gorda Ridge inferred from sidescan sonar images

Marine Geophysical Researches

By:
, ,
DOI: 10.1007/BF00310064

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Abstract

Gorda Ridge is the southern segment of the Juan de Fuca Ridge complex, in the north-east Pacific. Along-strike spreading-rate variation on Gorda Ridge and deformation of Gorda Plate are evidence for compression between the Pacific and Gorda Plates. GLORIA sidescan sonographs allow the spreading fabric associated with Gorda Ridge to be mapped in detail. Between 5 and 2 Ma, a pair of propagating rifts re-orientated the northern segment of Gorda Ridge by about 10?? clockwise, accommodating a clockwise shift in Pacific-Juan de Fuca plate motion that occurred around 5 Ma. Deformation of Gorda Plate, associated with southward decreasing spreading rates along southern Gorda Ridge, is accommodated by a combination of clockwise rotation of Gorda Plate crust, coupled with left-lateral motion on the original normal faults of the ocean crust. Segments of Gorda Plate which have rotated by different amounts are separated by narrow deformation zones across which sharp changes in ocean fabric trend are seen. Although minor lateral movement may occur on these NW to WNW structures, no major right-lateral movement, as predicted by previous models, is observed. ?? 1988 Kluwer Academic Publishers.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Tectonic evolution of Gorda Ridge inferred from sidescan sonar images
Series title:
Marine Geophysical Researches
DOI:
10.1007/BF00310064
Volume
10
Issue:
3-4
Year Published:
1988
Language:
English
Publisher location:
Kluwer Academic Publishers
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Marine Geophysical Researches
First page:
191
Last page:
204
Number of Pages:
14