Fracture Zone A, Mid-Atlantic Ridge 37 deg. N: A Near-Bottom Geophysical Study.

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Abstract:

A near-bottom geophysical survey has been made of a small transform fault, designated Fracture Zone A, located on the Mid-Atlantic Ridge near 37N. Morphologically, Fracture Zone A is defined by a broad U-shaped valley that is widest and deepest near its intersection with the adjacent rift valleys. The walls of Fracture Zone A are structurally complex with both E-W and N-S trending scarps however, the main trend of the transform fault valley is determined by several prominent E-W trending scarps giving the valley a graben-like appearance. While the transform fault valley itself is several kilometers in width, the actual zone of decoupling across Fracture Zone A presently occurs over a very narrow and readily identifiable zone. Structural lineations mapped within the transform fault valley generally parallel the trend of the rift valley, indicating that this crust was probably generated by normal sea-floor spreading processes.

Author(s):
Detrick, Robert S.
Author Organization(s):
SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF MARINE PHYSICAL LAB
Descriptive Note:
Summary rept.,
Supplementary Note:
Sponsored in part by Grant NSF-GA-41358.
Pagination:
0014

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SIO-Ref-74-26, MPL-U-54/74
Contract/Grant Number(s):
N00014-69-A-0200-6002, NSF-GA-31377
Project Number(s):
NR-260-103
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*OCEAN BOTTOM, GEOMAGNETISM, BATHYMETRY, SEDIMENT TRANSPORT, OCEAN BOTTOM TOPOGRAPHY, OCEANIC CRUST, MICROSEISMS, TECTONICS
Field(s)/Group(s):
Physical and Dynamic Oceanography, Geology, Geochemistry and Mineralogy
Keyword(s):
*MidAtlantic Ridge, Ocean bottom spreading, Plate tectonics
Report Date:
1974 Oct 01