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Book Chapter

Tectonic fabric and hydrothermal activity of Mid-Atlantic Ridge crest (lat 26°N)

By
Peter A. Rona
Peter A. Rona
National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, IS Rickenbacker Causeway, Miami, Florida 33149
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Reginald N. Harbison
Reginald N. Harbison
National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, IS Rickenbacker Causeway, Miami, Florida 33149
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Bobby G. Bassinger
Bobby G. Bassinger
National Oceanic and Atmospheric Administration, Atlantic Oceanographic and Meteorological Laboratories, IS Rickenbacker Causeway, Miami, Florida 33149
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Robert B. Scott
Robert B. Scott
Department o f Geology, Texas Ju M University, College Station, Texas 77843
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Andrew J. Nalwalk
Andrew J. Nalwalk
Marine Sciences Institute, University of Connecticut Groton, Connecticut 06340
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Published:
January 01, 1976

Abstract

An asymmetric tectonic fabric was delineated by narrow-beam bathymetric profiles in a 180-km2 area of the Mid- Atlantic Ridge crest at lat 26°N. Features of the tectonic fabric are a continuous rift valley offset by small (<10-km) transform faults and minor fracture zones expressed as valleys with intervening ridges that trend normal and oblique to the two sides of the rift valley. The discharge zone of a postulated sub-sea-floor hydrothermal convection system is focused by faults on the southeast wall of the rift valley and driven by intrusive heat sources beneath the rift valley.

The rift valley has a double structure consisting of linear segments, bounded by ridges, and basins at the intersections of the minor fracture zones. The double structure of the rift valley acts like a template that programs the reproduction of the tectonic fabric. The minor fracture zones form an asymmetric V about the rift valley at variance with the symmetric small circles formed by major fracture zones. To reconcile the asymmetry of minor fracture zones with the symmetry of major fracture zones, it is proposed that the minor fracture zones have been preferentially reoriented by an external stress field attributed to interplate and intraplate motions. Major fracture zones remain symmetric under the same stress field owing to differential stability between minor and major structures of oceanic lithosphere. Key words: oceanic ridges, Mid-Atlantic Ridge, tectonic fabric, fratture zones, transform faults, rift valley, hydrothermal activity, hydrothermal mineral deposits, sub-sea-floor hydrothermal convection system.

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GSA Microform Publications

Mid-Atlantic Ridge

Peter A. Rona
Peter A. Rona
National Oceanic and Atmospheric Administration Atlantic Oceanographic and Meteorological Laboratories 15 Rickenbacker Causeway Miami, Florida 33149
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Geological Society of America
Volume
5
ISBN electronic:
9780813759050
Publication date:
January 01, 1976

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