Characteristics and evolution of the segmentation of the mid-Atlantic Ridge between 20 deg N and 24 deg N during the last 10 million years

Details Characteristics and evolution of the segmentation of the mid-Atlantic Ridge between 20 deg N and 24 deg N during the last 10 million years Characteristics and evolution of the segmentation of the mid-Atlantic Ridge between 20 deg N and 24 deg N during the last 10 million years

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995e%26psl.129...55g&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 129, no. 1-4, p. 55-71

Other

56

Atlantic Ocean, Mid-Ocean Ridges, Northern Hemisphere, Ocean Bottom, Planetary Evolution, Structural Basins, Tectonics, Bathymeters, Crustal Fractures, Geomagnetism, Magma

Scientific paper

High-resolution bathymetry and geophysical data collected along the slow-spreading axis and flanks of the Mid-Atlantic Ridge between 20 deg N and 24 deg N reveal the characteristics and history of different wavelengths of segmentation during the last 10 m.y. The bathymetric data exhibit a morphotectonic pattern dominated by ridge-normal and oblique bathymetric lows that partition the ridge flanks into rhomb-shaped areas of relatively high elevation. At least four different types of oblique bathmetric lows have been identified which represent the off-axis traces of axial discontinuities and suggest a complex and ongoing evolution of ridge-axis segmentation. One group of oblique structures is represented by two deep ridge-normal depressions with typical fracture zone characteristics that are connected to the present active transform by oblique depressions near the ridge axis. Two other types of oblique structures correspond to elongate bathymetric lows and oblique alignments of ridge-parallel bathymetric lows symmetric about he ridge axis. Both types of oblique structures frequently change their orientation (from normal to subparallel to the ridge axis) and appear to merge and diverge off-axis. These oblique depressions are characterized by positive filtered mantle Bouguer anomalies, high magnetizations, complex magnetic anomaly patterns, and possible exposure of mantle lithologies. The ridge segments defined by these oblique depressions lengthen or shorten along the ridge axis, with propagation rates varying from 0 to 25 km/m.y. We propose a model which accounts for the punctuated injection of magma and the evolution of elementary segments of accretion over periods of several million years.

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