Ridge segmentation, faulting and crustal thickness in the Atlantic Ocean

Article Abstract:

A topographical map of normal faults in the Mid-Atlantic Ridge (MAR) between the Kane and Atlantis fracture zones was deduced from Sea Beam bathymetry. Topographic curvature was measured to differentiate on- and off-ridge faults from constructional volcanism. Large-throw faults were strongly associated with highs in the mantle Bouguer gravity anomaly field, indicating that amagmatic extension on the large faults helps to thin the crust at the ends of MAR's segments. The normal faults' growth appears to create abyssal hill lineations at the rift valley walls.

Faults (Geology), Atlantic Ocean, Marine geophysics, Mid-Atlantic Ridge, Submarine topography

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Palaeomagnetic evidence for large-magnitude, low-angle normal faulting in a metamorphic core complex

Article Abstract:

Paleomagnetic data gathered in the South Mountains of the western US confirm that its master detachment fault was active there during large-magnitude extensional deformation. Data from samples taken from undeformed Cenozoic metamorphic core complexes were compared with expected directions of the geomagnetic field and no evidence was found for tilting of the footwall. Thus, conjectures that tilting took place after the extensional deformation are laid to rest.

Models, Magnetic properties, Paleogeophysics, Rocks, Paleomagnetism

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Active out-of-sequence thrust faulting in the central Nepalese Himalaya

Article Abstract:

The in situ cosmogenic (super 10)Be data indicating a fourfold increase in millennial timescale erosion rates occurring over a distance of less than 2 km in central Nepal, delineating for the first time an active thrust fault nearly 100Km north of the surface expression of the Main Himalayan Thrust (MHT) is presented. The results indicate persistent exhumation above deep-seated, surface-breaking structures at the foot of the high Himalaya.

Nepal, Observations, Thrust faults (Geology), Thrust faults, Erosion, Erosion (Geology)

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