Synchronous reorientation of the Woodlark Basin spreading center

Details Synchronous reorientation of the Woodlark Basin spreading center Synchronous reorientation of the Woodlark Basin spreading center

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997e%26psl.146..233g&link_type=abstract

Earth and Planetary Science Letters, Volume 146, Issue 1, p. 233-242.

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Scientific paper

A sidescan and multibeam bathymetry survey of the Woodlark Basin reveals that its 500 km long spreading center reoriented synchronously, without propagation, about 80 ka. There is no evidence of the V-shaped pseudofault geometry typical of spreading center propagation, nor of the progressive fanning of seafloor fabric characteristic of spreading center rotation. The reorientation is recognized by a sharp contact between two seafloor fabric trends, and ruptured off-axis lithosphere formed up to 0.7 Myr previously. The length of the reoriented spreading segments and the tendency to fault pre-reorientation seafloor fabric are controlled by the strength of the lithosphere, the angle of the reorientation, and the length of pre-existing spreading and transform segments. We document the process of synchronous reorientation in the Woodlark Basin and propose that it may occur in other ocean basins.

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