Preliminary attempt to characterize the rotation of seafloor in the Pito Deep area of the Easter Microplate using a submersible magnetometer |
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| Authors: | RN Hey F Martinez S Diniega DF Naar J Francheteau R Armijo M Constantin JP Cogné J Girardeau R Hekinian R Searle |
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| Institution: | (1) Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, Hawaii 96822, USA;(2) Present address: California Institute of Technology, Pasadena, California 91125, USA;(3) Department of Marine Science, University of South Florida, St. Petersburg, Florida 33701, USA;(4) Institut Universitaire Européen de la Mer, Université de Bretagne Occidentale, 29280 Plouzané, France |
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| Abstract: | Several mechanisms have been proposed to account for the rotation of the nearly north-south abyssal hill fabric formed on the East Pacific Rise north of the Easter Microplate to the nearly east-west trends in the northern microplate interior. Proposed mechanisms include rigid microplate rotation, transform fault – parallel shear, and bookshelf faulting during the transfer of lithosphere from the Nazca Plate to the microplate. We used a submersible magnetometer on a NAUTILE dive program to measure the magnetic vector rotation of a pillow basalt and dike spur near Pito Deep, the present location of the tip of the propagating rift system that created the microplate. Our results, although too limited to draw strong conclusions from, suggest clockwise rotations of the seafloor magnetic vectors inconsistent with the transform-parallel shear model, and larger than can be explained solely by rigid microplate rotation. |
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