Abstract
The northern part of the Bogota peninsula belonging to the ultramafic nappe of New Caledonia shows peculiar features drastically contrasting with those in the surrounding peridotites. Within 10-15 km the foliations rotate in azimuth and become vertical. In the center of the peninsula highly sheared peridotites extend over 3 km. From structural and petrological studies, the peninsula is interpreted as a dextral shear zone, exhibiting syntectonic injection of magmatic dikes and hydrothermal alteration. The shear motion occurred in the oceanic upper mantle at temperatures between 500°C and 900°C. The overall geometry strongly supports the interpretation of a transform fault environment.
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