Abstract

We show that the 33 km long Gölbaºi basin on the East Anatolian fault zone marks the triple junction between the African, Arabian. and Turkish plates. The main strand of the Turkish–Arabian plate boundary, the Göksu fault, enters this basin from the ENE before splaying to form faults which develop farther southwest into the Turkish–African and African-Arabian boundaries. The Gölbaþi Türkođu fault, the Turkish–African boundary, is shown to have slipped 16 km; the prevously unrecognised Kirkpmar fault. the African–Arabian boundary, has slipped 17 km. We propose that this fault geometry developed at c. 3 Ma following earlier slip, starting at c. 5 Ma, on other strike-slip faults nearby which marked the start of westward motion of the Turkish plate.

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