CONDITIONS FOR CONJUGATED STRUCTURES OF DIAMANTINE AND LABUAN IN THE SOUTHEASTERN PARTOF THE INDIAN OCEAN (PHYSICAL MODELING)

Abstract

Conjugated Diamantin and Labuan structures located in the southeastern part of the Indian Ocean were formed as a result of the split of a single Australian-Antarctic continent and the continental rift movement towards the oceanic lithosphere of the Indian Ocean. The old oceanic lithosphere rift-induced destruction resulted in the formation of a new Southeast Indian spreading ridge. Areas of its initial formation on the old oceanic lithosphere record the Diamantin and Labuan suture zones separating blocks of the young and old lithosphere that in turn are expressed in an abruptly dissected topography and high-amplitude gravity anomalies. Experimental studies showed the formation of the conjugated zones of Diamantin and Labuan had occurred during the destruction of a powerful lithosphere under very slow stretching and spreading conditions.