The Kerguelen Province revisited: Additional constraints on the early development of the Southeast Indian Ocean

摘要: The Kerguelen Province, consisting of two oceanic plateaus (Kerguelen, Broken Ridge) and three basins (Enderby, Labuan Diamantina), covers a large area ocean floor in the southeast Indian Ocean. As very few magnetic anomalies have been identified this only basement ages from Plateau are known, reconstruction models Province not well constrained. In an effort to gain more understanding about evolution area, we used satellite gravity identify additional fracture zones. they likely be associated with high frequency low amplitude anomalies, computed vertical derivative map instead regular map. Using approach, series zones Enderby Basin, which aligned Mesozoic Perth Basin converge Fracture Zone. conjugate Bay Bengal, traced equivalent pattern which, together, better constrain early part Synthesis these images other available data suggests that spreading India both Australia Antarctica is closely related. Spreading between continents appears begun same time, Cretaceous thus, accretion some parts must occurred before onset quiet period at 118 Ma. At 96–99 Ma, when direction Ocean had changed into N-S direction, it also took place throughout Province. We find previously proposed slow Diamantina Zone Basins, Ma initiation Southeast Ridge 43 could taken place. Furthermore, suggest there growing evidence true for eastward continuation Antarctica. Initiation contemporaneous and, older than