The OCTek-Indian Ocean study has investigated the rifted margins, rift basins and micro-continents of the Indian Ocean, from its northern margin south to 35°S.
The results will therefore be of interest to those exploring or evaluating the offshore basins of:
• The east and west coasts of India, including the Bay of Bengal & Arabian Sea
• East Africa north to the Gulf of Aden
• Madagascar and the Mozambique Channel
• The Seychelles microcontinent & Mascarene Basin
The primary output from OCTek-Indian Ocean is a comprehensive suite of digital grids for the Indian Ocean which show:
1 Depth to Moho
2 Total crustal thickness
3 Residual continental-basement crustal thickness
4 Crust and lithosphere thinning/beta factor
5 The residual thermal gravity anomaly at the present-day
The results have been tuned to local breakup ages along the margins and to local crustal reference thickness. They also explore a range of plausible scenarios for the amount of volcanic addition during breakup. As well as presenting the grids in their present-day coordinate framework the crustal-thickness grids have been sequentially restored, from the present-day back to their palaeogeographic coordinates at the time of break-up, shedding new light in particular on the complex breakup of the East Africa – Madagascar – Seychelles – West India margins. The restorations also extend south to include the Antarctic margin.
The suite of digital grids is available for unrestricted use by purchasing companies and institutions and is supported by an atlas of maps, which documents the techniques and data used together with a map-plot from all of the supplied grids.
OCTek-Indian Ocean is based on analysis of data available in the public domain. OCTek gravity inversion is proven technology which has also delivered the OCTek-Atlantic, OCTek-Arctic/North Atlantic, OCTek-Australasia, OCTek-GoM and OCTek-Asia/Pacific studies together with confidential results on a proprietary basis from rifted margins worldwide.
A study applying the OCTek gravity inversion methodology to the conjugate South Australia – Antarctic margins has been made available for free public download by Geoscience Australia.