The OCTek-Atlantic study has investigated the conjugate margins of the Atlantic between 65°S and 60°N, an area which includes the South, Equatorial and Central Atlantic.
The results will therefore be of interest to those exploring or evaluating the offshore basins of:
• South America, including all of offshore Brazil
• West Africa, from South Africa north to Morocco
• Atlantic southern Europe, Iberia & Biscay
• The eastern American/Canadian seaboard
The primary output from OCTek-Atlantic is a comprehensive suite of digital grids for the South-Equatorial-Central Atlantic 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 age 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, using recently-published stage-poles, from the present-day back to their palaeogeographic coordinates at the time of break-up.
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-Atlantic is based on analysis of data available in the public domain. OCTek gravity inversion is proven technology which has also delivered the OCTek-Indian Ocean, OCTek-Arctic/North Atlantic, OCTek-GoM, OCTek-Australasia 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.