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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Depth to Curie temperature across the central Red Sea from magnetic data using the de-fractal method
Tectonophysics, Volume 624-625, Year 2014
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Description
The central Red Sea rift is considered to be an embryonic ocean. It is characterised by high heat flow, with more than 90% of the heat flow measurements exceeding the world mean and high values extending to the coasts - providing good prospects for geothermal energy resources. In this study, we aim to map the depth to the Curie isotherm (580. °C) in the central Red Sea based on magnetic data. A modified spectral analysis technique, the "de-fractal spectral depth method" is developed and used to estimate the top and bottom boundaries of the magnetised layer. We use a mathematical relationship between the observed power spectrum due to fractal magnetisation and an equivalent random magnetisation power spectrum. The de-fractal approach removes the effect of fractal magnetisation from the observed power spectrum and estimates the parameters of depth to top and depth to bottom of the magnetised layer using iterative forward modelling of the power spectrum. We applied the de-fractal approach to 12 windows of magnetic data along a profile across the central Red Sea from onshore Sudan to onshore Saudi Arabia. The results indicate variable magnetic bottom depths ranging from 8.4. km in the rift axis to about 18.9. km in the marginal areas. Comparison of these depths with published Moho depths, based on seismic refraction constrained 3D inversion of gravity data, showed that the magnetic bottom in the rift area corresponds closely to the Moho, whereas in the margins it is considerably shallower than the Moho. Forward modelling of heat flow data suggests that depth to the Curie isotherm in the centre of the rift is also close to the Moho depth. Thus Curie isotherm depths estimated from magnetic data may well be imaging the depth to the Curie temperature along the whole profile. Geotherms constrained by the interpreted Curie isotherm depths have subsequently been calculated at three points across the rift - indicating the variation in the likely temperature profile with depth. © 2014 Elsevier B.V.
Authors & Co-Authors
Salem, Ahmed S.K.
United Kingdom, Leeds
Getech Group
United Kingdom, Leeds
University of Leeds
Egypt, Cairo
Nuclear Materials Authority
Green, Chris M.
United Kingdom, Leeds
Getech Group
United Kingdom, Leeds
University of Leeds
Ravat, Dhananjay Tiku
United States, Lexington
University of Kentucky
Singh, Kumar Hemant
India, Mumbai
Indian Institute of Technology Bombay
East, Paul
United Kingdom, Leeds
Getech Group
Fairhead, James Derek
United Kingdom, Leeds
Getech Group
United Kingdom, Leeds
University of Leeds
Mogren, Saad M.
Saudi Arabia, Riyadh
King Saud University
Biegert, Ed
Netherlands, The Hague
Shell Global
Statistics
Citations: 87
Authors: 8
Affiliations: 7
Identifiers
Doi:
10.1016/j.tecto.2014.04.027
ISSN:
00401951
Study Locations
Sudan