Shallow lithological structure across the Dead Sea Transform derived from geophysical experiments

Geochemistry, Geophysics, Geosystems
By: , and 

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Abstract

In the framework of the DEad SEa Rift Transect (DESERT) project a 150 km magnetotelluric profile consisting of 154 sites was carried out across the Dead Sea Transform. The resistivity model presented shows conductive structures in the western section of the study area terminating abruptly at the Arava Fault. For a more detailed analysis we performed a joint interpretation of the resistivity model with a P wave velocity model from a partially coincident seismic experiment. The technique used is a statistical correlation of resistivity and velocity values in parameter space. Regions of high probability of a coexisting pair of values for the two parameters are mapped back into the spatial domain, illustrating the geographical location of lithological classes. In this study, four regions of enhanced probability have been identified, and are remapped as four lithological classes. This technique confirms the Arava Fault marks the boundary of a highly conductive lithological class down to a depth of ∼3 km. That the fault acts as an impermeable barrier to fluid flow is unusual for large fault zone, which often exhibit a fault zone characterized by high conductivity and low seismic velocity. At greater depths it is possible to resolve the Precambrian basement into two classes characterized by vastly different resistivity values but similar seismic velocities. The boundary between these classes is approximately coincident with the Al Quweira Fault, with higher resistivities observed east of the fault. This is interpreted as evidence for the original deformation along the DST originally taking place at the Al Quweira Fault, before being shifted to the Arava Fault.

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Publication type Article
Publication Subtype Journal Article
Title Shallow lithological structure across the Dead Sea Transform derived from geophysical experiments
Series title Geochemistry, Geophysics, Geosystems
DOI 10.1029/2011GC003678
Volume 12
Issue 7
Year Published 2011
Language English
Publisher American Geophysical Union
Contributing office(s) Crustal Geophysics and Geochemistry Science Center
Description Q07019, 15 p.
Country Jordan, Israel
Other Geospatial Dead Sea
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