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.
Users
Please
log in to take part in the discussion (add own reviews or comments).