Tuesday, 4 December 2012
Photo: normal faults in the Betic Cordillera
This month catched my attention a beautiful outcrop depicted in the "Photograph of the month" article, provided by Fabrizio Agosta, from the University of Basilicata, Italy, and it display a recent trench dug for a highway in Granada, Spain, where Triassic basement (marbles) are in contact with beach deposits of Tortonian age (Upper Miocene). Those deposits are beautifully deformed during extension in the Betic Cordillera by several normal faults, forming a typical conjugate pattern alternating synthetic and antithetic faults.
I find two things very interesting: first, the strain concentration near the marble; second, that the cut is actually double, as there is a smaller slope near the foreground, adding an extra third dimension to the structure. Beautiful!
Take a look here. You can download a pdf and a high resolution version of the photo: http://dx.doi.org/10.1016/j.jsg.2012.09.006
I really would like to include a low quality version of the picture here in this article, but even though the very short article is freely accessible, it would cost me just to embed the photo £18.57. Funny non-open access world!