Browsing by Author "Faulkner, D."

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    Development of a self-similar strike-slip duplex system in the Atacama Fault system, Chile
    (PERGAMON-ELSEVIER SCIENCE LTD, 2011) Jensen, E.; Cembrano, J.; Faulkner, D.; Veloso, E.; Arancibia, G.
    Fault development models are crucial to predict geometry and distribution of fractures at all scales. We present here structures related to the development of the Bolfin Fault in the Atacama Fault System (AFS), covering a range of scales of 7 orders of magnitude. The AFS is a 1000 km-long trench-parallel fault system located in the Andean Forearc. The Boffin Fault is a first-order fault of the Caleta Coloso Duplex, has a trend similar to 170 degrees and length >45 km. It cuts mainly meta-diorites and exhibits a 100-200 m thick core of subvertical bands of altered fractured host rock and of foliated cataclasites. This foliation is made up of several trend-parallel cm-thick shear bands, composed of plagioclase fragments (>0.1 mm) surrounded by epidote.