کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9527070 1636983 2005 20 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plio-Quaternary extension in the Venezuelan Andes: Mapping from SAR JERS imagery
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Plio-Quaternary extension in the Venezuelan Andes: Mapping from SAR JERS imagery
چکیده انگلیسی
The geometry of extensional structures is described for the first time in the active setting of the Venezuelan Andes using remote sensing imagery. We favored the use of a mosaic of Synthetic Aperture Radar (SAR) scenes of the Japanese Earth Resources Satellite-1 (JERS-1) assisted by complementary remote sensing devices (Landsat TM, digital elevation models) and field observations to make a structural analysis at regional scale. Radar images are particularly efficient in the Venezuelan Andes where dense vegetation and frequent cloud covering earlier lent difficulties to remote sensing studies. We focused our analysis in the Valera-Rio Momboy and Bocono faults corner and in the Mucujun area. We show that, in an area where ongoing compression and strike-slip deformations occur, brittle extension can be detected independently from previous knowledge. Extensional structures correspond to elongated tilted blocks with dimension less than 10 km in width. Blocks are bounded by curved faults in plan view, the concavity being turned towards the axial part of the belt. The geometry and kinematics of such structures suggest that syn-orogenic extension started together with initiation of right-lateral strike-slip motion along the Bocono Fault in the Plio-Quaternary.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tectonophysics - Volume 399, Issues 1–4, 27 April 2005, Pages 293-312
نویسندگان
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