An exhumation model of the south Peloponnesus, Greece |
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Authors: | T Doutsos I Koukouvelas G Poulimenos S Kokkalas P Xypolias K Skourlis |
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Institution: | (1) Department of Geology, University of Patras, GR-26500 Patras, Greece e-mail: tdoutsos@upatras.gr Tel.: +30-61-997843 Fax: +30-61-994485, GR |
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Abstract: | An exhumation model comprising forward and backward thrusting and late orogenic collapse is proposed in order to explain
the kinematics of the tectonic windows in the south Peloponnesus. The model is based on mapping, mesoscopic structural data
and strain analysis. Syn-compressional thickening took place throughout the Oligocene and Early Miocene which includes the
subduction of the Pindos Ocean at the western margin of the Pelagonian microcontinent and the intracontinental subduction
of the Phyllite–Quartzite and the Plattenkalk series. The latter subduction was associated with blueschist metamorphism, westward-directed
ductile thrusting, and folding. The exhumation history of the deeper parts of the orogen began at the Oligocene–Miocene boundary
with the progressive entrance of the low-density crust and the Plattenkalk carbonates in the subduction zone. Increased buoyancy
caused: (a) the initiation of the Phyllite–Quartzite series extrusion; (b) vertical coaxial stretching; and (c) the evolution
of two pop-up structures, i.e. the Parnon and Taygetos anticlines. This syn-compressional exhumation was taking place in the
lower Miocene with decreasing rates from 7 to 1.5 mm/year. The change in the local stress field from compression to extension
began in the middle Miocene with the formation of hinterland-dipping normal faults. The exhumation/denudation rate caused
by the footwall uplift along these faults does not exceed 0.2 mm/year.
Received: 16 April 1999 / Accepted: 19 January 2000 |
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Keywords: | Syncompressional uplift Synextensional uplift Tectonic windows Greece |
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