000099651 001 __ 99651
000099651 005 __20140219120620.0
000099651 024 8_ $9 driver $9 artpubuab $a oai:ddd.uab.cat:99651
000099651 024 7_ $2 doi $a 10.1344/105.000001749
000099651 035 __ $9 articleid $a 16965728v10n3p265
000099651 041 __ $a eng
000099651 100 __ $a Giacosa, R. $u Servicio Geológico Minero Argentino (SEGEMAR)
000099651 245 1_ $a Structure of the Southern Patagonian Andes at 49ºS, Argentina
000099651 242 01 $a 
000099651 242 01 $a 
000099651 520 3_ $a This paper describes Late Paleozoic Gondwanan and Late Cretaceous to Early Cenozoic Andean structures in the Southern Patagonian Andes and an associated Extra-Andean region between lakes San Martín and Viedma. The study area encompasses a 200-km-long W-E section between the Patagonian icefield and the 72ºW longitude meridian, in Argentine Patagonia. The oldest structures are of Late Paleozoic age and developed through at least two deformation phases during the Gondwanan Orogeny. The first deformation phase (Dg1) includes isoclinal and N-overturned WNW trending folds and associated thrusts, including duplexes. The second deformation phase includes NNE trending open folds (Dg2). Deformation occurred in non-metamorphic to very low-grade metamorphic conditions. A spaced rough cleavage is found near the first phase fold hinges. The Eocene and Miocene Andean structural compression resulted in a N-S oriented fold and thrust belt. This belt is comprised of three morphostructural zones from W to E, with distinctive topographic altitudes and structural styles: Andean; Sub-Andean; and Extra-Andean zones. The first corresponds to the inner fold and thrust belt, while the last two are part of the outer fold and thrust belt. The Andean zone (3400–2000m above sea level) is characterized by N-S to NNE trending, E-vergent, Cenozoic reverse faults and associated minor thrusts. The northern part of the Sub- Andean zone (2000–1500m above sea level) consists of W-vergent reverse faults and some NNE open folds. The southern part of the Andean zone includes tight folds with box and kink geometries, related to thrusts at deeper levels. In the Extra-Andean zone, with maximum heights of 1500m, the deformation is less intense, and gentle folds deform the Upper Cretaceous sediments. An inherited Jurassic N-S extensional fault system imposed a strong control on this morphostructural zonation. Also the variation of the Austral Basin sedimentary thickness in the N-S direction seems to have influenced the structural styles of the outer fold and thrust belt. Those differences in sedimentary thickness may be related to S-dipping transfer zones associated to W-E Jurassic extension. In turn, the transfer zones may have been controlled by the N-vergent WNW, Dg1, Gondwanan structural fabric.
000099651 540 __ $a Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet l'ús comercial de l'obra i de les possibles obres derivades, la distribució de les quals s'ha de fer amb una llicència igual a la que regula l'obra original. $u http://creativecommons.org/licenses/by-sa/3.0/es/
000099651 546 __ $a Anglès
000099651 599 __ $a recerca
000099651 653 1_ $a Inversion structures
000099651 653 1_ $a Paleozoic Gondwanan structures
000099651 653 1_ $a Andean structures
000099651 653 1_ $a Fold and thrust belt
000099651 653 1_ $a Southern Patagonian Andes
000099651 655 _4 $a info:eu-repo/semantics/article
000099651 655 _4 $a info:eu-repo/semantics/publishedVersion
000099651 700 __ $a Fracchia, D. $u Comisión Nacional Energía Atómica (CNEA)
000099651 700 __ $a Heredia, N. $u Instituto Geológico y Minero de España (IGME)
000099651 710 1_ $a Universidad Nacional de la Patagonia. Departamento de Geología
000099651 773 __ $g Vol. 10, Núm. 3 (setembre 2012), p. 265-282 $t Geologica acta $x 1696-5728
000099651 856 40 $p 18 $s 6385990 $u http://ddd.uab.cat/pub/geoact/geoact_a2012m9v10n3/geoact_a2012m9v10n3p265.pdf
000099651 973 __ $f 0265 $l 282 $m setembre $n 3 $v 10 $x geoact_a2012m9v10n3 $y 2012
000099651 980 __ $a ARTPUB $b UAB $b GEOACT