The andes of northwestern Argentina |
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Authors: | Dr Juan Carlos M Turner |
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Institution: | (1) Present address: Dirección Nacional de Geología y Minería, Avda. Julio A. Roca 651, Piso 10, Buenos Aires, Argentina |
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Abstract: | This paper is a synthesis of the geological information available at present. The area studied comprises the Andes of Salta and Jujuy and the Puna; these geographical regions approximately correspond to the geological provinces of the Cordillera Oriental and the Puna.The geologic column comprises Precambrian metamorphics and intrusives, marine Lower Paleozoic, continental Upper Paleozoic, Cretaceous, and Upper Cenozoic. In the Puna, the Upper Cenozoic is characterized by extensive volcanism with dacitic and andesitic flows and tuffs, and with final basalt flows.Numerous unconformities have been recognized. In the Cordillera Oriental and in the basin range of the Puna, folds and faults occur, the latter are mainly high-angle reverse faults, dipping west in the eastern and east in the western portion of the area studied. The Cordillera Oriental, which is a shear zone at the eastern border of the Puna, is slightly younger than the Puna.
Zusammenfassung Die vorliegende Arbeit stellt eine Zusammenfassung der augenblicklich vorhandenen geologischen Kenntnisse dar.Die Anden von Salta und Jujuy einerseits und die Puna andererseits sind die beiden geographischen Gebiete, mit denen sich die Untersuchungen befassen und die ungefähr mit den geologischen Provinzen der Ostkordillere und der Puna zusammenfallen.Die geologische Folge umfaßt metamorphe Gesteine und Intrusiva des Präkambriums, marine Sedimente des Alt-Paläozoikums, kontinentale Sedimente des Jung-Paläozoikums, der Kreide und des jüngeren Känozoikums, das letztere mit einem ausgedehnten vulkanischen Zyklus, aus dem dacitische und andesitische Laven und Tuffe hervorgingen, die mit basaltischen Ergüssen abschlossen.Es wurden zahlreiche Diskordanzen angetroffen. In der Ost-Kordillere und in den Gebirgsblöcken ( basin range ) der Puna besteht die Struktur aus Faltung und Klüftung. Die Mehrzahl der Klüfte sind inverse Störungen mit großer Sprunghöhe, die im östlichen Gebiet nach Westen und im westlichen nach Osten einfallen. Die Ost-Kordillere, die Scherzone am östlichen Rand der Puna, ist etwas jünger als letztere.
Resumen El trabajo es una síntesis de la información geológica disponible en la actualidad. Los Andes de Salta y Jujuy y la Puna son las dos regiones geográficas que abarca la comarca en estudio, que corresponden aproximadamente a las provincias geológicas Cordillera Oriental y Puna.La columna geológica comprende metamorfitas y rocas intrusivas del Precámbrico, sedimentos marinos del Paleozoico inferior, sedimentos continentales del Paleozoico superior, Cretácico y Cenozoico superior. En esté último hubo un amplio ciclo volcánico, que originó coladas y tobas dacíticas y andesíticas y, finalmente, coladas basálticas.Se han reconocido varias discordancias. La estructura es de plegamiento y fallamiento en la Cordillera Oriental y de montañas de bloque en la Puna. En su mayoría, las fracturas son fallas inversas de alto-ángulo, que inclinan hacia el oeste en el tramo oriental y hacia el este en el tramo occidental. La Cordillera Oriental, zona de cizalla en el borde oriental de la Puna, es algo más joven que ésta.
Résumé La présente contribution est une synthèse de toute l'information géologique disponible actuellement. Les régions étudíées sont, au point de vue géographique, les Andes de Salta et Jujuy et la Puna qui correspondent approximativement aux provinces géologiques de la Cordillera Oriental et de la Puna.Le Précambrien est représenté par des roches métamorphiques et intrusives. Au Paléozoïque inferieur correspondent des sédiments marins, tandis que des sédiments continentaux sont datés du Paléozoïque supérieur, du Crétacé et du Cénozoïque supérieur. Un important cycle volcanique est représenté par coulées et tufs dacitiques et andésitiques, couronnées par des coulées basaltiques.Plusieurs discordances ont été reconnues. La Cordillera Oriental et les montagne de la Puna présentent une structure de plissement et fracturation. La plupart des fractures sont inverses à fort pendange vers l'ouest du côté oriental et vers l'est du côté occidental. La Cordillera Oriental, la zone de cisaillement au bord oriental de la Puna, est plus jeune que celle-ci.
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![tscy](/content/720lh713424rm114/xxlarge1094.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![zcy](/content/720lh713424rm114/xxlarge1079.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) . ![dcy](/content/720lh713424rm114/xxlarge1076.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![jcy](/content/720lh713424rm114/xxlarge1081.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![tscy](/content/720lh713424rm114/xxlarge1094.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![yacy](/content/720lh713424rm114/xxlarge1103.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![gcy](/content/720lh713424rm114/xxlarge1075.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) . ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![chcy](/content/720lh713424rm114/xxlarge1095.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![khcy](/content/720lh713424rm114/xxlarge1093.gif) ![Kcy](/content/720lh713424rm114/xxlarge1050.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![dcy](/content/720lh713424rm114/xxlarge1076.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![softcy](/content/720lh713424rm114/xxlarge1100.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![jcy](/content/720lh713424rm114/xxlarge1081.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) Puna ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![gcy](/content/720lh713424rm114/xxlarge1075.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![bcy](/content/720lh713424rm114/xxlarge1073.gif) , ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![dcy](/content/720lh713424rm114/xxlarge1076.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![yacy](/content/720lh713424rm114/xxlarge1103.gif) ![yucy](/content/720lh713424rm114/xxlarge1102.gif) ![shchcy](/content/720lh713424rm114/xxlarge1097.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![bcy](/content/720lh713424rm114/xxlarge1073.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![kcy](/content/720lh713424rm114/xxlarge1082.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![chcy](/content/720lh713424rm114/xxlarge1095.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![kcy](/content/720lh713424rm114/xxlarge1082.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![kcy](/content/720lh713424rm114/xxlarge1082.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![dcy](/content/720lh713424rm114/xxlarge1076.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![tscy](/content/720lh713424rm114/xxlarge1094.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![shchcy](/content/720lh713424rm114/xxlarge1097.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) . ![Bcy](/content/720lh713424rm114/xxlarge1041.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ecy](/content/720lh713424rm114/xxlarge1101.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![shchcy](/content/720lh713424rm114/xxlarge1097.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![pcy](/content/720lh713424rm114/xxlarge1087.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![yacy](/content/720lh713424rm114/xxlarge1103.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![lcy](/content/720lh713424rm114/xxlarge1083.gif) ![yacy](/content/720lh713424rm114/xxlarge1103.gif) ![yucy](/content/720lh713424rm114/xxlarge1102.gif) ![gcy](/content/720lh713424rm114/xxlarge1075.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![bcy](/content/720lh713424rm114/xxlarge1073.gif) ![ycy](/content/720lh713424rm114/xxlarge1099.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![kcy](/content/720lh713424rm114/xxlarge1082.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![chcy](/content/720lh713424rm114/xxlarge1095.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![kcy](/content/720lh713424rm114/xxlarge1082.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ucy](/content/720lh713424rm114/xxlarge1091.gif) ![shcy](/content/720lh713424rm114/xxlarge1096.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) , ![pcy](/content/720lh713424rm114/xxlarge1087.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![rcy](/content/720lh713424rm114/xxlarge1088.gif) ![yucy](/content/720lh713424rm114/xxlarge1102.gif) ![shchcy](/content/720lh713424rm114/xxlarge1097.gif) ![icy](/content/720lh713424rm114/xxlarge1080.gif) ![iecy](/content/720lh713424rm114/xxlarge1077.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![chcy](/content/720lh713424rm114/xxlarge1095.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![chcy](/content/720lh713424rm114/xxlarge1095.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![zcy](/content/720lh713424rm114/xxlarge1079.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![pcy](/content/720lh713424rm114/xxlarge1087.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) , ![zcy](/content/720lh713424rm114/xxlarge1079.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![pcy](/content/720lh713424rm114/xxlarge1087.gif) ![acy](/content/720lh713424rm114/xxlarge1072.gif) ![dcy](/content/720lh713424rm114/xxlarge1076.gif) ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) — ![ncy](/content/720lh713424rm114/xxlarge1085.gif) ![vcy](/content/720lh713424rm114/xxlarge1074.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) ![scy](/content/720lh713424rm114/xxlarge1089.gif) ![tcy](/content/720lh713424rm114/xxlarge1090.gif) ![ocy](/content/720lh713424rm114/xxlarge1086.gif) .
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