U/Pb radiochronology of two granitic plutons from the eastern Cordillera (Peru) — Extent of Permian magmatic activity and consequences |
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Authors: | J R Lancelot G Laubacher R Marocco U Renaud |
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Institution: | (1) Present address: Service de Géochronologie et de Geochimie Isotopique, Centre Géologique et Géophysique - U.S.T.L., Place E. Bataillon, 34060 Montpellier Cedex, France;(2) Present address: et Laboratoire de Géologie Structurale, U.S.T.L., Place E. Bataillon, O.R.S.T.O.M., 24 rue Bayard, Paris 8o, 34060 Montpellier Cedex, France |
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Abstract: | Two granitic bodies of the eastern Cordillera (Peru) have been dated by U/Pb method on zircons: 257±3 my and 238±11 my ages are respectively obtained for P 438 Quillabamba and P 381 Coasa granites. P 381 zircon fractions show a degree of discordancy which can be related to their quite high uranium contents (continuous lead loss model, with variable diffusion coefficient Wasserburg, 1963). Recent data and these new radiochronological results allow to define in the eastern Cordillera an extensive magmatic province of nearly 1000 km in length. This activity should be related to a distension phase. Consequently kinematic Hercynian and Andean intrusives are only present in minor proportion in Peruvian eastern Cordillera.
Zusammenfassung Zwei Granitkörper wurden in der östlichen Kordillere von Peru mit Hilfe der U/Pb-Methode an Zirkonen datiert. 257±3 mill. Jahre wurden für den P 438 Quillamba Granit und 238±11 mill. Jahre für den P 381 Coasa Granit ermittelt. Die P 381 Zirkon Werte zeigen eine Diskordanz, die auf einen erhöhten Urangehalt zurückgeführt werden kann (nach dem Modell für kontinuierlichen Bleiverlust mit variablem Diffusionskoeffizienten, Wasserburg 1963). Zusammen mit weiteren Datierungen kann man in der östlichen Kordillere eine magmatische Provinz von einer Länge bis zu 1000 km definieren. Diese Aktivität sollte im Zusammenhang mit einer Dehnungsphase stehen. Daraus folgt, daß herzynische und andin Intrusionen in der östlichen Kordillere von Peru nur von untergeordneter Bedeutung sind.
Resume Deux massifs de granite appartenant à un vaste cortège magmatique de la Cordillère orientale du Pérou ont été daté par la méthode U/Pb sur zircons; des âges de 257 ± 3 m.A. et de 238 ± 11 mA ont été ainsi déterminés respectivement pour les granites de Quillabamba (P 438) et de Coasa (P 381). Le notable degré de discordance des échantillons P 381 parait être dû à leurs relativement hautes teneurs en uranium (modèle de perte continue, à coefficient de diffusion variable de Wasserburg, 1963). Des travaux récents et ces nouvelles données radiochronologiques permettent de définir dans la Cordillère orientale du Pérou une province magmatique permienne d'environ 1000 km de long, dont la mise en place serait dûe à une phase de distension. Les instrusions hercyniennes et andines ne représentent qu'une proportion mineure des massifs granitoïdes de la Cordillère orientale.
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![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![mcy](/content/v015w0r141681p20/xxlarge1084.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![fcy](/content/v015w0r141681p20/xxlarge1092.gif) ![ucy](/content/v015w0r141681p20/xxlarge1091.gif) ![zcy](/content/v015w0r141681p20/xxlarge1079.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) , Wasserburg, 1963). ![pcy](/content/v015w0r141681p20/xxlarge1087.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![mcy](/content/v015w0r141681p20/xxlarge1084.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![shchcy](/content/v015w0r141681p20/xxlarge1097.gif) ![softcy](/content/v015w0r141681p20/xxlarge1100.gif) ![ecy](/content/v015w0r141681p20/xxlarge1101.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![ucy](/content/v015w0r141681p20/xxlarge1091.gif) ![gcy](/content/v015w0r141681p20/xxlarge1075.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ycy](/content/v015w0r141681p20/xxlarge1099.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![mcy](/content/v015w0r141681p20/xxlarge1084.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![gcy](/content/v015w0r141681p20/xxlarge1075.gif) ![mcy](/content/v015w0r141681p20/xxlarge1084.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![chcy](/content/v015w0r141681p20/xxlarge1095.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![pcy](/content/v015w0r141681p20/xxlarge1087.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![vcy](/content/v015w0r141681p20/xxlarge1074.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![tscy](/content/v015w0r141681p20/xxlarge1094.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![vcy](/content/v015w0r141681p20/xxlarge1074.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![chcy](/content/v015w0r141681p20/xxlarge1095.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ycy](/content/v015w0r141681p20/xxlarge1099.gif) ![Kcy](/content/v015w0r141681p20/xxlarge1050.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![softcy](/content/v015w0r141681p20/xxlarge1100.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![pcy](/content/v015w0r141681p20/xxlarge1087.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![yacy](/content/v015w0r141681p20/xxlarge1103.gif) 1000 ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) . ![Acy](/content/v015w0r141681p20/xxlarge1040.gif) ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![vcy](/content/v015w0r141681p20/xxlarge1074.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![zhcy](/content/v015w0r141681p20/xxlarge1078.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![khcy](/content/v015w0r141681p20/xxlarge1093.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![softcy](/content/v015w0r141681p20/xxlarge1100.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![zcy](/content/v015w0r141681p20/xxlarge1079.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![mcy](/content/v015w0r141681p20/xxlarge1084.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![fcy](/content/v015w0r141681p20/xxlarge1092.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![zcy](/content/v015w0r141681p20/xxlarge1079.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![yacy](/content/v015w0r141681p20/xxlarge1103.gif) ![zhcy](/content/v015w0r141681p20/xxlarge1078.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) . ![Ocy](/content/v015w0r141681p20/xxlarge1054.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![yucy](/content/v015w0r141681p20/xxlarge1102.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![ucy](/content/v015w0r141681p20/xxlarge1091.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) , ![chcy](/content/v015w0r141681p20/xxlarge1095.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![gcy](/content/v015w0r141681p20/xxlarge1075.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![tscy](/content/v015w0r141681p20/xxlarge1094.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![ucy](/content/v015w0r141681p20/xxlarge1091.gif) ![zcy](/content/v015w0r141681p20/xxlarge1079.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![gcy](/content/v015w0r141681p20/xxlarge1075.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![vcy](/content/v015w0r141681p20/xxlarge1074.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![chcy](/content/v015w0r141681p20/xxlarge1095.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ycy](/content/v015w0r141681p20/xxlarge1099.gif) ![Kcy](/content/v015w0r141681p20/xxlarge1050.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![dcy](/content/v015w0r141681p20/xxlarge1076.gif) ![icy](/content/v015w0r141681p20/xxlarge1080.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) ![softcy](/content/v015w0r141681p20/xxlarge1100.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![acy](/content/v015w0r141681p20/xxlarge1072.gif) ![Pcy](/content/v015w0r141681p20/xxlarge1055.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![softcy](/content/v015w0r141681p20/xxlarge1100.gif) ![kcy](/content/v015w0r141681p20/xxlarge1082.gif) ![vcy](/content/v015w0r141681p20/xxlarge1074.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![rcy](/content/v015w0r141681p20/xxlarge1088.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![scy](/content/v015w0r141681p20/xxlarge1089.gif) ![tcy](/content/v015w0r141681p20/xxlarge1090.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![pcy](/content/v015w0r141681p20/xxlarge1087.gif) ![iecy](/content/v015w0r141681p20/xxlarge1077.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ncy](/content/v015w0r141681p20/xxlarge1085.gif) ![ucy](/content/v015w0r141681p20/xxlarge1091.gif) ![ocy](/content/v015w0r141681p20/xxlarge1086.gif) ![lcy](/content/v015w0r141681p20/xxlarge1083.gif) .
Contribution C.G.G. no 222. |
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Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
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