Alkaline character of Eocene volcanism in the middle part of central Iran and its geodynamic situation |
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Authors: | Sayed Mehdi Amidi Mohammad Hashem Emami Robert Michel |
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Institution: | (1) Present address: Geological Survey of Iran, P. O. Box 1964, Teheran, Iran;(2) Present address: Institut Dolomieu, Laboratoire de Minéralogie-Pétrographie, Université de Grenoble I, rue Maurice-Gignoux, 38 031 Grenoble, France |
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Abstract: | Alkaline volcanic rocks, sometimes feldspathoid bearing, appear in variable stratigraphic positions within the Eocene of the middle part of Central Iran. No magmatic zonation and no K2O enrichment in both time and space can be found in this volcanic sequence. These facts together with other geochemical and geological features of the Iranian Eocene provinces do not agree with a volcanism related to a subduction zone model.Reversely, a rift model may be applied for the interpretation of the origin of Eocene volcanic rocks and their geodynamic situation. The emissions of alkaline magma are linked with rhythmic opening of a rift zone during Eocene.A mutual contamination between a basaltic magma and a bulky palingenetic acid magma is responsible for the few volcanic rocks with calc-alkaline trend.
Zusammenfassung Alkali-Gesteine, die manchmal Feldspatoide enthalten, treten in verschiedenen stratigraphischen Stellungen innerhalb des Eozäns des Zentral-Irans auf.In diesen Vulkaniten ist keinerlei magmatische Zonierung und insbesondere keine systematische Variation der Kaligehalte festzustellen. Diese und andere geologische und geochemische Argumente sprechen gegen eine Deutung als Paläosubduktionszone.Als Alternative bietet sich das Modell der Öffnung eines Grabens an: der Alkali-Vulkanismus steht in Zusammenhang mit den verschiedenen Phasen der Entstehung und Entwicklung eines Rifts während des Eozäns.Die seltenen Vulkanite kalk-alkalischer Zusammensetzung erklären sich durch Mischung der Magmen von Alkali-Basalten mit den bedeutenden anatektischen Magmen.
Résumé Des roches alcalines, éventuellement à feldspathoïde, existent à des niveaux et dans des secteurs variés de la séquence volcanique éocène de la partie médiane de la zone de l'Iran Central; par ailleurs, dans cette série, on n'a pu mettre en évidence ni zonation magmatique, ni enrichissement en K2O. Ces faits, joints à d'autres caractères géochimiques et géologiques des provinces éocènes de l'Iran, sont en désaccord avec un volcanisme lié à une zone de subduction.En revanche, un modèle de rift peut être appliqué pour interpréter l'origine des volcanites éocènes et leur situation géodynamique. Les émissions de magma alcalin sont en effet en relation avec l'ouverture rhythmique d'une zone de rift pendant l'Eocène.Quant aux rares roches à tendance calco-alcaline, elles résultent d'une contamination mutuelle entre un magma basaltique et un important magma acide palingénétique.
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![iecy](/content/q28g012147666168/xxlarge1077.gif) ![vcy](/content/q28g012147666168/xxlarge1074.gif) -![shchcy](/content/q28g012147666168/xxlarge1097.gif) ![iecy](/content/q28g012147666168/xxlarge1077.gif) ![lcy](/content/q28g012147666168/xxlarge1083.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![chcy](/content/q28g012147666168/xxlarge1095.gif) ![ncy](/content/q28g012147666168/xxlarge1085.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![gcy](/content/q28g012147666168/xxlarge1075.gif) ![scy](/content/q28g012147666168/xxlarge1089.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![scy](/content/q28g012147666168/xxlarge1089.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![vcy](/content/q28g012147666168/xxlarge1074.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![bcy](/content/q28g012147666168/xxlarge1073.gif) ![rcy](/content/q28g012147666168/xxlarge1088.gif) 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![lcy](/content/q28g012147666168/xxlarge1083.gif) ![softcy](/content/q28g012147666168/xxlarge1100.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![scy](/content/q28g012147666168/xxlarge1089.gif) ![zcy](/content/q28g012147666168/xxlarge1079.gif) ![ncy](/content/q28g012147666168/xxlarge1085.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![chcy](/content/q28g012147666168/xxlarge1095.gif) ![icy](/content/q28g012147666168/xxlarge1080.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![iecy](/content/q28g012147666168/xxlarge1077.gif) ![lcy](/content/q28g012147666168/xxlarge1083.gif) ![softcy](/content/q28g012147666168/xxlarge1100.gif) ![ncy](/content/q28g012147666168/xxlarge1085.gif) ![ycy](/content/q28g012147666168/xxlarge1099.gif) ![mcy](/content/q28g012147666168/xxlarge1084.gif) ![kcy](/content/q28g012147666168/xxlarge1082.gif) ![ocy](/content/q28g012147666168/xxlarge1086.gif) ![lcy](/content/q28g012147666168/xxlarge1083.gif) ![icy](/content/q28g012147666168/xxlarge1080.gif) ![iecy](/content/q28g012147666168/xxlarge1077.gif) ![scy](/content/q28g012147666168/xxlarge1089.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![vcy](/content/q28g012147666168/xxlarge1074.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![mcy](/content/q28g012147666168/xxlarge1084.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![ncy](/content/q28g012147666168/xxlarge1085.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![iecy](/content/q28g012147666168/xxlarge1077.gif) ![kcy](/content/q28g012147666168/xxlarge1082.gif) ![tcy](/content/q28g012147666168/xxlarge1090.gif) ![icy](/content/q28g012147666168/xxlarge1080.gif) ![chcy](/content/q28g012147666168/xxlarge1095.gif) ![iecy](/content/q28g012147666168/xxlarge1077.gif) ![scy](/content/q28g012147666168/xxlarge1089.gif) ![kcy](/content/q28g012147666168/xxlarge1082.gif) ![icy](/content/q28g012147666168/xxlarge1080.gif) ![mcy](/content/q28g012147666168/xxlarge1084.gif) ![acy](/content/q28g012147666168/xxlarge1072.gif) ![gcy](/content/q28g012147666168/xxlarge1075.gif) .
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