Geochemistry of acidic volcanic clasts in Silurian conglomerates of the Midland Valley of Scotland: Implications on the Caledonian orogeny |
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Authors: | Prof Dr Jörg Loeschke |
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Institution: | (1) Present address: Institut für Geologie und Paläontologie, Sigwartstraße 10, D-7400 Tübingen, Germany |
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Abstract: | 20 clasts of acidic volcanic rocks from Silurian conglomerates of the Midland Valley of Scotland are similar in their geochemical composition to rhyolithes, rhyodacites and dacites of recent island arcs and active continental margins. They differ from the geochemical composition of upper Ordovician peralkaline rhyolites of the Tweed Valley in the Southern Uplands (Scotland) because of their lower Zr, Nb, Ce and Y contents. It is argued that these volcanic clasts represent erosional remnants of an island arc or active continental margin which was situated in the Midland Valley during upper Ordovician or lower Silurian time. This has implications on palaeogeographic models which have been suggested for the Scottish Caledonides.
Zusammenfassung 20 Gerölle saurer Vulkanite aus silurischen Konglomeraten des Midland Valley in Schottland haben in ihrer geochemischen Zusammensetzung Ähnlichkeiten mit Rhyolithen, Rhyodaziten und Daziten von rezenten Inselbögen und aktiven Kontinentalrändern. Sie unterscheiden sich durch niedrigere Gehalte an Zr, Nb, Ce und Y von oberordovizischen Peralkali-Rhyolithen des Tweed Valley in den Southern Uplands (Schottland). Es wird vermutet, daß die analysierten Gerolle Erosionsreste eines Inselbogens oder aktiven Kontinentalrandes darstellen, der zur Zeit des oberen Ordoviziums oder unteren Silurs im Raum des Midland Valley gelegen hat. Es ergeben sich daraus Folgerungen für paläogeographische Modelle, die für die schottischen Kaledoniden entwickelt worden sind.
Résumé La présente note porte sur 20 galets de volcanites acides contenus dans des conglomérats siluriens du Midland Valley (Ecosse). Leurs compositions géochimiques sont analogues à celles de rhyolites, rhyo-dacites et dacites d'arcs insulaires et de marges continentales actives actuels. Leur faible teneur relative en Zr, Nb, Ce et Y les distinguent des rhyolites peralcalines d'âge ordovicien supérieur des Southern Uplands (Ecosse). Ces galets de volcanites sont interprétés comme des produits de l'érosion soit d'un arc insulaire, soit d'une marge active, situés à l'emplacement de l'actuelle Midland Valley au cours de l'Ordovicien supérieur ou du Silurien inférieur.Ceci entraîne certaines implications dans les modèles paléogéographiques qui ont été proposés pour les Calédonides d'Ecosse.
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![gcy](/content/p172232942314120/xxlarge1075.gif) ![mcy](/content/p172232942314120/xxlarge1084.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![gcy](/content/p172232942314120/xxlarge1075.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) , ![kcy](/content/p172232942314120/xxlarge1082.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![ycy](/content/p172232942314120/xxlarge1099.gif) ![pcy](/content/p172232942314120/xxlarge1087.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![khcy](/content/p172232942314120/xxlarge1093.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![gcy](/content/p172232942314120/xxlarge1075.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) , ![icy](/content/p172232942314120/xxlarge1080.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![zhcy](/content/p172232942314120/xxlarge1078.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![gcy](/content/p172232942314120/xxlarge1075.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![ucy](/content/p172232942314120/xxlarge1091.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![khcy](/content/p172232942314120/xxlarge1093.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) Midland Valley. ![Ncy](/content/p172232942314120/xxlarge1053.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![ecy](/content/p172232942314120/xxlarge1101.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![pcy](/content/p172232942314120/xxlarge1087.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![pcy](/content/p172232942314120/xxlarge1087.gif) ![ycy](/content/p172232942314120/xxlarge1099.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![ucy](/content/p172232942314120/xxlarge1091.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![vcy](/content/p172232942314120/xxlarge1074.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![pcy](/content/p172232942314120/xxlarge1087.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![gcy](/content/p172232942314120/xxlarge1075.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![gcy](/content/p172232942314120/xxlarge1075.gif) ![rcy](/content/p172232942314120/xxlarge1088.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![fcy](/content/p172232942314120/xxlarge1092.gif) ![SHcy](/content/p172232942314120/xxlarge1064.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![tcy](/content/p172232942314120/xxlarge1090.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![scy](/content/p172232942314120/xxlarge1089.gif) ![kcy](/content/p172232942314120/xxlarge1082.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) ![Kcy](/content/p172232942314120/xxlarge1050.gif) ![acy](/content/p172232942314120/xxlarge1072.gif) ![lcy](/content/p172232942314120/xxlarge1083.gif) ![iecy](/content/p172232942314120/xxlarge1077.gif) ![dcy](/content/p172232942314120/xxlarge1076.gif) ![ocy](/content/p172232942314120/xxlarge1086.gif) ![ncy](/content/p172232942314120/xxlarge1085.gif) ![icy](/content/p172232942314120/xxlarge1080.gif) .
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