Zusammenfassung
Paläozoische alkaline-peralkaline Sodagranite von Umberatana, Südaustralien, besitzen erhöhte Gehalte an MnO, P2O5, Nb, Ta, Be, F and B und zeigen Charakteristika von »A-Typ« Graniten. Erhöhte Gehalte an F und B erlaubte die Kristallisation von primärem Muskovit bei Drucken, die auf Grund der erniedrigten Solidus Temperaturen möglicherweise 1 Kbar betrugen. Diese Gas reichen Magmen schieden Albit und zwei Generationen von K-reichem Alkalifeldspat aus. Die hydrothermalen fluiden Phasen, die sich während der Kristallisation dieser Magmen bildeten, verursachten eine bedeutene Elementumverteilung und Rekristallisation in den Intrusionen und dem unmittelbaren Nebengestein.
Abstract
Palaeozoic alkaline to peralkaline sodic granites of the Umberatana area of South Australia have high MnO, P5O5, Nb, Ta, Be, F and B abundances as is typical of »A-type« or anorogenic granites. Abundant F and B in the magma permitted primary muscovite to crystallize at pressures that may have been as low as 1 Kbar because of the lowered solidus temperatures. These volatile-rich magmas precipitated both albite and two generations of K-rich alkali feldspar. The hydrothermal fluids released during crystallization of these magmas resulted in considerable element redistribution and recrystallization both in the plutons and the adjacent country rocks.
Résumé
Les granites sodiques alcalins à peralcalins paléozoïques de la région d'Umberatana (Australie méridionale) présentent des teneurs élevées en MnO, P2O5, Nb, Ta, Be, F et B, caractère typique des granites de type A, ou anorogéniques. La grande quantité de F et de B présente dans le magma a permis la cristallisation de muscovite primaire à une pression qui ne devait pas excéder 1 Kbar, en raison de l'abaissement de la température du solidus. Ces magmas, riches en matières volatiles, ont précipité de l'albite et deux générations de feldspath alcalin potassique. Les fluides hydrothermaux libérés au cours de la cristallisation ont permis une redistribution et une recristallisation importante des éléments à la fois dans les plutons et dans les roches encaissantes.
Краткое содержание
В палеозойских щелоч но-перщелочных натри евых гранитах из Амберете на (Южная Австралия) от мечают повышенное содержан ие MnO, P2O5, Nb, Та, Be, F и B, а также признаки, ра зрешающие относить их к гранитам типа «А». Повышенное содержан ие фтора и бора разрешае т кристаллизацию пер вичных мусковитов при давле ниях, которые, возможн о, в результате понижения солидуса т емператур, составляю т 1 кбар. Из этих богатых г азом магм выделяются альбит и два поколени я щелочного полевого шпата, богатого калие м. Гидротермальные жи дкие фазы, образующиеся во время кристаллизаци и этих магм, вызывают значит ельное перераспреде ление элементов и перекрис таллизацию, как в интр узиях, так и во вмещающих пор одах.
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Teale, G.S., Lottermoser, B.G. Palaeozoic granites of the Umberatana region, South Australia: the role of volatiles in the crystallization of some alkaline-peralkaline granites. Geol Rundsch 76, 857–868 (1987). https://doi.org/10.1007/BF01821069
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DOI: https://doi.org/10.1007/BF01821069