Tin granites,geochemical heritage,magmatic differentiation |
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Authors: | Dr B Lehmann |
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Institution: | (1) Present address: Institut für Angewandte Geologie, Freie Universität Berlin, Wichernstra\e 16, D-1000 Berlin 33 |
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Abstract: | Metallogenic provinces are not self-evident geochemical provinces. A scheme to quantify the processes of »geochemical heritage« and »magmatic differentiation« in the evolution of tin granites is presented. Geochemical heritage can be limited to a maximum contribution in the 5–10 ppm Sn range. The crucial process in the formation of tin granites is magmatic differentiation. A variable bulk Sn distribution coefficient controls the tin ore potential of granites.
Zusammenfassung Metallogenetische Provinzen stehen nicht zwangsläufig mit einer spekulativen regionalen geochemischen Spezialisierung im Zusammenhang. Am Beispiel der Zinngranite wird ein Schema zur Quantifizierung der beiden Komponenten »geochemische Vererbung« und »magmatische Differentiation« vorgestellt. Geochemische Vererbung kann dabei auf den Bereich von maximal 5–10 ppm Sn eingegrenzt werden. Entscheidender Prozess für die Bildung von Zinngraniten ist die magmatische Differentiation, wobei ein variabler Bulk-Zinn-Verteilungskoeffizient das mögliche Zinn-Potential bestimmt.
Résumé Les provinces métallogéniques ne correspondent pas nécessairement à des domaines à permanence géochimique. Prenant l'exemple des granites à étain, l'auteur présente un schéma qui quantifie les deux composants que sont »l'héritage géochimique« et la »différenciation magmatique«. L'héritage géochimique peut Être limité à une contribution maximale de 5 à 10 ppm Sn. Le processus décisif dans la formation des granites à étain est la différenciation magmatique, au cours de laquelle le coefficient de répartition de Sn est variable et détermine le potentiel-métal du granite.
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