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Origin of tourmaline and oxide minerals from the metamorphosed Rampura Agucha Zn-Pb-(Ag) deposit, Rajasthan, India

Dravit-reicher Turmalin und Oxide der metamorphen Zn-Pb-(Ag) Lagerstätte Rampura Agucha, Rajasthan, Indien

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Summary

The sediment-hosted exhalative Rampura Agucha Zn-Pb-(Ag) deposit in Rajasthan, India, contains a number of oxide minerals which have been formed as a result of high-grade metamorphism. Gahnite (Zn0.66–0.75Fe0.13–0.24Mg0.06–0.13Al1.98–2.01O4) is a common minor phase in the ores and formed from breakdown of sphalerite and Al-rich silicates. Pyrophanite-ilmenite solid solution (Fe0.42–0.68Mn0.32–0.58Ti0.99–1.01O3) is very rare and occurs, intergrown with rutile, as a result of unmixing of a Ti-Fe-Mn bearing precursor mineral.

Dravite-rich tourmaline with Fe/(Fe+Mg) ratios around 0.02 occurs at the hanging wall contact of the orebody with the paragneisses and is intergrown with the ore minerals. Tourmaline from the stratabound ores is distinguished from schorl-rich tourmaline of two pegmatite samples which show Fe/(Fe+Mg) ratios of 0.43 and 0.62, respectively. It is argued that dravite-rich tourmaline (or another B-rich precursor mineral) is of premetamorphic origin. This dravite-rich tourmaline recrystallized during high-grade metamorphism when the metamorphic fluid, represented by H2O-CO2±CH4-N2 inclusions, was trapped.

Amphiboles, muscovites and biotites from metamorphic rocks of the deposit display radiometric39Ar/40Ar cooling ages between 788 and 909 Ma.

Zusammenfassung

Die sedimentär-exhalative Zn-Pb-(Ag) Lagerstätte Rampura Agucha in Rajasthan, Indien, beinhaltet eine Reihe von Oxidmineralen, die infolge der hochgradigen Regional-metamorphose gebildet wurden. Gahnit (Zn0.66–0.75Fe0.13–0.24 Mg0.06–0.13Al1.98–2.01O4) ist eine häufig anzutreffende Phase, die sich aus Sphalerit und Al-reichen Silikatphasen gebildet hat. Pyrophanit-Ilmenit (Fe0.42–0.68Mn0.32–0.58 T0.99–1.01O3) ist sehr selten und bildet, aufgrund der Entmischung eines Ti-Fe-Mn hältigen Vorläuferminerals, Verwachsungen mit Rutil.

Dravit-reicher Turmalin mit einem Fe/(Fe+Mg) Verhältnis um 0.02 bildete sich gleichzeitig mit den Sulfidmineralen am Kontakt des Erzkörpers mit den hangenden Paragneisen der Lagerstätte. Dieser Turmalin unterscheidet sich klar von Schörlreichem Turmalin mit Fe/(Fe+Mg) Verhältnissen von 0.43 und 0.62 von zwei Pegmatiten. Die Herkunft dieses prämetamorphen Dravit-reichen Turmalins (oder dessen Vorgängerminerals) ist unklar. Dieser Turmalin rekristallisierte während der Metamorphose, wobei er das metamorphe H2O-CO2±CH4-N2-Fluid in Form von primären Einschlüssen einschloß.

Amphibol, Muskowit und Biotit wurden mittels39Ar/40Ar-Methode datiert und liefern radiometrische Abkühlungsalter zwischen 788 und 909 Ma.

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Authors and Affiliations

  1. Institute of Geosciences, University of Leoben, Austria

    W. Höller

  2. Hindustan Zinc Limited, Udaipur, India

    S. M. Gandhi

  3. Didier Werke AG, Forschungsinstitut Wiesbaden, Didierstrasse 27-31, D-65203, Wiesbaden, Germany

    W. Höller

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Höller, W., Gandhi, S.M. Origin of tourmaline and oxide minerals from the metamorphosed Rampura Agucha Zn-Pb-(Ag) deposit, Rajasthan, India. Mineralogy and Petrology 60, 99–119 (1997). https://doi.org/10.1007/BF01163137

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