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Petrology and chemistry of precambrian alkaline rhyolites from Western Bahia (Brazil)

Petrologie und Chemie der präkambrischen Alkalirhyolithe von West-Bahia (Brasilien)

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Summary

The petrology and chemistry of alkaline rhyolites from Western Bahia State are investigated. Original mineralogy and bulk chemistry are modified by secondary processes (cataclastic metamorphism, hydrothermal leaching). The overall chemistry suggests a pattern consistent with derivation from material of near quartz-feldspar cotectic composition. This may represent a pathway for crustal fractionation and for partial melting within the continental crust of material of potassium-rich granitic composition. Ancient basemental biotite-rich gneisses are considered to be the most probable starting material. Possible correlations of volcanism with the main tectonics of the area and of the whole Brazilian shield are discussed.

Zusammenfassung

Die Petrologie und die Chemie der Alkalirhyolithe aus dem Westen des Staates Bahia werden untersucht. Der ursprüngliche Mineralbestand und der Pauschalchemismus sind durch Sekundärprozesse (kataklastische Metamorphose, hydrothermale Auslaugung) verändert. Der Gesamtchemismus legt ein Modell nahe, das mit der Ableitung von Material nahe der Zusammensetzung des Quarz-Feldspat-Eutektikums in Übereinstimmung steht. Das kann einen Weg für Fraktionierung in der Kruste oder für partielle Aufschmelzung von Material der Zusammensetzung eines Kali-reichen Granites innerhalb der Kruste darstellen. Biotit-reiche Gneise des alten Untergrundes werden als wahrscheinlichstes Ausgangsmaterial angesehen. Mögliche Zusammenhänge des Vulkanismus mit der hauptsächlichen Tektonik des Gebietes und des ganzen Brasilianischen Schildes werden besprochen.

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Author notes

  1. M. L. Conceçao

    Present address: Instituto de Geociencias, Universidade Fed. da Bahia, Salvador, Bahia, Brazil

  2. G. P. Sighinolfi

    Present address: Istituto di Mineralogia, Università di Modena, I-41100, Modena, Italy

Authors and Affiliations

  1. Instituto de Geociencias, Universidade Fed. da Bahia, Salvador, Bahia, Brazil

    G. P. Sighinolfi &  Theodora

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  1. G. P. Sighinolfi
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Sighinolfi, G.P., Theodora & Conceçao, M.L. Petrology and chemistry of precambrian alkaline rhyolites from Western Bahia (Brazil). TMPM Tschermaks Petr. Mitt. 22, 218–235 (1975). https://doi.org/10.1007/BF01087841

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  • DOI: https://doi.org/10.1007/BF01087841

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