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Tetradiidae — First evidence of aragonitic mineralogy in tabulate corals

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Kurzfassung

Tabulata zeigen bei schwacher Vergrößerung gut erhaltene Mikrostrukturen, lassen jedoch bei starker Vergrößerung unter dem Raster-Elektronenmikroskop verschiedene Stadien diagenetischer Öberprägung erkennen. Dieser Befund läßt auf ihre ursprüngliche Mg-kalzitische Zusammensetzung schließen. Im Gegensatz zu alien anderen untersuchten Gattungen der Tabulata sind die Skelette der Familie Tetradiidae vollständig durch neomorphen Spat ersetzt, was auf eine primäre aragonitische Zusammensetzung hinweist.

Abstract

Tabulate corals exhibit well preserved microstructures when observed at low magnifications, but reveal various degrees of diagenetic overprint when analyzed at high SEM magnifications. This evidence suggests an original Mg-calcitic mineralogy. In contrast to all other examined genera of the order, the skeletons of the family Tetradiidae are completely replaced by neomorphic spar, indicating an original aragonitic composition.

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  1. Institut und Museum für Geologie und Paläontologie der Universität, Sigwartstraße 10, D-7400, Tübingen

    Jobst Wendt

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  1. Jobst Wendt
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Wendt, J. Tetradiidae — First evidence of aragonitic mineralogy in tabulate corals. Paläont. Z. 63, 177–181 (1989). https://doi.org/10.1007/BF02989506

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