Stable Isotope Signatures of Middle Palaeozoic Ahermatypic Rugose Corals - Deciphering Secondary Alteration, Vital Fractionation Effects, and Palaeoecological Implications

PloS One
Michal JakubowiczZdzislaw Belka

Abstract

This study investigates stable isotope signatures of five species of Silurian and Devonian deep-water, ahermatypic rugose corals, providing new insights into isotopic fractionation effects exhibited by Palaeozoic rugosans, and possible role of diagenetic processes in modifying their original isotopic signals. To minimize the influence of intraskeletal cements on the observed signatures, the analysed specimens included unusual species either devoid of large intraskeletal open spaces ('button corals': Microcyclus, Palaeocyclus), or typified by particularly thick corallite walls (Calceola). The corals were collected at four localities in the Holy Cross Mountains (Poland), Mader Basin (Morocco) and on Gotland (Sweden), representing distinct diagenetic histories and different styles of diagenetic alteration. To evaluate the resistance of the corallites to diagenesis, we applied various microscopic and trace element preservation tests. Distinct differences between isotopic compositions of the least-altered and most-altered skeleton portions emphasise a critical role of material selection for geochemical studies of Palaeozoic corals. The least-altered parts of the specimens show marine or near-marine stable isotope signals and lack po...Continue Reading

References

Feb 4, 2006·Science·Martin KennedyDavid Mrofka
Oct 6, 2007·Science·Jaroslaw StolarskiMaciej Mazur
Jul 10, 2009·Nature·L Paul Knauth, Martin J Kennedy
Nov 1, 2011·BMC Evolutionary Biology·Jarosław StolarskiAnders Meibom
Dec 7, 2013·Proceedings. Biological Sciences·Mikolaj K Zapalski

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