Just out | Strontium Distribution in Upper Devonian Conodont Elements: A Palaeobiological Proxy @ Rivista Italiana di Paleontologia e Stratigrafia


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Strontium Distribution in Upper Devonian Conodont Elements: A Palaeobiological Proxy


Author(s)

Andrey V. Zhuravlev, Sergey S. Shevchuk


Abstract:

Conodonts are an extinct group of marine animals possessing debated affinities. The conodont elements are composed of calcium phosphate [apatite (CaF)] and collagen-like proteins. Distribution of Sr in the bioapatite of albid, lamellar and paralamellar tissues of some Upper Devonian conodont element crowns from NW Russia was studied by microprobe. The calcium phosphate of the lamellar and paralamellar tissues demonstrates periodical oscillation of Sr contents across the lamellae (0.4-0.5 wt% in the outer part of lamella, and 0.2 wt% in the inner part). The albid tissue contains Sr of less than 0.4 wt%. It is suggested that oscillations of Sr concentrations reflect the periodic growth of the lamellae, and the average Ca/Sr ratio can be a proxy of the growth rate.
Keywords:
Conodonts; hard tissue growth; bioapatite; Sr variations

READ IT HERE:

http://riviste.unimi.it/index.php/RIPS/article/view/8311

Lurdes Fonseca

Assistant Professor and Researcher at University of Lisbon
Sociologist (PhD), Paleontologist (Researcher in Micropaleontology), Majors in Sociology and Biology, Minor in Geology. Main interests in Paleontology: Microfossils, Molecular fossils, Paleobiology and Paleoecology. (read more about me)
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