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Artículo

Chemometric study of the preservation modes of Athabaskia anax (Trilobita, Cambrian Precordillera, Mendoza, Argentina): Implications for taxonomy

D`angelo, José AlejandroIcon ; Bordonaro, Osvaldo LuisIcon ; Raviolo López, Mariana MercedesIcon ; Bruno, Natalia EdithIcon ; Camí, Gerardo Enrique
Fecha de publicación: 08/2021
Editorial: Elsevier
Revista: Journal of South American Earth Sciences
ISSN: 0895-9811
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Paleontología

Resumen

Selected pygidia of the middle Cambrian corynexochid trilobite Athabaskia anax (Walcott 1916) from the Miaolingian Series of San Isidro (Precordillera, Mendoza, Argentina) are analyzed for the first time using scanning electron microscopy in combination with energy-dispersive X-ray spectrometry (SEM-EDX). Pygidia occur in a single stratigraphic level composed of fine-grained calcareous sandstones and show four types of morphological preservations. The purpose this case study is threefold: (1) to analyze in detail the sample types by means of SEM-EDX in order to explore the chemical changes of the exoskeleton induced by diagenesis; (2) to use principal component analysis (PCA) to focus on groupings as a function of the chemical composition; and (3) to analyze the possible systematic implications of the chemical data. Results show that PCA supports the distinction among the four types of morphological preservations, based mainly on differences in the contents of Ca, Al, and K, as well as Si and Mg. This suggests that diagenesis followed distinct taphonomic pathways in the single stratigraphic level and resulted in contrasting chemical compositions of the four types of morphological preservations. It is interpreted that some morphological characteristics of the pygidia are the result of chemical and structural changes taking place during fossilization and do not represent real morphological differences in the living organisms. Our results dictate caution when using some morphological characteristics of the exoskeletons to erect new taxa, which, in turn, could be used to draw erroneous conclusions on their biostratigraphy, biogeography, and palaeoecology.
Palabras clave: CHEMOMETRICS , CORYNEXOCHIDA , DIAGENESIS , PYGIDIUM , TAPHONOMY , TAXONOMY
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/171497
URL: https://www.sciencedirect.com/science/article/pii/S0895981121000791
DOI: http://dx.doi.org/10.1016/j.jsames.2021.103232
Colecciones
Articulos(IANIGLA)
Articulos de INST. ARG. DE NIVOLOGIA, GLACIOLOGIA Y CS. AMBIENT
Citación
D`angelo, José Alejandro; Bordonaro, Osvaldo Luis; Raviolo López, Mariana Mercedes; Bruno, Natalia Edith; Camí, Gerardo Enrique; Chemometric study of the preservation modes of Athabaskia anax (Trilobita, Cambrian Precordillera, Mendoza, Argentina): Implications for taxonomy; Elsevier; Journal of South American Earth Sciences; 109; 8-2021; 1-16
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