127690 20241125101157.0 doi 10.1016/j.cretres.2023.105632 sideral 134829 ART-2023-134829 eng Coimbra, Rute Evaluating and comparing geochemical sampling protocols in dinosaur eggshells: refining Cretaceous ecosystem research 2023 Access copy available to the general public Unrestricted The geochemical signatures of dinosaur eggshells represent well-established proxies in paleoenvironmental and paleobiological research. The variable sampling procedures reported in the literature, however, deserve attention. In order to evaluate the impact of different sampling methodologies on carbon and oxygen isotope and elemental concentrations, grinding was contrasted with drilling to extract powder samples from eggshell fragments collected at several locations. Eggshell data were further contrasted with surface materials, encasing matrix and compared with independent proxies using petrographic and elemental techniques. Iron and manganese elemental concentrations revealed an enrichment sequence depending on the sampling strategy for the same eggshell fragment. This pattern can be mistaken for a variable state of preservation. In contrast, carbon and oxygen isotope values exhibited only subtle differences and lacked clear trends. This suggests that isotope data are less susceptible to different methodological approaches. It is shown that drilling offers a wider range of possibilities compared to grinding (e.g., faster and less destructive). Additionally, drilled powder samples can confidently be used for elemental and isotope analysis, excluding contamination, thus providing a more accurate set of proxy data from eggshell archives. info:eu-repo/grantAgreement/ES/DGA-FEDER/E18 Aragosaurus-Recursos Geológicos y Paleoambientes info:eu-repo/grantAgreement/ES/MICINN/FJCI-2020-044561-I info:eu-repo/grantAgreement/ES/MICINN/PLEC2021-008203/AEI/10.13039/501100011033 info:eu-repo/grantAgreement/ES/MICINN/RYC2021-034473-I info:eu-repo/grantAgreement/ES/NextGenerationEU/PRTR info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 1.9 2023 PALEONTOLOGY 12 / 57 = 0.211 2023 Q1 T1 GEOLOGY 11 / 61 = 0.18 2023 Q1 T1 0.734 2023 Paleontology 2023 Q1 4.1 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Moreno-Azanza, Miguel Universidad de Zaragoza (orcid)0000-0002-7210-1033 Ezquerro, Lope Universidad de Zaragoza (orcid)0000-0003-0900-1440 Núñez-Lahuerta, Carmen (orcid)0000-0002-2882-6061 Gasca, José Manuel (orcid)0000-0002-8427-6199 Immenhauser, Adrián Mateus, Octávio Rocha, Fernando 2000 655 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Paleontología 151 (2023), 105632 [10 pp.] Cretac. res. Cretaceous Research 0195-6671 2869510 http://zaguan.unizar.es/record/127690/files/texto_completo.pdf Versión publicada 2636841 http://zaguan.unizar.es/record/127690/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:127690 articulos driver 2024-11-22-12:09:48 ARTICLE