8 research outputs found
Diagenetic and Biological Overprints in Geochemical Signatures of the Gigantoproductus Tertiary Layer (Brachiopoda): Assessing the Paleoclimatic Interpretation
Variations in the geochemical signatures of fossil brachiopod shells may be due to diagenesis and/or biological processes (i.e., âvital effectsâ). It is critical to characterise them in order to identify reliable shell areas suitable for paleoclimate studies. This investigation contributes to an in-depth understanding of geochemical variations in Gigantoproductus sp. shells (SW Spain, Serpukhovian age), throwing light onto the Late Paleozoic Ice Age interpretation. Microstructural, crystallographic, cathodoluminescence and geochemical (minor and trace elements, ÎŽ18O, ÎŽ13C, and strontium isotopes) characterisations have been performed on the tertiary layer of the ventral valve, to assess the preservation state. Poorly preserved areas exhibit microstructural and geochemical changes such as recrystallisation, fracturing and higher Mn and Fe enrichment. Moreover, these areas have a higher dispersion of âžâ¶Sr, âžâ·Sr, ÎŽ18O and ÎŽ13C than well-preserved areas. Three structural regions have been identified in well-preserved areas of the ventral valve by differences in valve curvature and thickness, such as the umbonal and thick and thin regions. These regions have different proportions of Mg, S, Na, ÎŽ18O, and ÎŽ13C, which are interpreted as âvital effectsâ and probably related to growth-rate differences during shell growth. The Gigantoproductus tertiary layer seems the most suitable for paleoclimate studies, because it retains the original microstructure and geochemical composition
Geodivulgar: GeologĂa y Sociedad 2018
Depto. de GeodinĂĄmica, EstratigrafĂa y PaleontologĂaFac. de Ciencias GeolĂłgicasFALSEsubmitte
Geodivulgar: GeologĂa y Sociedad
Con el lema âGeologĂa para todosâ el proyecto Geodivulgar: GeologĂa y Sociedad apuesta por la divulgaciĂłn de la GeologĂa a todo tipo de pĂșblico, incidiendo en la importancia de realizar simultĂĄneamente una acciĂłn de integraciĂłn social entre estudiantes y profesores de centros universitarios, de enseñanza infantil, primaria, de educaciĂłn especial y un acercamiento con pĂșblico con diversidad funcional
Anexo de la tesis "PaleobiologĂa y geoquĂmica en gigantoprodĂșctidos (Brachiopoda) durante las primeras etapas de la glaciaciĂłn carbonĂfera en el Paleotethys occidental"
Fac. de Ciencias GeolĂłgicasTRUEunpu
GEODIVULGAR: GeologĂa y Sociedad
Depto. de GeodinĂĄmica, EstratigrafĂa y PaleontologĂaFac. de Ciencias GeolĂłgicasFALSEsubmitte
Geodivulgar: GeologĂa y Sociedad
Depto. de GeodinĂĄmica, EstratigrafĂa y PaleontologĂaDepto. de QuĂmica InorgĂĄnicaDepto. de DidĂĄctica de las Ciencias Experimentales , Sociales y MatemĂĄticasFac. de Ciencias GeolĂłgicasFac. de Ciencias QuĂmicasFac. de EducaciĂłnFALSEsubmitte
Geodivulgar: GeologĂa y Sociedad
Memoria final del Proyecto Innova Docencia 2023-23 nÂș 58. GEODIVULGAR: GeologĂa y SociedadUCMDepto. de GeodinĂĄmica, EstratigrafĂa y PaleontologĂaFac. de Ciencias GeolĂłgicasFALSEsubmitte