Isotope records (C-O-Sr) of late Pliensbachian-early Toarcian environmental perturbations in the westernmost Tethys (Majorca Island, Spain)

Show simple item record Rosales Franco, M. Idoia Barnolas Cortina, Antonio Goy Goy, Antonio Sevillano Matilla, Ana Armendáriz Dufur, Maider López García, Jose María 2021-04-12T09:31:24Z 2021-04-12T09:31:24Z 2018
dc.identifier.citation Palaeogeography, Palaeoclimatology, Palaeoecology, 497 (2018), p.168–185 es_ES
dc.identifier.issn 0031-0182
dc.description.abstract The late Pliensbachian–early Toarcian (Early Jurassic) was a time of major environmental changes that culminated with the Early Toarcian Oceanic Anoxic Event (T-OAE, ca. ~183 Ma). This period is marked by significant disturbances in the carbon cycle and rapid climatic changes. To improve the understanding of the expression of these events in westernmost Tethyan domains, this study provides new belemnite and bulk carbonate C and O stable isotope records of a ~5 Myr upper Pliensbachian to middle Toarcian marine succession of the Balearic Basin (Es Cosconar section, Majorca). Time resolution has been improved by combination of biostratigraphic (ammonoids and brachiopods) and geochronologic (87Sr/86Sr) methods. Seawater paleotemperatures derived from δ18O belemnite records reveal cooler paleotemperatures in the upper part of the Spinatum Zone. The uppermost Spinatum Zone is characterized by the onset of a warming event that crosses the Pliensbachian-Toarcian boundary, culminating with the warmer temperatures (up to ~10 °C of warming) for the Serpentinum Zone of the lower Toarcian. This warming event has been detected contemporaneously in many other European and Tethyan basins and is interpreted to represent generalized raised seawater temperatures linked to the T-OAE. Four significant δ13C events have been recorded in belemnite and bulk carbonate records. The first is a negative carbon isotope excursion (CIE) around the Pliensbachian-Toarcian boundary, which is best represented in the belemnite record. Soon after, the bulk‑carbonate record shows a positive shift in the lower Tenuicostatum Zone concomitant with a return to background values in the belemnite record, suggesting strong water stratification or decoupling probably related with export of neritic carbonate to the basin. The third is a negative CIE represented in bulk carbonate across the Tenuicostatum-Serpentinum zonal transition, which could be correlated with the negative excursion characterizing the onset of the T-OAE in other sections. The position of this excursion corresponds with a gap in the belemnite record. Finally, in the lower Toarcian, both the bulk carbonate and belemnite carbon isotope records show pronounced positive CIEs in the lower-middle part of the Serpentinum Zone. These CIEs testify the impact of the T-OAE in the Balearic basin. es_ES
dc.description.sponsorship Unidad de Tres Cantos, Instituto Geológico y Minero de España, España es_ES
dc.description.sponsorship Departamento de Paleontología, Universidad Complutense de Madrid, España es_ES
dc.description.sponsorship Unidad de Baleares, Instituto Geológico y Minero de España, España es_ES
dc.language.iso en es_ES
dc.publisher Elsevier es_ES
dc.relation Projecto IGCP 655 "Toarcian Oceanic Anoxic Event: Impact on marine carbon cycle and ecosystems" es_ES
dc.relation CGL2015-66604-R es_ES
dc.relation CGL2014-53548-P es_ES
dc.rights Acceso abierto es_ES
dc.subject stable isotopes es_ES
dc.subject strontium isotopes es_ES
dc.subject sea-level change es_ES
dc.subject hyperthermal event es_ES
dc.subject Early Jurassic es_ES
dc.subject Mallorca es_ES
dc.subject Tethys es_ES
dc.title Isotope records (C-O-Sr) of late Pliensbachian-early Toarcian environmental perturbations in the westernmost Tethys (Majorca Island, Spain) es_ES
dc.type Postprint es_ES
dc.relation.publisherversion es_ES
dc.description.funder Ministerio de Industria, Economía y Competitividad, España es_ES
dc.identifier.doi es_ES
dc.coverage.spatialStudy Mallorca (isla), España es_ES

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