Late Barremian–early Aptian dark facies of the Subbetic (Betic Cordillera, southern Spain): Calcareous nannofossil quantitative analyses, chemostratigraphy and palaeoceanographic reconstructions

Paleoenvironments and Geochemical Signals from the Late Barremian to the Middle Aptian in a Tethyan Marginal Basin, Northeast Spain: Implications for Carbon Sequestration in Restricted Basins

“…Paleoclimatic reconstruction based on the clay mineral distribution was not the focus of the clay mineral analysis in this work, but the distribution of the clay fraction in the El Pui section is consistent with temperate-warm/ humid conditions as proposed by Aguado et al (2013) despite the limited abundance of kaolinite whose deposition may have been controlled by the basin paleophysiography Black Sea where phytoplankton development is sustained during the whole year because surface waters are almost continuously enriched in nutrient from constant discharge of the Danube .…”

“…However, these indicators do not always concur because changes in biogenic carbonate dissolution rate and diagenetic processes can alter the proportion in which the biogenic carbonate is preserved in the sediment (e.g. Roth and Coulbourn, 1982;Aguado et al, 2013). Also, the OC content in sediments may depend on the respiration rate (oxygen availability) in the water column and the dynamic of microbial communities, as these organisms can follow different pathways for OM degradation regarding redox conditions (Valiela, 1984;Meyers, 1994).…”

“…The paleoenvironmental record provides a glance of similar effects on primary producers that benefited from significant nutrient supply associated with sustained terrigenous input (Erba, 1994;Aguado et al, 2013). Furthermore, the lower Cretaceous record provides evidence that in some fertile marginal basins of the Tethys Ocean enhanced productivity may have intensified both the export of carbonate and organic matter (OM) to the sediment (Koutsoukos et al, 1991a(Koutsoukos et al, , 1991bMutterlose and Böckel, 1998; Dinarés-Turell and García-Senz, 2000;.…”

“…These conditions recurred intermittently through the Lower Cretaceous (e.g., Föllmi 2012;Aguado et al 2013), and regional physiographic factors and/or zonal climatic forcing mechanisms led to sediments in restricted basins that may include short episodes of enhanced OC sequestration with irregularity in duration and intensity in part decoupled from the tempo of major global forcing factors (e.g., Arthur 1979; Kuss and Schlagintweit 1988;Aguado et al 1997;Masse 1998;Masse and Machhour 1998;Bersezio et al 2002;Raisossadat and Shokri 2011;Föllmi et al 2011;Leonide et al 2012;Hu et al 2012;Husinec et al 2012;Roban and Melinte-Dobrinescu 2012;Elkhazri et al 2013). …”

Regional palaeoenvironmental influence on organic matter sequestration and characteristics of carbon isotope segment C5 in a hemipelagic sequence, Organyà Basin, northeast Spain

“…The (Figure 11). It is anticipated that work in progress will help clarify, and probably disclose the negative shift in δ 13 C org in this section, for example, La Frontera (Aguado et al, 2014a(Aguado et al, , 2014b; Roter Sattel and Cismon sections (Menegatti et al, 1998;Figure 11). Recent biostratigraphic results from lower Aptian successions are in agreement that the occurrence of the index planktonic foraminifer, L. cabri parallels the stratigraphic interval that includes OAE 1a (Magniez-Janin et al, 1997;Aguado et al, 1999;Bellanca et al, 2002;Verga and Premoli Silva, 2002;Coccioni et al, 2006;Heldt et al, 2008;Moullade et al, 2015).…”