000048106 001__ 48106
000048106 005__ 20210121114544.0
000048106 0247_ $$2doi$$a10.1016/j.palaeo.2014.10.011
000048106 0248_ $$2sideral$$a89296
000048106 037__ $$aART-2015-89296
000048106 041__ $$aeng
000048106 100__ $$aReolid, M.
000048106 245__ $$aPalaeoenvironmental turnover across the Cenomanian-Turonian transition in Oued Bahloul, Tunisia: Foraminifera and geochemical proxies
000048106 260__ $$c2015
000048106 5060_ $$aAccess copy available to the general public$$fUnrestricted
000048106 5203_ $$aThe integrated analysis of foraminiferal assemblages, geochemical proxies, and stable isotopes in the Oued Bahloul section (Tunisia) allowed us to reconstruct the environmental turnover across the Cenomanian–Turonian boundary. An increase in palaeoproductivity proxies (P/Ti, U/Al, Sr/Al) and in d13C values, and a decrease in foraminiferal diversity and d18O values mark the beginning of the Oceanic Anoxic Event 2 (OAE2) at the Rotalipora cushmani and Whiteinella archaeocretacea biozones boundary. Eutrophic conditions at the seafloor and in the water column are evidenced by high proportions of buliminids and the replacement of planktic oligotrophic specialist Rotalipora by eutrophic opportunist Hedbergella. The enrichment in organic matter and redox sensitive elements, together with the abundance of low-oxygen tolerant benthic foraminifera, indicate dysoxic conditions in the deep-water column and at the seafloor (higher Uaut than Moaut). Among planktic foraminifera, deep- and intermediate-dwellers disappear (Rotalipora and Globigerinelloides), and surface-dwellers proliferate (Hedbergella). The persistency of the poorly oxygenated conditions during the W. archaeocretacea Biozone locally produced euxinic conditions where MoEF and Moaut reach high values, diversity presents minimum values, and benthic foraminifera temporarily disappear. The maximum percentage of heterohelicids indicates a stratified water column with a well-developed oxygen minimum zone. Improved oxygen conditions returned in the upper part of the W. archaeocretacea Biozone and Helvetoglobotruncana helvetica Biozone, with a slow recovery of foraminiferal assemblages, decrease in eutrophic genera (Heterohelix) and increase in mesotrophic genera (Whiteinella). A gradual increase in d18O values suggests decreased temperatures in surface waters. The OAE2 has been attributed to global temperature changes and palaeoceanographic reorganization. The poor mixing of surface and deep waters and enhanced primary productivity related to global warming – associated with increasing continental weathering and nutrient runoff – may have favored the eutrophication of the ocean and the expansion of the oxygen minimum zone.
000048106 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E05$$9info:eu-repo/grantAgreement/ES/MICINN/RYC-2009-04316$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2011-229121$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2011-23077$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2012-33281
000048106 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000048106 590__ $$a2.525$$b2015
000048106 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b44 / 184 = 0.239$$c2015$$dQ1$$eT1
000048106 591__ $$aPALEONTOLOGY$$b4 / 54 = 0.074$$c2015$$dQ1$$eT1
000048106 591__ $$aGEOGRAPHY, PHYSICAL$$b16 / 49 = 0.327$$c2015$$dQ2$$eT1
000048106 592__ $$a1.471$$b2015
000048106 593__ $$aEarth-Surface Processes$$c2015$$dQ1
000048106 593__ $$aPaleontology$$c2015$$dQ1
000048106 593__ $$aOceanography$$c2015$$dQ1
000048106 593__ $$aEcology, Evolution, Behavior and Systematics$$c2015$$dQ1
000048106 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000048106 700__ $$aSánchez-Quiñónez, C.A.
000048106 700__ $$0(orcid)0000-0002-8801-9544$$aAlegret, L.$$uUniversidad de Zaragoza
000048106 700__ $$0(orcid)0000-0001-5660-1428$$aMolina, E.$$uUniversidad de Zaragoza
000048106 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología
000048106 773__ $$g417 (2015), 491-510$$pPalaeogeogr. palaeoclimatol. palaeoecol.$$tPalaeogeography, Palaeoclimatology, Palaeoecology$$x0031-0182
000048106 8564_ $$s905311$$uhttps://zaguan.unizar.es/record/48106/files/texto_completo.pdf$$yPostprint
000048106 8564_ $$s8683$$uhttps://zaguan.unizar.es/record/48106/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000048106 909CO $$ooai:zaguan.unizar.es:48106$$particulos$$pdriver
000048106 951__ $$a2021-01-21-11:18:18
000048106 980__ $$aARTICLE