000088283 001__ 88283
000088283 005__ 20230921135431.0
000088283 0247_ $$2doi$$a10.1029/2019PA003806
000088283 0248_ $$2sideral$$a116457
000088283 037__ $$aART-2019-116457
000088283 041__ $$aeng
000088283 100__ $$0(orcid)0000-0002-4329-7858$$aRivero-Cuesta, L.$$uUniversidad de Zaragoza
000088283 245__ $$aPaleoenvironmental Changes at ODP Site 702 (South Atlantic): Anatomy of the Middle Eocene Climatic Optimum
000088283 260__ $$c2019
000088283 5060_ $$aAccess copy available to the general public$$fUnrestricted
000088283 5203_ $$aThe Middle Eocene Climatic Optimum (MECO) was an unusual global warming event that interrupted the long-term Eocene cooling trend ca. 40 Ma. Here we present new high-resolution bulk and benthic isotope records from South Atlantic ODP Site 702 to characterize the MECO at a high latitude setting. The MECO event, including early and peak warming as well as recovery to background levels, had an estimated ~300 Kyr duration (~40.51 to ~40.21 Ma). Cross-plots (delta O-18 vs. delta C-13) suggest that the mechanisms driving coupled changes in O and C isotope values across the MECO were weaker or absent before the event. The paleoecological response has been evaluated by quantitative analysis of calcareous nannofossils and benthic foraminifera assemblages. We document a shift in the biogeographical distribution of warm and temperate calcareous nannoplankton taxa, which migrated toward higher latitudes due to increased temperatures during the MECO. Conversely, changes in the organic matter flux to the seafloor appear to have controlled benthic foraminifera dynamics at Site 702. Benthic phytodetritus exploiting taxa increased in abundance coinciding with a positive delta C-13 excursion, ~150 Kyr before the start of the delta O-18 negative excursion that marks the start of MECO warming. Our data suggest that paleoecological disturbance in the deep sea predates MECO delta O-18 excursion and that it was driven by changes in the type and/or amount of organic matter reaching the seafloor rather than by increased temperature.
000088283 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E33-17R$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2017-84693-R
000088283 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/
000088283 590__ $$a2.888$$b2019
000088283 591__ $$aOCEANOGRAPHY$$b16 / 66 = 0.242$$c2019$$dQ1$$eT1
000088283 591__ $$aPALEONTOLOGY$$b3 / 55 = 0.055$$c2019$$dQ1$$eT1
000088283 591__ $$aGEOSCIENCES, MULTIDISCIPLINARY$$b62 / 198 = 0.313$$c2019$$dQ2$$eT1
000088283 592__ $$a1.927$$b2019
000088283 593__ $$aAtmospheric Science$$c2019$$dQ1
000088283 593__ $$aPaleontology$$c2019$$dQ1
000088283 593__ $$aOceanography$$c2019$$dQ1
000088283 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000088283 700__ $$aWesterhold, T.
000088283 700__ $$aAgnini, C.
000088283 700__ $$aDallanave, E.
000088283 700__ $$aWilkens, R.H.
000088283 700__ $$0(orcid)0000-0002-8801-9544$$aAlegret, L.$$uUniversidad de Zaragoza
000088283 7102_ $$12000$$2655$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Paleontología
000088283 773__ $$g34, 12 (2019), 2047-2066$$pPaleoceanogr. paleoclimatol.$$tPaleoceanography and Paleoclimatology$$x2572-4525
000088283 8564_ $$s8753761$$uhttps://zaguan.unizar.es/record/88283/files/texto_completo.pdf$$yVersión publicada
000088283 8564_ $$s64890$$uhttps://zaguan.unizar.es/record/88283/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000088283 909CO $$ooai:zaguan.unizar.es:88283$$particulos$$pdriver
000088283 951__ $$a2023-09-21-13:30:17
000088283 980__ $$aARTICLE