000078318 001__ 78318
000078318 005__ 20240122154813.0
000078318 0247_ $$2doi$$a10.1016/j.sedgeo.2018.03.007
000078318 0248_ $$2sideral$$a105294
000078318 037__ $$aART-2018-105294
000078318 041__ $$aeng
000078318 100__ $$aDo Campo, M.
000078318 245__ $$aEvidence of cyclic climatic changes recorded in clay mineral assemblages from a continental Paleocene-Eocene sequence, northwestern Argentina
000078318 260__ $$c2018
000078318 5060_ $$aAccess copy available to the general public$$fUnrestricted
000078318 5203_ $$aThe continental Paleocene-Eocene sequence investigated in this study belongs to the Salta Group, deposited in an intracontinental rift, the Salta Basin (NW Argentina), that evolved from the lower Cretaceous to the middle Paleogene, and is subdivided into the Pirgua, the Balbuena and the Santa Barbara Subgroups. The Maíz Gordo Formation (200 m thick) is the middle unit of the Santa Bárbara Subgroup, deposited during late post-rift sedimentation. We studied the mineralogy of fine-grained horizons of this formation by X-ray diffraction and Scanning Electron Microscopy (SEM) in order to examine the connection between vertical changes in clay mineralogy in alluvial sediments and paleosols, and global paleoclimatic changes registered during the Paleogene. Paleosols vary from calcic vertisols in the lowermost levels, to inseptisols and gleysols in intermediate positions, to gleyed oxisols in the upper section, indicating increased chemical weathering through time. Clay mineral relative abundances vary with a general increase in kaolinite content from bottom to top. However, at one site there are significant variations in kaolinite/muscovite (Kln/Ms) that define five cycles of kaolinite abundance and Kln/Ms. that indicate cyclic patterns of paleoprecipitation and paleotemperature. These are interpreted as several short-lived hyperthermals during the Paleocene-early Eocene in the Southern Hemisphere, which correlate with well-established episodes of warmth documented from the Northern Hemisphere.
000078318 536__ $$9info:eu-repo/grantAgreement/ES/DGA/E45$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2011-30153-C02-01$$9info:eu-repo/grantAgreement/ES/MINECO/CGL2013-46169-C2-1-P
000078318 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000078318 590__ $$a3.244$$b2018
000078318 591__ $$aGEOLOGY$$b4 / 46 = 0.087$$c2018$$dQ1$$eT1
000078318 592__ $$a1.317$$b2018
000078318 593__ $$aStratigraphy$$c2018$$dQ1
000078318 593__ $$aGeology$$c2018$$dQ1
000078318 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000078318 700__ $$0(orcid)0000-0002-4970-6333$$aBauluz, B.$$uUniversidad de Zaragoza
000078318 700__ $$adel Papa, C.
000078318 700__ $$aWhite, T.
000078318 700__ $$0(orcid)0000-0002-2169-4561$$aYuste, A.$$uUniversidad de Zaragoza
000078318 700__ $$0(orcid)0000-0003-0410-6948$$aMayayo, M.J.$$uUniversidad de Zaragoza
000078318 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000078318 773__ $$g368 (2018), 44-57$$pSediment. geol.$$tSedimentary Geology$$x0037-0738
000078318 8564_ $$s1244492$$uhttps://zaguan.unizar.es/record/78318/files/texto_completo.pdf$$yPostprint
000078318 8564_ $$s53515$$uhttps://zaguan.unizar.es/record/78318/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000078318 909CO $$ooai:zaguan.unizar.es:78318$$particulos$$pdriver
000078318 951__ $$a2024-01-22-15:32:14
000078318 980__ $$aARTICLE