000148100 001__ 148100
000148100 005__ 20250114155432.0
000148100 0247_ $$2doi$$a10.1016/j.sedgeo.2021.106004
000148100 0248_ $$2sideral$$a125461
000148100 037__ $$aART-2021-125461
000148100 041__ $$aeng
000148100 100__ $$aDo Campo, Margarita
000148100 245__ $$aTerrestrial record of cyclic early Eocene warm-humid events in clay mineral assemblages from the Salta basin, northwestern Argentina
000148100 260__ $$c2021
000148100 5060_ $$aAccess copy available to the general public$$fUnrestricted
000148100 5203_ $$aThe Eocene continental sequence investigated in this study belongs to the Salta Group; it was deposited in an intracontinental rift, the Salta Basin (NW Argentina) that evolved from the Lower Cretaceous to middle Paleogene. The Salta Group contains the Mav¿z Gordo and Lumbrera Fms, spans the Paleocene-early Eocene, and shows excellent exposures in the region of the Valles Calchaquv¿es. This research is focused on the continental facies of the Lumbrera Fm, which correspond to the early Eocene. We studied the mineralogy of the fine-grained beds of the Lumbrera Fm in five locations (Valle Encantado, Tonco, Tin Tin, Luracatao, and Obelisco) by X-ray diffraction and scanning electron microscopy in order to examine the vertical variations in clay mineralogy and their relations with global paleoclimatic changes registered during the Eocene. The microtexture of the authigenic smectite-type clays (Sm to I/Sm R0) suggests that they mainly originated by crystallization from glassy volcanic materials. The high reactivity of the glass precludes the use of smectite-type-clay formation as an indicator of specific paleoclimatic conditions in the studied sediments. In contrast, the formation of kaolinite in sections with very low smectite proportions and a strong degree of weathering in crystalline silicates reflects intense weathering conditions and is a useful paleoclimatic proxy in terrestrial sediments. Significant variations in kaolinite/muscovite ratios at the base and in an intermediate bed in the Lumbrera Fm at Valle Encantado suggest the presence of cyclic hyperthermals through the Ypresian stage that may be tentatively correlated with the Eocene Thermal Maxima 2 and 3, which are the largest events that have been identified at a global scale in early Eocene marine sediments.
000148100 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000148100 590__ $$a3.329$$b2021
000148100 591__ $$aGEOLOGY$$b6 / 49 = 0.122$$c2021$$dQ1$$eT1
000148100 592__ $$a1.021$$b2021
000148100 593__ $$aStratigraphy$$c2021$$dQ1
000148100 593__ $$aGeology$$c2021$$dQ1
000148100 594__ $$a6.0$$b2021
000148100 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000148100 700__ $$0(orcid)0000-0002-4970-6333$$aBauluz, Blanca$$uUniversidad de Zaragoza
000148100 700__ $$aPapa del, Cecilia
000148100 700__ $$aPayrola, Patricio
000148100 700__ $$0(orcid)0000-0002-2169-4561$$aYuste, Alfonso$$uUniversidad de Zaragoza
000148100 700__ $$0(orcid)0000-0003-0410-6948$$aMayayo, Maria Jose$$uUniversidad de Zaragoza
000148100 7102_ $$12000$$2120$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Cristalografía Mineralog.
000148100 773__ $$g425 (2021), 106004 [16 pp]$$pSediment. geol.$$tSedimentary Geology$$x0037-0738
000148100 8564_ $$s1731134$$uhttps://zaguan.unizar.es/record/148100/files/texto_completo.pdf$$yPostprint
000148100 8564_ $$s937537$$uhttps://zaguan.unizar.es/record/148100/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000148100 909CO $$ooai:zaguan.unizar.es:148100$$particulos$$pdriver
000148100 951__ $$a2025-01-14-15:51:59
000148100 980__ $$aARTICLE