Refinement of the tephrostratigraphy straddling the northern Patagonian Andes (40–41°S): new tephra markers, reconciling different archives and ascertaining the timing of piedmont deglaciation

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dc.catalogadorjca
dc.contributor.authorAlloway, Brent V.
dc.contributor.authorPearce, Nicholas J.G.
dc.contributor.authorMoreno, Patricio I.
dc.contributor.authorVillarrosa, Gustavo
dc.contributor.authorJara, Ignacio A.
dc.contributor.authorHenríquez, Carla A.
dc.contributor.authorSagredo T., Esteban
dc.contributor.authorRyan, Matthew T.
dc.contributor.authorOutes, Valeria
dc.date.accessioned2023-05-12T15:37:01Z
dc.date.available2023-05-12T15:37:01Z
dc.date.issued2022
dc.description.abstractWe describe the stratigraphy, age, geochemistry and correlation of tephra from west to east across the northern Patagonian Andes (c. 40–41°S) with a view to further refining the eruptive history of this region back to the onset of the Last Glacial Termination (~18 cal. ka). Eastwards across the Andes, rhyodacite to rhyolitic tephra markers of dominantly Puyehue-Cordón Caulle source are persistently recognised and provide a stratigraphic context for more numerously erupted intervening tephra of basalt to basaltic–andesite composition. Tephra from distal eruptive centres are also recognised. West of the Andean Cordillera, organic-rich cores from a small closed lake basin (Lago Pichilafquén) reveal an exceptional high-resolution record of lowland vegetation–climate change and eruptive activity spanning the last 15 400 years. Three new rhyodacite tephra (BT6-T1, -T2 and -T4) identified near the base of the Pichilafquén record, spanning 13.2 to 13.9 cal. ka bp, can be geochemically matched with correlatives in basal andic soil sequences closely overlying regolith and/or basement rock. The repetitiveness of this tephrostratigraphy across this Andean transect suggests near-synchronous tephra accretion and onset of up-building soil formation under more stable (revegetating) ground-surface conditions following rapid piedmont deglaciation on both sides of the Cordillera by at least ~14 cal. ka bp.
dc.fechaingreso.objetodigital2023-05-12
dc.fuente.origenORCID
dc.identifier.doi10.1002/jqs.3389
dc.identifier.eissn1099-1417
dc.identifier.issn0267-8179
dc.identifier.urihttps://doi.org/10.1002/jqs.3389
dc.identifier.urihttps://onlinelibrary.wiley.com/doi/full/10.1002/jqs.3389
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/66978
dc.information.autorucInstituto de Geografía;Alloway, Brent Victor;0000-0003-1830-5163;1091784
dc.information.autorucInstituto de Geografía;Sagredo T., Esteban;0000-0002-4494-5423;16924
dc.issue.numero3
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final477
dc.pagina.inicio441
dc.revistaJournal of Quaternary Science
dc.rightsacceso restringido
dc.subjectAndes
dc.subjectLast Glacial Termination
dc.subjectNorthwest Patagonia
dc.subjectTephra
dc.subjectVolcán Puyehue
dc.subject.ddc550
dc.subject.deweyCiencias de la tierraes_ES
dc.titleRefinement of the tephrostratigraphy straddling the northern Patagonian Andes (40–41°S): new tephra markers, reconciling different archives and ascertaining the timing of piedmont deglaciation
dc.typeartículo
dc.volumen37
sipa.codpersvinculados1091784
sipa.codpersvinculados16924
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