40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13

Abstract We present four new 40Ar/39Ar ages of tephra layers from an aggradational succession (Valle Giulia Formation) near the mouth of the Tiber Valley in Rome that was deposited in response to sea-level rise during Marine Isotopic Stage (MIS) 13. These new ages, integrated with seven previously d...

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Autores principales:	Fabrizio Marra, Fabio Florindo, Brian R. Jicha
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/0192fdb60c25455c9cf42dcf11de8a4b
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spelling	oai:doaj.org-article:0192fdb60c25455c9cf42dcf11de8a4b2021-12-02T16:08:09Z40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 1310.1038/s41598-017-08614-62045-2322https://doaj.org/article/0192fdb60c25455c9cf42dcf11de8a4b2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08614-6https://doaj.org/toc/2045-2322Abstract We present four new 40Ar/39Ar ages of tephra layers from an aggradational succession (Valle Giulia Formation) near the mouth of the Tiber Valley in Rome that was deposited in response to sea-level rise during Marine Isotopic Stage (MIS) 13. These new ages, integrated with seven previously determined ages, provide the only extant independent, radioisotopic age constraint on glacial termination VI and on the duration of MIS 13 sea-level rise. The new geochronologic constraints suggest a long duration for the period of sea-level rise (533 ± 2 through 498 ± 2 ka) encompassing two consecutive positive peaks of the δ18O curve (substages 13.3 and 13.1). Consistently, the litho-stratigraphic features of the sedimentary record account for two aggradational phases separated by an intervening erosional phase. Moreover, the ages obtained for this study give us the opportunity to compare the timing of the sea-level fluctuations inferred from the stratigraphic record and that provided by the astrochronologic calibration of the Oxygen isotopic curves, and to assess the calibrations of 40Ar/39Ar standards. Results of this comparison indicate that the best match is for an age of 1.186 Ma for the Alder Creek Rhyolite sanidine and 28.201 Ma for the Fish Canyon Tuff sanidine.Fabrizio MarraFabio FlorindoBrian R. JichaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Fabrizio Marra Fabio Florindo Brian R. Jicha 40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
description	Abstract We present four new 40Ar/39Ar ages of tephra layers from an aggradational succession (Valle Giulia Formation) near the mouth of the Tiber Valley in Rome that was deposited in response to sea-level rise during Marine Isotopic Stage (MIS) 13. These new ages, integrated with seven previously determined ages, provide the only extant independent, radioisotopic age constraint on glacial termination VI and on the duration of MIS 13 sea-level rise. The new geochronologic constraints suggest a long duration for the period of sea-level rise (533 ± 2 through 498 ± 2 ka) encompassing two consecutive positive peaks of the δ18O curve (substages 13.3 and 13.1). Consistently, the litho-stratigraphic features of the sedimentary record account for two aggradational phases separated by an intervening erosional phase. Moreover, the ages obtained for this study give us the opportunity to compare the timing of the sea-level fluctuations inferred from the stratigraphic record and that provided by the astrochronologic calibration of the Oxygen isotopic curves, and to assess the calibrations of 40Ar/39Ar standards. Results of this comparison indicate that the best match is for an age of 1.186 Ma for the Alder Creek Rhyolite sanidine and 28.201 Ma for the Fish Canyon Tuff sanidine.
format	article
author	Fabrizio Marra Fabio Florindo Brian R. Jicha
author_facet	Fabrizio Marra Fabio Florindo Brian R. Jicha
author_sort	Fabrizio Marra
title	40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
title_short	40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
title_full	40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
title_fullStr	40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
title_full_unstemmed	40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13
title_sort	40ar/39ar dating of glacial termination vi: constraints on the duration of marine isotopic stage 13
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/0192fdb60c25455c9cf42dcf11de8a4b
work_keys_str_mv	AT fabriziomarra 40ar39ardatingofglacialterminationviconstraintsonthedurationofmarineisotopicstage13 AT fabioflorindo 40ar39ardatingofglacialterminationviconstraintsonthedurationofmarineisotopicstage13 AT brianrjicha 40ar39ardatingofglacialterminationviconstraintsonthedurationofmarineisotopicstage13
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40Ar/39Ar dating of Glacial Termination VI: constraints on the duration of Marine Isotopic Stage 13

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