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 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 se

SUBMITTER: Marra F 

PROVIDER: S-EPMC5566960 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature