Open AccessThe Roman amphitheatre in Mérida, Spain ˗Augustan or Flavian? Radiocarbon dating results on mortar carbonate
Author(s) -
Alf Lindroos,
Jan Heinemeier,
Åsa Ringbom,
Thomas Schrøder Daugbjerg,
Irka Hajdas
Publication year - 2020
Publication title -
geochronometria
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.626
H-Index - 31
eISSN - 1897-1695
pISSN - 1733-8387
DOI - 10.2478/geochr-2020-0028
Subject(s) - carbonate , radiocarbon dating , mortar , phosphoric acid , lime , carbon dioxide , archaeology , geology , geochemistry , chemistry , history , paleontology , organic chemistry
Four lime mortar samples from the Mérida amphitheatre in Spain were dated in 2001 and re-dated in 2019 with refined dating methods and focus on carbon dioxide that was released in late CO 2 fractions when dissolved in phosphoric acid. The samples were difficult to date because they contained highly soluble, young carbonate contamination that dominated the carbon dioxide from the early stages of the reaction with the acid in the hydrolysis process. They were also rather hydraulic and rich in magnesium, which could have caused delayed hardening. However, there was very little dead carbon contamination so that late carbon dioxide fraction gave uniform 14 C ages, pointing to a late 1 st c. AD Flavian, or later age of the amphitheatre.