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The volcanic aggregate of ancient Roman mortars from the Capitoline Hill: Petrographic criteria for identification of Rome's "pozzolans" and historical implications.(Report)

Marra, Fabrizio ; Danti, Alberto ; Gaeta, Mario

Journal of Volcanology and Geothermal Research, Dec 15, 2015, Vol.308, p.113 [Periódico revisado por pares]

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  • Título:
    The volcanic aggregate of ancient Roman mortars from the Capitoline Hill: Petrographic criteria for identification of Rome's "pozzolans" and historical implications.(Report)
  • Autor: Marra, Fabrizio ; Danti, Alberto ; Gaeta, Mario
  • Assuntos: Concretes – Analysis ; Volcanic Rocks – Analysis ; Archaeology – Analysis ; Ancient Roman Civilization – Analysis ; Petrography – Analysis
  • É parte de: Journal of Volcanology and Geothermal Research, Dec 15, 2015, Vol.308, p.113
  • Descrição: To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1016/j.jvolgeores.2015.10.007 Byline: Fabrizio Marra [fabrizio.marra@ingv.it] (a,*), Alberto Danti (b), Mario Gaeta (c) Keywords Roman pozzolan; Petrography of volcanic rocks; Trace-element discrimination diagrams; Ancient Roman mortars; Material provenance Highlights * Identification criteria of volcanic rocks used in ancient Roman concrete masonry * Distinctive petrographic features of Colli Albani pyroclastic-flow deposits * Glass and trace-element compositions of mortar volcanic aggregates * Temple of Capitoline Jupiter mortar and concrete composition * Historical use of volcanic aggregates in ancient Roman mortars and concretes Abstract We present a petrographic study of the pyroclastic-flow deposits used to produce mortar aggregates (Pozzolane Rosse, Pozzolane Nere, and Pozzolanelle), as well as dimension stones (Tufo del Palatino and Tufo Lionato) in ancient Roman times, in which we describe the characteristic textures and mineralogic assemblages of their juvenile fraction. This petrographic dataset is employed to compare and classify, through observation in thin section at the optical microscope, and complementary trace-element analyses, as well as EMP analyses on matrix glass on archaeological and bulk natural samples, the composition of the volcanic aggregate of 11 samples of ancient Roman mortars collected from several archaeological structures excavated on the Capitoline Hill. By means of the combined petrographic and geochemical identification criteria illustrated in this work, we recognize two main types of mortar aggregates characteristic of the Republican and Imperial ages, respectively, and a third type pertaining to the mediaeval epoch. Author Affiliation: (a) Istituto Nazionale di Geofisica e Vulcanologia, Roma, Italy (b) Sovrintendenza Capitolina ai Beni Culturali, Musei Capitolini, Italy (c) Dipartimento di Scienze della Terra, Sapienza-UniversitAaAaAeA di Rom Italy * Corresponding author. Article History: Received 26 June 2015; Accepted 7 October 2015
  • Idioma: Inglês

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