Naslov
Post-depositional alterations of terrestrial and marine finds of Roman ceramics from Crikvenica production centre (NE Adriatic, Croatia) – A contribution towards chemometric classification
(Post-depositional alterations of terrestrial and marine finds of Roman ceramics from Crikvenica production centre (NE Adriatic, Croatia) – A contribution towards chemometric classification)

Autori
Zubin Ferri, Tea ; Rončević, Sanda ; Lipovac Vrkljan, Goranka ; Konestra, Ana

Izvornik
Journal of cultural heritage (1296-2074) 43 (2019); 12-25

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
archaeological ceramics ; elemental composition ; post-depositional alterations ; SEM/EDS ; FTIR ; PCA

Sažetak
Different post-depositional conditions and after-recovery treatments may provoke pronounced physico-chemical alterations that can make archaeological ceramics’ classification and comparison difficult evenwhen its provenance is known. The present study describes the differences in the chemical compositionverified on sherds of Roman ceramics produced in Crikvenica (NE Adriatic, Croatia). Inductive coupledplasma mass spectrometry (ICP- MS), scanning electron microscopy with energy dispersive spectroscopy(SEM-EDS), as well as Fourier transform infrared spectroscopy (FT-IR) were applied to characterise thechemical composition and post-depositional alterations in ceramics recovered onshore and underwa-ter. Chemometrical treatment of ICP-MS results of elemental composition and FT-IR absorption bandswas performed using univariate and multivariate statistical tools. Principal component analysis (PCA)led to clear distinction of several clusters of examined samples, i.e. samples from the mainland, samplesfrom the sea bottom, and desalinated samples. All sherds that have undergone desalination representa distinct sub-group by means of changes in the ratio of accumulated chemical elements. It was estab-lished that accumulation of Ca, Mg and Na and formation of salts such as FeS, Mg6Al2CO3(OH)16·4(H2O), and CaCO3reflect post-depositional environments and post-recovery treatments in terms of desalina- tion and specific marine underwater conditions (oxic and anoxic). Our results outlined a pattern ofpost-depositional alterations that could be applied in upcoming classification studies. Roman ceram-ics produced in Crikvenica and excavated from the workshop possess attributes of a reference group, revealing that Ho, Ce, La, Lu, Tb, Gd, Eu and Sm are the elements least susceptible to post- depositionalalterations.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Arheologija

POVEZANOST RADA