ARCHAEOMETRIC ANALYSIS OF WALL COATINGS FROM THE CHALCOLITHIC SITE OF SU CODDU (SARDINIA, ITALY)

Abstract

This paper addresses the archaeometric analysis of several wall coatings applied to diverse architectural

structures (wells, silos and domestic spaces) from the Chalcolithic site of Su Coddu/Canelles (Sardinia, Italy;

1. 3400-2850 BC). The study of the samples was carried out by means of optical microscopy by thin-section

analysis, micro X-Ray Diffraction and Scanning Electron Microscopy combined with Energy Dispersive X

Ray Spectroscopy. The study showed the application of successive layers of different thickness and granu

lometry to isolate the architectural structures. On the one hand, up to two layers made with a Tertiary fossil

iferous marly clay as plaster are documented. On the other hand, the application of a very thin final layer

very rich in calcite is observed in the majority of the samples studied. The analyses conducted evidence cer

tain variability in the technological choices made by the craftpeople. However, it is also observed a clear

adaptation of the properties of the studied materials to the insulating and waterproofing function that they

played in such architectural structures.