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New excavations at prehistoric site of Espidej (3th Millennium BC) in south east Iranian orogeny led to a magnificent opportunity for re-examining the metallurgical records about the archaeometallurgy of Cu-As alloy long south-eastern cultural zone of Iran. The triangle of Jiroft-Tepe Yahya-Shahdad and the metallic Bronze objects from these areas are amongst the most important remarks for considering the technology of producing of arsenic Bronze as the first human mane copper alloy (Lamberg-Karlovsky, 1972). This study will focus on the tracing of As-bearing minerals in some metals – mainly Bronzes – from this site in south central Iran during the third millennium BC with an essential emphasize on synchrotron application for characterizing the crystalline phase determination. However, subsidy investigation on the consideration of arsenic Bronzes from Espidej was to allocate of possible natural sources.
Synchrotron based micro X-ray diffraction (SR-μXRD) data of the sample demonstrates traces of arsenic-bearing minerals in the corrosion products indicative of types of ores used in alloying processes. This area is part of hydrothermal mineralization zone consisting of arsenopyrite (FeAsS), sinnerite (Cu6As4S9), bornite (Cu5FeS4) and algodonite (Cu6As). Noticeable arsenic-bearing phases within the metallic core of the sample were frequently characterized as sinnerite and algodonite.