The process of Near Eastern neolithization and its westward expansion from the core zone in the Levant and upper Mesopotamia has been broadly discussed in recent decades, and many models have been developed to describe the spread of early farming in terms of its timing, structure, geography and sociocultural impact. Until now, based on recent intensive investigations in northwestern and western...

Chaco Canyon in New Mexico was the center of an extensive regional cultural system. The strength Chaco's interactions has been partly defined by presence non–local goods including obsidian. We take a diachronic look at obsidian use from AD 500–1250 using largest sample XRF sourced available to date and combine this with technological analyses identify significant changes where how Chacoans obta...

Pozzolanes are mineral additives that have been widely used in concrete production recently. The main purposes of pozzolana to provide economy and improve various properties concrete. In this study, obsidian which located Pasinler District Erzurum Province has high amount reserves the world with silica content, zinc slag occurring during metal, metal industry mainly Turkey capacity world, pozzo...

This paper investigates the history of social interaction within communities in Vanuatu Archipelago and between other regions Western Pacific as reflected by variations lithic raw material sources technology stone artefacts. Past research determined an apparent contradiction long-distance transportation obsidian, indicating high value, under-utilisation at place discard, low value. The conclude...

The volatilization of fluorine from three melts in the system N a 2 0 A 1 2 0 3 S i O 2 has been investigated at 1 atm pressure and 1200-1400°C. The melts chosen have base compositions corresponding to albite, jadeite and a peraluminous melt with 75 mole % SiO 2. Melt spheres were suspended from platinum loops in a vertical tube furnace in a flow of oxygen gas, then quenched, sectioned and anal...

Analysis of minor or trace components of minerals has shown that the relative concentrations of these components often are uniquely characteristic of the source of the mineral, while those of the major components, e.g. silica or alumina, are not. In the case that there exist relatively few sources of the mineral but relatively many sites on which artifacts made from this mineral are found, such...