This work presents the results of the analysis done on obsidians samples that belong to three archeological collections at the Museum of Archeology and Anthropology of San Marcos University (MacNeish's collection, • dated toan age 8000- 3500 b. C.) and the I.N.C. Regional Museum at lea (Maymi and Casa Vieja collections, corresponding to the Middle Horizon period 800 a. D.). Additionaly, with the idea ofundertaking future work on the establishment of trade routes and provenience studies in Andean populations, sorne obsidian samples from volcanic sources near to the gathering points are studied. 57Fe Mossbauer spectroscopy (MS), X Ray Fluorescence, Proton Induced X- Ray Emission Spectroscopy (PIXE), Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) and Inductively Coupled Plasma-Mass Spectroscopy (ICP-MS) were used to analysis. MS study provides the cation ratio Fe2+/Fe3,...

Estudia un conjunto de utensilios de obsidianas arqueológicas peruanas procedentes de las secuencias de Ayacucho (Colección MacNeish) fechados a una edad 8000-3500 a.c. y de la Costa Sur del Perú (Sitios Maymi y Casa Vieja, Ica) correspondiente al periodo Horizonte Medio = 800 d.c., a través de la espectroscopia Mossbauer del 57Fe. Asimismo, con la idea de un trabajo futuro de establecimiento de rutas de intercambio y estudio de procedencias en agrupamientos humanos sentados en la Cordillera de los Andes, se estudian algunas muestras de obsidianas de fuentes volcánicas próximas a los puntos de recolección. Realiza una caracterización Mossbauer de un total 25 muestras de obsidianas, basados en la información proveniente del entorno local de átomos de Fe dentro de la estructura vidriosa de la obsidiana. Los resultados muestran una relación para la proporción Fe2+/Fe3+, así com...

We use the classical molecular dynamics method (MD) to obtain an atomistic description of the diffusion and the structure of liquid aluminum in a wide range of temperatures (900 K - 2600 K). These studies use two-body long range oscillatory potentials. The numeric resolution of the motion equations is carried out by means of the Verlet algorithm. The MD simulation has been performed on a system of 256 particles using that short range order remains up to high temperatures. The height and shape of peaks suffer significant changes with the temperature, which evidences the peculiarities of changes in the liquid structure. The correlation radius decreases from 0,9 nm to 0,4 nm in the range of temperatures studied. We found that the first coordination number changes approximately in the interval of 12 - 8..5. The results of the measurements of the selfdiffusion coefficient in aluminum, carried...