CARACTERIZACIÓN MINERALÓGICA DE UN IMPACTO METEORITICO EN LA LOCALIDAD DE CARANCAS -PUNO

• Autores: Cerón Loayza, María L., Bravo Cabrejos, Jorge A.
• Formato: artículo
• Fecha de Publicación: 2009
• Institución: Universidad Nacional Mayor de San Marcos
• Repositorio: Revistas - Universidad Nacional Mayor de San Marcos
• Lenguaje: español
• OAI Identifier: oai:ojs.csi.unmsm:article/8715
• Enlace del recurso: https://revistasinvestigacion.unmsm.edu.pe/index.php/fisica/article/view/8715
• Nivel de acceso: acceso abierto
• Materia: Espectroscopia Mössbauer; difractometría de rayos x; fluorescencia de rayos x; meteorito; Carancas.; X ray fluorescence; X ray diffractometry; transmission Mössbauer spectroscopy; meteorite

We report the results of the study of a meteorite that impacted an inhabited zone in the neighborhood of the town of Carancas, Puno Region, about 1,300 km south of Lima. The analysis carried out by X ray diffractometry, transmission Mössbauer spectroscopy (at room temperature and at 4,2 K), and by energy dispersive X ray fluorescence reveal the presence in the meteorite simple of magnetic sites assigned to the Fe-Ni and troilite (Fe,S) phases, and of 3 paramagnetic doublets, two of them assigned to Fe2+, one associated to olivine and the other to pyroxene, and the third one due to a site occupied by Fe3+, which can be associated to oxides in a superparamagnetic state and/or by an Fe hydroxide. The soil samples from the crater reveal a composition that consists mainly of quartz, albite and impactites such as coesite and stishovite (SiO2). The occurrence of these phases with a high content of SiO2 in the crater soils strengthens the hypothesis of their origin induced by impact; we observe also the presence of the Fe oxide hematite, of aluminum silicates such as illite and montmorillonite, and an unasigned phase of Fe3+. In general, the results obtained by these techniques complement each other rather well and allow the verification of the origin of the studied simples.