Mapeamento geológico, caracterização litoquímica e potencial econômico do corpo de cromitito de Cedrolina, Santa Terezinha de Goiás - GO

Studies of mafic-ultramafic bodies have been carried out through the years due to their great use on the interpretation of geochemical and geotectonic processes that took place in Earth's history. Amongst them, chromitites are notably recognized for being excellent indicators of their parental magma chemistry and of different geotectonic environments, as well for frequently containing associated noble metals mineralization. Thus the investigation of one of this ultramafic bodies that occurs inside the Pilar de Goiás Greenstone Belt was proposed, resulting in a detailed map of the chromitites and country rocks, as well as innumerous new data on the chemistry of chromite and associated matrix and accessory minerals. These studies were based upon geological field observations, optic and Scanning Electron Microscope (SEM), besides electron microprobe and cathodoluminescence analysis performed at the “Eugen F. Stumpfl Laboratory” of the Montanuniversität Institute of Resource Mineralogy, University of Leoben - Leoben, Austria. The chromitites are composed of 40-70% in volume of chromite (~50% on average), 14-55% of talc (~30% on average), 3-60% of chromium rich chlorite (~20% on average), traces to 4% of iron hydroxides and traces to 3% of rutile (1,5% on average). The chromite occurs as large spherical aggregates or as fine grained subhedral crystals disseminated in the matrix. This aggregates have diameters of 0.3-1.5 cm (1 cm on average) and are extremely well rounded, massive to intensively fractured, and commonly deformed to ellipsoids. When observed under the microscope, these aggregates show well rounded to slightly irregular borders, but on their interiors, these structures are represented by fine to medium grained euhedral to subhedral chromite crystals that have sharp contacts between themselves. The rock's matrix is basically made of chlorite and talc that define a metamorphic foliation (Sn), being the talc an alteration product ...

Die Einschlüsse von Mineralien in krystallisirten Mineralien; deren chemische Zusammensetzung und die Art ihrer Entstehung,

Includes bibliographical references.

Boletín.

Mode of access: Internet.

Handbuch der krystallographischen Chemie /

"Tabellarischen Uebersicht des Krystallsystems der einfachen Stoffe und ihrer Verbindungen nach der Zusammsetzung": 14 p. at end.

Mémoires de chimie : contenant des analyses de minéraux /

Wrappers.

Analytical essays towards promoting the chemical knowledge of mineral substances /

Bound in brown leather; stamped in red and gold; edges stained yellow.

Manuel du minéralogiste : ou, Sciagraphie du règne minéral, distribuée d'après l'analyse chimique /

Includes index.

Untersuchungen über die Mischung der Mineralkörper und anderer damit verwandten Substanzen /

No more published.

Élémens de minéralogie appliquée aux sciences chimiques [microform] : ouvrage basé sur le méthode de M. Berzbelius contenant L'Histoire naturelle et métallurgique des substances minérales, leurs applications à la Pharmacie, à la Médecine et à l'Economic domestique : suivi d'un précis élémentaire de géognoise /

Includes index.

Examen chymique de différentes substances minérales; : essais sur le vin, les pierres, les bézoards, & d'autres parties d'histoire naturelle & de chymie;. Traduction d'une lettre de M. Lehmann, sur la mine de plomb rouge.. /

Includes index.

Equilibrium diagrams for minerals at low temperature and pressure.

Mode of access: Internet.

Chemie der Erde : Beiträge zur chemischen Mineralogie, Petrographie und Geologie

Mode of access: Internet.