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High density mineral inclusions in rocks evidenced by Gamma-ray tomodensitometry

Domenii publicaţii > Ştiinţele pământului şi planetare + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Costel Rizescu, Gheorghe Georgescu, Octavian Duliu

Editorial: Journal of Trace and Microprobe Techniques, Volume 19, No. 1, p.119 - 129, 2001.

Rezumat:

A fragment of a polysulfide rock containing quartz and high density mineral inclusions has been investigated by using a 192-Iridium Gamma-ray dual computer tomograph. The tomographic image revealed the existence of three different mineral fractions, whose densities and effective atomic numbers, as calculated by means of the image histograms, were equal to 2.57 +/- 0.24 g/cm3 (Zeff = 11.6 +/- 2.1), 4.01 +/- 0.22 g/cm3 (Zeff = 25.1 +/- 2.1), and 6.01 +/- 0.90 g/cm3 (Zeff=68.5 +/- 6.0), respectively. Subsequently, these minerals were identified as quartz, a complex mixture of medium density polymetallic sulfide (pyrite, blenda, chalcopyrite, and spharelite), and galena as heavier component. A detailed mineralogical analysis confirmed these data.

Cuvinte cheie: Tomography, Densitometry, Gamma-ray, Mineral, Rock