HIGH DENSITY MINERAL INCLUSIONS IN ROCKS EVIDENCED BY γ-RAY TOMODENSITOMETRY

A fragment of a polysulfide rock containing quartz and high density mineral inclusions has been investigated by using a 192 Ir γ-ray dual computer tomograph. The tomographic image revealed the existence of three different mineral fractions, whose densities and effective atomic numbers, as calculated...

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Bibliographic Details
Published inJournal of trace and microprobe techniques Vol. 19; no. 1; pp. 119 - 129
Main Authors Rizescu, Costel T., Georgescu, Gheorghe N., Duliu, Octavian G.
Format Journal Article
LanguageEnglish
Published Monticello, NY Taylor & Francis Group 28.03.2001
Dekker
Subjects
Densitometry
Earth sciences
Earth, ocean, space
Exact sciences and technology
Mineral
Mineralogy
Mineralogy: general, methodology, regional studies
Rock
Tomography
γ-ray
sphalerite
iron sulfides
density
quartz
galena
pyrite
mineral inclusions
mineral assemblages
tomography
silicates
framework silicates
chalcopyrite
sulfides
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Summary:A fragment of a polysulfide rock containing quartz and high density mineral inclusions has been investigated by using a 192 Ir γ-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 × 10 3 kg/m 3 (Z eff = 11.6 ± 2.1), 4.01 ± 0.22 × 10 3 kg/m 3 (Z eff = 25.1 ± 2.1), and 6.01 ± 0.90 × 10 3 kg/m 3 (Z eff = 68.5 ± 6.0), respectively. Subsequently, these minerals were identified as quartz, a complex mixture of medium density polymetallic sulfide (pyrite, blenda, chalcopyrite, and sphalerite), and galena as heavier component. A detailed mineralogical analysis confirmed these data.
ISSN:0733-4680
1532-2270
DOI:10.1081/TMA-100001467