Petrographic relations and uranium distribution in the Skaloti granitoid complex, Paranestion district, Greek Macedonia
The Skaloti granitoid complex consists, for the most part, of biotite granites. The granites are composed of quartz, K-feldspar (mainly microcline), plagioclase, and biotite, with less common muscovite and rare hornblende. Common accessories are allanite, apatite, sphene, epidote, monazite, and garnet. The complex is divided on the basis of texture into two groups-granular and foliated--which have distinct accessory mineralogy. Epidote and sphene coexisting with biotite are relatively abundant in the foliated types; garnet is found only in the granular types. The granular granitoid group includes a leucocratic facies that occurs along the central part of the granitoid terrain. The leucocratic rocks show alteration and mechanical deformation and consist of quartz, feldspar, minor amounts of mica, garnet, and disseminated sulfides (pyrite, chalcopyrite). Sulfide mineralization and hematitization are associated with the microfractures. The alkali enrichment, potassium affinity, moderate to high thorium contents, and presence of uranium-bearing accessory minerals render the complex a possible uranium source rock. The two groups of granitoids (granular, foliated) identified in Skaloti differ in the crystal chemical character of the uranium that they contain. In the foliated granites, the accessory minerals contain most of the uranium and represent refractory uranium sites. Granular granites, on the other hand, contain relatively high soluble uranium; these uranium sites in which uranium is not firmly chemically bound, are related to fragmentation and hydrothermal alteration undergone by the leucocratic granites, and to deuteric and low-temperature alteration which, overall, has affected the rocks of this group. The total uranium contents (U/TAU/) of the analyzed surface samples range between 1 and 39 ppm.
- Research Organization:
- Geological Laboratory, University of Patras, Patras, Greece
- OSTI ID:
- 6012747
- Journal Information:
- Econ. Geol.; (United States), Journal Name: Econ. Geol.; (United States) Vol. 77:8; ISSN ECGLA
- Country of Publication:
- United States
- Language:
- English
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58 GEOSCIENCES
580300 -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
ACTINIDES
AMPHIBOLE
ANORTHOSITES
BIOTITE
CENOZOIC ERA
CHALCOGENIDES
CHEMISTRY
COMMINUTION
CRYSTALLIZATION
DEPOSITION
DEVELOPING COUNTRIES
EASTERN EUROPE
ELEMENTS
EUROPE
FELDSPARS
FRACTURING
GABBROS
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC STRUCTURES
GRANITES
GREECE
HORNBLENDE
IGNEOUS ROCKS
MAGNETISM
METALS
MICA
MINERAL RESOURCES
MINERALOGY
MINERALS
MUSCOVITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROGRAPHY
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
PRESSURE DEPENDENCE
QUARTZ
RESOURCES
ROCKS
SATURATION
SILICATE MINERALS
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE EFFECTS
TERTIARY PERIOD
URANIUM
URANIUM DEPOSITS