Découverte d'indices uranifères à l'extrémité orientale du massif granitique de la Maladeta (Pyrénées centrales espagnoles); contexte géologique et métallogénique  [Discovery of uraniferous occurrences in the eastern extremity of the Maladeta granitic massif (central Pyrenees, Spain); geological and metallogenic context]

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Alternate Title:Discovery of uraniferous occurrences in the eastern extremity of the Maladeta granitic massif (central Pyrenees, Spain); geological and metallogenic context
Authors:Charlet, J. M.
Author Affiliations:Primary:
Fac. Polytech. Mons, Serv. Géologie Fondamentale Appliquée, Mons, Belgium
Volume Title:Comptes Rendus de l'Académie des Sciences, Série 2, Mécanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Source:Comptes Rendus de l'Académie des Sciences, Série 2, Mécanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre, 314(7), p.683-690. Publisher: Gauthier-Villars, Montrouge, France. ISSN: 0764-4450
Publication Date:1992
Note:In French with English summary. 7 refs.; illus. incl. 2 tables
Summary:Uraniferous stratiform anomalies discovered in the Silurian black shales of the central Pyrenees, described previously by the author, have also been found to be present in and along both hornblende and pyroxene hornfels facies up to contact with the Maladeta granite. Moreover, more pronounced anomalies, described in this paper, occur in the Lower Devonian hornfels and even lead locally to the development of uraniferous minerals. Autoradiography and microprobe analyses have enabled the presence of brannerite associated with apatite to be identified. The genesis of the U occurrences is discussed. Uranium is probably remobilized from the Silurian black shales. Another possible source may stem from veins of alkaline granite with a high Th/U ratio. [M.L.]
Subjects:Anomalies; Black shale; Clastic rocks; Contact metamorphism; Devonian; Electron probe data; Granites; Igneous rocks; Metal ores; Metamorphism; Paleozoic; Plutonic rocks; Provenance; Sedimentary rocks; Silurian; Spectra; Uranium ores; X-ray spectra; Aragon Spain; Europe; Huesca Spain; Iberian Peninsula; Pyrenees; Southern Europe; Spain; Spanish Pyrenees; Northeastern Spain
Abstract Numbers:93M/671
Record ID:1993013042
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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