Geology of Ore Deposits

, Volume 58, Issue 2, pp 149–165 | Cite as

Formation conditions of paleovalley uranium deposits hosted in upper Eocene–lower Oligocene rocks of Bulgaria



The uranium deposits of Bulgaria related to the Late Alpine tectonomagmatic reactivation are subdivided into two groups: exogenic–epigenetic paleovalley deposits related to the basins filled with upper Eocene–lower Oligocene volcanic–sedimentary rocks and the hydrothermal deposits hosted in the coeval depressions. The geological and lithofacies conditions of their localization, the epigenetic alteration of rocks, mineralogy and geochemistry of uranium ore are exemplified in thoroughly studied paleovalley deposits of the Maritsa ore district. Argumentation of the genetic concepts providing insights into both sedimentation–diagenetic and exogenic–epigenetic mineralization with development of stratal oxidation zones is discussed. A new exfiltration model has been proposed to explain the origin of the aforementioned deposits on the basis of additional analysis with consideration of archival factual data and possible causes of specific ningyoite uranium ore composition.


Uranium Eocene Host Rock Oligocene Uranium Mineralization 
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© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  1. 1.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and GeochemistryRussian Academy of SciencesMoscowRussia

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