Au-Pd-Cu-Se-U MINERALIZATION OF SVETLOYE ORE OCCURRENCE IN CENTRAL KARELIA
DOI:10.24411/0869-5997-2020-10006
Keywords:
Au-Pd-Cu-Se-U mineralization, gold, palladseite, porpezite, palladium cuproauride, metasomatic alteration, Paleoproterozoic, Karelia.Abstract
Au-Pd-Cu-Se-U mineralization of Svetloye ore occurrence in Central Karelia, was deposited near the earth surface and affected by the supply of selenium, copper, lead, noble metals, uranium and intense oxidation (~1500 Ma). The mineralization contains chalcopyrite, bornite, clausthalite and rarer selenides, finely dispersed native gold (Ag 1-13 %), Au-Cu-phases (porpezite and cuproauride), globular Au-Pd-Se and Pd-As-Sb intergrowths, the minerals of uranium and rare-earth elements, as well as hematite, goethite, chalcosine and more complex oxidation-zone compounds. The ore mineralization is confined to a zone of low-temperature alkaline metasomatism and fault of Mg-Fecomponents which formed near the gabbro-dolerite-carbonate rock contact. The alteration pattern and ore mineralization of Svetloye occurrence are similar to those of Padma-type Au-Cu-U deposits in the Onega Structure and some localities of the Lapland Greenstone Belt, Finland.
