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MELANIE YAQUELIN GARCIA GARCIA

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Research paper thumbnail of Platinum-bearing placers of Siberian platform: mineral associations and their age characteristics as indicators of large igneous provinces manifested in old platform

ARCTIC AND SUBARCTIC NATURAL RESOURCES, 2018

The Siberian platform is known for numerous placers of platinum-group minerals (PGM), covering va... more The Siberian platform is known for numerous placers of platinum-group minerals (PGM), covering vast areas in river basins of Vilyui, Lena, Aldan, Anabar, and Olenek. However, bedrock sources for the deposits are still unknown. These placers have different mineralogical-geochemical characteristics, which is due to their varying PGM associations and specific typochemical features of the minerals. It is obvious that these Pt placers of large areal extent are associated with different productive platiniferous primary rocks forming within large igneous provinces (LIPs) of mafic-ultramafic formations. In an attempt to determine likely parent rocks for the placers we compared their mineralogical-geochemical compositions with those of basic-ultrabasic rock complexes. Correlation was also made between the Re-Os and 190 Pt-4 He ages of minerals of the Ir-Os-Ru composition, ferroan platinum, isoferroplatinum, and sperrylite from the placers and times of major magmatic events that occurred in the Siberian platform. The results obtained suggest that the sources for the studied Pt placers might be buried mafic-ultramafic rocks which are manifestations of major

Research paper thumbnail of Platinum-bearing placers of Siberian platform: mineral associations and their age characteristics as indicators of large igneous provinces manifested in old platform

ARCTIC AND SUBARCTIC NATURAL RESOURCES, 2018

The Siberian platform is known for numerous placers of platinum-group minerals (PGM), covering va... more The Siberian platform is known for numerous placers of platinum-group minerals (PGM), covering vast areas in river basins of Vilyui, Lena, Aldan, Anabar, and Olenek. However, bedrock sources for the deposits are still unknown. These placers have different mineralogical-geochemical characteristics, which is due to their varying PGM associations and specific typochemical features of the minerals. It is obvious that these Pt placers of large areal extent are associated with different productive platiniferous primary rocks forming within large igneous provinces (LIPs) of mafic-ultramafic formations. In an attempt to determine likely parent rocks for the placers we compared their mineralogical-geochemical compositions with those of basic-ultrabasic rock complexes. Correlation was also made between the Re-Os and 190 Pt-4 He ages of minerals of the Ir-Os-Ru composition, ferroan platinum, isoferroplatinum, and sperrylite from the placers and times of major magmatic events that occurred in the Siberian platform. The results obtained suggest that the sources for the studied Pt placers might be buried mafic-ultramafic rocks which are manifestations of major

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