Resumo
For the first time, poorly-rounded gold of ore habit was found in intergrowth with quartz, feldspar, ilmenite, zircon and other minerals, along with well-rounded placer gold, when studying the mineralogical and geochemical features of native gold from the Cretaceous conglomerates of the central part of the Aldan-Stanovoy shield. However, upon detailed study, it was found that gold of ore habit belongs to gold of the pseudo-ore habit. This gold is characterized by a pitted-tubercular surface, “intergrowths” of gold with minerals of the host deposits and through holes. Discovery of gold of the pseudo-ore habit in the Cretaceous conglomerates indicates the transformation of placer gold as a result of diagenesis processes, and not the superimposed later ore mineralization. Gold of the pseudo-ore habit was previously discovered in the Devonian conglomerates of the Timan Ridge, as well as in the Jurassic and Permian conglomerates of the east of the Siberian Platform. Presence of such gold was the reason for searching for ore sources in the studied territories, which did not lead to positive results. In general, identification of gold of pseudo-ore habit in conglomerates of various ages from the Archean to the Cenozoic makes it possible to more correctly predict the formation of gold deposits and select search methods.