Тип публикации: статья из журнала
Год издания: 2009
Ключевые слова: Yenisey Ridge, metamorphism, Blagodat deposit, genesis, Rb, Sr, Nd, Sm isotopes, gold, Isotopic age, geochemistry, Riphean time
Аннотация: Neodymium and strontium isotopic composition and rare earth elements (REE) distribution pattern have been determined in whole rocks and minerals were separated from host metamorphic rocks and disseminated sulfide ores of the Blagodat gold deposit. Isotopic data are given to construct few isochrones that could be reflected an age ofПоказать полностьюmain stages of metamorphic and metasomatic alteration in rocks varieties during a successive accumulation of gold in structural traps. The significant temporal range in the forming of the studied rocks can be interpreted as an evidence of multi-stage tectonic destruction accompanying with trust-folding processes, shear deformations and development of local fracture zones that had place from the Late Riphean to Middle Paleozoic time. According to isotopic data basic ore-forming processes were realized in the relatively narrow interval from 690 to 750 Ma that correspond to a beginning of continental rifting on the western margin of Siberian craton. Chemistry and trace element distribution are closed for host and auriferous schists and mainly showed differences in the composition initial sedimentary units. The middle negative value ?Nd (from -14 to -16) and very high positive value ?Sr (from +570 to +725) are mostly corresponded to that of upper continental crust matter. The role of synchronic granite intrusions in the studied area can be only estimated due to a generation of thermal energy and crustal fluids.
Журнал: Journal of Siberian Federal University. Серия: Техника и технологии
Выпуск журнала: Т. 2, № 2
Номера страниц: 203-220
ISSN журнала: 1999494X
Место издания: Красноярск
Издатель: Федеральное государственное автономное образовательное учреждение высшего образования Сибирский федеральный университет