AGE LIMITS OF HIGH-GRADE METAMORPHIC SUPRACRUSTAL COMPLEXES IN THE CENTRAL ALDAN SHIELD: SM-ND ISOTOPIC DATA
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dc.contributor.author | Kovach V.P. | |
dc.contributor.author | Kotov A.B. | |
dc.contributor.author | Sal'nikova E.B. | |
dc.contributor.author | Velikoslavinskii S.D. | |
dc.contributor.author | Zagornaya N.Yu. | |
dc.contributor.author | Berezkin V.I. | |
dc.contributor.author | Smelov A.P. | |
dc.date.accessioned | 2021-01-11T07:52:42Z | |
dc.date.available | 2021-01-11T07:52:42Z | |
dc.date.issued | 1999 | |
dc.identifier | https://elibrary.ru/item.asp?id=13314681 | |
dc.identifier.citation | Stratigraphy and Geological Correlation, 1999, , 1, 1-14 | |
dc.identifier.issn | 0869-5938 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/22644 | |
dc.description.abstract | First investigation results on Sm-Nd isotope systems in clastic metasedimentary and metavolcanic rocks from the high-grade metamorphic supracrustal complexes of central Aldan Shield are used to approximately evaluate their maximum age boundary. It is established that the Upper Archean rocks (model age TNd(DM) = 3.3-2.6 Ga) served as a principal source material for metapelites of the Kurumkan Group; metapelites and metagraywackes of the Amedichi Group; and also for the metagraywackes of the Kurulta, Zverev, and Seim groups. Provenances with the Early Archean model age (TNd(DM) = 3.5 Ga) are found to be appropriate only for few rock samples from the Kurumkan and Kurulta groups. The Early Proterozoic age (TNd(DM) = 2.5-2.2 Ga) is inferred for the protolith material of supracrustal rocks of the Chuga, Kholbolokh, Kyurikan, Idzhek, and Fedorov groups. The data obtained suggest that supracrustal rocks of the Aldan granulite-gneiss and East Olekma granite-greenstone terranes were formed not in the Early Archean, as it was formerly believed, but at the Late Archean and/or Early Proterozoic stages of geologic evolution of the shield. | |
dc.subject | Proterozoic | en |
dc.subject | Archean | en |
dc.title | AGE LIMITS OF HIGH-GRADE METAMORPHIC SUPRACRUSTAL COMPLEXES IN THE CENTRAL ALDAN SHIELD: SM-ND ISOTOPIC DATA | |
dc.type | Статья | |
dc.subject.age | Precambrian::Proterozoic | en |
dc.subject.age | Precambrian::Archean | en |
dc.subject.age | Докембрий::Протерозой | ru |
dc.subject.age | Докембрий::Архей | ru |
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