ENRICHED ND-SR-PB ISOTOPIC SIGNATURES IN THE DOVYREN LAYERED INTRUSION ( EASTERN SIBERIA, RUSSIA): EVIDENCE FOR SOURCE CONTAMINATION BY ANCIENT UPPER-CRUSTAL MATERIAL

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dc.contributor.author Amelin Yu.V.
dc.contributor.author Neymark L.A.
dc.contributor.author Ritsk E.Yu.
dc.contributor.author Nemchin A.A.
dc.date.accessioned 2020-12-01T08:37:38Z
dc.date.available 2020-12-01T08:37:38Z
dc.date.issued 1996
dc.identifier https://elibrary.ru/item.asp?id=13241903
dc.identifier.citation Chemical Geology, 1996, , 1, 39-69
dc.identifier.issn 0009-2541
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/20006
dc.description.abstract Major- and trace-element concentrations and Nd-, Sr- and Pb-isotopic ratios are reported for the Dovyren layered mafic-ultramafic intrusion in the northern Baikal region, eastern Siberia. SmNd internal isochrons for an olivine gabbro from the layered series and a gabbronorite from a sill at the bottom of the Dovyren intrusion yield ages of 673 ± 22 and 707 ± 40 Ma, respectively. Initial isotopic ratios: (673) from 0.7101 to 0.7135, ϵNd(673 Ma) from −16.3 to −14.1 from 16.80 to 17.14, from 15.477 to 15.501 and from 37.17 to 37.59, are similar to those of late Archean-early Proterozoic upper continental crust, but do not appear to be a result of wallrock assimilation in the magma chamber. These isotopic features, as well as high K, Rb and LREE and low Ti concentrations in the calculated composition of the Dovyren parental magma, may be explained by subduction of sediments derived from upper continental crust into depleted mantle and subsequent melting of the metasomatized peridotite.
dc.subject Proterozoic en
dc.subject Archean en
dc.title ENRICHED ND-SR-PB ISOTOPIC SIGNATURES IN THE DOVYREN LAYERED INTRUSION ( EASTERN SIBERIA, RUSSIA): EVIDENCE FOR SOURCE CONTAMINATION BY ANCIENT UPPER-CRUSTAL MATERIAL
dc.type Статья
dc.subject.age Precambrian::Proterozoic en
dc.subject.age Докембрий::Протерозой ru
dc.subject.age Precambrian::Archean en
dc.subject.age Докембрий::Архей ru


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