MANTLE COMPONENTS IN LATE CENOZOIC VOLCANICS OF THE EAST SAYAN (FROM PB, SR, AND ND ISOTOPES)
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dc.contributor.author | Rasskazov S.V. | |
dc.contributor.author | Saranina E.V. | |
dc.contributor.author | Demonterova E.I. | |
dc.contributor.author | Maslovskaya M.N. | |
dc.contributor.author | Ivanov A.V. | |
dc.date.accessioned | 2021-07-20T07:47:17Z | |
dc.date.available | 2021-07-20T07:47:17Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=14997230 | |
dc.identifier.citation | Geologiya i geofizika, 2002, 43, 12, 1065-1079 | |
dc.identifier.issn | 0016-7886 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/29785 | |
dc.description.abstract | Space and time variations in Pb, Sr, and Nd isotope ratios in Late Cenozoic alkali-basalt lavas from the vast East Sayan territory allowed an interpretation of the volcanism evolution in the context of interaction of a plume-like mantle thermal anomaly with a moving lithospheric plate. Volcanism initiated 22-20 Ma ago in the northeastern Riphean Tuva-Mongolian massif (Urik segment), propagated westward through its northwestern part, and focused within the Caledonian East Tuva zone in the past 2 Ma. From 22 to 12 Ma ago, basaltic lavas contained a predominant common component of convecting mantle (probably, rising from greater depths) with high Pb and Nd and low Sr isotope ratios. The interaction of this material with the lithosphere produced a shallower lens with lower Pb and Nd and higher Sr ratios. This component first appeared 12-9.5 Ma ago and became part of all later volcanic products. The role of lithospheric material varied in space and time: Δ8/4Pb = 60-93 were in the range of the DUPAL anomaly in the Tuva-Mongolian basalts, below this range (20-54) in the East Tuva lavas, and intermediate (50-63) on the periphery of the massif. | |
dc.subject | Cenozoic | |
dc.title | MANTLE COMPONENTS IN LATE CENOZOIC VOLCANICS OF THE EAST SAYAN (FROM PB, SR, AND ND ISOTOPES) | |
dc.type | Статья | |
dc.subject.age | Cenozoic | |
dc.subject.age | Кайнозой | ru |
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