THE OLDEST ADAKITES OF THE FENNOSCANDIAN SHIELD

dc.contributor.author	Svetov S.A.
dc.contributor.author	Svetova A.I.
dc.contributor.author	Nazarova T.N.
dc.contributor.author	Huhma H.
dc.date.accessioned	2022-07-25T04:36:24Z
dc.date.available	2022-07-25T04:36:24Z
dc.date.issued	2004
dc.identifier	https://www.elibrary.ru/item.asp?id=13461739
dc.identifier.citation	Doklady Earth Sciences, 2004, 397, 6, 878-882
dc.identifier.issn	1028-334X
dc.identifier.uri	https://repository.geologyscience.ru/handle/123456789/38383
dc.description.abstract	Adakites are andesidacite–rhyolite rocks of trondhjemitic affinity characterized by high Na 2 O, Al 2 O 3 , Ba, and Sr contents and high Sr/Y and (La/Yb) n ratios [1, 2]. Adakitic rocks are only formed in a subduction setting [3]. They are typical components of Phanerozoic rock associations of active continental margins and island arcs. In the Archean, adakite findings are rare and mainly date to 2.7–2.8 Ga. This work presents the results of geochemical and Sm–Nd isotopic study of adakites that were found in the oldest (3.05–2.95 Ga) Fennoscandian basalt–andes-ite–dacite–rhyolite (BADR) island-arc association of the Upper Archean Vedlozero–Segozero greenstone belt.
dc.title	THE OLDEST ADAKITES OF THE FENNOSCANDIAN SHIELD
dc.type	Статья

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