From migmatites to crustal granites: Pb–Pb isotopic system of feldspars of partial melting products, Northern Ladoga region, Fennoscandinavian Shield

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• 作者：Sh. K. Baltybaev ; G. V. Ovchinnikova ; V. A. Glebovitskii…
• 刊名：Doklady Earth Sciences
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：468
• 期：2
• 页码：541-544
• 全文大小：578 KB
• 刊物主题：Earth Sciences, general;
• 出版者：Springer US
• ISSN：1531-8354
• 卷排序：468

文摘

The isotopic–geochemical features of late and postorogenic granites of the S type and ambient migmatites are studied within the Russian part of the Svecofennian orogen of the Fennoscandinavian Shield. The spatial association of leucosomes of migmatites and granites of the S type and their similar petro- and geochemistry and distribution of Pb isotopes are evidence of the genetic similarity of their parental melts. The Borodinskoe pluton has a more primitive 206Pb/207Pb ratio, which indicates the presence of upper and U-poor lower crustal material in the source of granitic magmas. This conclusion is supported by the ɛ_Nt(t) lower value of granites of this pluton relative to those of other plutons of the region.Original Russian Text © Sh.K. Baltybaev, G.V. Ovchinnikova, V.A. Glebovitskii, I.M. Vasil’eva, N.G. Rizvanova, 2016, published in Doklady Akademii Nauk, 2016, Vol. 468, No. 4, pp. 421–424.