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Parental Sources of High–Alumina Alkaline Melts: Nd, Sr, Pb, and O Isotopic Evidence from the Devonian Kiya–Shaltyr Gabbro–Urtite Intrusion, South Siberia

Authors
  • Vrublevskii, V. V.1
  • Gertner, I. F.1
  • Chugaev, A. V.2
  • 1 Tomsk State University, Tomsk, 634050, Russia , Tomsk (Russia)
  • 2 Russian Academy of Sciences, Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Moscow, 630090, Russia , Moscow (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
Apr 01, 2018
Volume
479
Issue
2
Pages
518–523
Identifiers
DOI: 10.1134/S1028334X18040293
Source
Springer Nature
License
Yellow

Abstract

The isotope geochemistry (εNd(t) 4.8–5.4, 206Pb/204Pbin 18.05–18.36, 207Pb/204Pbin 15.53–15.57, 208Pb/204Pbin 37.59–37.83, 87Sr/86Sr(t) 0.7048–0.7057, δ18OSMOW 8–10.5‰) and trace element composition of the Kiya–Shaltyr gabbro–urtite pluton allow us to suggest a heterogeneous source and complex geodynamic settings of the Devonian alkali magmatism in the Kuznetsk Alatau. It is assumed that its evolution took place under conditions of partial mingling of matter of the depleted (PREMA) and enriched (EM) mantle with crustal contamination of the evolving melt. Such an interaction could have been a result of superposition of a mantle plume and an active margin (OIB and IAB components). In fold belts this led to the formation of hybrid high-alumina foidoite magmas.

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