Parental sources of high-alumina alkaline melts: Nd, Sr, Pb, and O isotopic evidence from the Devonian Kiya-Shaltyr gabbro-urtite intrusion, South Siberia V. V. Vrublevskii, I. F. Gertner, A. V. Chugaev
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ArticleSubject(s): изотопная геохимия | микроэлементный состав | Кия-Шалтырский габбро-уртитовый интрузив | девон | Южная СибирьGenre/Form: статьи в журналах Online resources: Click here to access online
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Doklady Earth Sciences Vol. 479, part 2. P. 518-523Abstract: The isotope geochemistry (Nd(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, 18OSMOW 8–10.5‰) and trace element compositio 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 (IOB and IAB components). In fold belts this led to the formation of hybrid high-alumina foidoite magmas.
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The isotope geochemistry (Nd(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, 18OSMOW 8–10.5‰) and trace element compositio 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 (IOB and IAB components). In fold belts this led to the formation of hybrid high-alumina foidoite magmas.
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