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Petrology

, Volume 26, Issue 3, pp 246–254 | Cite as

Specifics of the Neoarchean Plume–Lithospheric Processes in the Kola–Norwegian Province of the Fennoscandian Shield: II. Petrology and Geodynamic Nature of Komatiite–Tholeiite Association

  • A. B. Vrevskii
Article
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Abstract

Numerical modeling of the generation and evolution of parental melts of the komatiite–tholeiite association of the Uraguba structure was carried out using previously obtained geochemical and isotope data. It was established that komatiite, komatiite and tholeiite basalts depleted in LREE and having εNd(Т = 2.79) = +2.9…+3.2 were generated by equilibrium partial melting (F > 15%) of a depleted source (garnet-bearing Ol0.63 + Opx0.22 + Cpx0.06 + Grt0.09 mantle peridotite) at 4–8 GPa, while the genesis of primary melts of LREE-enriched komatiites (LaN/SmN ~ 1.2–1.6) with εNd(Т = 2.79) = +2.5…+2.2 was related to the equilibrium partial melting (F > 20%) of an “enriched mantle peridotite” (EM–Ol0.60 + Opx0.20 + Cpx0.08 + Grt0.12) at pressure of 2.5–4 GPa. Coexistence in space and time of two types of melting products of mantle peridotites formed at different depths is explained by melting of different parts of adiabatically ascending mantle plume.

Keywords

Uraguba structure Fennoscandian shield Neoarchean komatiite Nd isotope composition genesis partial melting mantle plume 

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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, Institute of Earth SciencesSt Petersburg State UniversitySt. PetersburgRussia

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