, Volume 26, Issue 1, pp 29–46 | Cite as

The Composition and Age of the Mesoarchean Gabbro in the South Vygozersky and Kamennoozersky Greenstone Structures, Karelia



The geochemical and zircon geochronological (U-Pb, SHRIMP-II) study of Mesoarchean gabbros of the South Vygozersky and Kamennoozersky greenstone structures of Central Karelia made it possible to distinguish four gabbro types: (1) Fe–Ti gabbro, 2869 ± 12 Ma, (2) gabbro compositionally close to tholeiitic basalts, 2857 ± 7 Ma, (3) leucogbabbro, 2840 ± 5 Ma; and (4) melanogabbro, 2818 ± 14 Ma. From the early to late gabbros, the rocks are depleted in Ti, Fe, V, Y, Zr, Nb, Hf, REE and enriched in Mg, Ca, Cr, Ni. According to the systematics (Condie, 2005), the Nb/Y, Zr/Y, Zr/Nb ratios in the studied Late Archean gabbros are close to those of primitive mantle, while the gabbros in composition are similar to those of plumederived ocean-plateau basalts. Their magma sources were derived from different mantle reservoirs. The leucogabbro and melanogabbro with similar εNd = +4 were derived from a depleted mantle source (DM). The gabbro close in composition to tholeiitic basalts and having the elevated positive εNd (+4.9) was derived from a strongly depleted mantle source. Insignificant admixture of crustal material or lithospheric mantle is inferred in a source of the Fe–Ti gabbro (with lowest εNd = +2.1).


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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • T. A. Myskova
    • 1
  • I. A. Zhitnikova
    • 2
  • P. A. Lvov
    • 2
  1. 1.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia
  2. 2.All-Russian Research Geological Institute (VSEGEI)St. PetersburgRussia

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