Geologija / Geology
 ISSN 1392-110X ISSN 2029-056X (online) |
2007 m. Nr. 3 Evolution of prehnite–albite–calcite veins in
metamorphic rocks from the Lapland Granulite Belt
(Kandalaksha region of Kola Peninsula)
This study was focused on prehnite–albite–calcite veins cutting metamorphic rocks (e. g., amphibolite and granulite) from the Lapland Granulite Belt of the Kandalaksha region in Kola Peninsula. The mineral veins cut the older granitoid veins and metamorphic rocks. The presence of a prehnite–albite–calcite association in host rocks and older granitoid veins confirms the low-grade metamorphism of the prehnite–albite facies, which proceeded at a low temperature and pressure. The analyses (PM, SEM-EDS, XRD, IR, CL, 13C, 18O) have confirmed that epidote, calcite, hematite and goethite are the youngest. The obtained δ13C values of calcite confirm the mantle origin of carbon, whereas δ18O results indicate that calcite was crystallized in water of meteoric origin, which precipitated in the cold climate. The prehnite–albite–calcite veins were formed by telethermal processes induced by a hot spot.
Keywords: Lapland Granulite Belt, Kandalaksha, prehnite–albite–calcite veins, SEM-EDS, XRD, IR, thermal analysis, CL, stable isotopes analysis |
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