Finding of corundum-bearing rocks in the Lapland granulite belt
- Authors: Terekhov E.N.1, Shcherbakova T.F.1, Konilov A.N.1
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Affiliations:
- Geological Institute
- Issue: Vol 470, No 1 (2016)
- Pages: 914-920
- Section: Geology
- URL: https://journals.rcsi.science/1028-334X/article/view/188846
- DOI: https://doi.org/10.1134/S1028334X16090208
- ID: 188846
Cite item
Abstract
Corundum-bearing rocks are described for the first time in the Kandalaksha structure of the Lapland granulite belt. Corundum is confined to rocks of two types: metagabbro‒anorthosites constituting lenses among metaanarthosites of the Kandalaksha massif and basic granulites. Corundum crystals (up to 200 μm long) occur in plagioclase and garnet and differ from each other depending on the host mineral, which serves as evidence against their xenogenic nature. Some corundum crystals exhibit an axial zone, which may indicate their crystallization from the gaseous phase. Corundum-bearing rocks are accompanied by piclogites (pyroxene‒garnet varieties with olivine). Piclogites and their minerals (clinopyroxene, garnet) are characterized by a positive Eu anomaly, which implies rock reworking by fluids during corundum formation, when deep-seated complexes were subjected to exhumation.
About the authors
E. N. Terekhov
Geological Institute
Author for correspondence.
Email: terex@ilran.ru
Russian Federation, Pyzhevskii per. 7, Moscow, 119017
T. F. Shcherbakova
Geological Institute
Email: terex@ilran.ru
Russian Federation, Pyzhevskii per. 7, Moscow, 119017
A. N. Konilov
Geological Institute
Email: terex@ilran.ru
Russian Federation, Pyzhevskii per. 7, Moscow, 119017