Mineral composition and thermobarometry of metamorphic rocks of Western Ny Friesland, Svalbard
About authors
- 1 — Ph.D., Dr.Sci. Head of Department Empress Catherine II Saint Petersburg Mining University ▪ Orcid
- 2 — Junior Researcher Empress Catherine II Saint Petersburg Mining University ▪ Orcid
- 3 — Ph.D., Dr.Sci. Head of Department Russian Research Institute for Geology and Mineral Resources of the World Ocean named after I.S.Gramberg ▪ Orcid
Abstract
The results of the study of mineral composition and microstructure of representative metapelitic and calcic pelitic schist and amphibole-biotite gneiss, occurring in the northern part of the Western Ny Friesland anticlinorium, are reported. Mineral composition was analyzed with a JSM-6510LA scanning electron microscope with a JED-2200 (JEOL) energy dispersive spectrometer. Metamorphic conditions were assessed with various mineral geothermometers (garnet-biotite, Ti-in-biotite, Ti-in-muscovite, Ti-in-amphibole, garnet-amphibole, amphibole-plagioclase, and chlorite) and geothermobarometers (GASP, GBPQ, GRIPS, GBPQ, phengite, etc.). It has been shown that peak temperature and pressure for rocks of the Paleoproterozoic Atomfjella Series forming the western limb of the anticlinorium are consistent with those for the high-pressure part of the upper amphibolite facies (690-720 °С, 9-12 kbar), and the peak temperature and pressure for rocks of the Mossel Series occurring in the eastern limb and rest on the Atomfjella rock sequence, are consistent with the high-pressure part of the lower amphibolite facies (580-600 °С, 9-11 kbar). In addition to the high-temperature parageneses Ms-Bt-Grt-Pl (±Ky, St), Bt-Grt-Pl-Kfs-Cal (±Scp) and Bt-Hbl-Ep-Grt-Pl, the rocks of the both series display the low-temperature assemblage Ms-Chl-Ep-Ab-Prh-Ttn, which was formed upon transition from greenschist to prehnite-pumpellyite facies (260-370 °С).
Keywords:
metapelitic and calcic pelitic schist
amphibole-biotite gneiss
mineral thermobarometry
conditions of metamorphism
Ny Friesland
Svalbard
References
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