Aranovich, L Ya; Dubinina, Elena O; Avdeenko, Anna S; Lebedeva, YuM; Bushmin, S A; Dolivo-Dobrovol'skii, D D (2010): Chemical and isotopic compositions of rocks and minerals from the Palenyi Island, Por'ya Guba (Bay), White Sea [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.786975, Supplement to: Aranovich, LY et al. (2010): Oxygen isotopic composition of coexisting minerals of sillimanite-hypersthene rocks from the Por'ya Bay area: Evidence of fluid involvement in granulite-fades metamorphism. Translated from Geokhimiya, 2010, 48(8), 787-800, Geochemistry International, 48(8), 739-751, https://doi.org/10.1134/S001670291008001X
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Abstract:
Hypersthene-garnet-sillimanite-quartz enclaves were studied in orthopyroxene-plagioclase and orthopyroxene-clinopyroxene crystalline schists and gneisses from shear zones exposed in the Palenyi Island within the Early Proterozoic Belomorian Mobile Belt. Qualitative analysis of mineral assemblages indicates that these rocks were metamorphosed to the granulite facies (approximately 900°C and 10-11 kbar). Oxygen isotopic composition was determined in rock-forming minerals composing zones of the enclaves of various mineral and chemical composition. Closure temperatures of the isotopic systems obtained by methods of oxygen isotopic thermometry are close to values obtained with mineralogical geothermometers (garnet-orthopyroxene and garnet-biotite) and correspond to the high-temperature granulite facies (860-900°C). Identified systematic variations in d18O values were determined in the same minerals from zones of different mineral composition. Inasmuch as these zones are practically in contact with one another, these variations in d18O cannot be explained by primary isotopic heterogeneity of the protolith. Model calculations of the extent and trend of d18O variations in minerals suggest that fluid-rock interaction at various integral fluid/rock ratios in discrete zones was the only mechanism that could generate the zoning. This demonstrates that focused fluid flux could occur in lower crustal shear zones. Preservation of high-temperature isotopic equilibria of minerals testifies that the episode of fluid activity at the peak of metamorphism was very brief.
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Archive of Ocean Data (ARCOD)
Coverage:
Median Latitude: 66.678972 * Median Longitude: 33.865828 * South-bound Latitude: 66.677600 * West-bound Longitude: 33.863900 * North-bound Latitude: 66.680200 * East-bound Longitude: 33.867900
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Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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6 datasets
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Datasets listed in this publication series
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 1) Bulk chemical composition of Mg-Al-Si rocks from the Palenyi Island, Por'ya Bay. https://doi.org/10.1594/PANGAEA.786969
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 2) Brief characteristics of samples from the Palenyi Island and oxygen mole fractions corresponding to major rock-forming minerals. https://doi.org/10.1594/PANGAEA.786970
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 3a) Composition of biotite in Mg-Al-Si granulites from the Palenyi Island, Por'ya Bay. https://doi.org/10.1594/PANGAEA.786971
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 3b) Composition of garnet in Mg-Al-Si granulites from the Palenyi Island, Por'ya Bay. https://doi.org/10.1594/PANGAEA.786972
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 3c) Composition of orthopyroxene in Mg-Al-Si granulites from the Palenyi Island, Por'ya Bay. https://doi.org/10.1594/PANGAEA.786973
- Aranovich, LY; Dubinina, EO; Avdeenko, AS et al. (2010): (Table 4) Oxygen isotopic composition of minerals and bulk rocks from the Palenyi Island, Por'ya Bay. https://doi.org/10.1594/PANGAEA.786974