The First Finding of Sapphirine in Granulites of the Angara–Kan Block: Evidence of Ultra-High–Temperature Metamorphism in the SW Siberian Craton
| Autor: | O. M. Turkina, Dmitry P. Gladkochub, V. P. Sukhorukov |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Geochemistry Ultra-high-temperature metamorphism Metamorphism engineering.material 010502 geochemistry & geophysics Feldspar Granulite 01 natural sciences Craton Sapphirine visual_art Magmatism Earth and Planetary Sciences (miscellaneous) visual_art.visual_art_medium engineering General Earth and Planetary Sciences Geology 0105 earth and related environmental sciences Zircon |
| Zdroj: | Doklady Earth Sciences. 479:443-447 |
| ISSN: | 1531-8354 1028-334X |
| DOI: | 10.1134/s1028334x18040190 |
| Popis: | This work reports the first discovery of sapphirine-bearing mineral parageneses in granulites of the Angara–Kan block, information on the mineral assemblage of rocks, and the mineral composition. Based on mineral geothermometers utilizing alumina content in orthopyroxene, reconstruction of the composition of ternary feldspar, and the titanium content in zircon, it was revealed that the peak temperatures of metamorphism reached 1100°C, after which the rocks underwent cooling under sub-isobaric conditions. It is assumed that the pulse of ultra-high-temperature metamorphism correlates with processes of extension and intraplate magmatism during the age interval of 1.78–1.75 Ga. |
| Databáze: | OpenAIRE |
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