Age of Granulites of the Cheremshanskaya Unit (Sharyzhalgai Uplift, Siberian Craton, Russia): New Data
| Autor: | Alexander V. Ignatiev, Elena I. Demonterova, V. I. Levitskii, A. I. Khanchuk, I. V. Levitskii, T. A. Velivetskaya, S. V. Vysotskiy |
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| Rok vydání: | 2020 |
| Předmět: |
geography
geography.geographical_feature_category 010504 meteorology & atmospheric sciences Archean Geochemistry Metamorphism 010502 geochemistry & geophysics Granulite 01 natural sciences Craton Stage (stratigraphy) Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Sedimentary rock Protolith Geology 0105 earth and related environmental sciences Zircon |
| Zdroj: | Doklady Earth Sciences. 491:238-242 |
| ISSN: | 1531-8354 1028-334X |
| DOI: | 10.1134/s1028334x20040212 |
| Popis: | The present paper presents new U–Pb and Sm–Nd age data obtained for granulites of the Cheremshanskaya Unit enclosing metamorphosed volcano-sedimentary sulfide ores, in which sulfur isotope mass-independent fractionation (MIF–S) was established. Zircons from orthotectites that cut hosted paragranulites yielded aconcordant U–Pb age of 1866.8 ± 7.6 Ma, reflecting the final stage of granulite metamorphism. The model age (ТND (DM)) of ~3.0 Ga obtained for graphite–sulfide–cordierite (±Bt) and garnet–biotite–orthopyroxene paragneisses indicates that the protolith of sedimentary rocks was formed in the Mesoarchaean. As evidenced from various sources, the Sm–Nd isotopic characteristics of orthotectites differ from those of paragneisses. |
| Databáze: | OpenAIRE |
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