The crystalline basement of Estonia: rock complexes of the Palaeoproterozoic Orosirian and Statherian and Mesoproterozoic Calymmian periods, and regional correlations
| Autor: | Mati Niin, Juho Kirs, Heino Koppelmaa, Vello Klein, Väino Puura, Kristjan Urtson, Alvar Soesoo, Mare Konsa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Estonia
geography geography.geographical_feature_category Orosirian Volcanic arc Metamorphic rock Pluton lcsh:QE1-996.5 Geochemistry geochronology Fennoscandia stratigraphy Orogeny Granulite Statherian lcsh:Geology Precambrian Precambrian basement General Earth and Planetary Sciences Petrology Geology Water Science and Technology |
| Zdroj: | Estonian Journal of Earth Sciences, Vol 58, Iss 4, Pp 219-228 (2009) |
| ISSN: | 1736-4728 |
| Popis: | New data on the Fennoscandian Shield and the Baltic area suggest a need for reinterpretation of the stratigraphy of Estonian Precambrian rock complexes. The rocks of the Tallinn Zone formed in the framework of the Fennian orogeny at the margin of the Bergslagen microcontinent 1.90-1.88 Ga ago. The precise age of the Alutaguse Zone is not known. It may have formed either during the 1.93-1.91 Ga Lapland-Savo orogeny or as a rifted eastern part of the Tallinn Zone in the Fennian orogeny. The granulites of western and southern Estonia belong to the volcanic arcs inside the 1.84-1.80 Ga Svecobaltic orogenic belt and show peak metamorphic conditions of 1.78 Ga. Small shoshonitic plutons formed 1.83-1.63 Ga, the small granitic plutons of the Wiborg Rapakivi Subprovince 1.67-1.62 Ga, and the Riga pluton 1.59-1.54 Ga ago. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|