Szczegóły publikacji
Opis bibliograficzny
Exhumation and metamorphism of an ultrahigh-grade terrane : geochronometric investigations of the Sudete Mountains (Bohemia), Poland and Czech Republic / S. M. Gordon, D. A. Schneider, M. MANECKI, D. K. Holm // Journal of the Geological Society ; ISSN 0016-7649. — 2005 — vol. 162 pt. 5, s. 841–855. — Bibliogr. s. 853–855, Abstr.
Autorzy (4)
- Gordon S. M.
- Schneider David A.
- AGHManecki Maciej
- Holm Daniel K.
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 23280 |
|---|---|
| Data dodania do BaDAP | 2005-09-22 |
| Tekst źródłowy | URL |
| DOI | 10.1144/0016-764904-078 |
| Rok publikacji | 2005 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of the Geological Society |
Abstract
The Sudete Mountains, NE Bohemian Massif (Czech Republic and Poland), preserve abundant eclogitic and granulitic centimetre- to decimetre-scale boudins enveloped in a predominantly migmatitic matrix. Published geochronometry and thermobarometry from the UHP and UHT rocks broadly constrain the crystallization and initial stage I exhumation history for these units; however, the timing of stage 2 metamorphism and associated unroofing is less well constrained. New in situ ion microprobe Th-Pb monazite results, together with complementary U-Pb zircon and electron microprobe analyser total-Pb monazite results, on 11 amphibolite-facies gneissic to migmatitic samples, place important temporal constraints on the second stage of UHP and UHT metamorphism-exhumation. The Orlica-Snieznik Dome records UHP metamorphism occurring at 375 Ma and subsequent exhumation to midcrustal levels in supra-Barrovian conditions at c. 345330 Ma. In contrast, the western Gory Sowie Block preserves evidence of HP-granulite conditions at c. 400 Ma, and exhumation to mid-crustal levels at 380-370 Ma, revealing a c. 30 million years difference in exhumation events between the neighbouring terranes. The eastern Gory Sowie Block preserves ages similar to the Orlica-Sneiznik Dome, suggesting that different preserved metamorphic-cooling histories are juxtaposed across the Sudetic Marginal fault. The bounding Niemcza shear zone yields preliminary Th-Pb dates that range from 380 +/- 8 Ma to 283 +/- 2 Ma, preserving a protracted metamorphic record that spans the exhumation history of the region. The distinct collapsed geochronologies of both terranes probably reflect rapid vertical transport of low-viscosity crust under supra-Barrovian conditions near the mid-crustal high-strength lid during oblique (transpressional) convergence.
