Thermochronology of the west Sudetes (Bohemian Massif): Rapid and repeated eduction in the eastern Variscides, Poland and Czech Republic

Clicks: 19
ID: 297860
2006
Free PDF
Article Quality & Performance Metrics
Overall Quality
Not rated
Combines reader engagement with the AI quality analysis. This article has not been analysed, so there is no overall score — reader engagement is measured and shown alongside.
AI Quality Assessment
Not analyzed
Readership in this journal
Emerging

Ranked #4,499 of 8,486 articles by views in american journal of science

Most read Least read

Bar heights use a square-root scale. Only the 120 most-read articles are drawn; the journal has 8,486 in total.

Mint this article as an NFT
Not yet minted

Create a permanent, verifiable on-chain record of this article on the Scimatic Network. The NFT is held in your Journament account, and you can withdraw it to your own wallet at any time.

5 SUSD one-off · no wallet required
Sign in to mint
Abstract
The Sudete Mountains of northeastern Bohemian Massif were amalgamated during the closure of the Rheic ocean, culminating with Variscan orogenesis, and contain occurrences of high-pressure granulite and small relict ultrahigh-pressure eclogite formed during subduction. We performed 40Ar/39Ar thermochronometry on primarily amphibolite-facies gneisses and schists from two crustal blocks within the Sudetes: Góry Sowie and Orlica-Snieznik massifs. Hornblende and mica plateau ages from the mountainous portion of the Góry Sowie reflect relatively rapid cooling between 382 ± 1 Ma and 373 ± 0.5 Ma, following peak conditions at ca. 400 Ma. Kyanite-sillimanite and cordierite-garnet mineral growth textures denote near isothermal decompression during eduction. Concordant hornblende and biotite cooling ages obtained from the eastern, topographically flat region adjacent to the Niemcza shear zone indicate markedly younger cooling at 337 ± 0.8 Ma. 40Ar/39Ar results from the Snieznik Mountains, 50 km to the south, yield plateau cooling ages for white mica and biotite between 341 ± 1 to 337 ± 0.6 Ma and 342 ± 1 to 334 ± 0.6 Ma, respectively, and are remarkably similar in age to an amphibolite-facies overprinting episode. Mica analyses from the Orlica Mountains also yield cooling ages between 338 ± 0.9 to 335 ± 0.5 Ma. Thermochronometry illustrates temporally disparate cooling histories but similar metamorphic evolutions between the Góry Sowie Block and the Orlica-Snieznik Complex. In both terranes, it took ∼35 m.y. from the time of peak high-pressure conditions to residence in the upper crust, and possibly as little as 10 m.y. between high-pressure and mid-crustal supra-Barrovian events. These results in light of regional geochronology illustrate the rapid, localized and repetitious nature of eduction/exhumation of the Sudetic orogenic root including the eclogite and HP-granulite assemblages during protracted subduction.
Reference Key
openalex_W1989039935 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors David Schneider, Stephen J. Zahniser, J. M. Glascock, Stacia M. Gordon, Maciej Manecki
Are you one of these authors? Claim your profile
Journal american journal of science
Year 2006
DOI
10.2475/10.2006.03
URL
https://doi.org/10.2475/10.2006.03
Keywords Keywords not found

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.