Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Nappe Imbrication Within the Phyllite-Quartzite Unit of West Crete: Implications for Sustained High-Pressure Metamorphism in the Hellenide Subduction Orogen, Greece
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0003-3347-9284
Show others and affiliations
Number of Authors: 62022 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 41, no 11, article id e2022TC007430Article in journal (Refereed) Published
Abstract [en]

We report four K-Ar fault-gouge and eight U-Pb calcite ages from the high-pressure Phyllite-Quartzite Unit (PQ) and the overlying, strongly thinned non-high-pressure Tripolitza and Pindos units of western Crete, Greece. We relate consistent 26–21 Ma fault-gouge ages to a discrete top-to-the-S, brittle-ductile, contractional shear zone (Intra-PQ Thrust) that formed during high-pressure conditions within the Phyllite-Quartzite Unit. The Intra-PQ Thrust separates the Phyllite-Quartzite Unit into an upper and a lower unit and is associated with gypsum deposits and high finite strain. Below the Intra-PQ Thrust, U-Pb calcite ages between about 16 and 13 Ma are also associated with top-to-the-S kinematic indicators and, in part, developed during aragonite stability. The brittle-ductile contact zone to the overlying Tripolitza and Pindos units yielded U-Pb calcite ages of 13 to 12 Ma. Our data imply that the upper Phyllite-Quartzite Unit underwent high-pressure metamorphism at the commonly envisaged time of 24–21 Ma. However, the lower Phyllite-Quartzite Unit started to be underthrust at 26–21 Ma and was high-pressure metamorphosed at 16–13 Ma, as suggested by the U-Pb calcite ages of aragonite-bearing samples and published zircon fission track ages. We discuss a tectonic model of successive underthrusting, high-pressure metamorphism and subsequent exhumation of both Phyllite-Quartzite units in extrusion wedges until 12–11 Ma, after which Crete underwent crustal extension. Our work suggests that there might be more than one Cretan Detachment. It also has implications for sustained underthrusting and exhumation of continental crust in subduction zones.

Place, publisher, year, edition, pages
2022. Vol. 41, no 11, article id e2022TC007430
Keywords [en]
high-pressure metamorphism, structural analysis, geochronology, subduction zone processes, Crete, Greece
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-212579DOI: 10.1029/2022TC007430ISI: 000928053800007Scopus ID: 2-s2.0-85142869531OAI: oai:DiVA.org:su-212579DiVA, id: diva2:1719819
Available from: 2022-12-16 Created: 2022-12-16 Last updated: 2023-04-11Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Ring, Uwe

Search in DiVA

By author/editor
Ring, Uwe
By organisation
Department of Geological Sciences
In the same journal
Tectonics
Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 48 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf