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dc.contributor.author
Schulmann, Karel
dc.contributor.author
Lexa, Ondrej
dc.contributor.author
Štípská, Pavla
dc.contributor.author
Racek, Martin
dc.contributor.author
Tajčmanová, Lucie
dc.contributor.author
Edel, Jean-Bernard
dc.contributor.author
Peschler, Anne
dc.contributor.author
Lehmann, Jérémie
dc.date.accessioned
2021-07-26T07:40:50Z
dc.date.available
2017-06-10T10:44:49Z
dc.date.available
2021-07-26T07:40:50Z
dc.date.issued
2008-02
dc.identifier.issn
0263-4929
dc.identifier.issn
1525-1314
dc.identifier.other
10.1111/j.1525-1314.2007.00755.x
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/58114
dc.description.abstract
A large database of structural, geochronological and petrological data combined with a Bouguer anomaly map is used to develop a two-stage exhumation model of deep-seated rocks in the eastern sector of the Variscan belt. An early sub-vertical fabric developed in the orogenic lower and middle crust during intracrustal folding followed by the vertical extrusion of the lower crustal rocks. These events were responsible for exhumation of the orogenic lower crust from depths equivalent to 18−20 kbar to depths equivalent to 8−10 kbar, and for coeval burial of upper crustal rocks to depths equivalent to 8–9 kbar. Following the folding and vertical extrusion event, sub-horizontal fabrics developed at medium to low pressure in the orogenic lower and middle crust during vertical shortening. Fabrics that record the early vertical extrusion originated between 350 and 340 Ma, during building of an orogenic root in response to SE-directed Saxothuringian continental subduction. Fabrics that record the later sub-horizontal exhumation event relate to an eastern promontory of the Brunia continent indenting into the rheologically weaker rocks of the orogenic root. Indentation initiated thrusting or flow of the orogenic crust over the Brunia continent in a north-directed sub-horizontal channel. This sub-horizontal flow operated between 330 and 325 Ma, and was responsible for a heterogeneous mixing of blocks and boudins of lower and middle crustal rocks and for their progressive thermal re-equilibration. The erosion depth as well as the degree of reworking decreases from south to north, pointing to an outflow of lower crustal material to the surface, which was subsequently eroded and deposited in a foreland basin. Indentation by the Brunia continental promontory was highly noncoaxial with respect to the SE-oriented Saxothuringian continental subduction in the Early Visean, suggesting a major switch of plate configuration during the Middle to Late Visean.
en_US
dc.language.iso
en
en_US
dc.publisher
Wiley-Blackwell
en_US
dc.subject
Bohemian Massif
en_US
dc.subject
Channel flow
en_US
dc.subject
Exhumation
en_US
dc.subject
Orogenic lower crust
en_US
dc.subject
Variscan belt
en_US
dc.title
Vertical extrusion and horizontal channel flow of orogenic lower crust: key exhumation mechanisms in large hot orogens?
en_US
dc.type
Journal Article
dc.date.published
2008-01-24
ethz.journal.title
Journal of Metamorphic Geology
ethz.journal.volume
26
en_US
ethz.journal.issue
2
en_US
ethz.journal.abbreviated
J. metamorph. geol.
ethz.pages.start
273
en_US
ethz.pages.end
297
en_US
ethz.identifier.wos
ethz.publication.place
Oxford
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03592 - Schmidt, Max / Schmidt, Max
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erdwissenschaften / Dep. of Earth Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03592 - Schmidt, Max / Schmidt, Max
ethz.date.deposited
2017-06-10T10:45:25Z
ethz.source
ECIT
ethz.identifier.importid
imp59364ff4296f759550
ethz.ecitpid
pub:92949
ethz.eth
no
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2017-07-15T08:37:16Z
ethz.rosetta.lastUpdated
2022-03-29T10:39:22Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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