dc.contributor.author | Schulz, Bernhard | |
dc.contributor.author | Krenn, Erwin | |
dc.contributor.author | Finger, Fritz | |
dc.contributor.author | Brätz, Helene | |
dc.contributor.author | Klemd, Reiner | |
dc.contributor.editor | Philipp, Sonja | |
dc.contributor.editor | Leiss, Bernd | |
dc.contributor.editor | Vollbrecht, Axel | |
dc.contributor.editor | Tanner, David | |
dc.contributor.editor | Gudmundsson, Agust | |
dc.date.accessioned | 2010-11-26T13:21:33Z | |
dc.date.accessioned | 2013-01-28T10:20:31Z | |
dc.date.available | 2010-11-26T13:21:33Z | |
dc.date.available | 2013-01-28T10:20:31Z | |
dc.date.issued | 2006-03 | |
dc.identifier.citation | Philipp, S.; Leiss, B; Vollbrecht, A.; Tanner, D.; Gudmundsson, A. (eds.): 11. Symposium "Tektonik, Struktur- und Kristallingeologie"; 2006, Univ.-Verl. Göttingen, p. 203 - 205. | |
dc.identifier.isbn | 3-938616-40-7 | |
dc.identifier.uri | http://hdl.handle.net/11858/00-1735-0000-0001-3473-6 | |
dc.description.abstract | The question, whether crustal domains
are allochthonous terranes or not is
crucial for plate tectonic models of
the Ibero-Armorican segment of the
Variscan belt. The Léon Domain in
the Armorican Massif appears as a displaced
crustal block as it bears a resemblance
to the South Armorican Domain
of the internal Variscan belt (Le Corre
et al. 1989). In the central part of the
Léon, the amphibolite-facies Conquet-
Penze Micaschist Unit (CPMU) overlies
the high-grade Lesneven Gneiss Unit
(LGU). At the base of the LGU, a
high-pressure stage at 700°C/>13 kbar,
recorded by garnet-clinopyroxene assemblages
in eclogites was followed by a
high-temperature event at 800°C/8 kbar
with garnet and cordierite in aluminous
paragneisses. Maximal temperatures in
the upper parts of the LGU were
630°C/6 kbar. In the micaschists of
the Conquet-Penze Unit, microstructures
indicate a crystallization of garnet
and then staurolite during the development
of S1 and S2 foliations. Zoned
garnet in assemblages with staurolite
recorded prograde P–T paths from 490–
610°C at 5–8 kbar in the upper and at 6–
9 kbar in the lower parts of the CPMU. The foliation S2 was overprinted by shear bands with a top-to-
SW directed normal sense of shear, corresponding
to a dextral strike-slip movement
(Balé & Brun 1986).
A younger population of monazite with
variable Y contents displays Variscan
Th-U-Pb ages (EMP dating method)
between 340 and 300Ma. In
contrast, an older population of Cadomian
monazite at 552–517Ma is uniformly
rich in Y and was observed in
samples with only few or even no garnet.
As the 330–340Ma Saint Renan-
Kersaint granite postdates the foliations
S1 and S2 with peak metamorphic
assemblages one can conclude that
340–300Ma Variscan monazites should
postdate garnet crystallization. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | deu | |
dc.publisher | Universitätsverlag Göttingen | |
dc.relation.ispartof | 11. Symposium "Tektonik, Struktur- und Kristallingeologie" | |
dc.subject.ddc | 551 | |
dc.subject.gok | VEC 130 | |
dc.subject.gok | VKB 292 | |
dc.subject.gok | VHC 200 | |
dc.subject.gok | VBN 500 | |
dc.subject.gok | VJJ 310 | |
dc.subject.gok | VGC 300 | |
dc.title | Cadomian and Variscan metamorphic events in the Léon Domain (Armorican Massif) resolved by trace element analysis in monazite and garnet | |
dc.type | anthologyArticle | |
dc.subject.gokverbal | Amorikanisches Massiv und Randzonen {Geologie} | |
dc.subject.gokverbal | Metamorphe Komplexe, übriges Europa {Petrologie} | |
dc.subject.gokverbal | Schwerminerale | |
dc.subject.gokverbal | Geochronologie einzelner Regionen im allgemeinen | |
dc.subject.gokverbal | Lanthanoiden Lanthaniden, Seltene Erden {Geochemie} | |
dc.subject.gokverbal | Analysedaten von Mineralen und Mineralparagenesen | |
dc.bibliographicCitation.firstPage | 203 | |
dc.bibliographicCitation.lastPage | 205 | |
dc.identifier.doi | 10.23689/fidgeo-1896 | |
dc.type.version | publishedVersion | |
dc.subject.free | Armorikanisches Gebirge | |
dc.subject.free | Variskische Gebirgsbildung | |
dc.subject.free | Assyntische Faltungsphase | |
dc.subject.free | Metamorphose <Geologie> | |
dc.subject.free | Monazit | |
dc.subject.free | Geochronologie | |
dc.relation.collection | Geologische Wissenschaften | |
dc.description.type | conference | |