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Article: The Montagne Noire migmatitic dome emplacement (French Massif Central): new insights from petrofabric and AMS studies

TitleThe Montagne Noire migmatitic dome emplacement (French Massif Central): new insights from petrofabric and AMS studies
Authors
KeywordsAms
Diapirism
Migmatitic Dome
Montagne Noire
Petrofabric
Variscan Belt
Issue Date2009
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jsg
Citation
Journal of Structural Geology, 2009, v. 31 n. 11, p. 1423-1440 How to Cite?
AbstractIn the southern French Massif Central, the Montagne Noire axial zone is a NE-SW elongated granite-migmatite dome emplaced within Visean south-verging recumbent folds and intruded by syn- to late-migmatization granitoids. The tectonic setting of this dome is still disputed, thus several models have been proposed. In order to better understand the emplacement mechanism of this dome, petrofabric and Anisotropy of Magnetic Susceptibility (AMS) studies have been carried out. In the granites and migmatites that form the dome core, magmatic texture and to a lesser extent weak solid-state texture are dominant. As a paramagnetic mineral, biotite is the main carrier of the magnetic susceptibility. On the basis of 135 AMS sites, the magnetic fabrics appear as independent of the lithology but related to the dome architecture. Coupling our results with previous structural and geochronological studies, allows us to propose a new emplacement model. Between 340-325 Ma, the Palaeozoic series underwent a compressional deformation represented by nappes and recumbent folds involving the thermal event leading to partial melting. Until ∼325-310 Ma, the dome emplacement was assisted by diapiric processes. An extensional event took place at ∼300 Ma, after the emplacement of the late to post-migmatitic granitic plutons. In the northeast side of the dome, a brittle normal-dextral faulting controlled the opening of the Graissessac coal basin. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/92151
ISSN
2015 Impact Factor: 2.084
2015 SCImago Journal Rankings: 1.648
ISI Accession Number ID
Funding AgencyGrant Number
BRGM (French Geological Survey)
Funding Information:

This work is a contribution to the "Programme de la Carte Goologique de la France au 1/50 000" Castres sheet, and its explanatory notes. The BRGM (French Geological Survey) is thanked for the financial support. AMS measurements were partly carried out at the Institut de Physique du Globe de Paris (Saint-Maur). We thank Dr. Jackson, Dr. Borradaile and anonymous reviewer for their constructive suggestions to improve our manuscript.

References

 

DC FieldValueLanguage
dc.contributor.authorCharles, Nen_HK
dc.contributor.authorFaure, Men_HK
dc.contributor.authorChen, Yen_HK
dc.date.accessioned2010-09-17T10:37:35Z-
dc.date.available2010-09-17T10:37:35Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal of Structural Geology, 2009, v. 31 n. 11, p. 1423-1440en_HK
dc.identifier.issn0191-8141en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92151-
dc.description.abstractIn the southern French Massif Central, the Montagne Noire axial zone is a NE-SW elongated granite-migmatite dome emplaced within Visean south-verging recumbent folds and intruded by syn- to late-migmatization granitoids. The tectonic setting of this dome is still disputed, thus several models have been proposed. In order to better understand the emplacement mechanism of this dome, petrofabric and Anisotropy of Magnetic Susceptibility (AMS) studies have been carried out. In the granites and migmatites that form the dome core, magmatic texture and to a lesser extent weak solid-state texture are dominant. As a paramagnetic mineral, biotite is the main carrier of the magnetic susceptibility. On the basis of 135 AMS sites, the magnetic fabrics appear as independent of the lithology but related to the dome architecture. Coupling our results with previous structural and geochronological studies, allows us to propose a new emplacement model. Between 340-325 Ma, the Palaeozoic series underwent a compressional deformation represented by nappes and recumbent folds involving the thermal event leading to partial melting. Until ∼325-310 Ma, the dome emplacement was assisted by diapiric processes. An extensional event took place at ∼300 Ma, after the emplacement of the late to post-migmatitic granitic plutons. In the northeast side of the dome, a brittle normal-dextral faulting controlled the opening of the Graissessac coal basin. © 2009 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jsgen_HK
dc.relation.ispartofJournal of Structural Geologyen_HK
dc.subjectAmsen_HK
dc.subjectDiapirismen_HK
dc.subjectMigmatitic Domeen_HK
dc.subjectMontagne Noireen_HK
dc.subjectPetrofabricen_HK
dc.subjectVariscan Belten_HK
dc.titleThe Montagne Noire migmatitic dome emplacement (French Massif Central): new insights from petrofabric and AMS studiesen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jsg.2009.08.007en_HK
dc.identifier.scopuseid_2-s2.0-70449529308en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70449529308&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume31en_HK
dc.identifier.issue11en_HK
dc.identifier.spage1423en_HK
dc.identifier.epage1440en_HK
dc.identifier.isiWOS:000272640400012-
dc.identifier.citeulike5658383-

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