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Article: Gravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central

TitleGravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Central
Authors
Keywords3D Modelling
Anisotropy Of Magnetic Susceptibility (Ams)
Granite Fabrics
Gravity Investigations And Inversion
Monazite Chemical U-Th-Pb Dating
Sillon Houiller Fault
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. 4, p. 421-443 How to Cite?
AbstractMagnetic fabric analyses, gravity inversion associated with chemical U-Th-Pb dating and structural observations are carried out to elucidate relationships between faulting and magmatic processes. This multidisciplinary study has been undertaken on Late Carboniferous plutons, situated in the southern part of the Variscan French Massif Central (FMC). The Glénat, Omps and Boisset plutons crop out on both sides of the crustal-scale Sillon Houiller Fault (SHF). The Anisotropy of Magnetic Susceptibility (AMS) measurements and structural observations show that (i) the plutons acquired their final structure during the magma crystallization and record a NW-SE maximum stretching trend; (ii) in the Boisset pluton, post-magmatic fabrics predominate with a NNW-SSE trending lineation. The structural pattern deduced from the AMS study is thus consistent with the NW-SE late orogenic extensional tectonic regime that has been documented in other parts of the FMC during Late Carboniferous. The 3D geological modelling refined by 3D gravity inversion does not show any evidence of rooting of the granites along the SHF. Therefore, despite the apparent cartographic relationship between the SHF and the three plutons, our study does not support a genetic link between fault and plutons. It also questions the existence of the SHF in this part of the Massif Central at the time of pluton emplacement, and emphasises the dominant role of the regional tectonic framework rather than local faulting as a factor controlling pluton emplacement. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/92223
ISSN
2015 Impact Factor: 2.084
2015 SCImago Journal Rankings: 1.648
ISI Accession Number ID
Funding AgencyGrant Number
3D Geomodeller team
Intrepid Geophysics team
Funding Information:

We are grateful to M. Diament for providing us with a SCINTREX CG3-M micro-gravimeter. The 3D Geomodeller team: Antonio Guillen, Gabriel Courrioux, Philippe Calcagno and Intrepid Geophysics team are acknowledged for their support. Geophysical maps were drawn using Geosoft software. J.Y. Roig and J.L. Feybesse are thanked for fruitful discussions. The positive and insightful comments provided by both reviewers F. Hrouda and G. Borradaille are gratefully acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorJoly, Aen_HK
dc.contributor.authorFaure, Men_HK
dc.contributor.authorMartelet, Gen_HK
dc.contributor.authorChen, Yen_HK
dc.date.accessioned2010-09-17T10:39:42Z-
dc.date.available2010-09-17T10:39:42Z-
dc.date.issued2009en_HK
dc.identifier.citationJournal of Structural Geology, 2009, v. 31 n. 4, p. 421-443en_HK
dc.identifier.issn0191-8141en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92223-
dc.description.abstractMagnetic fabric analyses, gravity inversion associated with chemical U-Th-Pb dating and structural observations are carried out to elucidate relationships between faulting and magmatic processes. This multidisciplinary study has been undertaken on Late Carboniferous plutons, situated in the southern part of the Variscan French Massif Central (FMC). The Glénat, Omps and Boisset plutons crop out on both sides of the crustal-scale Sillon Houiller Fault (SHF). The Anisotropy of Magnetic Susceptibility (AMS) measurements and structural observations show that (i) the plutons acquired their final structure during the magma crystallization and record a NW-SE maximum stretching trend; (ii) in the Boisset pluton, post-magmatic fabrics predominate with a NNW-SSE trending lineation. The structural pattern deduced from the AMS study is thus consistent with the NW-SE late orogenic extensional tectonic regime that has been documented in other parts of the FMC during Late Carboniferous. The 3D geological modelling refined by 3D gravity inversion does not show any evidence of rooting of the granites along the SHF. Therefore, despite the apparent cartographic relationship between the SHF and the three plutons, our study does not support a genetic link between fault and plutons. It also questions the existence of the SHF in this part of the Massif Central at the time of pluton emplacement, and emphasises the dominant role of the regional tectonic framework rather than local faulting as a factor controlling pluton emplacement. © 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.subject3D Modellingen_HK
dc.subjectAnisotropy Of Magnetic Susceptibility (Ams)en_HK
dc.subjectGranite Fabricsen_HK
dc.subjectGravity Investigations And Inversionen_HK
dc.subjectMonazite Chemical U-Th-Pb Datingen_HK
dc.subjectSillon Houiller Faulten_HK
dc.subjectVariscan Belten_HK
dc.titleGravity inversion, AMS and geochronological investigations of syntectonic granitic plutons in the southern part of the Variscan French Massif Centralen_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.2009.01.004en_HK
dc.identifier.scopuseid_2-s2.0-64449083215en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-64449083215&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume31en_HK
dc.identifier.issue4en_HK
dc.identifier.spage421en_HK
dc.identifier.epage443en_HK
dc.identifier.isiWOS:000266057800007-

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