Metallogenesis of the French Massif Central: Time-Space Relationships Between Ore Deposition and Tectono-Magmatic Events

Bril, Hubert; Marignac, C.; Cathelineau, M.; Tollon, Francis; Cuney, Michel; Boiron, M.C.

doi:10.1007/978-3-642-84915-2_30

Cited by 11 publications

(5 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are more likely due to the polyphased tectonics that have affected the study area, as examplified by the early Mesozoic reverse motion of the Bar fault ( fig. 1) associated with deposition of Pb-Zn mineralization [Bril et al, 1994].…”

Section: Discussion-conclusionmentioning

confidence: 99%

The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension

Bellot¹,

Roig²,

Genna³

2005

Bulletin De La Société Géologique De France

View full text Add to dashboard Cite

Structural and microstructural analyses of the Argentat fault, combined with sedimentological and structural analyses of the associated Hospital basin allow us to discuss the tectonic control of coal basins by crustal-scale faults during the late Palaeozoic evolution of the Variscan lithosphere in the French Massif Central. The brittle Argentat fault zone consists of first-and second-order strike-slip faults, with dominant NNW-sinistral faults, NNE-dextral or sinistral faults and secondary ENE-dextral faults. Several experimental and theoretical models explain the observed fault patterns, like en echelon faults, A-type secondary faults, conjugate faults and Riedel shears. Strike-slip faulting is responsible for folding of the metamorphic formations characterized by N-S to NE-SW-trending axis. The regional-scale geometry of brittle faults and associated folds corresponds to a positive flower structure centered on the brittle Argentat fault, combined to a negative flower structure centered on the coal basin. Using tectonic inversion software, we show that these structures result from a left-lateral movement of the brittle Argentat fault in relation to a tectonic regime intermediate between extension and strike-slip, with a horizontal NE-SW to NNE-SSW-trending maximum stretching axis. Detailed map and cross-sections, and sedimentological interpretations of the late Stephanian Hospital basin show the occurrence of intra-basin syn-sedimentary strike-slip faults and progressive overlaying, indicating that sedimentation occurs during left-lateral strike-slip faulting and folding of basement along the Argentat fault. These data are consistent with a model of N-S to NE-SW-trending postorogenic extension proposed to account for the late Carboniferous evolution of the Variscan lithosphere. They also point out the complexity and the variety of structures developed along a regional brittle strike-slip fault zone and the necessity to take into account all the structures and the resulting geometry of the basement in order to better constrain the tectonic setting of intra-continental deposits. Le bassin houiller de l'Hospital (Massif central, France) : un relais sur le décrochement senestre d'Argentat associé à l'extension postorogénique de la chaîne varisque Mots clés. -Chaîne varisque, Massif Central, Bassin houiller, Carbonifère supérieur, Tectonique en décrochement, Argentat Résumé. -Les relations géométriques et génétiques entre la faille fragile d'Argentat, accident majeur du Massif central français, et le bassin houiller de l'Hospital le long de laquelle il se localise, apportent des éléments nouveaux sur l'évo-lution de la chaîne varisque au Carbonifère supérieur. Ces relations sont décrites par une étude tectonique et microstructurale de la faille fragile, couplée à une analyse sédimentologique et structurale du bassin houiller. La faille fragile d'Argentat est une zone de cisaillement complexe qui associe plusieurs familles de décrochements de premier et de second ordre. Ces décrochements fragiles, NW senestres, ENE de...

show abstract

Section: Discussion-conclusionmentioning

confidence: 99%

The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension

Bellot¹,

Roig²,

Genna³

2005

Bulletin De La Société Géologique De France

View full text Add to dashboard Cite

show abstract

“…Arsenopyritegold-bearing veins (type v) indicate intermediate temperature according to fluid inclusion study (340-150°C) (Nomade et al 1999). Arsenopyrite-stibnite-bearing veins (also type v) are classically interpreted as witness of low temperature (*100°C) (Bril et al 1994).…”

Section: Description Of Representative Structuresmentioning

confidence: 99%

Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Cévennes area, France)

Chauvet

Volland-Tuduri

Lerouge

et al. 2011

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Geochronological, mineralogical, and geochemical analyses have been focussed on the Mont-Lozère-Borne plutonic complex and surrounding rocks (Cévennes, French Massif Central) in which B-W-Sn and As-Au-Sb mineralization is encountered. Two main results are highlighted: (1) the existence of a 301-306 Ma magmatohydrothermal event unrelated to the emplacement of the Pont-de-Montvert-Borne plutonic body at 316 Ma; (2) the magmatic and hydrothermal features are strongly associated, both in time and in space, thus demonstrating an intimate connection between mineralizing processes and magmatism in this part of the French Massif Central. We also show that mineralization and associated hydrothermal occurrences do not correspond to a simple and single geochemical signature and that a contamination model must be invoked in order to account for the complexity of isotopic results. This study demonstrates that the application of the O and H isotopic signatures as tracers of the source and nature of fluids in an orogenic context requires some specific care. Finally, a model of the tectonic-magmatic-hydrothermal evolution of the study area is suggested in which we discuss two alternative scenarios. The first one implies the existence of two different hydrothermal/ mineralizing events (Bo-W-Sn and As-Au-Sb ones). The second one suggests the same source for all hydrothermal and mineralized structures.

show abstract

“…1). This is also true with the late Variscan deposits in the Massif Central (Périchaud 1980;Bril and Beaufort, 1989;Munoz et al,1992;Bril et al, 1994;Marignac and Cuney, 1999;Bellot et al, 2003), and in Western Europe (Chovan et al, 1998;Wagner and Cook, 2000;Neiva et al, 2008;Nemec and Zacharias, 2018). The Sb deposits might be ascribed to a common genetic model, but the source of the mineralizing fluid remains unknow.…”

Section: Sb Depositsmentioning

confidence: 84%

“…The gold-bearing quartz veins of La Bellière district show many similarities with deep-seated gold deposits of the Massif Central like the Saint-Yrieix or Salsigne districts (Touray et al, 1989;Bonnemaison and Marcoux, 1990;Boiron et al, 1989Boiron et al, , 1990Boiron et al, , 2003Bril et al, 1994;Marignac and Cuney, 1999;Charonnat et al, 1999;Essaraj et al, 2001;Nicaud, 2001;Bouchot et al 2000Bouchot et al , 2005Chauvet et al, 2012). It includes the dominant structural control with strike-slip, ductile/brittle shear zone developed in green-schist facies sedimentary rocks, and a late emplacement of economic ores with high fineness visible gold.…”

Section: Gold Depositsmentioning

confidence: 98%

“…The French Massif Central, which displays the most important gold reserves in France, has been studied since more than thirty years (e.g. Touray et al, 1989;Boiron et al, 1989Boiron et al, , 1990Boiron et al, , 2003Bonnemaison and Marcoux, 1990;Bril et al, 1994;Marignac and Cuney, 1999;Charonnat et al, 1999;Essaraj et al, 2001;Nicaud, 2001;Bouchot et al 2000Bouchot et al , 2005Chauvet et al, 2012). These authors interpreted the formation of gold and Sb-bearing veins as the result of a progressive evolution of a single hydrothermal event in which Sb was formed after the gold stage.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The La Bellière gold and antimony district (French Armorican Massif): A two-stage evolution model controlled by Variscan strike-slip tectonic

Cheval-Garabédian

Faure

Marcoux

et al. 2020

Ore Geology Reviews

View full text Add to dashboard Cite

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

show abstract

Metallogenesis of the French Massif Central: Time-Space Relationships Between Ore Deposition and Tectono-Magmatic Events

Cited by 11 publications

References 55 publications

The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension

The Hospital coal basin (Massif Central, France): relay on the left-lateral strike-slip Argentat fault in relation to the Variscan postorogenic extension

Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Cévennes area, France)

The La Bellière gold and antimony district (French Armorican Massif): A two-stage evolution model controlled by Variscan strike-slip tectonic

Contact Info

Product

Resources

About