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Journal articles on the topic 'Diorite – France – Massif central (France)'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Barbarin, Bernard. "Field evidence for successive mixing and mingling between the Piolard Diorite and the Saint-Julien-la-Vêtre Monzogranite (Nord–Forez, Massif Central, France)." Canadian Journal of Earth Sciences 25, no. 1 (January 1, 1988): 49–59. http://dx.doi.org/10.1139/e88-005.

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Recent mapping of the Nord–Forez region, Massif Central, France, reveals a variety of complex field relationships along contacts between a large enclave of diorite and its enclosing monzogranite. Field relations, hybrid rocks, and a wide variety of mafic magmatic enclaves can be explained by a succession of processes between coexisting mafic and felsic magmas that either prevent or promote exchanges. The large volume of mafic magma, and consequently the large amount of heat it brought with it, favored exchange processes. Because the distribution of heat varied with both time and place, the nature and intensity of the compositional exchange processes also varied.Most of the features attributed to exchange are related to processes that occurred at the level of emplacement and after the beginning of crystallization of the two magmas. These processes affected both the granitic and dioritic magmas already thoroughly hybridized by nearly similar processes that took place earlier at depth.

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2

Dobereiner, Lorenz, Jean-Louis Durville, and Jacques Restitutito. "Weathering of the massiac gneiss (massif central, France)." Bulletin of the International Association of Engineering Geology 47, no. 1 (April 1993): 79–96. http://dx.doi.org/10.1007/bf02639596.

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3

Giusti, Christian. "Asymétrie topographique et morphogénétique dans le sud du Massif central (France) (Topographie and morphogenetic asymmetrv of the Southern Massif Central, France)." Bulletin de l'Association de géographes français 85, no. 2 (2008): 254–70. http://dx.doi.org/10.3406/bagf.2008.2620.

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4

Hugonnot, Vincent. "Bryophytes of the Peatlands of Aubrac (Massif Central - France)." Cryptogamie, Bryologie 32, no. 1 (January 2011): 43–63. http://dx.doi.org/10.7872/cryb.v32.iss1.2011.043.

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5

Zeyen, Hermann, Olaf Novak, Michael Landes, Claus Prodehl, Lynda Driad, and Alfred Hirn. "Refraction-seismic investigations of the northern Massif Central (France)." Tectonophysics 275, no. 1-3 (July 1997): 99–117. http://dx.doi.org/10.1016/s0040-1951(97)00017-6.

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6

Downes, Hilary. "Tertiary and Quaternary volcanism in the Massif Central, France." Geological Society, London, Special Publications 30, no. 1 (1987): 517–30. http://dx.doi.org/10.1144/gsl.sp.1987.030.01.25.

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7

Feijtel, T. C., A. G. Jongmans, N. Van Breemen, and R. Miedema. "Genesis of two Planosols in the Massif Central, France." Geoderma 43, no. 2-3 (December 1988): 249–69. http://dx.doi.org/10.1016/0016-7061(88)90046-8.

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8

Veldkamp, A., and A. G. Jongmans. "Trachytic pumice weathering, Massif Central, France: Geochemistry and micromorphology." Chemical Geology 84, no. 1-4 (July 1990): 145–47. http://dx.doi.org/10.1016/0009-2541(90)90192-a.

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9

Poschmann, Markus, Jason A. Dunlop, Olivier Béthoux, and Jean Galtier. "Carboniferous arachnids from the Graissessac Basin, Central Massif, France." Paläontologische Zeitschrift 90, no. 1 (March 2016): 33–48. http://dx.doi.org/10.1007/s12542-016-0295-7.

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10

Bogdanoff, Serge, Jean-Luc Cirodde, and Maurice Donnot. "The nappes of La Chataigneraie, southwest Massif Central, France." Tectonophysics 157, no. 1-3 (January 1989): 69–79. http://dx.doi.org/10.1016/0040-1951(89)90341-7.

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11

Martin, Philippe. "Approche fractale du karst des Grands Causses, Massif Central, France." Collection EDYTEM. Cahiers de géographie 7, no. 1 (2008): 63–78. http://dx.doi.org/10.3406/edyte.2008.1055.

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12

Lawalree, A. "Une nouvelle variete de Thesium (Santalaceae) du Massif Central (France)." Bulletin du Jardin botanique national de Belgique / Bulletin van de National Plantentuin van België 59, no. 3/4 (December 31, 1989): 467. http://dx.doi.org/10.2307/3668361.

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13

Martin, J.-M., M. Meybeck, V. N. Nijampurkar, and B. L. K. Somayajulu. "210Pb, 226Ra and 32Si in Pavin lake (Massif Central, France)." Chemical Geology 94, no. 3 (March 1992): 173–81. http://dx.doi.org/10.1016/s0009-2541(10)80002-6.

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14

Simon-Coinçon, Régine, Médard Thiry, and Florence Quesnel. "Paléopaysages et paléoenvironnements sidérolithiques du Nord du Massif central (France)." Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science 330, no. 10 (May 2000): 693–700. http://dx.doi.org/10.1016/s1251-8050(00)00189-0.

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15

Vasari, Annicki, and Y. Vasari. "Relic occurence of Betula nana L. in Massif Central, France." Ecologia mediterranea 11, no. 1 (1985): 65–68. http://dx.doi.org/10.3406/ecmed.1985.1073.

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16

Juvigné, Etienne. "Deux retombées volcaniques tardiglaciaires dais le Cézallier (Massif Central, France)." Bulletin de l'Association française pour l'étude du quaternaire 24, no. 4 (1987): 241–49. http://dx.doi.org/10.3406/quate.1987.1853.

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17

Hutchison, R., C. T. Williams, P. Henderson, and S. J. B. Reed. "New varieties of mantle xenolith from the Massif Central, France." Mineralogical Magazine 50, no. 358 (December 1986): 559–65. http://dx.doi.org/10.1180/minmag.1986.050.358.02.

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AbstractSpinel lherzolite xenoliths from two localities in the Massif Central are undepleted in Al2O3, CaO, and Na2O. One suite from Tarreyres, is K2O depleted and amphibole-bearing whereas the other, from Monistrol d'Allier some 18 km away, is amphibole-free and has a higher mean K2O content of 0.035 wt.%. We present bulk major and minor element abundances in a harzburgite and a lherzolite from each locality and microprobe analyses of their constituent phases. Amphibole-bearing lherzolite and its pyroxenes are light-rare earth element (LREE) depleted, whereas amphibole-free lherzolite and its pyroxenes are LREE enriched. Both harzburgites and their pyroxenes are LREE enriched and one rock contains LREE enriched glass. The harzburgites are like harzburgite xenoliths from elsewhere but each lherzolite represents a previously unrecognized type of mantle in terms of the mineralogy and REE content. The implication for basalt genesis are briefly discussed.

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18

Downes, H. "Magma mixing in undersaturated alkaline volcanics, Cantal, Massif Central, France." Mineralogical Magazine 53, no. 369 (March 1989): 43–53. http://dx.doi.org/10.1180/minmag.1989.053.369.04.

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AbstractSeveral examples of magma mixing exist within the undersaturated alkaline magma series of the Tertiary/Quaternary volcanics in the French Massif Central. This study describes magma mixing in the Puy Griou/Griounot area of the Cantal volcano (10-3 Ma). Petrographic evidence for injection of blebs of basic magma into phonolitic host magmas is abundant (cauliform inclusions, liquid-liquid contacts, vesiculation and chilling). Compositions of the inclusions are basic tephrite, whereas the hosts are miaskitic phonolites. Petrographic examination reveals the presence of disequilibrium mineralogical features (e.g. Mg-rich olivine in phonolites) and strong zoning in many clinopyroxenes. Transfer of phenocrysts between basic inclusions and phonolite hosts was common, and can be seen clearly in the wide range of compositions of clinopyroxene. Hornblende, magnetite and olivine were also transferred from inclusions to host.Sr and Nd isotope data indicate that, unlike most other fractionated magmas of the region, phonolites which show evidence for magma mixing are uncontaminated by the continental crust and have isotopic ratios similar to local primitive basic magmas. This leads to the suggestion that the magma mixing event took place at great depth, rather than being a high-level phenomenon. The phonolites were thus generated by high-pressure fractional crystallisation of an earlier basanitic or tephritic parent, perhaps at upper-mantle depths. This conclusion may explain why some phonolites elsewhere in the world have entrained spinel Iherzolite mantle xenoliths.

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19

Merceron, T. "Lithium-Bearing Donbassite and Tosudite from Echassières, Massif Central, France." Clays and Clay Minerals 36, no. 1 (1988): 39–46. http://dx.doi.org/10.1346/ccmn.1988.0360106.

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20

Thébaud, Gilles, Pierre Goubet, Renée Skrzypczak, and Éric Sourp. "Communautés végétales des tourbières ombrotrophes du Massif central oriental (France)." Acta Botanica Gallica 156, no. 3 (January 2009): 341–77. http://dx.doi.org/10.1080/12538078.2009.10516164.

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21

Edel, J. B. "Paleomagnetic evolution of the Central Massif (France) during the Carboniferous." Earth and Planetary Science Letters 82, no. 1-2 (March 1987): 180–92. http://dx.doi.org/10.1016/0012-821x(87)90118-x.

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22

Martins, J.-M., M. Meybecks, V. N. Nijampurkar, and B. L. K. Somayajulu. "210Pb, 226Ra and 32Si in Pavin lake (Massif Central, France)." Chemical Geology: Isotope Geoscience section 94, no. 3 (March 1992): 173–81. http://dx.doi.org/10.1016/0168-9622(92)90010-8.

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23

Chen, Yan, Michel Faure, and Jean Pascal Cogné. "Late Permian palaeomagnetic results from the Brive basin (Massif Central, France)." Tectonophysics 281, no. 3-4 (November 1997): 209–20. http://dx.doi.org/10.1016/s0040-1951(97)00043-7.

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24

Elmi, Serge, and Louis Rulleau. "Le Jurassique du Beaujolais méridional, bordure orientale du Massif Central, France." Geobios 26 (January 1993): 139–55. http://dx.doi.org/10.1016/s0016-6995(06)80368-2.

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25

Uenver-Thiele, Laura, Alan B. Woodland, Hilary Downes, and Rainer Altherr. "Oxidation State of the Lithospheric Mantle below the Massif Central, France." Journal of Petrology 55, no. 12 (December 2014): 2457–80. http://dx.doi.org/10.1093/petrology/egu063.

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26

Francez, André-Jean, and Jean Dévaux. "Répartition des rotifères dans deux lacs-tourbières du Massif Central (France)." Hydrobiologia 128, no. 3 (September 1985): 265–76. http://dx.doi.org/10.1007/bf00006823.

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27

Pastre, Jean François, and Jean Marie Cantagrel. "Téphrostratigraphie du Mont Dore / The Mont Dore tephrostratigraphy (Massif Central, France)." Quaternaire 12, no. 4 (2001): 249–67. http://dx.doi.org/10.3406/quate.2001.1697.

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28

Merceron, Thierry, Philippe Vieillard, Anne-Marie Fouillac, and Alain Meunier. "Hydrothermal alterations in the Echassi�res granitic cupola (Massif central, france)." Contributions to Mineralogy and Petrology 112, no. 2-3 (November 1992): 279–92. http://dx.doi.org/10.1007/bf00310461.

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29

Matthews, A., C. Fouillac, R. Hill, R. K. O'Nions, and E. R. Oxburgh. "Mantle-derived volatiles in continental crust: the Massif Central of France." Earth and Planetary Science Letters 85, no. 1-3 (September 1987): 117–28. http://dx.doi.org/10.1016/0012-821x(87)90026-4.

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30

de Beaulieu, J. L., and M. Reille. "Long Pleistocene pollen sequences from the Velay Plateau (Massif Central, France)." Vegetation History and Archaeobotany 1, no. 4 (December 1992): 233–42. http://dx.doi.org/10.1007/bf00189500.

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31

Freytet, Pierre, Marie-Luce Lebreton, and Yves Paquette. "The carbonates of the Permian Lakes of North Massif central, France." Carbonates and Evaporites 7, no. 2 (September 1992): 122–31. http://dx.doi.org/10.1007/bf03175626.

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32

Ramananantoandro, R. "Seismic evidence for mantle flow beneath the Massif Central rift zone (France)." Canadian Journal of Earth Sciences 25, no. 12 (December 1, 1988): 2139–42. http://dx.doi.org/10.1139/e88-197.

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The elastic-wave velocities in three spinel lherzolite xenoliths from the Massif Central rift zone (France) indicate that the high field seismic velocity (8.4 km/s) found parallel to the rift, at a depth of 40 km in the upper mantle beneath the Massif Central, can only be explained by a preferred orientation of the olivine a axis parallel to the rift. This is not predicted by two-dimensional models of mantle flow beneath a rift. Horizontal asthenospheric flow in lithospheric fractures associated with rifting would explain the olivine orientation and the high upper mantle velocity parallel to the rift axis.

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33

Dallmeyer, R. D., R. A. Strachan, and R. S. D'Lemos. "Chronology of Cadomian tectonothermal activity in the baie de Saint-Brieuc (north Brittany), France: evidence from 40Ar/39Ar mineral ages." Canadian Journal of Earth Sciences 28, no. 5 (May 1, 1991): 762–73. http://dx.doi.org/10.1139/e91-066.

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The late Precambrian Cadomian Orogen exposed in the North Armorican Massif (northwest France) is a collage of displaced terranes that, in part, developed during amalgamation of continental-arc and marginal-basin complexes. 40Ar/39Ar mineral ages reported here place new constraints on the timing of Cadomian tectonothermal activity in the southern part of the St Brieuc terrane. In the baie de Saint-Brieuc area Brioverian supracrustal units were deformed, metamorphosed, and intruded by calc-alkaline plutonic complexes. Metamorphic hornblende from a metabasic amphibolite sheet within Brioverian rocks records an isotope correlation age of 568.4 ± 2.6 Ma (interpreted to date postmetamorphic cooling through appropriate argon closure temperatures). Similar isotope correlation cooling ages are recorded by metamorphic hornblende within both an amphibolite sheet intrusive into the Penthièvre complex (567.5 ± 1.2 Ma) and the La Croix Gibat amphibolite (574.8 ± 2.1 Ma). Igneous hornblende from the late tectonic to posttectonic St Quay quartz diorite and muscovite from Brioverian metasedimentary rocks in the contact aureole record isotope correlation ages of ca. 565–570 Ma. These and a ca. 568 Ma isotope correlation age determined for hornblende from the foliated Fort de la Latte quartz diorite are interpreted to date postmagmatic cooling.The 40Ar/39Ar ages indicate that Cadomian tectonothermal activity within southern parts of the St Brieuc terrane occurred prior to ca. 570 Ma. This is markedly older than the ca. 540 Ma date previously suggested for peak Cadomian metamorphism and granite emplacement in the adjacent St Malo terrane and is consistent with palinspastic separation of the contrasting Cadomian elements until at least the latest Precambrian. A pre-570 Ma age for Cadomian tectonothermal activity in the St Brieuc terrane suggests correlation with similar-aged orogenic activity in other circum-Atlantic, late Precambrian Gondwanan marginal terranes (including southern portions of the Iberian massif and various sectors of the West African orogens).

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34

Vanardois, Jonas, Pierre Trap, Philippe Goncalves, Didier Marquer, Josselin Gremmel, Guillaume Siron, and Thierry Baudin. "Kinematics, deformation partitioning and late Variscan magmatism in the Agly massif, Eastern Pyrenees, France." BSGF - Earth Sciences Bulletin 191 (2020): 15. http://dx.doi.org/10.1051/bsgf/2020009.

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In order to constrain the finite deformation pattern of the Variscan basement of the Agly massif, a detailed structural analysis over the whole Agly massif was performed. Our investigation combined geological mapping, reappraisal of published and unpublished data completed with our own structural work. Results are provided in the form of new tectonic maps and series of regional cross-sections through the Agly massif. At variance from previous studies, we identified three deformation fabrics named D1, D2 and D3. The D1 deformation is only relictual and characterized by a broadly northwest-southeast striking and eastward dipping foliation without any clear mineral and stretching lineation direction. D1 might be attributed to thickening of the Variscan crust in a possible orogenic plateau edge position. The D2 deformation is a heterogeneous non-coaxial deformation, affecting the whole massif, that produced a shallowly dipping S2 foliation, and an anastomosed network of C2 shear zones that accommodated vertical thinning and N20 directed extension. D2 is coeval with LP-HT metamorphism and plutonism at ca. 315–295 Ma. D2 corresponds to the extensional collapse of the partially molten orogenic crust in a global dextral strike-slip at the scale of the whole Variscan belt. The D2 fabrics are folded and steepened along a D3 east-west trending corridor, called Tournefort Deformation Zone (TDZ), where the Saint-Arnac and Tournefort intrusives and surrounding rocks share the same NE-SW to E-W subvertical S3 foliation. Along the D3 corridor, the asymmetrical schistosity pattern and kinematic criteria suggest a D3 dextral kinematics. The D3 deformation is a record of E-W striking dextral shearing that facilitated and localized the ascent and emplacement of the diorite and granitic sheet-shaped plutons. D3 outlasted D2 and turned compressional-dominated in response to the closure of the Ibero-Armorican arc in a transpressional regime. The progressive switch from D2 thinning to D3 transpression is attributed to the lessening of gravitational forces at an advanced stage of extensional collapse that became overcome by ongoing compressional tectonic forces at the southern edge of the Variscan orogenic plateau.

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35

Larue, Jean-Pierre. "Tectonical and morphodynamical evolution of the southern Massif Central border, between the Cesse and Hérault rivers (France)." Bulletin de la Société Géologique de France 175, no. 6 (November 1, 2004): 547–60. http://dx.doi.org/10.2113/175.6.547.

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Abstract Despite numerous researches concerning the Massif Central southern border, there are no certainties about the number and the chronology of the erosion surfaces, the uplift stages of the Massif Central and the incision stages of the rivers. Located on the Massif Central basement and on the Languedocian piedmont, the Orb, Libron and Hérault tributaries basins show a good pattern of shapes and formations, from the Caroux to the littoral plain. Geomorphological and sedimentological study brings some new insights to these questions. Heavy minerals analysis allows us to separate different formations among the deposits located on the erosion surfaces and in the valleys. It is used to reconstruct the main sedimentary pathways. North-south fluxes crossed the Avant-Monts up to the Upper Pliocene, despite of the Miocene uplift. Upper Pliocene uplift of the Avant-Monts caused the bifurcation of the Orb towards the west, the antecedent incision between the Jaur confluence and Cessenon and the stepped pediments and glacis on the Avant-Monts southern border. The longitudinal paleoprofiles argue for a progressive uplift of the Massif Central since the Messinian unconformity. Incision of the valleys began before the Messinian in the Massif Central, but only during the Lower Pleistocene in the Languedocian piedmont.

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36

Hugonnot, Vincent, Jaoua Celle, and Thierry Vergne. "Bryophytes Hyperocéaniques dans les Vallons du Sud-Ouest du Massif Central (France)." Cryptogamie, Bryologie 34, no. 3 (July 2013): 325–39. http://dx.doi.org/10.7872/cryb.v34.iss3.2013.325.

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37

Delaunay, Lionel. "Meira mellei n. sp. du mont Tanargue, Massif central, France (Coleoptera Curculionidae)." Bulletin mensuel de la Société linnéenne de Lyon 80, no. 5 (2011): 113–18. http://dx.doi.org/10.3406/linly.2011.12683.

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38

Bruce, S. "The Genesis of Mineralising Brines in the South West Massif Central, France." Mineralogical Magazine 62A, no. 1 (1998): 238–39. http://dx.doi.org/10.1180/minmag.1998.62a.1.126.

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39

Briand, Bernard, Jean-Luc Bouchardon, Houssa Ouali, Michel Piboule, and Paul Capiez. "Geochemistry of bimodal amphibolitic—felsic gneiss complexes from eastern Massif Central, France." Geological Magazine 132, no. 3 (May 1995): 321–37. http://dx.doi.org/10.1017/s0016756800013637.

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AbstractHigh-grade basic and acidic meta-igneous rocks are widespread in the bimodal amphibolitic—felsic gneiss complexes, which are characteristic formations of the ‘Middle Allochthonous Unit’ from eastern and southern French Massif Central. The metabasites from the Lyonnais and Doux complexes are chemically diverse and range from N-MORB type tholeiitic to transitional types. The two populations are not related by fractional crystallization or crustal contamination processes and their chemical characteristics reflect differences in their mantle sources. An ensialic setting is supported by the crustally-derived character of some of the associated felsic rocks, but the presence of N-MORB-type metabasites argues for an extensional environment. This bimodal association compares well with the magmatism of rifted continental margins and may reflect a transitional stage between continental rifting and oceanic crust formation during the Cambro-Ordovician spreading event.

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40

Monnier, Loïs, Stefano Salvi, Jérémie Melleton, Laurent Bailly, Didier Béziat, Philippe de Parseval, Sophie Gouy, and Philippe Lach. "Multiple Generations of Wolframite Mineralization in the Echassieres District (Massif Central, France)." Minerals 9, no. 10 (October 17, 2019): 637. http://dx.doi.org/10.3390/min9100637.

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The Echassières district in central France contains complex rare-element ore deposits, whose formation is related to exotic igneous events and several hydrothermal episodes that are not entirely understood to date. Tungsten mineralization consists of three generations of wolframite, characterized by distinct Fe/Mn ratios (8.4; 3.5 and 0.3, for wolframite a, b and c, respectively), formed during three separate hydrothermal episodes related to the Variscan orogeny. Wolframite a occurs in quartz veins of the La Bosse stockwork where it crystallized before the Barrovian metamorphism that affected these veins and the host rock. After metamorphism, before intrusion of the Beauvoir and Colettes granites, wolframite b crystallized in the stockwork during massive topazification. High concentrations of wolframite c occur in the proximal quartz veins in the Mazet area, while only scant amounts are found in the La Bosse stockwork. In both settings, wolframite c precipitated from the fluid responsible for greisen alteration that massively affected the Beauvoir granite. In the La Bosse stockwork, greisen alteration is characterized by hydrothermal topaz that is texturally and chemically distinct from that precipitated during topazification. Supergene alteration responsible for kaolinization of Beauvoir and Colettes granites caused remobilization of a non-negligible amount of tungsten (W) during replacement of wolframite by W-rich goethite in all units of the Echassières district. This model for multiple W mineralizing events is novel and can prove essential in distinguishing potential economic deposits worldwide.

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41

Schaminée, Joop H. J., Caroline Coolen, and Marian B. Siebum. "The vegetation of 'snowbeds' in the Monts du Forez (Massif Central, France)." Phytocoenologia 21, no. 1-2 (October 27, 1992): 175–206. http://dx.doi.org/10.1127/phyto/21/1992/175.

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42

Granet, M., G. Stoll, J. Dorel, U. Achauer, G. Poupinet, and K. Fuchs. "Massif Central (France): new constraints on the geodynamical evolution from teleseismic tomography." Geophysical Journal International 121, no. 1 (April 1995): 33–48. http://dx.doi.org/10.1111/j.1365-246x.1995.tb03509.x.

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43

Mies, Bruno A. "New or Interesting Lichens from the Limousin Region (Western Massif Central, France)." Herzogia 28, no. 2 (November 2015): 473–783. http://dx.doi.org/10.13158/heia.28.2.2015.473.

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44

Downes, Hilary, and Claude Dupuy. "Textural, isotopic and REE variations in spinel peridotite xenoliths, Massif Central, France." Earth and Planetary Science Letters 82, no. 1-2 (March 1987): 121–35. http://dx.doi.org/10.1016/0012-821x(87)90112-9.

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45

Fowler, Peter. "A limestone landscape from the air: le Causse Méjean, Languedoc, France." Antiquity 73, no. 280 (June 1999): 411–19. http://dx.doi.org/10.1017/s0003598x00088359.

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Reconnaissance on the southern edge of the Massif Central is studying field evidence which deepens appreciation of the present-day upland French landscape as not only ‘sauvage’ but also the product of long-term use.

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46

Gebelin, Aude, Guillaume Martelet, Maurice Brunel, Michel Faure, and Philippe Rossi. "Late Hercynian leucogranites modelling as deduced from new gravity data : the example of the Millevaches massif (Massif Central, France)." Bulletin de la Société Géologique de France 175, no. 3 (May 1, 2004): 239–48. http://dx.doi.org/10.2113/175.3.239.

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Abstract The Millevaches granitic complex, located in the northern part of the French Massif Central, is elongated in a N-S direction, perpendicular to the main E-W trend of the Hercynian belt. It is affected on its limits and in its core by several ductile shear zones that have necessarily played a great role in the emplacement and exhumation of the massif. Based on gravity modelling and recent field observations, this study intends to highlight the massif structure at depth and discuss its mode of emplacement and relations with the surrounding terrains. The new gravity and density measurements on the north-east part of the Millevaches massif improve the gravity coverage of the northern Limousin. Using these new data we model the deep structure of the Millevaches plateau. The density measurements made on the different types of granites of the massif, and on the surrounding terrains improve the interpretation of the Bouguer anomaly. Analysis and inversion of the residual Bouguer anomaly in the area show that the Millevaches massif is 2 to 4 km-thick, from north to south and from west to east, locally rooting down to about 6 km deep in its eastern and southern terminations. These two zones coincide with porphyritic plutons and, because of the complex composite structure of the massif, cannot be definitively interpreted as feeding zones. In the field, the N-S-oriented Pradines vertical fault affects the core of the massif on 4 to 5 km width. Microstructural observations evidence that the faulting is contemporaneous of the granites emplacement. We suggest that this tectonic lineament could have triggered the migration of the magma, although it is not related to a clear gravity anomaly. AMS measurements in the north-central part of the Millevaches massif suggest that the magnetic foliation and lineation display a general sub-horizontal pattern. Moreover, on the western border of the Millevaches massif, the Argentat deep seismic profile shows sub-horizontal layering of gneisses and micaschists and evidences normal faulting offset of this layering along Argentat fault. This agrees fairly well with the gravity results, suggesting that (i) the Millevaches massif would be at a high structural level in the crust, (ii) the exhumation of the massif would have been favoured along the Argentat normal fault. As a whole, the massif can be described as a laccolith, 2 to 4 km-thick, emplaced as a “magmatic lens” into the sub-horizontally foliated gneisses and micaschists.

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MERCERON, Thierry. "Genesis of Li-donbassite and tosudite in Echassieres granitic cupola, Massif Central, France." Journal of the Mineralogical Society of Japan 19 (1990): 113–19. http://dx.doi.org/10.2465/gkk1952.19.special_113.

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Delaigue, Jacques. "Circaea x intermedia Ehrh. (Onagracées) dans la bordure est du Massif central (France)." Bulletin mensuel de la Société linnéenne de Lyon 78, no. 3 (2009): 49–51. http://dx.doi.org/10.3406/linly.2009.13712.

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Larue, Jean-Pierre. "Tectonique, érosion et hydrographie sur la bordure nord-ouest du Massif central (France)." Géomorphologie : relief, processus, environnement 11, no. 4 (December 31, 2005): 275–96. http://dx.doi.org/10.4000/geomorphologie.499.

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Downes, H., A. Shaw, B. J. Williamson, and M. F. Thirlwall. "Sr, Nd al36 (1997) 99–122 Hercynian granodiorites and monzogranites, Massif Central, France." Chemical Geology 136, no. 1-2 (March 1997): 99–122. http://dx.doi.org/10.1016/s0009-2541(96)00141-6.

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