Log in

Relevant bibliographies by topics / Amphibolite – France – Massif central (France) / Journal articles

To see the other types of publications on this topic, follow the link: Amphibolite – France – Massif central (France).

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

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Amphibolite – France – Massif central (France).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

2

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

3

Oliot, Emilien, Jérémie Melleton, Julie Schneider, Michel Corsini, Véronique Gardien, and Yann Rolland. "Variscan crustal thickening in the Maures-Tanneron massif (South Variscan belt, France): new in situ monazite U-Th-Pb chemical dating of high-grade rocks." Bulletin de la Société Géologique de France 186, no. 2-3 (2015): 145–69. http://dx.doi.org/10.2113/gssgfbull.186.2-3.145.

Full text

Abstract:

AbstractAge constraints on the protoliths, deformation, metamorphism and melting events are key parameters when correlating different continental lithospheric remnants among each other and disentangling their evolution within large-scale orogens. In situ U-Th-Pb chemical dating on monazites using Electron Probe Micro-Analyser (EPMA) has been performed on eight samples throughout the Variscan Maures-Tanneron massif (SE France) in order to date the medium to high-tectonothermal events related to the Variscan orogeny.Results indicate a polyphased crustal evolution : (i) U-Th-Pb ages obtained in polygenetic monazite grain cores gave inherited Upper Ordovician (456 ± 11 Ma) age, highlighting the large scale occurrence of the Ordovician magmatic activity in the North Gondwanian margin. An Early Devonian (404 ± 10 Ma) age may date a protolith emplacement related to calc-alkaline supra-subduction magmatism or could be associated to an early medium-grade metamorphism, prior to collisional stage. (ii) The crustal thickening stage has been further recorded in prograde metamorphic monazites formed during the underthrusting and subsequent nappe stacking events, under amphibolite facies conditions. This stage is dated between 382 ± 11 (Middle Devonian) and 331 ± 5 Ma (Late Visean). (iii) An orogenic partial melting event took place during Middle Carboniferous and is accompanied by the crystallization of crustal peraluminous magmas (Plan-de-la-Tour granite, 329 ± 3 Ma).This contribution demonstrates the capacity of monazite to record the prograde path of rocks during increasing metamorphic conditions related to stages of crustal thickening, and the robustness of the U-Th-Pb chronometer in monazite despite the overprinting of high-grade thermal events, including partial melting. The age ranges of the different orogenic stages reported in this study are in good agreement with those reported in adjacent Variscan Corsica and Sardinia; while correlations with other nearest Variscan massifs like the Argentera massif in the southwestern Alps or the French Massif Central remain more hypothetic. The Internal Zone of the Maures-Tanneron massif, and more widely the Internal Zone of the Maures-Tanneron-Corsica-Sardinia segment, is part of the southern orogenic root system of the Variscan belt.

APA, Harvard, Vancouver, ISO, and other styles

4

Misseri, Maxime, and Didier Lahondere. "Characterisation of chemically related asbestos amphiboles of actinolite: proposal for a specific differentiation in the diagram (Si apfu versus Mg/Mg+Fe2+)." International Journal of Metrology and Quality Engineering 9 (2018): 16. http://dx.doi.org/10.1051/ijmqe/2018014.

Full text

Abstract:

Aggregates and rocks from quarries located in metropolitan France and New Caledonia, all likely to contain asbestiform amphiboles, were analysed by a routine laboratory (AD-LAB). Morphological observations were made using transmission electron microscopy and chemical analyses were obtained with energy dispersive X-ray spectroscopy. The chemical analyses obtained from amphiboles were treated in such a way that they could be plotted in a diagram (Si apfu versus Mg/Mg+Fe2+). The points corresponding to analysed particles, classified as asbestos, define a broader compositional domain than that corresponding to the compositional areas of actinolite and tremolite. The creation of two new domains is proposed. Samples of basic metavolcanics and amphibolites collected by the Geological and Mining Research Bureau (BRGM) in different quarries of the Armorican Massif and the Massif Central containing calcic amphibole fibres have been the subject of polarized light microscope and electron microprobe analyses. The representative points of the spot chemical analyses performed on the very fine and ultrafine fibres are contained in the range defined previously. The diagram that has been determined from chemical analyses coupled with morphological and dimensional observations can help the “routine laboratories” to better characterise asbestiform calcic amphiboles, but it also allows comparisons with geological observations.

APA, Harvard, Vancouver, ISO, and other styles

5

Bellot, Jean-Philippe. "SHEAR ZONE-HOSTED POLYMETALLIC SULFIDES IN THE SOUTH LIMOUSIN AREA, MASSIF CENTRAL, FRANCE: REMOBILIZED SULFIDE DEPOSITS RELATED TO VARISCAN COLLISIONAL TECTONICS AND AMPHIBOLITE FACIES METAMORPHISM." Economic Geology 99, no. 4 (June 2004): 819–27. http://dx.doi.org/10.2113/gsecongeo.99.4.819.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Murphy, J. Brendan, and Gabriel Gutiérrez-Alonso. "The origin of the Variscan upper allochthons in the Ortegal Complex, northwestern Iberia: Sm–Nd isotopic constraints on the closure of the Rheic Ocean." Canadian Journal of Earth Sciences 45, no. 6 (June 2008): 651–68. http://dx.doi.org/10.1139/e08-019.

Full text

Abstract:

Northwestern Iberia preserves a stack of allochthons in which the vestiges of a suture zone generated during the Variscan orogeny by the late Paleozoic collision between Laurussia and Gondwana are exposed. Lower allochthons contain Ordovician ophiolite (known as the Lower Ophiolite), and are structurally overlain by Devonian ophiolite (Upper Ophiolite), which are in turn structurally overlain by allochthons containing high-grade metamorphic rocks with continental affinities and Late Cambrian – Early Ordovician protolith ages (known as the Upper Units). Geochemical and Sm–Nd isotopic data from the Upper Ophiolite and the structurally overlying Upper Units exposed in the Ortegal Complex of Galicia show that these allochthons are derived from a variety of mantle and crustal sources and indicate that the suture zone juxtaposes a variety of oceanic assemblages. The general isotopic characteristics of each assemblage are similar to allochthons in other Variscan complexes in NW Iberia suggesting that the allochthons are each derived from a common source and may be regionally extensive. One of the bodies mapped within the Upper Ophiolite (Purrido amphibolite) is a composite body that, in addition to recently identified Mesoproterozoic mafic rocks, is characterized by a juvenile signature at ca. 395 Ma that was chemically modified from coeval intra-oceanic subduction. The very high ϵNd of this Late Devonian ophiolite is typical of several penecontemporaneous ophiolites within the Variscan orogen including the Lizard Complex (Britain) and the Massif Central (France), suggesting derivation from a regionally extensive anomalous mantle characterized by time-integrated depletion in Nd relative to Sm. Paleozoic mafic rocks in the Upper Units have ϵNd values typical of Paleozoic mafic rocks in Avalonia, which are thought to have been derived from subcontinental lithospheric mantle (SCLM) that was enriched at ca. 1.0 Ga. They exhibit elevated Th/Yb and Ce/Yb relative to Ta/Yb suggesting that their composition has been contaminated by subduction zone components, although the age of this contamination is unclear. Felsic rocks in the Upper Units were derived by melting of Mesoproterozoic or older (West African?) crust. These data, when combined with other geologic constraints, including the outboard position of the Upper Units relative to the ophiolite, support the hypothesis that the Upper Units collectively represent a crustal fragment that drifted from Gondwana during the formation of the Rheic Ocean, was transferred to Laurussia in Silurian or early Devonian times, and was subsequently thrust over the Gondwanan margin during the closure of the Rheic Ocean and the Variscan orogenesis.

APA, Harvard, Vancouver, ISO, and other styles

7

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

23

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

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.

Full text

Abstract:

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).

APA, Harvard, Vancouver, ISO, and other styles

28

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

38

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

39

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

43

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

48

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

49

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

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.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!