Éditeur(s) : CRILLASH : Centre de Recherches Interdisciplinaires en Lettres, Langues, Arts et Sciences Humaines CRILLASH : Centre de Recherches Interdisciplinaires en Lettres, Langues, Arts et Sciences Humaines
Extrait de : "Réel merveilleux, réalisme merveilleux, réalisme magique et baroque (III)" : journée d'étude, le 7 mai 2015. Université des Antilles et de la Guyane
Description : Par quelle mathématique des signes le jeune auteur haïtien, Faubert Bolivar (1979), nous donne-t-il à saisir l'univers dramatique singulier de ses pièces de théâtre, La Flambeau et Jesika ou Bousiko, et l'espace fictionnel énigmatique de son récit poétique, Sainte Dérivée des trottoirs ? Comment évaluer cette expression littéraire qui semble toucher le possible extrême de certaines réalités haïtiennes connues, et pourtant si peu vraisemblables pour une catégorie de lecteurs, et la relation que développent les personnages de Bolivar avec ces topos récurrents dans son écriture livrée aux jeux de langage et d'onirisme avéré : la folie, l'intime et le cosmique (ou le religieux) ? Ainsi, parler de poétique du mystère, c'est esquisser le balbutiement d'une théorie littéraire qui est presqu'un prétexte à faire découvrir, à faire entendre, cette parole littéraire neuve, d'un autre ton, qui marque la rupture avec tout ce qui relèverait d'une esthétique du réel ou du réalisme merveilleux. Le mode d'intrusion des mystères-mêmes ? fantômes, fous ou esprits vodous ? dans les espaces réels énoncés par les textes bolivariens paraît résister absolument à ce penchant de certains critiques occidentaux à vouloir conclure hâtivement, concernant des écrits de ce style, en faveur de l'esthétique précitée. Mystère donc, comme l'écho de l'indicible dans l'agencement des signes, dans la stratégie de construction et de déconstruction de l'espace réel, imaginaire et symbolique, dans la mise en oeuvre textuelle des traits quasi insaisissables d'une culture individuelle et d'une culture collective, multiple, instable, fuyante, souvent étrange ? Mystère ?
Siècle(s) traité(s) : 20
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V15202
V15202
V15202

Éditeur(s) : Université des Antilles et de la Guyane. Service commun de la documentation
Extrait de : Les rencontres culturelles de la BU 2013-2014. Université des Antilles et de la Guyane
Description : La bibliothèque universitaire reçoit l'historien Pap Ndiaye, professeur à Sciences po, autour de la publication de son ouvrage "La condition noire : essai sur une minorité française" (Calmann-Lévy, 2008, puis Folio Gallimard). L'échange est animé par Steve Gadet, enseignant-chercheur au département d'Anglais de l'UAG. Pap Ndiaye évoque les raisons de la faible existence des études sociologiques sur les Noirs en France et les réticences des chercheurs en sciences humaines et sociales français à aborder les inégalités sociales au-delà des questions de classes, puis développe sa méthodologie dont le point de départ est l'expérience sociale d'être considéré comme Noir, de se voir attribuer une identité. Ses travaux analysent l'expérience de l'étrangeté, du dehors, les discriminations, le racisme.
Siècle(s) traité(s) : 21
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V14201
V14201

Éditeur(s) : CEREAP : Centre d'Etudes et de Recherches en Esthétique et Arts Plastiques IUFM : Institut Universitaire de Formation des Maîtres de Martinique CEREAP : Centre d'Etudes et de Recherches en Esthétique et Arts Plastiques IUFM : Institut Universitaire de Formation des Maîtres de Martinique
Extrait de : "Regards croisés sur : Art et folie" : Conférence, le 23 avril 2013. Université des Antilles et de la Guyane
Résumé : "Sophie Ravion D'Ingianni présente d'abord en quelques mots la relation existant entre art et folie, à travers le portrait du peintre Van Gogh. Elle se penche ensuite sur l'oeuvre de Fernando Nannetti, Carlo Zinelli, Aloïse Corbaz et Judith Scott
"Sophie Ravion D'Ingianni présente d'abord en quelques mots la relation existant entre art et folie, à travers le portrait du peintre Van Gogh. Elle se penche ensuite sur l'oeuvre de Fernando Nannetti, Carlo Zinelli, Aloïse Corbaz et Judith Scott
Siècle(s) traité(s) : 21
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V13152
V13152
V13152
V13152

Éditeur(s) : Girardin Girardin ( Paris, Paris )
Résumé : (Additional Physical Form) Also issued online.
Engraved head-pieces.
Sixty portraits were issued to accompany both the folio and quarto editions of the "Revolution franc̜aise". These are not contained in this set.
Consists of Table chronologique du Moniteur. Année 1789-1799. t. 1-3. (Preceded by "Analyse de l'introduction de 1787 à 1789". 19 p.) Table alaphabétique du Moniteur, de 1787 jusqu'à l'an 8, de la République (1799) t. 1-2. Noms d'hommes t.3. Noms des villes t.4 Titres des matières.
Haiti
France

17532699
36005853

Résumé : Arbol de 10 a 15 m o más, de copa densa, redondeada; corteza resinosa. Hojas alternas, oblongo-lanceoladas, agudas o acuminadas, subcoriáceas. Flores verdosas o amarillentas, fragantes, en grandes panículas; pétalos de 5 mm, glabros. Drupa elipsoidea a oblícuamente reniforme, de 5 a 15 cm, mesocarpo carnoso amarillo, agridulce.
Arbre de 10 à 15 m ou davantage, tête dense, arrondie; écorce résineuse. Feuilles alternes, oblongues-lancéolées, pointues ou acuminées, subcoriaces. Fleurs verdâtres ou jaunâtres, odorantes, en grandes panicules; pétales de 5 mm, glabres. Drupe ellipsoïdale à obliquement réniforme, de 5 à 15 cm, mésocarpe charnu, jaune, aigre-doux.
Tree evergreen, 10-15 m high with a dense, rounded crown of foliage, bark resinous.  Leaves alternate, simple, spirally arranged, lanceolate-elliptical, 10-25 cm x 2.5-8 cm; inflorescence a terminal panicle ca 30 cm long; flowers 5-8 mm in diameter, greenish or yellowish, fragrant; fruit a fleshy drupe, ellipsoid to obliquely reniform, 5-15 cm long.
Nativa del sureste asiático, cultivada en zonas tropicales y subtropicales de todo el mundo.
Originaire du sud-est asiatique, cultivée dans les zones tropicales et subtropicales du monde entier.
Native to Southeast Asia, cultivated in tropical and su

http://www.tramil.net/fototeca/plant220

Éditeur(s) : Girardin Girardin ( Paris, Paris )
Résumé : (Additional Physical Form) Also issued online.
Engraved head-pieces.
Sixty portraits were issued to accompany both the folio and quarto editions of the "Revolution franc̜aise". These are not contained in this set.
Consists of Table chronologique du Moniteur. Année 1789-1799. t. 1-3. (Preceded by "Analyse de l'introduction de 1787 à 1789". 19 p.) Table alaphabétique du Moniteur, de 1787 jusqu'à l'an 8, de la République (1799) t. 1-2. Noms d'hommes t.3. Noms des villes t.4 Titres des matières.
Haiti
France

17532699
36005853

Éditeur(s) : HAL CCSD American Association of Petroleum Geologists
Résumé : International audience
We describe the structure, microstructure, and petrophysical properties of fault rocks from two normal fault zones formed in low-porosity turbiditic arkosic sandstones, in deep diagenesis conditions similar to those of deeply buried reservoirs. These fault rocks are characterized by a foliated fabric and quartz-calcite sealed veins, which formation resulted from the combination of the (1) pressure solution of quartz, (2) intense fracturing sealed by quartz and calcite cements, and (3) neoformation of synkinematic white micas derived from the alteration of feldspars and chlorite. Fluid inclusion microthermometry in quartz and calcite cements demonstrates fault activity at temperatures of 195degC to 268degC. Permeability measurements on plugs oriented parallel with the principal axes of the finite strain ellipsoid show that the Y axis (parallel with the foliation and veins) is the direction of highest permeability in the foliated sandstone (10-2 md for Y against 10-3 md for X, Z, and the protolith, measured at a confining pressure of 20 bars). Microstructural observations document the localization of the preferential fluid path between the phyllosilicate particles forming the foliation. Hence, the direction of highest permeability in these fault rocks would be parallel with the fault and subhorizontal, that is, perpendicular to the slickenlines representing the local slip direction on the fault surface. We suggest that a similar relationship between kinematic markers and fault rock permeability anisotropy may be found in other fault zone types (reverse or strike-slip) affecting feldspar-rich lithologies in deep diagenesis conditions.
ISSN: 0149-1423

hal-00903428
https://hal.archives-ouvertes.fr/hal-00903428
DOI : 10.1306/03071312127

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
This study presents microstructural evidence for deformation-controlled melt organization and for changes in olivine deformation associated with the presence of melt in an 80 m vertical section of the crust-mantle transition zone in the Oman ophiolite. This zone represents an 'end member' case for analyzing feedbacks between deformation and melt distribution in the upper mantle, since it experienced strong shear strains in presence of large melt fractions. It is characterized by a subhorizontal compositional layering at the mm to meter scale, from weakly impregnated dunites to olivine-rich gabbros, which parallels a pervasive foliation containing a strong stretching lineation. The parallelism between the compositional layering and the foliation, the diffuse limits of the layers, the alignment of elongated plagioclase-rich aggregates devoid of internal deformation structures with the elongation of olivine crystals in the dunitic layers, and the sharp compositional changes across some, but not all layer limits suggest deformation plays an essential role on the development of the layering. The variation on a mm-scale of the olivine crystal preferred orientation (CPO) symmetry as a function of the modal content: from axial-[100] symmetry in layers with <70% modal olivine to axial-[010] in more gabbroic levels (<40% olivine), which is repeated over the entire section, implies deformation in presence of variable melt fractions. Axial-[100] olivine CPO in olivine-rich layers is consistent with deformation by dislocation creep under high temperature, low pressure, dry conditions. Axial-[010] olivine CPO patterns imply additional sliding along preferentially wetted (010) grain boundaries, increase in the activity of [001] glide, or transpression localized in the melt-rich layers. Since the change in CPO symmetry is not accompanied by dispersion, instantaneous melt fractions must have remained <30-40% in all layers. The continuous variation in olivine CPO symmetry with decreasing olivine content implies therefore that the former depends on the cumulated strain in presence of melt rather than on the instantaneous melt fraction.
ISSN: 0012-821X

hal-00795508
https://hal.archives-ouvertes.fr/hal-00795508
DOI : 10.1016/j.epsl.2012.10.003

Résumé : The slides were taken on collecting trips sponsored by the William L. Bryant Foundation, where books, music and art indigenous to the regions were gathered. They are organized by geographical location.
Coconut trees. Seascape through foliage.
Haiti -- Caribbean region
Haiti
Haiti
Haiti

Droits : All rights to images are held by the respective holding institution. This image is posted publicly for non-profit educational uses, excluding printed publication. For permission to reproduce images and/or for copyright information contact Special Collections & University Archives, University of Central Florida Libraries, Orlando, FL 32816 phone (407) 823-2576, email: speccoll@mail.ucf.edu
CFM1972_01a
Sheet 54:20
http://ufdc.ufl.edu/CA01200245/00001

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
To quantify the relationships between anisotropy. S-wave splitting and tectonics, we determined the seismic properties of lower-crustal and upper-mantle rocks outcropping in the lvrea Zone (Northem Italy). We obtained P-and S-wave seismic velocities by laboratory direct velocity measurements and/or by calculations based on the modal compositions of the rocks, the lattice preferred orientations (LPOs), and the single crystal stiffness coefficients. Measured P-and S-wave velocities (6.0-7 .5 km s-1 and 3.6-4.2 km s-1) are typical of the lower crust. The P-wave anisotropy is in the range 0-l 0%. Shear-wave birefringence is in the range 0.0-0.6 km s-1 , with typical values between 0.0 and 0.2 km s-1 • In many cases, the birefringence is clearly related to fabric elements (foliation, lineation). Mafic rocks such as anorthosite or pyroxene-bearing gabbros exhibit low P-wave anisotropies (< 5%) and low shear-wave birefringences (less than 0.1 km s-1). In contrast, the seismic properties of felsic rocks such as biotite-bearing gneisses and mafic rocks such as amphibolites display high V P anisotropy (10%) and strong birefringence (0.3 km s-1). Biotite and amphibole preferred orientations clearly control seismic anisotropy and particularly shear-wave splitting. In these rocks, maximum splitting is observed in directions parallel to the foliation with the fast split shear wave polarized parallel to the foliation plane. To have an overview of the seismic properties of this lower-crustal section at a broader scale, we calculated from our data the anisotropie seismic properties of several hypothetical samples that are perhaps more representative of the regional anisotropy than each sample individually. For instance, the average lower-crustal sample displays an anisotropy of 5.5% for P waves and a birefringence around 0.14 km s I for S waves propagating parallel to the foliation. We observe little splitting for waves propagating at high angle to the foliation.
ISSN: 0031-9201

hal-01389712
http://hal.univ-reunion.fr/hal-01389712
http://hal.univ-reunion.fr/hal-01389712/document
http://hal.univ-reunion.fr/hal-01389712/file/Barruol_Kern-PEPI96_hal.pdf
DOI : 10.1016/0031-9201(95)03124-3

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Superposed to ductile syn-metamorphic deformations, post-foliation deformations affect metamorphic units during their exhumation. Understanding the role of such deformations in the structuration of metamorphic units is key for understanding the tectonic evolution of convergence zones. We characterize post-foliations deformations using 3D modelling which is a first-order tool to describe complex geological structures, but a challenging task where based only on surface data. We propose a modelling procedure that combines fast draft models (interpolation of orientation data), with more complex ones where the structural context is better understood (implicit modelling), allowing us to build a 3D geometrical model of Syros Island blueschists (Cyclades), based on field data. With our approach, the 3D model is able to capture the complex present-day geometry of the island, mainly controlled by the su-perposition of three types of post-metamorphic deformations affecting the original metamorphic pile: i) a top-to-South ramp-flat extensional system that dominates the overall island structure, ii) large-scale folding of the metamorphic units associated with ramp-flat extensional system, and iii) steeply-dipping normal faults trending dominantly NNW-SSE and EW. The 3D surfaces produced by this method match outcrop data, are geologically consistent, and provide reasonable estimates of geological structures in poorly constrained areas.
ISSN: 0191-8141

insu-01188400
https://hal-insu.archives-ouvertes.fr/insu-01188400
DOI : 10.1016/j.jsg.2015.07.002

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
The seismic (elastic) properties of the crust have been modelled using hypothetical polycrystals with typical crustal compositions and commonly measured petrofabrics. This modelling allows us to better evaluate and quantify the crustal contribution to splitting of teleseismic SKS-waves. Mafic rocks such as anorthosite or pyroxene-bearing gabbros have complex S-waves properties, i.e. with small shear-wave anisotropies (< 3%) and without clear relationships between the fast shear-wave polarization plane orientations and the fabric. On the other hand foliated felsic rocks such as gneisses or schists and mafic rocks such as amphibole-bearing gabbros are strongly birefringent (anisotropies greater than 5%) and exhibit clear relationships with the structure. Biotite and amphibole preferred orientations clearly play a major rote in shear-wave splitting in crustal rocks. We show strong correlations between the orientation of the foliation and the amplitude of the delay time. Maximum delay time is systematically observed for waves propagating parallel to the foliation. The fast shear-wave is furthermore polarized parallel to the foliation plane. We calculate a delay time of about 0.1-0.2 s per 10 km of crustal rocks.
ISSN: 0031-9201

hal-01389713
http://hal.univ-reunion.fr/hal-01389713
http://hal.univ-reunion.fr/hal-01389713/document
http://hal.univ-reunion.fr/hal-01389713/file/Barruol_SKS_crust_PEPI1993_hal.pdf
DOI : 10.1016/0031-9201(93)90161-2

Éditeur(s) : HAL CCSD AGU and the Geochemical Society
Résumé : International audience
Peridotite xenoliths brought up to the surface by the volcanism of the Kerguelen Islands represent a mantle that has been affected by a high degree of partial melting followed by intense melt percolation above the Kerguelen plume. These xenoliths are therefore particularly suitable to investigate effects of melt-rock interaction on crystallographic fabrics (lattice-preferred orientation (LPO)) of peridotite minerals and on the LPO-induced seismic properties of peridotites above a mantle plume. We have studied a suite of 16 ultramafic samples representative of different degrees of partial melting and magma-rock interaction among which the protogranular harzburgites are the least metasomatised xenoliths and dunites are the ultimate stage of metasomatism. Olivine LPO is characterized by high concentration of [010] axes perpendicular to the foliation and [100] axes close to the lineation or distributed in the foliation plane in harzburgites, whereas the high concentration of [100] axes is parallel to the lineation and [010] axes is perpendicular to the assumed foliation in dunites. Olivine LPO in harzburgites is interpreted as being due to a deformation regime in axial compression or transpression. The fabric strength of olivine decreases progressively from protogranular to poikilitic harzburgites and finally to dunites, for which it remains nevertheless significant (J index 3.8). Seismic properties calculated from LPO of minerals indicate that metasomatism at higher melt/rock ratio lowers the P wave velocities. The most significant difference between harzburgites and dunites corresponds to the distribution of S wave anisotropy. Harzburgites display the maximum of anisotropy within the foliation plane and the minimum of anisotropy perpendicular to the foliation plane, whereas the lowest anisotropy is parallel to the lineation for dunites. These modifications of seismic properties as a result of metasomatic processes may induce seismic heterogeneities in the mantle above the Kerguelen plume. In addition, assuming a lithospheric mantle primarily harzburgitic and structured with a horizontal foliation, the seismic properties calculated for the Kerguelen xenoliths reconcile the rather high anisotropy evidenced by the horizontally propagating surface waves with the apparent isotropy revealed by the absence of splitting of vertically propagating teleseismic SKS waves recorded by the GEOSCOPE Kerguelen station.
ISSN: 1525-2027

hal-00366222
https://hal.archives-ouvertes.fr/hal-00366222
https://hal.archives-ouvertes.fr/hal-00366222/document
https://hal.archives-ouvertes.fr/hal-00366222/file/bascou_Kerguelen_2007GC001879_hal.pdf
DOI : 10.1029/2007GC001879

Éditeur(s) : Girardin Girardin ( Paris, Paris )
Résumé : (Additional Physical Form) Also issued online.
Engraved head-pieces.
Sixty portraits were issued to accompany both the folio and quarto editions of the "Revolution franc̜aise". These are not contained in this set.
Consists of Table chronologique du Moniteur. Année 1789-1799. t. 1-3. (Preceded by "Analyse de l'introduction de 1787 à 1789". 19 p.) Table alaphabétique du Moniteur, de 1787 jusqu'à l'an 8, de la République (1799) t. 1-2. Noms d'hommes t.3. Noms des villes t.4 Titres des matières.
Haiti
France

17532699
36005853

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
Melt generation in the continental crust is thought to significantly influence seismic bulk velocities and anisotropy, although existing laboratory data provide limited constraints on such seismic attributes. In this study we measured ultrasonic compressional wave speeds (Vp) and anisotropy during sample compaction, mica-breakdown and melt-generation in synthetic, foliated quartz–muscovite aggregates. Measurements were performed at peak conditions of 300 MPa hydrostatic confining pressure and 750 °C, over a six hour time period, for three separate samples where wave propagation directions were aligned at 0°, 45° and 90° with respect to the foliation plane. The experiments are initially marked by sample compaction and rapid reduction in porosity (from 25% to <2 vol%), with a corresponding increase in Vp. During initial stages of the experiment Vp ranges from 4.65 to 5.45 km/s, depending on the direction of the P wave propagation, resulting in up to ∼16% anisotropy, which originates mainly from the preferred orientation of muscovite and possible incipient melt lenses oriented parallel to foliation. As the experiment progresses the bulk Vp decreases gradually and Vp anisotropy drops from ∼16% to ∼2% after five hours into the experiment. The drop in anisotropy is caused by muscovite-breakdown and increasing amount of partial melting of the aggregate. The bulk velocities are considerably lower than predicted for a mixture of muscovite and β-quartz (stable at 300 MPa and 750 °C). Thermodynamic modeling indicates that mica breakdown and production of melt with ∼2 wt% dissolved water in the aggregate can explain the low Vp, even though β-quartz is stable; the modeled Vp is ∼4.75 km/s at 300 MPa and 750 °C. These ultrasonic attributes signify movement of the melt to fill vacant pores and coating grain boundaries, effectively connecting melt films and reducing seismic anisotropy. The results may apply to regions where crustal melting is on-going, in particular regions of elevated temperature that are only weakly deforming, with coupled anomalously low bulk velocities and seismic anisotropy.
ISSN: 0012-821X

hal-01243569
https://hal.archives-ouvertes.fr/hal-01243569
DOI : 10.1016/j.epsl.2015.05.039

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
In the Oman ophiolite, the horizon where the melt lens pinched during drifting away from the ocean ridge axis has been identified. Starting in the Root Zone of the Sheeted Dike Complex (RZSDC) located above this horizon, 18 Sections down to the upper gabbros unit have been mapped in great detail, in selected areas of the southern massifs of this ophiolite. They are complemented by 133 sites, located throughout the entire ophiolite, where the transition from the RZSDC to the uppermost foliated gabbros is well exposed. Altogether, half the sites and 11 cross sections display, within a few tens of meters beneath the RZSDC, a magmatic foliation which is parallel to the overlying sheeted dikes. In the other sites and cross sections, the gabbro foliation is either flat-lying or steep but not parallel to the sheeted dikes. Compared to the RZSDC isotropic ophitic gabbros where clinopyroxene is interstitial between plagioclase laths, in the topmost steeply foliated gabbros, clinopyroxene is idiomorphic, becoming rapidly granular and tabular down section by recrystallization and peripheral alteration to hornblende. Moving down from these uppermost gabbros and over one hundred meters, the steep foliation becomes stronger and the poorly recovered top gabbros grade into the recrystallized, granular gabbros of the gabbro unit. These repeated observations indicate to ascribe these gabbros to subsidence of a compacting mush from the floor of the melt lens into the underlying, main magma chamber. The topmost gabbros beneath RZSDC, which were expelled from the melt lens by drifting very soon after settling on the melt lens floor, display in plagioclase a spectacular zoning pointing to a fast cooling. Moving downwards, stronger foliation, increased compaction and recovery-recrystallization are explained by the time spent by the subsiding mush inside the magma chamber increasing by one order of magnitude (similar to 50 to 500 yr) over this vertical distance. This field-based study brings compelling field evidence supporting the former models of subsidence which were based on the assumption that the mush that settled onto the floor of the melt lens is sucked downwards during drifting of the crust away from the ridge axis.
ISSN: 0012-821X

hal-00420903
https://hal.archives-ouvertes.fr/hal-00420903
DOI : 10.1016/j.epsl.2009.04.012

Résumé : (Funding) Support for the development of the technical infrastructure and partner training provided by the United States Department of Education TICFIA program.
Ma Folie (Saint Thomas, V.I.) -- Saint Thomas (V.I.)
Caribbean

Éditeur(s) : Université de Guyane
Extrait de : "Bals masqués de Guyane et d'ailleurs. Identités et imaginaires carnavalesques en question" : colloque international, les 26 et 27 janvier 2017. Université de Guyane
Description : Importance du bal masqué en Guadeloupe. Dès le 17è siècle de nombreux documents attestent de la présence du carnaval en Guadeloupe. A travers les récits des bals masqués qui se déroulent dans des salons, dans son écrit intitulé premier voyage aux Antilles 1640, le révérend père Du Tertre en fait état, tout un passage de son ouvrage décrit un bal de nègres. Le carnaval est l'heure de la dérision de l'inversion de la révolte permise. Les esclaves profitant de cette situation, ont commencés à parcourir les rues, armés de bâton et de coutelas menaçant la vie des maîtres, les charries varies furent interdits à cette époque, par le procureur général du roi le 11 janvier 1870. Le bal masqué un espace baroque, le carnaval sur toute les latitudes conjure les peurs et exalte la folie humaine, ce rite est dédié aux dieux de la vie et de la mort. Les acteurs du carnaval jouent avec la mort, risquent leur vie, le masque fantôme dont il se couvre le visage et que l'on appel "larva" qui signifie fantôme ou "masqua" vient nous rappeler que la vie est songe et mensonge. L'homme qui danse le carnaval n'est que le jouait de son illusion, tous les jours nous revêtons un costume pour nous produire sur la scène du théâtre du monde. Le bal masqué n'est donc que la pal-copie de la vie.

Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V17166
V17166

Éditeur(s) : HAL CCSD Elsevier
Résumé : International audience
We investigated the deformation mechanisms and the seismic properties of 10 eclogite samples from different localities (Alps, Norway, Mali and eastern China) through the analysis of their microstructures and lattice-preferred orientations (LPO). These samples are representative of various types and intensity of deformation under eclogitic metamorphic conditions. Omphacite and garnet LPO were determined from electron backscatter diffraction (EBSD) technique. Garnet appears to be almost randomly oriented whereas omphacite develops strong LPO, characterized by the [001]-axes concentrated sub-parallel to the lineation, and the (010)-poles concentrated sub-perpendicular to the foliation. In order to analyze the deformation mechanisms that produced such omphacite LPO, we compare our observations to LPO simulated by viscoplastic self-consistent numerical models. A good fit to the measured LPO is obtained for models in which the dominant slip systems are 1/2h110i{11 ¯ 0}, [001] {110} and [001] (100). Dominant activation of these slip systems is in agreement with TEM studies of naturally deformed omphacite. Seismic properties of eclogite are calculated by combining the measured LPO and the single crystal elastic constants of omphacite and garnet. Although eclogite seismic anisotropies are very weak (less than 3% for both P-and S-wave), they are generally characterized by a maximum P-wave velocity sub-parallel to the lineation and by a minimum velocity approximately normal to foliation. The mean P-and S-wave velocities are high (respectively, 8.6 and 4.9 km/s). The S-wave anisotropy pattern displays complex relationships with the structural frame but the fast polarization plane generally tends to be parallel to the foliation. Calculated reflection coefficients show that an eclogite/crust interface is generally a good reflector (Rc > 0.1), whereas an eclogite body embedded in the upper mantle would be hardly detectable.
ISSN: 0040-1951

hal-01389715
http://hal.univ-reunion.fr/hal-01389715
http://hal.univ-reunion.fr/hal-01389715/document
http://hal.univ-reunion.fr/hal-01389715/file/Bascou_eclo-sismo_tphy2001_hal.pdf
DOI : 10.1016/S0040-1951(01)00156-1

Éditeur(s) : HAL CCSD American Geophysical Union
Résumé : International audience
The Oman ophiolite is regarded as derived from a fast spreading oceanic ridge. As in its present-day marine analogs, expectedly, the gabbro unit crystallized in a large magma chamber underneath a small melt lens. In ophiolites, this melt lens is reduced to a horizon mapped in the field, where the floor and the roof of the melt lens joined. The magmatic activity of the former melt lens has been studied in gabbros located below the melt lens horizon. Beneath a stable melt lens, gabbros subside and drift through the steep walls of the magma chamber as steeply foliated gabbros. In contrast, in unstable melt lenses more specifically considered here, flat-lying gabbros are exposed beneath the lens. These gabbros were settling on the floor while the melt lens was retreating. Their strong magmatic foliations and lineations point to a dynamic deposition on the floor, and lineation trends record the structure of convection rolls within the lens. Time constraints suggest a similar to 100 year periodicity of melt recharge by short and powerful melt pulses followed by a shorter time of convection activity after recharge and a longer period of static magma settling, as recently proposed for the East Pacific Rise. At each new melt pulse, the lens nearly doubles its volume by surface expansion, within a short time lapse, before slowly and progressively retreating to feed crustal accretion. Large horizontal surface inflation of the lens better explains the seawater hydration of the accreting crust than melt lens vertical motion through the lid.
ISSN: 0148-0227

hal-00617452
https://hal.archives-ouvertes.fr/hal-00617452
DOI : 10.1029/2010JB007934