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 : "Poétique et politique de l'altérité : colonialisme, esclavagisme, exotisme dans la littérature et les arts (XVIIe-XXIe siècles)" : colloque international, le 12 mars 2015. Université des Antilles et de la Guyane
Description : La reconstitution de spectacles coloniaux, considérés comme dispositifs immersifs fondés sur une poétique de l'effet : à partir d'une scénarisation discordante ou d'une contre-narration (storytelling) par rapport au « grand récit » colonial de l'État-Nation, mais également de son incorporation, voire de sa métabolisation (embodiment) conjointe par le performeur et le spectateur, l'allégorie théâtrale engage un processus de reconstitution (re-enactment) du rapport à l'Histoire, source d'une conscientisation potentiellement émancipatrice (empowerment), voire d'une capacité de mobilisation (agency) nouvelle.
Siècle(s) traité(s) : 19
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V15136
V15136
V15136

Éditeur(s) : ECMEA : Etudes Croisées des Mondes Européens et Américains CRILLASH : Centre de Recherches Interdisciplinaires en Lettres, Langues, Arts et Sciences Humaines
Extrait de : "Terres promises, représentations et imaginaires" : colloque, du 25 au 27 novembre 2015. Université des Antilles
Description : Cette communication se propose d'examiner, dans la production culturelle du journaliste, professeur d'université, essayiste et poète afro-dominicain Blas Jiménez, le processus de récupération et de ré-articulation de ce que Victoria Lavou a appelé « la mémoire assignée », comme stratégie d'affirmation d'identité culturelle et ethnique dans un espace topographiquement, politiquement et économiquement fragmenté comme l'est la Caraïbe. Partant de l'« afrorealismo », concept analytique et théorique proposé par le critique et écrivain costaricain Quince Duncan, ce travail tentera d'examiner comment Blas Jiménez Abreú, s'appuie sur un projet littéraire, lyrique, fragmenté du point vue typographique pour recréer et décrire un espace caribéen fragmenté et, au passage, articuler une plateforme discursive dont l'objectif est d'inscrire l'africanité et la transafricanité dans la caribeñidad (culturelle y géographique). Le projet culturel de Jiménez Abreú ouvre un espace de réflexion et d'expression à la transafricanité présent/absent, visible/invisible selon les vicissitudes de l'histoire de la République Dominicaine. Pour cette étude nous utiliserons les textes suivantes : Caribe africano en despertar (1984), Exigencias de un cimarrón en sueños (1987) y El nativo (1996).

Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V16216
V16216

Éditeur(s) : INRA : Institut National de la Recherche Agronomique CIRAD : Centre de Coopération Internationale en Recherche Agronomique pour le Développement Université des Antilles. Service commun de la documentation
Extrait de : 52e congrès annuel de la Société caribéenne des plantes alimentaires / 52nd annual meeting of the Caribbean food crops society (CFCS), du 10 au 16 juillet 2016. INRA, CFCS
Description : Acknowledging the contribution of agriculture to global changes and its negative impacts on the environment, it is now seen as unavoidable for it to participate to the ecological transition. This research aims to understand the performativity of legal texts. This performativity does not only reveal the institutions? approach of the model to implement. It also aims to change, in the meantime, the reality (Ambroise et al., 2015). The objective of this research is to stress the importance of concepts? definitions in policies implementation when agricultural system reframing is at stake, and to highlight an uncertain use of words may produce. However, little attention is given to the choice of terms concerning the definition of a greener agriculture in official texts: terms are often mixed up without any clarification. Applying content analysis to official documents, we provide an analytical grid to grasp in what extent the unclear use of words and what they namely designate, lead to ambiguous policies eluding aspects of the concept of agroecology underlined by researchers or associations. We also shed light on the local appropriation process of the concept and its specification in the French Indies. Reconnaissant la contribution de l'agriculture aux changements globaux et à ses impacts négatifs sur l'environnement, on le voit maintenant comme inévitable pour qu'il participe à la transition écologique. Objectifs de ces recherches pour comprendre le performativity des textes juridiques. Ce performativity indique non seulement l'approche des établissements du modèle à l'instrument. Il vise également à changer, dans le même temps, la réalité (Ambroise et autres, 2015). L'objectif de cette recherche est de souligner l'importance des définitions des concepts dans l'exécution de politiques quand le système agricole reframing est en jeu, et accentuer une utilisation incertaine des mots peut produire. Cependant, peu d'attention est accordée au choix des termes au sujet de la définition d'une agriculture plus verte en textes officiels : des termes sont souvent mélangés sans n'importe quelle clarification. S'appliquant à l'analyse du contenu aux documents officiels, nous fournissons une grille analytique à la prise dans quelle ampleur l'utilisation peu claire des mots et ce qu'ils à savoir indiquent, mènent aux politiques ambiguës éludant des aspects du concept de l'agroécologie souligné par des chercheurs ou des associations. Nous avons également jeté la lumière sur le processus local d'appropriation du concept et de ses spécifications dans les Antilles françaises.
Siècle(s) traité(s) : 21
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V16255
V16255

Éditeur(s) : CRILLASH : Centre de Recherches Interdisciplinaires en Lettres, Langues, Arts et Sciences Humaines
Extrait de : "La prégnance du lieu dans la Caraïbe" : colloque, les 14 et 15 avril 2016. Université des Antilles
Description : Pablo Mella Febles (Philosophe, Insituto Superior Pedro Fco, République dominicaine) propose une réflexion sur la décolonisation du lieu et l'énonciation littéraire. Il s'inscrit dans le registre de l'inversion de la perspective structuraliste et propose d'enquêter sur la façon dont la constitution de la langue se réfère à diverses situations dans lesquels il est accompli l'acte de parler. En ce sens, il souligne les risques de folkloriser la voix des pauvres, où il y a une décontextualisation de la voix. Il insiste sur les politiques du lieu où le lieu est entendu comme politique à partir duquel il faut une décentralisation de la production de la connaissance et une ré-articulation des relations entre le global et le local, de l'espace et du temps pour une énonciation politique polyphonique.

Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V16042
V16042

Éditeur(s) : Université des Antilles
Extrait de : "La Guadeloupe au sein de l'organisation des Etats de la Caraïbe orientale : une adhésion pour quoi faire ?" : journées d'étude, le 28 février et le 15 mars 2019. Université des Antilles
Description : L'OECE : une organisation de coopération et d'intégration régionale. La Guadeloupe, situe?e au milieu de l'arc insulaire des petites Antilles, partage une forte communaute? d'inte?re?t avec les E?tats membres de la CARICOM et plus singulie?rement avec les E?tats membres ou associe?s de l'OECO. Les relations historiques et culturelles qui existent notamment entre la Guadeloupe, la Dominique, la Martinique et Sainte-Lucie justifient de?ja? l?instauration d?un partenariat base? sur l?exploitation des capacite?s de chacun a? contribuer a? un de?veloppement en termes e?conomique, social, culturel, scientifique et technologique. Des défis communs, une coopération nécessaire sont les thèmes développés par Mrs Fred Reno, Directeur du CAGI et Julien Merion, Président du CORECA.
Siècle(s) traité(s) : 21
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V19052
V19052

Éditeur(s) : Ranelagh Press Ranelagh Press ( London )
Résumé : (Internal Comments) by C.E.R. Alford. Re-edited by Kathleen Noreen Alford.
(Statement of Responsibility) by C.E.R. Alford. Re-edited by Kathleen Noreen Alford.
Trinidad and Tobago -- Tobago
Tobago

AGN2040
20688621
001370433

Éditeur(s) : D. Appleton & Co. D. Appleton & Co. ( New York )
Résumé : (Citation/Reference) Checklist Amer. imprints
Spine title: Robinson Crusoe; caption title, p. 261: Life and adventures of Robinson Crusoe, updated.
Engravers include: Adolphe Best, Brévière, Cherrier, Cowland, Hans, Lacoste et Fils, Aglae Laisné, Nivet, Quartley, Rambert, Sears, Verdeil, and Whitehead et Sheeres.
Parts I and II of Robinson Crusoe. Part II originally published under title: Farther adventures of Robinson Crusoe.
Includes publisher's advertisement 4 p. and catalog (12 p.) at end.
Library's copy imperfect: all separate, single page illustrations lacking (approx. 80 p.).
(Statement of Responsibility) by Daniel Defoe ; with a memoir of the author, and an essay on his writings ; illustrated by Grandville.
United States -- New York -- New York

Droits : This item is presumed to be in the public domain. The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions may require permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact The Department of Special and Area Studies Collections (special@uflib.ufl.edu) with any additional information they can provide.
27089962

Résumé : When Henry B. Plant brought the railroad to Tampa in 1884, he opened the door for many businesses to locate and flourish here. The railroad was at the center of the city's economy. From downtown it went to Port Tampa where one could board a Plant steamship to Jamaica, Cuba, New Orleans, Bermuda or other destinations. A spur of the rail line brought the train up to the west front of the hotel so guests could depart the train and walk directly into the lobby. The Tampa Bay Hotel cost approximately 2.5 million dollars to build and $500,000 to furnish. Consisting of 511 rooms, some of which were suites of 3-7 rooms, it provided a degree of luxury never before seen in Tampa. Most of the rooms had their own baths and all had electricity and telephones. In addition, guests were surrounded by a varied collection of furniture, porcelains, Venetian-style mirrors, and sculptures gathered by Mr. and Mrs. Plant in their travels in Europe. The Tampa Bay Hotel opened in 1891 amid wide fanfare and celebration. Henry Plant's dream was now a reality. The newspapers of the day described it as "brightly illuminated, filled with sumptuous decorations, thrilling music and graced with turrets, domes and minarets towering heavenward and glistening in the sun." It was a Victorian palace. The hotel was a lively place with balls, tea parties, and organized hunts during the winter social season. It was open seasonally from December to April in the 1890's. Once a guest arrived at the hotel, he needed to be entertained. Guests went wild game hunting as well as fresh and salt-water fishing. Water sports were also included like sailing, rowing, and canoeing. For the less adventuresome, there were bicycles, carriages, and rickshaws to ride you around the property. The hotel also offered golf, tennis, shuffleboard, billiards, and even a racetrack.
(Funding) Funded in part by the Institute for Museum and Library Services (IMLS), Ephemeral Cities Project.
Tampa |z 1271000 |2 ceeus
Hillsborough County |z 12057 |2 ceeus
United States of America -- Florida -- Hillsborough County -- Tampa

Droits : All rights reserved. 2005.
D20-007

Éditeur(s) : Farming Systems Support Project, International Programs, Institute of Food and Agricultural Sciences, University of Florida Farming Systems Support Project, International Programs, Institute of Food and Agricultural Sciences, University of Florida ( Gainesville Fla )
Résumé : (Statement of Responsibility) préparé par: Farming Systems Support Project ... rédaction technique: John Caldwell, TIm Frankenberger; rédaction coordination: Lisette Walecka.
"Octobre 1987."
Spiral bound.
(Funding) Electronic resources created as part of a prototype UF Institutional Repository and Faculty Papers project by the University of Florida.
Haiti
Developing countries
Developing countries

71042283

Résumé : When Henry B. Plant brought the railroad to Tampa in 1884, he opened the door for many businesses to locate and flourish here. The railroad was at the center of the city's economy. From downtown it went to Port Tampa where one could board a Plant steamship to Jamaica, Cuba, New Orleans, Bermuda or other destinations. A spur of the rail line brought the train up to the west front of the hotel so guests could depart the train and walk directly into the lobby. The Tampa Bay Hotel cost approximately 2.5 million dollars to build and $500,000 to furnish. Consisting of 511 rooms, some of which were suites of 3-7 rooms, it provided a degree of luxury never before seen in Tampa. Most of the rooms had their own baths and all had electricity and telephones. In addition, guests were surrounded by a varied collection of furniture, porcelains, Venetian-style mirrors, and sculptures gathered by Mr. and Mrs. Plant in their travels in Europe. The Tampa Bay Hotel opened in 1891 amid wide fanfare and celebration. Henry Plant's dream was now a reality. The newspapers of the day described it as "brightly illuminated, filled with sumptuous decorations, thrilling music and graced with turrets, domes and minarets towering heavenward and glistening in the sun." It was a Victorian palace. The hotel was a lively place with balls, tea parties, and organized hunts during the winter social season. It was open seasonally from December to April in the 1890's. Once a guest arrived at the hotel, he needed to be entertained. Guests went wild game hunting as well as fresh and salt-water fishing. Water sports were also included like sailing, rowing, and canoeing. For the less adventuresome, there were bicycles, carriages, and rickshaws to ride you around the property. The hotel also offered golf, tennis, shuffleboard, billiards, and even a racetrack.
(Funding) Funded in part by the Institute for Museum and Library Services (IMLS), Ephemeral Cities Project.
Tampa |z 1271000 |2 ceeus
Hillsborough County |z 12057 |2 ceeus
United States of America -- Florida -- Hillsborough County -- Tampa

Droits : All rights reserved. 2005.
D29-009

Éditeur(s) : Printed for T. Cadell and W. Davies W. Blackwood Printed for T. Cadell and W. Davies ( London (Strand) ) W. Blackwood ( Edinburgh )
Résumé : (Citation/Reference) NUC pre-1956,
(Statement of Responsibility) embellished with engravings from designs by Thomas Stothard.
Caption title, v. 2: Further adventures of Robinson Crusoe.
"Printed by A. and R. Spottiswoode, Printers Street, London" -- V. 1, verso of half-title p., v.2, leaf opposite t.p.
Plates engraved by C. Heath, printed by B. McQueen.
Probably the samae as Lovett, R. W. Robinson Crusoe, 247, although Lovett states that the plates for this edition were re-engraved by a James Heath.
Parts I and II of Robinson Crusoe. Part II originally published under title: Farther adventures of Robinson Crusoe.
England -- London
Scotland -- Edinburgh

Droits : This item is presumed to be in the public domain. The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions may require permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact The Department of Special and Area Studies Collections (special@uflib.ufl.edu) with any additional information they can provide.
63956309

Éditeur(s) : ACH : Association of Caribbean Historians ACH : Association of Caribbean Historians ACH : Association of Caribbean Historians
Extrait de : 46e colloque de l'Association des historiens de la Caraïbe, du 11 au 15 mai 2014.
Résumé : "Dans son livre "A Concise History of the Caribean" (2011), Barry Higman exclu la principale Amérique du Sud. Dans Caribbean History : "From re-Colonial Origins to the Present" (2012), Tony Martin parle beaucoup des Guyanes. Lequel de ces deux ouvrages prévaudra dans l'enseignement de l'histoire des Caraïbes ? La communication se penchera sur les écrits de Martin sur les Caraïbes et la façon dont la région est présentée dans ses interactions avec le reste du monde."
"Dans son livre "A Concise History of the Caribean" (2011), Barry Higman exclu la principale Amérique du Sud. Dans Caribbean History : "From re-Colonial Origins to the Present" (2012), Tony Martin parle beaucoup des Guyanes. Lequel de ces deux ouvrages prévaudra dans l'enseignement de l'histoire des Caraïbes ? La communication se penchera sur les écrits de Martin sur les Caraïbes et la façon dont la région est présentée dans ses interactions avec le reste du monde."
Siècle(s) traité(s) : 21
Droits : CC-BY-NC-ND - Attribution - Pas d'utilisation commerciale - Pas de modification
Permalien : http://www.manioc.org/fichiers/V14260
V14260
V14260
V14260

Éditeur(s) : Librairie Berger-Levrault, Librairie Berger-Levrault Librairie Berger-Levrault, Librairie Berger-Levrault ( Paris )
Résumé : (Internal Comments) par Saint-Re´ny.
(Bibliography) Includes bibliographical references.
(Statement of Responsibility) par Saint-Rény.
Haiti
Haiti
Haiti
Haiti
Haiti

AFE6788
02228749
001062853

Éditeur(s) : Librairie Berger-Levrault, Librairie Berger-Levrault Librairie Berger-Levrault, Librairie Berger-Levrault ( Paris )
Résumé : (Internal Comments) par Saint-Re´ny.
(Bibliography) Includes bibliographical references.
(Statement of Responsibility) par Saint-Rény.
Haiti
Haiti
Haiti
Haiti
Haiti

AFE6788
02228749
001062853

Éditeur(s) : Impr. de l'e´tat Impr. de l'État Impr. de l'e´tat Impr. de l'État ( Port-au-Prince )
Résumé : (Internal Comments) par le Re´ve´rend Pere Audet, sous les auspices de L'Institut prophilactique d'Hai¨ti, le 7 juillet 1941.
(Statement of Responsibility) par le Révérend Pere Audet, sous les auspices de L'Institut prophilactique d'Haïti, le 7 juillet 1941.
Haiti
Haiti

AFM6580
20603304
001129372

Résumé : When Henry B. Plant brought the railroad to Tampa in 1884, he opened the door for many businesses to locate and flourish here. The railroad was at the center of the city's economy. From downtown it went to Port Tampa where one could board a Plant steamship to Jamaica, Cuba, New Orleans, Bermuda or other destinations. A spur of the rail line brought the train up to the west front of the hotel so guests could depart the train and walk directly into the lobby. The Tampa Bay Hotel cost approximately 2.5 million dollars to build and $500,000 to furnish. Consisting of 511 rooms, some of which were suites of 3-7 rooms, it provided a degree of luxury never before seen in Tampa. Most of the rooms had their own baths and all had electricity and telephones. In addition, guests were surrounded by a varied collection of furniture, porcelains, Venetian-style mirrors, and sculptures gathered by Mr. and Mrs. Plant in their travels in Europe. The Tampa Bay Hotel opened in 1891 amid wide fanfare and celebration. Henry Plant's dream was now a reality. The newspapers of the day described it as "brightly illuminated, filled with sumptuous decorations, thrilling music and graced with turrets, domes and minarets towering heavenward and glistening in the sun." It was a Victorian palace. The hotel was a lively place with balls, tea parties, and organized hunts during the winter social season. It was open seasonally from December to April in the 1890's. Once a guest arrived at the hotel, he needed to be entertained. Guests went wild game hunting as well as fresh and salt-water fishing. Water sports were also included like sailing, rowing, and canoeing. For the less adventuresome, there were bicycles, carriages, and rickshaws to ride you around the property. The hotel also offered golf, tennis, shuffleboard, billiards, and even a racetrack.
(Funding) Funded in part by the Institute for Museum and Library Services (IMLS), Ephemeral Cities Project.
Tampa |z 1271000 |2 ceeus
Hillsborough County |z 12057 |2 ceeus
United States of America -- Florida -- Hillsborough County -- Tampa
Lafayette Street

Droits : All rights reserved. 2005.
D20-008

Éditeur(s) : Department of English, University of Florida Department of English, University of Florida ( Gainesville, FL )
Résumé : Presentation as part of the Spring 2014 UF Digital Humanities Working Group ( DHWG ) series of Meet-Ups on "Online Courses and Re/Sources".
Presentation on the DOCC (Distributed Online Collaborative Course) "Panama Silver, Asian Gold: Migration, Money, and the Making of the Modern Caribbean" taught in Fall 2013.

Droits : Applicable rights reserved.
http://ufdc.ufl.edu/AA00021037/00001

Éditeur(s) : Pergamon-elsevier Science Ltd
Résumé : The late Quaternary has experienced large glacial/interglacial climatic variations and related 10's to 100 meters high-amplitude sea level fluctuations at Milankovich frequencies from 10's to 100 kyr during which carbonate platform tops have been exposed and re-flooded in many occasions. This study focuses on the accumulation of calci-turbidites, the aragonite onset/sharp increase in fine sediments and their timing in deep basins adjacent to carbonate platforms. A particular emphasis is developed on the occurrence of the first gravity flow event and aragonite onset/sharp increase and their linkage to the initial re-flooding of the platform tops during deglaciations. Three basins adjacent to isolated platforms in the Bahamas, the Northern Nicaragua Rise, and the Gulf of Papua, were selected to represent pure carbonate versus mixed systems, in quiescent versus tectonically active settings, and various carbonate bank top morphologies, ranging from atoll to relatively deeply and narrowly flooded flat top banks. In spite of these differences, each record illustrates a clear relationship between the timing of platform top re-flooding and initiation of significant carbonate export by gravity flows and low-density plumes into the surrounding basins. The concept of "re-flooding window" is introduced to characterize the prolific period of time during which bank and atoll-tops are flooded enough to produce large export of bank-derived aragonite and of calci-turbidites in adjacent basins. According to our datasets, the main re-flooding windows have occurred mainly on the last part of the sea level rise at each glacial termination (T), those periods being marked by some of the highest rates of sea level rise. The analysis of a long-piston core from the earthquakes-prone Walton Basin (Northern Nicaragua Rise) demonstrates that sea level, not seismic activities, played a major role as trigger mechanism for the initiation of gravity flows since the last four glacial/interglacial transitions, and supports the existence of an extra glacial termination during the early portion of the transition from MIS 7.4 to MIS 7.3 (TIIIA). (C) 2010 Elsevier Ltd. All rights reserved.
Quaternary Science Reviews (0277-3791) (Pergamon-elsevier Science Ltd), 2010-08 , Vol. 29 , N. 17-18 , P. 2010-2026

Droits : 2010 Elsevier Ltd All rights reserved.
http://archimer.ifremer.fr/doc/00012/12298/9095.pdf
DOI:10.1016/j.quascirev.2010.04.016
http://archimer.ifremer.fr/doc/00012/12298/

Éditeur(s) : Ernest Nister ; Ernest Nister E.P. Dutton & Co. Ernest Nister ;
Résumé : (Statement of Responsibility) re-told for the little ones by L.L. Weedon.
(Citation/Reference) Lovett, R.W. Robinson Crusoe,
(Citation/Reference) NUC pre-1956,
Ill. signed AW or Arch Webb.
"Printed in Bavaria"--P. 128.
Front. included in paging.
Each leaf of plate has two or three scenes.
Part I of Robinson Crusoe, retold.
"No. 3533."
University of Florida's copy imperfect: spine and one plate lacking.
England -- London
United States -- New York -- New York

Droits : This item is presumed to be in the public domain. The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions may require permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact The Department of Special and Area Studies Collections (special@uflib.ufl.edu) with any additional information they can provide.
28121072

Éditeur(s) : HAL CCSD
Résumé : East African Rift (EAR) is the divergent plate boundary. EAR exposes different stages of extension, from early stage rifting in Tanzania to oceanic accretion in Afar (Ethiopia). Manyara basin is the southernmost rift system of the east branch of EAR with recent volcanism (< 1.5 Ma) and a seismic swarm in the lower crust (20 – 40 km). Due to its location and tectonic setting, the Manyara basin offers the opportunity to study the earliest stage of rift initiation. Manyara volcanism is composed of several types of hyper-alkaline lavas as Mg-nephelinites (Mg# > 55) (Labait, Kwaraha), calciocarbonatite (Kwaraha) and evolved nephelinites (Mg# < 35) (Hanang).Mg-nephelinites (Labait and Kwaraha) are primary lavas mainly composed of olivine and clinopyroxene (cpx). Geochemical modelling from trace elements suggests that these primary magmas result from a degree of partial melting < 1 % from a CO2-garnet-phlogopite-bearing peridotite. These magmas have an asthenospheric source at depth > 120 km (lava carries xenoliths with equilibrium conditions > 4 GPa). The minerals were crystallized from a magma with a low H2O content (0.1 and 0.5 wt% H2O). The calciocarbonatite and evolved nephelinites are derived from Mg-nephelinites by fractional crystallization and immiscibility processes. Hanang nephelinites are silica- and alkaline-rich lavas (44.2 – 46.7 wt % SiO2, 9.5 –12.1 wt % Na2O+K2O, respectively) composed by cpx, Ti-garnet, nepheline, apatite and titanite. Complex zonation of cpx (e.g. abrupt change of Mg#, Nb/Ta, and H2O) and trace element patterns of nephelinites record magmatic differentiation involving open system with carbonate-silicate immiscibility and primary melt replenishment. The low H2O content of cpx (3 – 25 ppm wt. H2O) indicates that at least 0.3 wt % H2O was present at depth during carbonate-rich nephelinite crystallization at 340 – 640 MPa and 1050 – 1100 °C. The study of hosted-nepheline melt inclusions from Hanang allows constraining the late magmatic evolution of nephelinites during storage and magma ascent. Melt inclusions are composed by a silicate trachytic glass, a carbonate phase and a shrinkage bubble. Trachytic glass contains high content in CO2 (0.43 wt %, SIMS analyses), sulfur (0.21 – 0.92 wt % S), chlorine (0.28 –0.84 wt % Cl) and H2O low content (< 0.1 wt %, Raman analyses). Immiscibility process leading to the formation of carbonate occurs in a closed system during rapid magma ascent between 200 – 500 MPa. The carbonate phase is a Ca-Na-K-S-rich and anhydrous carbonate (33 wt % CaO, 20 wt % Na2O, 3 wt % K2O, and 3 wt % S). The pre-immiscible liquid has a phonolitic composition with 6 ± 1.5 wt % CO2 at 700 MPa. A preliminary study of melt inclusions by XANES spectroscopy and whole rocks by Mössbauer spectroscopy was used to determine these Manyara lavas were formed at oxidizing conditions (~ ΔFMQ +1.5).The early stage rifting volcanism (Manyara Basin) is characterized by CO2-rich and H2O-poor magmas from at least 120 km below the rift escarpment. The presence of CO2-rich magmas and the small amount of volcanic rocks erupted at the surface may indicate that the storage and percolation of these magmas at depth is a potential trigger for deep seismic swarms.
Le rift Est africain (REA) est une frontière de plaque en extension. Ce rift présente plusieurs stades d’extension, de l’initiation du rift en Tanzanie jusqu’à l’accrétion océanique en Afar. Le bassin de Manyara se situe le plus au sud de branche Est du REA. Il est caractérisé par la présence de volcanisme récent (< 1,5 Ma) et d’un essaim sismique dans la croûte inférieure (20 – 40 km). De par sa localisation et son contexte tectonique, le bassin de Manyara offre l’opportunité d’étudier le stade le plus précoce de l’initiation du rift. Le bassin de Manyara est composé de plusieurs types de laves hyperalcalines, les néphélinites magnésiennes (Mg# > 55) (Labait, Kwaraha), de calciocarbonatite (Kwaraha) et des néphélinites différenciées (Mg# < 35) (Hanang).Les néphélinites magnésiennes (Labait et Kwaraha) sont des laves primaires composées d’olivines et de clinopyroxènes (cpx). La modélisation géochimique des éléments en trace suggère que ces magmas primaires résultent d'un degré de fusion partielle ≤ 1 % à partir d'une péridotite à grenat et phlogopite. Ces magmas proviennent d’une profondeur > 120 km (présence de xénolites avec des conditions d’équilibre > 4 GPa). Les minéraux ont cristallisés à partir d’un magma pauvre en eau (0,1 et 0,5 pds % H2O). La calciocarbonatite et les néphélinites différenciés sont issues des néphélinites magnésiennes par cristallisation fractionnée et processus d’immiscibilité. Les néphélinites du Hanang sont riches en éléments alcalins (9,5 – 12,1 pds % Na2O+K2O) et en silice (44,2 – 46,7 pds% SiO2) et sont composés de cpx, grenat, néphéline, titanite et apatite. La zonation complexe dans les cpx (par exemple, changement brusque de Mg#, Nb/Ta, et H2O) implique une différenciation magmatique en système ouvert avec immiscibilité de liquide carbonaté et silicaté ainsi qu’un remplissage de la chambre magmatique avec des liquides primaires. La faible teneur en eau des cpx (3 – 25 ppm H2O) indique la présence d’un magma pauvre en eau (0,3 pds % H2O) lors de la cristallisation des cpx à des conditions crustales (340 – 640 MPa et 1050 – 1100 °C). L’étude des inclusions vitreuses dans les néphélines de Hanang permet de contraindre l'évolution magmatique tardive des néphélinites et le comportement des éléments volatils (CO2, H2O, S, F, Cl) lors du stockage et de la remontée du magma. Les inclusions vitreuses sont composées d’un verre trachytique, d’une phase carbonatée et d’une bulle de rétraction. Le verre trachytique contient du CO2 (0,43 pds % CO2, analyses SIMS), du soufre (0,21 à 0,92 pds% S), du chlore (0,28 – 0,84 pds % Cl) et très peu d’H2O (< 0,1 pds % H2O, analyses Raman). Le processus d’immiscibilité conduisant à la formation du carbonate se produit dans un système fermé pendant l'ascension rapide du magma, entre 200 – 500 MPa. La phase carbonatée est un carbonate anhydre et riche en Ca-Na-K-S (33 pds % CaO, 20 pds % Na2O, 3 pds % K2O, et 3 pds % S). Le liquide pré-immiscible a une composition phonolitique avec 6 ± 1,5 pds % CO2 à une pression de 700 MPa. Une étude préliminaire des inclusions par spectroscopie XANES et des roches par spectroscopie Mössbauer a permis de déterminer que les laves de Manyara se sont formées à conditions oxydantes (~ ∆FMQ +1,5).À l’initiation du rift, le volcanisme dans le bassin de Manyara est caractérisé par des magmas riches en CO2 et pauvres en H2O issus d’au moins 120 km de profondeur sous l'escarpement du rift. La présence de ces magmas riches en CO2 et la faible quantité de roches volcaniques émises à la surface peuvent indiquer que le piégeage et la percolation de ces magmas en profondeur est un déclencheur potentiel des essaims sismiques profonds.
https://tel.archives-ouvertes.fr/tel-01563231

NNT : 2016MONTT114
tel-01563231
https://tel.archives-ouvertes.fr/tel-01563231
https://tel.archives-ouvertes.fr/tel-01563231v2/document
https://tel.archives-ouvertes.fr/tel-01563231/file/2016_BAUDOUIN_archivage.pdf