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1. |
Record Nr. |
UNINA9910496001603321 |
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Autore |
Baroin Catherine |
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Titolo |
Gens du roc et du sable : Les Toubou / / Catherine Baroin |
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Pubbl/distr/stampa |
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Paris, : CNRS Éditions, 2020 |
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ISBN |
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Descrizione fisica |
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1 online resource (288 p.) |
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Collana |
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Altri autori (Persone) |
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BrandilyMonique |
BuijtenhuijsRobert |
CaronLouis |
FuchsPeter |
TourneuxHenry |
ZeltnerJean-Claude |
BaroinCatherine |
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Soggetti |
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Anthropology |
ethnologie |
Toubou |
pastoralisme |
nomadisme |
Sahara |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Sommario/riassunto |
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Natifs du massif rocheux du Tibesti au cœur du Sahara, ou des plaines de sable ou de cailloux qui s’étendent jusqu’au lac Tchad, les Toubou sont les voisins des Touaregs à l’est. Pasteurs saharo-sahéliens comme ceux-ci, ils sont moins connus que leurs célèbres confrères nomades. Ils occupent pourtant un quart du Sahara et jouent dans les troubles politiques du Tchad un rôle de premier plan, qui porte épisodiquement sur eux une certaine attention. Leur mode de vie pastoral est assez largement semblable à celui des Touaregs, mais leurs structures sociales sont bien différentes. Leur organisation politique est quasi inexistante, et invétéré leur esprit d’anarchie. Intrépides, guerriers, indépendants et querelleurs, ils manifestent entre eux de fortes |
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solidarités familiales que diffuse la pratique du mariage en dehors du cercle des proches parents. Chacun des auteurs de ce livre, administrateur colonial, historien, ethnologue ou autre, apporte sur le monde toubou son point de vue spécifique. Les observations pourtant convergent sur bien des points, et laissent transparaître l’unité culturelle de ce peuple qui s’adapte avec souplesse à la vie moderne, tout en conservant avec une étrange permanence ces caractéristiques psychiques qui firent, dans le passé, son originalité et sa force. |
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2. |
Record Nr. |
UNINA9910828781603321 |
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Autore |
O'Brien Neal R |
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Titolo |
Argillaceous Rock Atlas [[electronic resource] /] / by Neal R. O'Brien, Roger M. Slatt |
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Pubbl/distr/stampa |
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New York, NY : , : Springer New York : , : Imprint : Springer, , 1990 |
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ISBN |
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Edizione |
[1st ed. 1990.] |
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Descrizione fisica |
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1 online resource (XV, 141 p. 85 illus., 14 illus. in color.) |
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Disciplina |
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Soggetti |
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Mineralogy |
Mineral resources |
Geotechnical engineering |
Sedimentology |
Fossil fuels |
Mineral Resources |
Geotechnical Engineering & Applied Earth Sciences |
Fossil Fuels (incl. Carbon Capture) |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Bibliographic Level Mode of Issuance: Monograph |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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1 Introduction -- Definitions -- Argillaceous Rock Classifications -- Stratification and Parting Description -- Examples Seen in Outcrop -- Classification of Very Fine-Grained Sedimentary Rocks -- Textural Classification of Fine-Grained Sediments and Rocks -- 2 Fabric Analysis Techniques -- X-radiography -- Petrography -- Scanning Electron Microscopy -- 3 X-radiography, Petrography and Scanning |
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Electron Microscopy Descriptions -- X-radiography Classification of Argillaceous Rock Macrofabric -- Petrographic Classification of Black Shales -- Scanning Electron Microscopy Descriptions -- 4 Miscellaneous Features in Argillaceous Rocks -- Pyrite Framboids -- Fecal Pellets -- Palynomorphs in Shales -- 5 Case Studies of Specific Distinctive Features -- Well Developed Lamination in a Black Shale (Example I) -- Well Developed Lamination in a Black Shale (Example II) -- Organic Variation in a Shale — Clues to the Cause of Lamination -- Laminated Shale from Bottom-Flowing Low Density Turbidity Currents -- Bioturbation -- Bioturbation — Tiered Burrowing in Shale -- Significance of Vertical Fabric Variation in a Shale -- A Journey to “Anoxia” — Reconstruction of an Event on the Devonian Sea Floor -- 6 Case Studies of Fabric Analysis in Evaluating Sedimentary Processes and Environments -- Marine Regressional Facies -- Marine Transgressional Facies -- Floodplain-Paleosol Facies -- Evaporite Facies -- Tidal Flat Facies -- Shallow Marine Shelf Facies -- Delta Complex Facies -- Submarine Slope Facies -- Marine Turbidite Facies -- Deep Marine Turbidite Facies -- Marine Basinal Facies -- 7 Formation of Shale by Compaction of Flocculated Clay--A Model -- 8 Fabrics of Some Hydrocarbon Source Rocks and Oil Shales -- Marine Hydrocarbon Source Rock -- Saline Lacustrine Hydrocarbon Source Rock -- Fresh-Brackish Lacustrine Hydrocarbon Source Rock -- 9 Fabric of Geopressured Shale -- Geopressured Shale Analysis -- General Geology and Composition -- Description of Shale Fabric -- Interpretation of Shale Fabrics -- 10 Composition of Argillaceous Rocks -- 11 Conclusions -- References. |
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Sommario/riassunto |
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A major reason for the lack of understanding of argillaceous rocks is that the key to understanding their history lies in their microfabric. Argillaceous Rock Atlas addresses this aspect by taking a systematic approach to the analysis of shale fabrics. This approach combines such techniques as scanning electron microscopy, x-radiography and thin-section petrography. Thus the book is amply illustrated with scanning electron and thin section photomicrographs and x-radiograms which show the salient features of shale at a variety of scales. A great portion of the book is devoted to case studies, supplemented by mineralogical and geochemical data, which demonstrate the utility of these techniques in the interpretation of depositional environments, diagenetic processes and possible economic significance of argillaceous rocks. Argillaceous Rock Atlas is a valuable and unique reference for students and researchers involved in the fields of sedimentology and stratigraphy, petrology, petroleum geology, hydrogeology and geochemistry. |
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