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Evolution Tectono Metamorphique De La Continuite Lithologique Des Roches Vertes Du Superieur Dans La Zone Orogenique De La Province Du Grenville
Download Evolution Tectono Metamorphique De La Continuite Lithologique Des Roches Vertes Du Superieur Dans La Zone Orogenique De La Province Du Grenville full books in PDF, epub, and Kindle. Read online Evolution Tectono Metamorphique De La Continuite Lithologique Des Roches Vertes Du Superieur Dans La Zone Orogenique De La Province Du Grenville ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Geology and Metallogeny of the Chapais-Chibougamau Mining District by : Pierre Pilote
Download or read book Geology and Metallogeny of the Chapais-Chibougamau Mining District written by Pierre Pilote and published by [Chibougamau? Québec] : Institut canadien des mines Chapais-Chibougamau. This book was released on 1998-01-01 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Genesis of Precambrian Iron and Manganese Deposits by : Unesco
Download or read book Genesis of Precambrian Iron and Manganese Deposits written by Unesco and published by . This book was released on 1973 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Notes on Geomagnetic Observatory and Survey Practice by : K. A. Wienert
Download or read book Notes on Geomagnetic Observatory and Survey Practice written by K. A. Wienert and published by . This book was released on 1970 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Quaternary Vegetation Dynamics by : Jürgen Runge
Download or read book Quaternary Vegetation Dynamics written by Jürgen Runge and published by CRC Press. This book was released on 2021-11-28 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book celebrates the relaunch of the African Pollen Database, presents state-of-the-art of modern and ancient pollen data from sub-Saharan Africa, and promotes Open Access science. Pollen grains are powerful tools for the study of past vegetation dynamics because they preserve well within sedimentary deposits and have a huge diversity in ornamentation that allows different taxa to be determined. The reconstruction of past vegetation from the examination of ancient pollen records thus can be used to characterize the nature of past landscapes (e.g. abundance of forests vs. grasslands), provide insights into changes in biodiversity, and gain empirical evidence of vegetation response to climatic change and human activity. In this, the 35th Volume of "Palaeoecology of Africa", we bring together new data and extensive synthetic reviews to provide novel insights into the relationships between human evolution, human activity, climate change and vegetation dynamics during the Quaternary, the last 2.6 million years. Current and ongoing climate and land-use change is exerting pressure on modern vegetation formations and threatening the livelihoods and wellbeing of many peoples in Africa. In this book the focus is on the Quaternary because it is during this geological period that the modern vegetation formations developed into their current configurations against a backdrop of high magnitude global climate change (glacial-interglacial cycles), human evolution, and a growing human land-use footprint. In this book the latest information is presented and collated from around the African continent to parameterize past vegetation states, identify the drivers of vegetation change, and assess the vegetation resilience to change. To achieve this research from two broad themes are covered: (i) the present is the key to the past (i.e. studies which improve our understanding of modern environments so that we can better interpret evidence from the past), and (ii) the past is the key to the future (i.e. studies which unlock information on how and why vegetation changed in the past so one can better anticipate trajectories of future change). This Open Access book will provide a strong foundation for future research exploring past ecological, environmental and climatic change within Africa and the surrounding islands. The book is organized regionally (covering western, eastern, central, and southern Africa) and it contains specialized articles focused on particular topics (such as modern pollen-vegetation relationships and fire as a driver of vegetation change), as well as regional and pan-African syntheses drawing together decades of research to assess key scientific questions (including the role of climate in driving vegetation change and the role of vegetation change in human evolution). These articles will be useful to students and teachers from high school to the highest level of university who are interested in the origins and dynamics of vegetation in Africa. Furthermore, it is also meant to provide societally relevant information that can act as an inspiration for the development of sustainable management practices for the future.
Book Synopsis Chemistry of the Iron-rich Sedimentary Rocks by : Harold Lloyd James
Download or read book Chemistry of the Iron-rich Sedimentary Rocks written by Harold Lloyd James and published by . This book was released on 1966 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chemical composition and occurrence of iron-bearing minerals of sedimentary rocks, and composition, distribution, and geochemistry of ironstones and iron-formations.
Book Synopsis Hot Brines and Recent Heavy Metal Deposits in the Red Sea by : Egon T. Degens
Download or read book Hot Brines and Recent Heavy Metal Deposits in the Red Sea written by Egon T. Degens and published by Springer. This book was released on 1969 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Ocean Basins: Their Structure and Evolution by : Open Open University
Download or read book The Ocean Basins: Their Structure and Evolution written by Open Open University and published by Elsevier. This book was released on 1998-01-26 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an invaluable textbook, prepared by the Open University team and designed so that it can be read on its own or as part of the OU course. This second edition has been fully revised and updated including new colour illustrations increasing the striking spread of full colour diagrams throughout the book. The clarity of the text has been improved, providing comprehensive coverage of the evolution of ocean basins and their structure in a clear, concise manner aimed specifically at the student market.In this second edition the technological advances in fields as diverse as:- deep-towed instruments for `sniffing' hydrothermal plumes- mapping the sea-floor by sophisticated sonar techniques - three-dimensional imaging of crustal structure by seismic tomography- the use of satellites for navigation, and for making precise measurements of the height of the sea-surfaceThe first chapters describe the processes that shape the ocean basins, determine the structure and composition of oceanic crust and control the major features of continental margins. How the 'hot springs' of the oceanic ridges cycle chemical elements between seawater and oceanic crust is then explored. Sediment distributions are examined next, to demonstrate how sediments can preserve a record of past climatic and sea-level changes. Finally, the role of the oceans as an integral part of global chemical changes is reviewed. - High quality full colour diagrams - Substantial chapter summaries ideal for revision - Answers, hints and notes for questions at back of the book
Book Synopsis Grand Canyon Geology by : J. Michael Timmons
Download or read book Grand Canyon Geology written by J. Michael Timmons and published by Geological Society of America. This book was released on 2012 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Geology of the Lake Superior Region by : Gene L. LaBerge
Download or read book Geology of the Lake Superior Region written by Gene L. LaBerge and published by Tucson, Ariz. : Geoscience Press. This book was released on 1994 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considered one of the classic geologic areas of the world, the Lake Superior region is one of the most interesting geological areas in North America. An excellent resource for the reader, this book includes examples, photos, maps, and diagrams of the geology of this region.
Book Synopsis Saline Deposits: A Symposium based on Papers from the International Conference on Saline Deposits, Houston, Texas, 1962 by : Richard B. Mattox
Download or read book Saline Deposits: A Symposium based on Papers from the International Conference on Saline Deposits, Houston, Texas, 1962 written by Richard B. Mattox and published by Geological Society of America. This book was released on 1968 with total page 765 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chronologie des événements sédimentaires, magmatiques et tectono-métamorphiques du Précambrien d'Afrique centrale occidentale (Gabon) by : Francis Mayaga-Mikolo
Download or read book Chronologie des événements sédimentaires, magmatiques et tectono-métamorphiques du Précambrien d'Afrique centrale occidentale (Gabon) written by Francis Mayaga-Mikolo and published by . This book was released on 1997 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE PRECAMBRIEN DU GABON EST COMPOSE DE TERRAINS ARCHEENS DES MASSIFS DU NORD-GABON ET DU CHAILLU, DES FORMATIONS REPUTEES D'AGE PALEOPROTEROZOIQUE DE L'OGOOUE, DES SEDIMENTS PALEOPROTEROZOIQUES DU FRANCEVILLIEN, DES PLUTONS D'AGE EBURNEEN DU MAYOMBE (OU CHAINE OUEST-CONGOLIENNE). DES DATATIONS RADIOMETRIQUES (PB-PB, U-PB, RB-SR ET SM-ND, AR-AR) ONT ETE UTILISEES AFIN DE CONTRAINDRE L'AGE DES EVENEMENTS SEDIMENTAIRES, MAGMATIQUES, TECTONIQUES ET METAMORPHIQUES QUI ONT AFFECTE CES DIFFERENTES ENTITES. L'ETUDE GEOCHRONOLOGIQUE MONTRE QUE L'ACCRETION DES TERRAINS PALEOPROTEROZOIQUES SE FAIT AUTOUR DES NOYAUX ARCHEENS DONT LES PLUS VIEUX TEMOINS, D'AGE ANTERIEUR A 3100 MA, SERAIENT PRESENTS DANS LES MONTS DE CRISTAL AU NORD-GABON. L'HISTOIRE ARCHEENNE SE DEROULERAIT ENSUITE DE LA FACON SUIVANTE: ENTRE 3100-3000 MA: PREMIER METAMORPHISME DE HAUT GRADE ; 3000-2950 MA: MISE EN PLACE DIACHRONE DES GREENSTONE BELTS. DURANT LA MEME PERIODE ET JUSQU'A 2850 MA DES INTRUSIONS GRANITIQUES A TONALITIQUES SE METTENT EN PLACE. ELLES PROVOQUENT DANS L'ENCAISSANT, SOIT DES RECRISTALLISATIONS DANS DES CONDITIONS GRANULITIQUES, SOIT DES RETROMORPHOSES. L'EVOLUTION ARCHEENNE S'ACHEVE ENTRE 2800 ET 2500 MA, AVEC LA MISE EN PLACE DES ULTRABASIQUES DE KINGUELE, DES LEUCOGRANITES, DES PEGMATITES, DES MONZONITES ET DES GRANITES. CES PROCESSUS DIAPIRIQUES FINI-ARCHEENS DE GRANDE AMPLEUR ASSOCIES A UNE TECTONIQUE VERTICALE VONT FAVORISER L'APPARITION, A PARTIR DE 2500 MA, DES PREMIERS BASSINS SEDIMENTAIRES TELS QUE L'OGOOUE. CE DERNIER SERA ENSUITE ENGAGE DANS UN OROGENE PALEOPROTEROZOIQUE QUI S'ACCOMPAGNE D'UNE REMOBILISATION DE MATERIEL ARCHEEN. LES TROIS PHASES TECTONO-METAMORPHIQUES D1, D2 ET D3 RESPONSABLES DE SA STRUCTURATION EN DOMAINE OROGENIQUE COLLISIONNEL SONT RESPECTIVEMENT POSTERIEURE A 2440 MA, SYN-2120 MA ET SYN-A POST 2040-2000 MA. PARALLELEMENT LES METABASITES DE L'OGOOUE, REPUTEES PRE-OROGENIQUES S'AVERERAIENT ETRE D'AGE ARCHEEN. LES CONTRAINTES AR-AR SUR L'AGE DES MINERALISATIONS D'ETEKE ASSOCIEES A L'EVOLUTION TECTONO-METAMORPHIQUE DU DOMAINE DE L'OGOOUE N'ONT REVELE QUE DES AGES DE REFROIDISSEMENT AUTOUR DE 1850-1870 MA. LES SEDIMENTS FLUVIO-DELTAIQUES DU FRANCEVILLIEN MOYEN A SUPERIEUR (2050-1780 MA) S'INDIVIDUALISENT A LA FIN DE CETTE EVOLUTION TECTONIQUE COLLISIONNELLE, EN POSITION D'AVANT-PAYS. PARALLELEMENT, LES INVESTIGATIONS RB-SR DANS LA FAILLE SYN-D3 DE L'IKOYE-IKOBE ONT REVELE UN REJEU PANAFRICAIN DE CELLE-CI VERS 530 MA. ENFIN, LA COMPARAISON DE L'HISTOIRE GEOLOGIQUE DE LA PARTIE OCCIDENTALE DU CRATON DU CONGO AVEC LE CRATON DE SAO FRANCISCO (BRESIL), MONTRE QU'EN CE QUI CONCERNE LES BLOCS ARCHEENS, LES PLUS VIEUX TEMOINS DE L'HISTOIRE ARCHEENNE PRECOCE NE SONT NETTEMENT RECONNUS QU'AU BRESIL (3200-3400 MA), EN REVANCHE AU PALEOPROTEROZOIQUE, DE PART ET D'AUTRE DE L'ATLANTIQUE, LES PROCESSUS GEODYNAMIQUES ET OROGENIQUES SONT SIMILAIRES
Book Synopsis Evolution tectono-métamorphique d'un segment de croûte continentale archéenne by : Alain Potrel
Download or read book Evolution tectono-métamorphique d'un segment de croûte continentale archéenne written by Alain Potrel and published by . This book was released on 1994 with total page 359 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BUT DE CETTE THESE EST DE DETERMINER L'EVOLUTION D'UN SEGMENT DE CROUTE CONTINENTALE ARCHEENNE, AINSI QUE L'INFLUENCE DE L'HISTOIRE PROTEROZOIQUE SUR LES CARACTERISTIQUES ORIGINELLES DE LA REGION. LA REGION CHOISIE EST L'AMSAGA (DORSALE REGUIBAT, CRATON OUEST AFRICAIN). L'APPROCHE EMPLOYEE EST PLURIDISCIPLINAIRE. LE PREMIER CHAPITRE CONSTITUE UN RAPPEL DU CONTEXTE GEOLOGIQUE REGIONAL. LE DEUXIEME CHAPITRE MET EN EVIDENCE LES GRANDS TRAITS STRUCTURAUX ET METAMORPHIQUES DE LA REGION. LA CARACTERISATION GEOCHIMIQUE DES PROTOLITHES MAGMATIQUES EST EFFECTUEE AU COURS DU TROISIEME CHAPITRE. LES GRANDES ETAPES GEOCHRONOLOGIQUES SONT DEFINIES AU COURS DU QUATRIEME CHAPITRE. ENFIN, LA SYNTHESE DES RESULTATS OBTENUS EST EFFECTUEE AU COURS DU DERNIER CHAPITRE. UN MODELE GEODYNAMIQUE TENANT COMPTE DE CES RESULTATS ET DES DIFFERENTS MODELES ACTUELLEMENT DEBATTUS SUR L'ARCHEEN EST PROPOSE DANS CETTE CINQUIEME PARTIE
Book Synopsis Les roches métamorphiques et leur signification géodynamique by : Jacques Kornprobst
Download or read book Les roches métamorphiques et leur signification géodynamique written by Jacques Kornprobst and published by Elsevier Masson. This book was released on 1996 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cet ouvrage traite de façon détaillée des roches et des séries métamorphiques, ainsi que des processus à l'origine de leur formation. Il expose les principes de l'analyse des assemblages minéralogiques. Après un bref aperçu sur le régime thermique de la lithosphère et ses perturbations, les mécanismes réactionnels sont examinés sur une base thermodynamique succincte. La description des textures et des structures des roches conduit à la notion de chronologie relative des assemblages et à celles de " chemin P, T, t ". L'évaluation des conditions physiques des recristallisations permet de discuter la notion de faciès et de sous-faciès métamorphiques, ainsi que l'analyse géométrique des systèmes à 1, 2 et 3 constituants indépendants. On aborde alors la géothermobarométrie à l'aide de quelques réactions divariantes, puis la notion d'activité dans les solutions solides minérales. Cet exposé général se conclut sur la signification des inclusions fluides. On se consacre ensuite à l'interprétation des séries métamorphiques dans leur contexte géodynamique. A partir du métamorphisme de contact, où domine le mode de transfert de chaleur par conduction, l'ouvrage explore différentes situations dans lesquelles les transferts " convectifs " de chaleur sont essentiels. Une description de l'évolution minéralogique des roches ultramafiques du manteau supérieur permet d'embrasser les recristallisations métamorphiques à l'échelle de l'ensemble de la lithosphère. Sa présentation claire, une illustration abondante et une bibliographie complète rendent cet ouvrage accessible aux non-spécialistes, leur permettant d'acquérir des connaissances de base sur l'origine et l'évolution des séries métamorphiques. Un éclairage, simplifié mais précis, sur les processus physiques et thermodynamiques associés au métamorphisme, initiera les futurs pétrologues aux méthodes d'étude des assemblages minéralogiques.
Book Synopsis Evolution structurale et métamorphique de la croûte continentale archéenne (Craton de Dharwar, Inde du Sud) by : Hugues Bouhallier
Download or read book Evolution structurale et métamorphique de la croûte continentale archéenne (Craton de Dharwar, Inde du Sud) written by Hugues Bouhallier and published by . This book was released on 1995 with total page 227 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this thesis is to characterize the tectonie and metamorphie evolution of an Archaean continental segment (>2.5 Ga). The studied area is the Dharwar craton (South lndia) where deeper and deeper structural levels outcrop from North to South. This area has not been affected by post-Archaean deformation. We show that the disclosed strain field is the result of interfering gravitational diapirie bodies and regional shortening. At crustal scale, structures (diapirs and transcurrent shear zones) were developed within a single event that can be dated at around 2.5 Ga. They are synchronous with (i) an episode of juvenile continental crust formation (Closepet batholith) and (ii) regional metamorphism (migmatisation, granulitisation). Strain fields are not consistent with thrusts and stacking structures as usually observed in modern collision belts. The petrographie study reveals that sorne specifie diapiric zones, which underwent fast burial, have recorded a metamorphic prograde history associated with a pressure increase (from 3 to 7-8 kbar). Furthermore, these areas display sorne differences in the fluid phase that seem to be linked with the variations of permeability resulting from the type and the geometry of the metamorphic fabrics. ln summary, the Archaean continental crust of Dharwar craton does not display any structure that could be responsible for the thiekening of the crust. The regional strain results from body forces (diapirism) associated with boundary forces (transcurrent shear zones). The gravitational diapiric instabilities which concern large volumes of crust cannot be the result of crustal thickening and constitute a distinctive feature of Archaean tectonics
