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Author: Paul L. Hancock
Publisher: CRC Press
ISBN:
Category : Folds (Geology).
Languages : en
Pages : 238
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Book Description
Author: Paul L. Hancock
Publisher: CRC Press
ISBN:
Category : Folds (Geology).
Languages : en
Pages : 238
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Book Description
Author: Kenneth Coe
Publisher: Manchester University Press
ISBN:
Category : Folds (Geology)
Languages : en
Pages : 194
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Author: B.A. Wills
Publisher: Springer Science & Business Media
ISBN: 9400944764
Category : Technology & Engineering
Languages : en
Pages : 430
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Book Description
Due to the increasingly complex mineralogy, and lower grade of many current ore reserves, technology has, over the past decade, had to evolve rapidly to treat these materials economically in an industry which has undergone severe periods of recession. However, most of the technical innovations, such as the increasing use of solvent-extraction, ion-exchange etc., have been in the field of chemical ore processing, and, apart from the use of computers and ever larger unit process machines, there have been few major evolutionary changes in the field of physical mineral processing, where conventional crushing and grinding methods, essentially unchanged in half a century, are followed by the 'old-faithfuls'- flotation, gravity, magnetic and electrostatic methods of separation. Many of these techniques have major limitations in the treatment of 'new' ores such as complex sulphides, and the main purpose of the NATO Advanced study Institute (ASI) "Mineral Processing at a Crossroads" was to review the future of mineral processing. One of the great failings of physical methods is their inability to treat ultra-fine particles, and much research effort is required in this area. Flotation is still the most widely used and researched method for separating minerals, and is the only method which can be used to produce separate concentrates from complex sulphide ores. However, its performance on these 'modern' ores is poor, and it is in this area particularly that chemical methods will increasingly be integrated into plant circuits.
Author: Geological Society of London
Publisher: Geological Society of London
ISBN: 9781862390713
Category : Nature
Languages : en
Pages : 644
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Author: W. Manspeizer
Publisher: Elsevier
ISBN: 148329417X
Category : Science
Languages : en
Pages : 1018
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Book Description
Extensive field studies on the African and North American plates during this past decade have yielded a wealth of new data and ideas about rift basins and the origin of passive margins. New surface and subsurface basins have been identified; fossils abound in strata that only recently were considered barren; oil exploration is being actively pursued in continental strata of the Richmond-Taylorsville, Sanford and Newark basins, Late Triassic marine strata have been identified in Georges Bank off the coast of Massachusetts, and the roles of wrench tectonics, successor basins and listric normal faults have challenged the classical view that these are simple extensional basins.This two part work brings together representative examples of these studies. It is not intended as an exhaustive synthesis of the subject, but rather a vehicle to present new data, new ideas and alternative views. Some of the papers present regional summaries, others attempt to relate local features to regional questions, while others describe modern rift basins as possible analogs of early Mesozoic basins.Geologic data from the Atlantic passive margins record that continental rifting of central Pangaea occurred during the latest Triassic-earliest Jurassic (Liassic), and that sea-floor spreading probably began no later than the Middle Jurassic. The primary subject of this book focuses on the Triassic-Jurassic rifting events that led to the breakup of Pangaea and the opening of the central Atlantic Ocean. Whereas other treatises have focused on the origin of the passive margins, inferred primarily from geophysical data of the offshore basins, this volume primarily and uniquely focuses on land-based field studies of the onshore synrift basins. Offshore studies of synrift basins are also included and add substantially to our understanding of the breakup. However, the onshore data base, while complementary, is different, thus providing researchers with a different insight to the questions at hand.The book is organized into four sections. Section I, Pangaean Plate in Time and Space, first locates Pangaea in space and then places the Triassic basins within an historical context on the Alleghanian-Variscan Orogens. Section 2, the offshore and onshore basins of the North American and African Plates, comprises about 70% of all papers in this book, and includes papers on structural geology, petrology, paleontology, sedimentation, organic geochemistry, vulcanism and mineral resources. Section 3, Related Mesozoic Atlantic Rift Basins, includes papers on Iberia, Western Europe, the Benue Trough and Brazil. The final section of the book, Analogs, includes the rift basins of East Africa, the Red Sea, the Gulf of Elat (Aqaba), the Dead Sea and the Rio Grande.The book is richly illustrated throughout with figures, photographs, tables and fold-out maps, including nine in full colour.
Author: P.A. Floyd
Publisher: Springer Science & Business Media
ISBN: 9401115028
Category : Science
Languages : en
Pages : 257
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This volume illustrates some of the significant aspects of magmatic activity from Devonian (408 million years ago) to early Permian (270 million years ago) times in SW England. This period covers the progressive development of the Variscan mountain-building episode, from initial basin formation to final deformation and the subsequent development of a fold mountain belt - the Variscan Orogen. Both extrusive (volcanic) and intrusive (plutonic) rocks are found in the orogen, and chart the various stages of its magmatic development. The sites described in this volume are key localities selected for conservation because they are representative of the magmatic history of the orogen from initiation to stabilization. Some of the earliest volcanic activity in the Devonian is represented by submarine basaltic and rhyolitic lavas developed in subsiding basins, caused by the attenuation of the existing continental crust. In some cases, extensive rifting and attendant magmatism produced narrow zones of true oceanic crust, whereas elsewhere basaltic volcanism is related to fractures in the continental crust at the margins of the basins. After the filling of the sedimentary basins, and their deformation caused by crustal shortening (late Carboniferous Period), further activity is manifested by the emplacement of the Cornubian granites and later minor basaltic volcanism in the early Permian. Accounts of the constituent parts of this history have enriched geological literature from the nineteenth century onwards, and have contributed to the advancement and understanding of magmatic and tectonic processes.
Author: D. H. W. Hutton
Publisher: Blackwell Science
ISBN:
Category : Science
Languages : en
Pages : 288
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Author: J. Chantraine
Publisher: Springer Science & Business Media
ISBN: 3642849156
Category : Science
Languages : en
Pages : 745
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Book Description
This book provides an up-to-date synthesis of the Pre-Mesozoic Geology in France (Armorican and Central Massifs) and Related Areas (Aquitaine Basin, Vosges, Provence, Pyrenees, Western Alps, Corsica and Sardinia). The geological record is systematically presented, covering seismic reflection, gravity and magnetic data, stratigraphy, paleontology, structure, metamorphism, igneous activity and metallogeny. It is the most up-to-date English summary by French scientists, providing access to the vast literature on the topic mainly written in French. As such, it should be of great interest to an international audience.
Author: R.D. Dallmeyer
Publisher: Springer Science & Business Media
ISBN: 3642775187
Category : Science
Languages : en
Pages : 603
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Book Description
In August 1990, Project 233 of the International Geological Correlation Program hosted an international conference in G6ttingen/Giessen, Germany. Discussions were focused on the Tectonothermal and Stratigraphic Evolution of the Central European Orogens. The meeting marked the first opportunity for completely open scientific exchange following the recent political reformations in central Europe. This exciting new atmosphere of international cooperation resulted in presentation of a wealth of information which was new to scientists from both sides of former political boundaries. It was apparent that a unique opportunity was available to prepare a systematic overview in a volume dealing with the geology of Central Europe. The present book represents an outgrowth of this conference, but is not merely a compilation of the papers presented in G6ttingen/Giessen. Instead, it represents a coordinated volume designed to present a balanced, comprehensive view of our present understanding of the tectonothermal and stratigraphic evolution of the Central European orogens. We gratefully acknowledge the help of the national funding agencies, who have financed much of the research work summarized in this book, and of the Interna tional Geological Correlation Programme (IGCP, project no. 233) which provided and helped to finance the organisational framework. We are indebted to Springer-Verlag for thorough copy-editing and production of this book, and we sincerely appreciate the efforts of all the reviewers whose com ments have greatly helped to improve the quality of this volume. We also thank the various contributors for their diligence and perseverance in manuscript preparation.
Author: B. Marjorie Wilson
Publisher: Geological Society of London
ISBN: 9781862391529
Category : Science
Languages : en
Pages : 514
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Book Description
