Continental Magmatism By Shear Heating In Process Zones
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Continental Magmatism By Shear Heating In Process Zones
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Author : Maud Devès
language : en
Publisher:
Release Date : 2010
Continental Magmatism By Shear Heating In Process Zones written by Maud Devès and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Crustal Deformation During Arc Flare Up Magmatism Field And Microstructural Analysis Of A Mid Crustal Melt Enhanced Shear Zone
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Author : John Bennett Gilbert
language : en
Publisher:
Release Date : 2017
Crustal Deformation During Arc Flare Up Magmatism Field And Microstructural Analysis Of A Mid Crustal Melt Enhanced Shear Zone written by John Bennett Gilbert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Geology categories.
This study combines structural field data with microstructural observations in an analysis of a mid-crustal shear zone related to the emplacement of the Misty pluton during a high-flux magmatic event in Northern Fiordland, New Zealand. These high-flux magmatic events transport massive amounts of heat and material as they develop along accretionary continental margins, and represent a primary source of continental crust. Fiordland, New Zealand possesses, perhaps, the most extensive middle and lower crustal exposure of these systems on earth. Therefore, this study area provides a significant opportunity to understand processes of continental crust formation in the mid-crust and how these events relate to the broader construction of continents. Herein, I document the four-stage geologic history of the Cozette Burn field area. Pre-existing structures along the Gondwana accretionary margin hosted a regional flare-up magmatic event that produced the Misty pluton and several other large plutons of the West Fiordland Orthogneiss (WFO). This study primarily focuses on the mid-crustal emplacement of the Misty pluton during oblique convergence along the accretionary margin, forming the upper-amphibolite facies Misty Shear Zone (MSZ). The exposures of the MSZ within the Cozette Burn preserve rare structural relationships between host rock and the intrusive Misty pluton. Together, these structures developed during end-stage contractional tectonics that constructed a long-lived (~270+ Ma) composite batholith. Heterogeneous ductile shearing defines the MSZ, with microstructural evidence indicating an interplay of high-temperature crystal plastic deformation along with partial melting of host rock and melt channeling. This resulted in focused, melt-assisted shearing under regional transpressive deformation. These accommodative processes provided an efficient mechanism for moving heat, fluids and magma sourced from the lower crust/mantle boundary into the mid-crust during 15-25 km of crustal thickening related to arc flare-up magmatism. This flare up magmatism and MSZ formation occurred during the final stages of crustal thickening along Gondwana continental margin. High-strain, mylonitic- ultramylonitic shear zones developed in a later phase of deformation, cutting MSZ fabrics near contacts between the Misty pluton and host rock. These more localized shear zones can be attributed to either accommodation of localized melt-pressure buildup or the shift to extensional tectonics. Brittle faulting cut these structures with oblique-thrust in the Tertiary. These mid-crustal structures carry economic relevance: thickened-crust events along accretionary continental margins produce deep-crustal sourced, metal-bearing magmas that are transferred into mid-crust prior to their hydrothermal emplacement as ore deposits in the upper crust. The lasting influence of these processes warrants consideration when assessing continental crust architecture at all scales.
Magmatic Systems
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Author : Michael P. Ryan
language : en
Publisher: Academic Press
Release Date : 1994-08-26
Magmatic Systems written by Michael P. Ryan and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-08-26 with Science categories.
With its integrated and cohesive coverage of the current research, Magmatic Systems skillfully explores the physical processes, mechanics, and dynamics of volcanism. The text utilizes a synthesized perspective--theoretical, experimental, and observational--to address the powerful regulatory mechanisms controlling the movement of melts and cooling, with emphasis on mantle plumes, mid-ocean ridges, and intraplate magmatism. Further coverage of subduction zone magmatism includes: Fluid mechanics of mixed magma migration Internal structure of active systems Grain-scale melt flow Rheology of partial melts Numerical simulation of porous media melt migration Nonlinear (chaotic and fractal) processes in magma transport In all, Magmatic Systems will prove invaluable reading to those in search of an interdisciplinary perspective on this active topic. Key Features * Fluid mechanics of magma migration from surface region to eruption site * Internal structure of active magmatic systems * Grain-scale melt flow in mantle plumes and beneath mid-ocean ridges * Physics of magmatic systems and magma dynamics
Granite From Segregation Of Melt To Emplacement Fabrics
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Author : J.-L. Bouchez
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Granite From Segregation Of Melt To Emplacement Fabrics written by J.-L. Bouchez and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
viii debate of those earlier days has been beautifully summarized by H. H. Read in his famous "Granite Controversy" (1957). Read's formulation of the controversy occurred at the time when geochemistry was as a new and powerful tool. The new techniques opened era during which emerging an granites were considered mainly from this new viewpoint. Geochemical signatures have shown that mantle and crustal origins for granites were both possible, but the debate on how and why granites are emplaced did not progress much. Meanwhile, structural geology was essentially geometrical and mechanistic. In the early 70's, the structural approach began to widen to include solid state physics and fluid dynamics. Detailed structural maps of granitic bodies were again published, mainly in France, and analysed in terms of magmatic and plastic flow. The senior editor of this volume and his students deserve much of the credit for this new development. Via microstructural and petrofabric studies, they were able to discriminate between strain in the presence of residual melt or in the solid-state, and, by systematically measuring magnetic fabrics (AMS), they have been able to map magmatic foliations and lineations in ever finer detail, using the internal markers within granites coming from different tectonic environments. The traditional debate has been shifted anew. The burning question now seems to be how the necessary, large-scale or local, crustal extension required for granite emplacement can be obtained.
Atlantic Rifts And Continental Margins
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Author : Webster Mohriak
language : en
Publisher: American Geophysical Union
Release Date : 2000-01-10
Atlantic Rifts And Continental Margins written by Webster Mohriak and has been published by American Geophysical Union this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-01-10 with Science categories.
This reference on the geology and geophysics of continental margins contains a total of 15 papers developed from a session of the Fifth International Congress of the Brazilian Geophysical Society held in Sao Paulo, Brazil in 1997, as well as a number of other contributions. Subjects include the roots of the southeastern continental margin of Brazil, the mosaic of Terranes in central Europe, the evolution of the Angolan passive margin; geological and geophysical interpretation of the San Julian Basin offshore Argentina; and the tectonic evolution of the equatorial South Atlantic. Of likely interest to academic geoscientists working in basin analysis and those engaged in petroleum exploration. Member price, $52.50. Annotation copyrighted by Book News, Inc., Portland, OR.
Meso Cenozoic Brazilian Offshore Magmatism
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Author : Anderson Costa Dos Santos
language : en
Publisher: Academic Press
Release Date : 2021-12-03
Meso Cenozoic Brazilian Offshore Magmatism written by Anderson Costa Dos Santos and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-12-03 with Science categories.
Meso-Cenozoic Brazilian Offshore Magmatism: Geochemistry, Petrology and Tectonics presents detailed studies from different points-of-view on the geological—particularly magmatic—evolution of the Brazilian and South Atlantic Ocean offshore areas. This comprehensive book on geological events will help readers understand the holistic evolution of the area across geographical boundaries. Each chapter consists of an introduction, regional and local geology, methods, results, discussions, conclusions and supplementary material related to the geological development in island and seamounts in the Brazilian Platform and seafloor. Integrates independent studies and research of the Brazilian offshore magmatism and tectonics into a single book Includes new seamount and island data that was previously unavailable to the public Introduces case studies to provide real-world examples of volcanism and scientific evolution
Ductile Shear Zones
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Author : Soumyajit Mukherjee
language : en
Publisher: John Wiley & Sons
Release Date : 2015-12-21
Ductile Shear Zones written by Soumyajit Mukherjee and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-12-21 with Science categories.
The elucidation of the mechanisms and kinematics of shear zone deformation, at both local and regional scales, is the subject of a great deal of interest to scientists in the hydrocarbon industry, in seismology, and in structural geology more generally. This book comprises a collection of five theoretical and twelve regional contributions to the subject from a number of leading researchers in the field, with particular emphasis on work carried out in the Indian subcontinent. The book will be invaluable to advances students and researchers involved in the kinematics of shear.
Himalayan Tectonics
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Author : P.J. Treloar
language : en
Publisher: Geological Society of London
Release Date : 2019-10-08
Himalayan Tectonics written by P.J. Treloar and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-08 with Science categories.
The Himalaya–Karakoram–Tibet mountain belt resulted from Cenozoic collision of India and Asia and is frequently used as the type example of a continental collision orogenic belt. The last quarter of a century has seen the publication of a remarkably detailed dataset relevant to the evolution of this belt. Detailed fieldwork backed up by state-of-the-art structural analysis, geochemistry, mineral chemistry, igneous and metamorphic petrology, isotope chemistry, sedimentology and geophysics produced a wide-ranging archive of data-rich scientific papers. The rationale for this book is to provide a coherent overview of these datasets in addressing the evolution of the mountain ranges we see today. This volume comprises 21 specially invited review papers on the Himalaya, Kohistan arc, Tibet, the Karakoram and Pamir ranges. These papers span the history of Himalayan research, chronology of the collision, stratigraphy, magmatic and metamorphic processes, structural geology and tectonics, seismicity, geophysics, and the evolution of the Indian monsoon. This landmark set of papers should underpin the next 25 years of Himalayan research.
Sedimentary Basins And Crustal Processes At Continental Margins
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Author : G.M. Gibson
language : en
Publisher: Geological Society of London
Release Date : 2015-10-19
Sedimentary Basins And Crustal Processes At Continental Margins written by G.M. Gibson and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-10-19 with Science categories.
Continental margins and their fossilized analogues are important repositories of natural resources. With better processing techniques and increased availability of high-resolution seismic and potential field data, imaging of present-day continental margins and their embedded sedimentary basins has reached unprecedented levels of refinement and definition, as illustrated by examples described in this volume. This, in turn, has led to greatly improved geological, geodynamic and numerical models for the crustal and mantle processes involved in continental margin formation from the initial stages of rifting through continental rupture and break-up to development of a new ocean basin. Further informing these models, and contributing to a better understanding of the features imaged in the seismic and potential field data, are observations made on fossilized fragments of exhumed subcontinental mantle lithosphere and ocean–continent transition zones preserved in ophiolites and orogenic belts of both Palaeozoic and Mesozoic age from several different continents, including Europe, South Asia and Australasia.
Channel Flow Ductile Extrusion And Exhumation In Continental Collision Zones
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Author : Richard D. Law
language : en
Publisher: Geological Society of London
Release Date : 2006
Channel Flow Ductile Extrusion And Exhumation In Continental Collision Zones written by Richard D. Law and has been published by Geological Society of London this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
This volume includes sections on: Evolution of ideas on channel flow and ductile extrusion in the Himalaya-Tibetan Plateau system; Modeling channel flow and ductile extrusion processes; Geological constraints on channel flow and ductile extrusion as an important orogenic process in the Himalaya-Tibetan Plateau, the Hellenides and Appalachians, and the Canadian Cordillera.