Download or read book The Complexity of Arc Magmatism written by Theresa M. Kayzar and published by . This book was released on 2012 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding crustal modification of magmas in volcanic arcs is a fundamental problem of igneous petrology and geochemistry. This dissertation examines the role of crustal processes including crustal assimilation, magma mixing, magma differentiation, and volatile transport in generating erupted magmas from four volcanic systems in the Kamchatka Volcanic arc: Bezymianny, Klyuchevskoy, Shiveluch, and Karymsky. High-precision Pb isotope data from the Central Kamchatka Depression (CKD) record lower crustal assimilation and magma mixing of less radiogenic crust and melt into the magmas of Bezymianny volcano. Unradiogenic Pb isotope compositions in CKD magmas suggest that lower crustal assimilation occurs to a larger extent beneath the CKD than in other segments of the Kamchatka arc. Klyuchevskoy compositional variations support this argument and also show that the degree of assimilation beneath an individual volcanic center may vary on a decadal timescale. Documented lower crustal assimilation by magmas beneath the CKD modifies uranium-series isotope disequilibrium compositions of CKD magmas. U-series isotopes are the only radioactive isotope system with half-lives useful for understanding the timing of volcanic processes. Constraining the affect of crustal processes that alter U-series compositions is essential to interpret isotope signatures. Chapter 2 of this dissertation shows that lower crustal assimilation and fractional crystallization of high-pressure clinopyroxene modifies U-excess to form Th-xcess compositions. Global documentation of Th-excess reveals a correlation of Th-excess disequilibria with hot lower crustal geologic settings. Th-excess may therefore be an important chemical tracer of lower crustal assimilation. Shallow magma storage and degassing is investigated using (210Pb)/(226Ra) compositions at periodically erupting volcanoes with well-constrained degassing and eruptive histories. Current models that predict (210Pb)/(226Ra) as a function of gas loss do not accurately predict the observed compositions of erupted products in Kamchatka. This paradox has important implications for the timescales of magma storage and degassing in the crust. Chapter 4 of this work is a detailed isotopic study of environmental uranium contamination from an abandoned open-pit mine. Uranium isotope data fingerprint alteration of the mine source and transport of uranium from the mine to sediment in Red Rock Creek on National Forest Service recreational land.
Download or read book Paleo Pacific Plate Subduction Tectonics and Related Magmatism and Mineralization written by Fan Yang and published by Frontiers Media SA. This book was released on 2023-07-31 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Treatise on Geochemistry written by and published by Newnes. This book was released on 2013-10-19 with total page 14787 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensively updated new edition of the widely acclaimed Treatise on Geochemistry has increased its coverage beyond the wide range of geochemical subject areas in the first edition, with five new volumes which include: the history of the atmosphere, geochemistry of mineral deposits, archaeology and anthropology, organic geochemistry and analytical geochemistry. In addition, the original Volume 1 on "Meteorites, Comets, and Planets" was expanded into two separate volumes dealing with meteorites and planets, respectively. These additions increased the number of volumes in the Treatise from 9 to 15 with the index/appendices volume remaining as the last volume (Volume 16). Each of the original volumes was scrutinized by the appropriate volume editors, with respect to necessary revisions as well as additions and deletions. As a result, 27% were republished without major changes, 66% were revised and 126 new chapters were added. In a many-faceted field such as Geochemistry, explaining and understanding how one sub-field relates to another is key. Instructors will find the complete overviews with extensive cross-referencing useful additions to their course packs and students will benefit from the contextual organization of the subject matter Six new volumes added and 66% updated from 1st edition. The Editors of this work have taken every measure to include the many suggestions received from readers and ensure comprehensiveness of coverage and added value in this 2nd edition The esteemed Board of Volume Editors and Editors-in-Chief worked cohesively to ensure a uniform and consistent approach to the content, which is an amazing accomplishment for a 15-volume work (16 volumes including index volume)!
Download or read book Arc Volcanism written by Shigeo Aramaki and published by Elsevier Publishing Company. This book was released on 1983 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Origin of Arcs written by F.-C. Wezel and published by Elsevier. This book was released on 2013-10-22 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains a collection of papers presented as distinguished guest lectures at the International Conference on ``The Origin of Arcs'' held at the University of Urbino in September 1986, under the joint sponsorship of the European Union of Geosciences and the Italian Geological Society. The workshop on island and mountain arcs has been organized with the aim of increasing our understanding of the intrinsic nature of orogenic and post-orogenic processes, on the basis of empiric factual data, rather than particular theoretic models. Quite often a trivial piece of field data appears to bear much more weight than many fascinating hypotheses put forward by the human mind. This seems to be much more valid in geology, where a special method is necessitated by the particular nature of the geological phenomena and the time concept. Every general law deduced should be rooted in the study of the earth's development in geological time. It is the editor's opinion that there must first be an inductive picture by means of geological methods and then it must be interpreted by geophysicists in the light of physical laws. The geological method must serve, besides, to test the historical credibility of geophysical theories. It is clear that these two methods, the geological-historical one and the geophysical one, must be complementary and the one must not substitute the other. Since the problem of the structure and origin of arcs is open to several solutions, different factors being still unexplained, all correctly deduced opinions are considered by the editor. The contributors to this pre-conference volume have been asked to present essential geological results, as concrete as possible, on some basic problems, such as: Are the island and mountain arcs primary or induced features? How have these orogenic festoons developed into their similar regular shapes? What are the relationships between "primary" active arcs and "secondary" mountain arcs? What is the dominant deformational factor in the bulging of the arc? What is the real nature and tectonic significance of the Benioff zone? These papers have been grouped into five more or less natural sections, of which three are defined on the basis of geography. But of course several range broadly and the classification serves only to channel the discussion in a practical way.
Download or read book Backarc Basins written by Brian Taylor and published by Springer Science & Business Media. This book was released on 1995-05-31 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experts in the field offer the first comprehensive review of the tectonics and magmatism of backarc basins, covering their initial rift stage to mature spreading. Complete with numerous illustrations, each of the twelve chapters focuses on a young, active backarc basin of the circum-Pacific-where volcano-tectonic processes are best studied because of their activity. Key themes in this volume include volcano-tectonics setting; cause and location; rift magmas; and hydrothermal activity. Researchers also present models of the dynamic processes occurring in backarc basins.
Download or read book Anatomy of an Orogen The Apennines and Adjacent Mediterranean Basins written by F. Vai and published by Springer. This book was released on 2013-12-21 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book in English reviewing and updating the geology of the whole Apennines, one of the recent most uplifted mountains in the world. The Apennines are the place from which Steno (1669) first stated the principles of geology. The Apennines also represent amongst others, the finding/testing sites of processes and products like volcanic eruptions, earthquakes, olistostromes and mélanges (argille scagliose), salinity crisis, geothermal fluids, thrust-top basins, and turbidites (first represented in a famous Leonardo's painting). As such, the Apennines are a testing and learning ground readily accessible and rich of any type of field data. A growing literature is available most of which is not published in widely available journals. The objective of the book is to provide a synthesis of current data and ideas on the Apennines, for the most part simply written and suitable for an international audience. However, sufficient details and in-depth analyses of the various complex settings have been presented to make this material useful to professional scholars and to students of senior university courses.
Download or read book The Role of Volatiles in the Genesis Evolution and Eruption of Arc Magmas written by G.F. Zellmer and published by Geological Society of London. This book was released on 2015-03-17 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subduction zone volatile cycle is key to understanding the petrogenesis, transport, storage and eruption of arc magmas. Volatiles control the flux of slab components into the mantle wedge, are responsible for melt generation through lowering the solidi of mantle materials and influence the crystallizing phase assemblages in the overriding crust. Further, the rates and extents of degassing during magma storage and decompression affect magma rheology, ultimately control eruption style and have consequences for the environmental impact of explosive arc volcanism. This book highlights recent progress in constraining the role of volatiles in magmatic processes. Individual book sections are devoted to tracing volatiles from the subducting slab to the overriding crust, their role in subvolcanic processes and eruption triggering, as well as magmatic-hydrothermal systems and volcanic degassing. For the first time, all aspects of the overarching theme of volatile cycling are covered in detail within a single volume.
Download or read book Magmatism and Geodynamics written by O A Bagatikov and published by CRC Press. This book was released on 2020-07-16 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnatism is the only true endogenic process for generating new material on the Earth's surface. Obviously, magmatism and tectonic movements are reflections of geodynamics, that is, physical processes which occur in deep-seated environments. What are the interrelationships between magmatism and tectronics? How did the character of terrestrial magmatism change through time and are there any irregularities in this process?
Download or read book Formation and Applications of the Sedimentary Record in Arc Collision Zones written by Amy E. Draut and published by Geological Society of America. This book was released on 2008-01-01 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Inspired by a GSA Penrose Conference held in 2005 (cosponsored by the International Association of Sedimentologists and the British Sedimentological Research Group), the 17 papers in this volume explore sedimentary environments in arc collision zones and their utility in recording the evolution of modern and ancient convergent margins. The first set of papers in the collection focuses on formation and evolution of the sedimentary record in arc settings and arc collision zones, concentrating on modern intra-oceanic examples. Papers include studies of flexural modeling and factors that affect development of siliciclastic and carbonate deposits around modern arcs. The second half of the volume presents new applications of arc sedimentary records. These relate primarily to constraining tectonic events in the evolution of arc systems, but also concern the links among tectonic uplift, collision, and geomorphic and climatic feedback mechanisms in arc collision zones."--Publisher's website.
Download or read book Minerals Inclusions And Volcanic Processes written by Keith D. Putirka and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 69 of Reviews in Mineralogy and Geochemistry covers the fundamental issues of volcanology: At what depths are eruptions triggered, and over what time scales? Where and why do magmas coalesce before ascent? If magmas stagnate for thousands of years, what forces are responsible for initiating final ascent, or the degassing processes that accelerate upward motion? To the extent that we can answer these questions, we move towards formulating tests of mechanistic models of volcanic eruptions (e.g., Wilson, 1980; Slezin, 2003; Scandone et al., 2007), and hypotheses of the tectonic controls on magma transport (e.g., ten Brink and Brocher, 1987; Takada, 1994; Putirka and Busby, 2007). Our goal, in part, is to review how minerals can be used to understand volcanic systems and the processes that shape them; we also hope that this work will spur new and integrated studies of volcanic systems.
Download or read book The Andes written by Onno Oncken and published by Springer Science & Business Media. This book was released on 2006-11-22 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the first comprehensive overview of a complete subduction orogen, the Andes. To date the results provide the densest and most highly resolved geophysical image of an active subduction orogen.
Download or read book New Zealand Journal of Geology and Geophysics written by and published by . This book was released on 1979 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mantle Metasomatism and Alkaline Magmatism written by Ellen Mullen Morris and published by Geological Society of America. This book was released on 1987-01-01 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Excursions in Southern California written by Brian Kraatz and published by Geological Society of America. This book was released on 2017-08-28 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This guidebook volume for the 2016 GSA Cordilleran Section Meeting, which was held in Ontario, California, explores varied geological features of southern California and Nevada, including the Mojave Desert and Tule Springs Fossil Beds National Monument"--
Download or read book Magma Redox Geochemistry written by Roberto Moretti and published by John Wiley & Sons. This book was released on 2021-09-14 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the many facets of redox exchanges that drive magma's behavior and evolution, from the origin of the Earth until today The redox state is one of the master variables behind the Earth's forming processes, which at depth concern magma as the major transport agent. Understanding redox exchanges in magmas is pivotal for reconstructing the history and compositional make-up of our planet, for exploring its mineral resources, and for monitoring and forecasting volcanic activity. Magma Redox Geochemistry describes the multiple facets of redox reactions in the magmatic realm and presents experimental results, theoretical approaches, and unconventional and novel techniques. Volume highlights include: Redox state and oxygen fugacity: so close, so far Redox processes from Earth’s accretion to global geodynamics Redox evolution from the magma source to volcanic emissions Redox characterization of elements and their isotopes The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.
Download or read book Precambrian Geology of China written by Mingguo Zhai and published by Springer. This book was released on 2015-08-11 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first contribution to the overview of Precambrian geology of China. It covers Precambrian geology of the North China Craton, the South China Craton and the Tarim Craton, as well as other smaller blocks in the Chinese orogenic belts. It provides systematic concepts of the Chinese paleo-continents and incorporates the most up-to-date achievements. Edited by many of the active researchers working at the forefront of the related fields, it contributes greatly to the international Precambrian geology community and would be of interest to geoscientists working in the research field of geology of China and Precambrian geodynamics.
