Download or read book Toward an Improved Understanding of Intraplate Uplift and Volcanism Geochronology and Geochemistry of Intraplate Volcanic Rocks and Lower Crustal Xenoliths written by Leonard D. Ancuta and published by . This book was released on 2017 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of diffuse intraplate volcanism and 4000 m high topography of the Hangay Mountains in central Mongolia is enigmatic, as it is not explained by or predicted by traditional plate tectonic models. Chapter One presents new whole-rock 40Ar/39Ar ages that range from Holocene to 30 Ma for the Cenozoic volcanic rocks in central Mongolia. The total volume of the Cenozoic volcanic rocks is approximately 1540 km3, but prior to erosion, the volume may have been as high as 2900 km3. Volcanism began to increase gradually in the early Miocene and peaked in the middle Miocene, with a gradual decrease in volume through the Holocene. The low total volumes and the lack of an age progressive hot-spot track rule out the presence of a mantle plume. The long-term gradual increase and subsequent decrease in volcanic output may also rule out delamination. Chapter Two presents the results of a geochemical study to understand the source of the volcanic rocks. Isotopic compositions of the volcanic rocks fall between prevalent mantle (PREMA) and enriched mantle (EM1) and are similar to other Cenozoic basalts from east Asia, though markedly different from the depleted MORB mantle (DMM) isotopic signature of the lithospheric mantle in Mongolia, suggesting the volcanic rocks must be derived from a sub-lithospheric source. A mantle upwelling beneath the region is likely, though the specific cause can not be identified by geochemistry and geochronology alone. In Chapter Three, two-pyroxene granulite lower crustal xenoliths brought to the surface by the Cenozoic volcanism were studied using U-Pb geochronology and geochemistry. U-Pb geochronology indicates the lower crust in central Mongolia began to form by at latest the Permo-Triassic, likely during the formation of the Central Asian Orogenic Belt (CAOB), which is consistent with arc-like geochemical signatures. Recent seismology studies indicate that the high elevations of the Hangay region could be isostatically supported by a thick crust. My new data suggests the lower crust, and by inference the high topography of the Hangay, formed in the Late Paleozoic to Early Mesozoic during the formation of the CAOB, which is significantly older than any other previous estimates.
Download or read book Intraplate Volcanism written by R. Wally Johnson and published by Cambridge University Press. This book was released on 1989-11-24 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study of the young volcanoes of eastern Australia and parts of New Zealand looks at rock types and formation and inclusions of the upper mantle and lower-crustal rocks found in volcanic deposits. It discusses the Earth's crust and the mantle beneath, and the geological evolution in the area over the last 70-80 million years.
Download or read book Geochronology Geochemistry and Isotopic Compositions of the Volcanic Rocks from Oceanic Hawaii and Continental Eifel Intra plate Environments written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Eifel volcanism is part of the Central European Volcanic Province (CEVP) and is located in the Rhenish Massif, close to the Rhine and Leine Grabens. The Quaternary Eifel volcanism appears to be related to a mantle plume activity. However, the causes of the Tertiary Hocheifel volcanism remain debated. We present geochronological, geochemical and isotope data to assess the geotectonic settings of the Tertiary Eifel volcanism. Based on 40Ar/39Ar dating, we were able to identify two periods in the Hocheifel activity: from 43.6 to 39.0 Ma and from 37.5 to 35.0 Ma. We also show that the pre-rifting volcanism in the northernmost Upper Rhine Graben (59 to 47 Ma) closely precede the Hocheifel volcanic activity. In addition, the volcanism propagates from south to north within the older phase of the Hocheifel activity. At the time of Hocheifel volcanism, the tectonic activity in the Hocheifel was controlled by stress field conditions identical to those of the Upper Rhine Graben. Therefore, magma generation in the Hocheifel appears to be caused by decompression due to Middle to Late Eocene extension. Our geochemical data indicate that the Hocheifel magmas were produced by partial melting of a garnet peridotite at 75-90 km depth. We also show that crustal contamination is minor although the magmas erupted through a relatively thick continental lithosphere. Sr, Nd and Pb isotopic compositions suggest that the source of the Hocheifel magmas is a mixing between depleted FOZO or HIMU-like material and enriched EM2-like material. The Tertiary Hocheifel and the Quaternary Eifel lavas appear to have a common enriched end-member. However, the other sources are likely to be distinct. In addition, the Hocheifel lavas share a depleted component with the other Tertiary CEVP lavas. Although the Tertiary Hocheifel and the Quaternary Eifel lavas appear to originate from different sources, the potential involvement of a FOZO-like component would indicate the contribution of deep mantle mate.
Download or read book Volcanism and Evolution of the African Lithosphere written by Luigi Beccaluva and published by Geological Society of America. This book was released on 2011-01-01 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Updates in Volcanology written by Karoly Nemeth and published by BoD – Books on Demand. This book was released on 2016-09-21 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: Updates in Volcanology - From Volcano Modeling to Volcano Geology is a new book that is based on book chapters offered by various authors to provide a snapshot of current trends in volcanological researches. Following a short Introduction, the book consists of three sections, namely, ''Understanding the Volcano System from Petrology, Geophysics to Large Scale Experiments,'' ''Volcanic Eruptions and Their Impact to the Environment,' and ''Volcanism in the Geological Record.'' These sections collect a total of 13 book chapters demonstrating clearly the research activity in volcanology from geophysical aspects of volcanic systems to their geological framework. Each chapter provides a comprehensive summary of their subject's current research directions. This book hence can equally be useful for students and researchers.
Download or read book Cenozoic Volcanism in the Tyrrhenian Sea Region written by Angelo Peccerillo and published by Springer. This book was released on 2016-12-01 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an updated edition of the book by the same author: "Plio-Quaternary volcanism in Italy - Petrology, geochemistry, geodynamics," published in 2005 by Springer. This edition has the same structure as the previous publication, with a general introduction; various chapters dedicated to different volcanic provinces in Italy; and a final chapter on the relationships between magmatism and geodynamics. It includes information that has become available in the last ten years, and new chapters have been added offering detailed discussions of the Oligo-Miocene orogenic volcanism on Sardinia and of some small outcrops of fragmented volcanic rocks occurring in several places of the Apennines. This new edition now covers the entire Tyrrhenian Sea magmatism of the last 40 Ma. Lastly, it includes two appendices: Appendix 1 reports on a comparison between the Tyrrhenian Sea volcanism and the partially coeval magmatism along the Alps and adjoining areas and has the objective of highlighting similarities and difference that can tell us much on geodynamics and magmatism between the converging plates of Europe and Africa. Appendix 2 is an update of the 2005 edition appendix and deals with classification of orogenic rocks with special emphasis on potassic alkaline volcanics.
Download or read book Plio Quaternary Volcanism in Italy written by Angelo Peccerillo and published by Springer Science & Business Media. This book was released on 2005-12-12 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Central-Southern Italy and the Tyrrhenian Sea are the sites of extensive Plio-Quaternary magmatic activity. The rock compositions include crustal anatectic granites and rhyolites, tholeiitic, calc-alkaline, shoshonitic volcanics, and potassic to ultrapotassic and Na-alkaline volcanics. This very wide compositional variation makes Italian magmatism one of the most complex petrological issues, the understanding of which is a challenge for modern petrology and geochemistry. This book summarises the petrological, geochemical and volcanological characteristics of Italian Plio-Quaternary volcanism, and discusses petrogenetic hypotheses and possible geodynamics settings. The book is written for petrologists and geochemists, but fundamental geochemical information is well presented and the use of excessive jargon is avoided, making the book readable to a wide audience of Earth scientists.
Download or read book Volcano Tectonic Processes written by Valerio Acocella and published by Springer Nature. This book was released on 2021-05-11 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volcanoes have terrified and, at the same time, fascinated civilizations for thousands of years. Many aspects of volcanoes, most notably the eruptive processes and the compositional variations of magma, have been widely investigated for several decades and today constitute the core of any volcanology textbook. Nevertheless, in the last two decades, boosted by the availability of volcano monitoring data, there has been an increasing interest in the pre-eruptive processes related to the shallow accumulation and to the transfer of magma approaching the surface, as well as in the resulting structure of volcanoes. These are innovative and essential aspects of modern volcanology and, as driving volcanic unrest, their understanding also improves hazard assessment and eruption forecasting. So far, the significant progress made in unravelling these volcano-tectonic processes has not been supported by a comprehensive overview. This monograph aims at filling this gap, describing the pre-eruptive processes related to the structure, deformation and tectonics of volcanoes, at the local and regional scale, in any tectonic setting. The monograph is organized into three sections (“Fundamentals”, “Magma migration towards the surface” and “The regional perspective”), consisting of thirteen chapters that are lavishly illustrated. The reader is accompanied in a journey within the volcano factory, discovering the processes associated with the shallow accumulation of magma and its transfer towards the surface, how these control the structure of volcanoes and their activity and, ultimately, improve our ability to estimate hazard and forecast eruption. The potential readership includes any academic, researcher and upper undergraduate student interested in volcanology, magma intrusions, structural geology, tectonics, geodesy, as well as geology and geophysics in general.
Download or read book Volcanology written by Ray Cas and published by Springer. This book was released on 2023-08-22 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a substantially updated, revised and extended version of the book Volcanic Successions, published by Cas and Wright back in 1987. Divided into six major parts, it offers comprehensive information on magma properties; fragmentation processes; subaerial and subaqueous lava types and field textures; sub-volcanic intrusions; explosive or pyroclastic eruptions and deposits; surface sedimentary processes; hydrothermal alteration and lithification, and effects on volcanic rock textures; terminology and approaches to describing and mapping volcanic rocks and terrains; geology of volcanoes and facies models; volcanism and tectonic setting; and to conclude, volcanic-hosted resources. It is a highly up-to-date text, presenting a coherent flow of topics, together with excellent visual material to illustrate key points and deposit features. The new authorship team consists of Ray Cas, Guido Giordano and John Wright, all of whom have extensive experience across the complete spectrum of volcanological processes and deposit types discussed in this exciting new book. The authors approach the diversity of products in volcanic terrains as facies, and use facies analysis and interpretation as a means of constructing facies models for different volcanic settings and their resources. The book is intended as a textbook and research reference book for senior undergraduate and graduate students, researchers and professionals alike.
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2005 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characteristics of Hawaiian Volcanoes written by Taeko Jane Takahashi and published by Government Printing Office. This book was released on 2014 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characteristics of Hawaiian Volcanoes establishes a benchmark for the currrent understanding of volcanism in Hawaii, and the articles herein build upon the elegant and pioneering work of Dutton, Jagger, Steams, and many other USGS and academic scientists. Each chapter synthesizes the lessons learned about a specific aspect of volcanism in Hawaii, based largely o continuous observation of eruptive activity and on systematic research into volcanic and earthquake processes during HVO's first 100 years. NOTE: NO FURTHER DISCOUNTS FOR ALREADY REDUCED SALE ITEMS.
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 Volcanism in Antarctica 200 Million Years of Subduction Rifting and Continental Break up written by J.L. Smellie and published by Geological Society of London. This book was released on 2021-06-09 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt: This memoir is the first to review all of Antarctica’s volcanism between 200 million years ago and the Present. The region is still volcanically active. The volume is an amalgamation of in-depth syntheses, which are presented within distinctly different tectonic settings. Each is described in terms of (1) the volcanology and eruptive palaeoenvironments; (2) petrology and origin of magma; and (3) active volcanism, including tephrochronology. Important volcanic episodes include: astonishingly voluminous mafic and felsic volcanic deposits associated with the Jurassic break-up of Gondwana; the construction and progressive demise of a major Jurassic to Present continental arc, including back-arc alkaline basalts and volcanism in a young ensialic marginal basin; Miocene to Pleistocene mafic volcanism associated with post-subduction slab-window formation; numerous Neogene alkaline volcanoes, including the massive Erebus volcano and its persistent phonolitic lava lake, that are widely distributed within and adjacent to one of the world’s major zones of lithospheric extension (the West Antarctic Rift System); and very young ultrapotassic volcanism erupted subglacially and forming a world-wide type example (Gaussberg).
Download or read book Large Igneous Provinces written by John J. Mahoney and published by American Geophysical Union. This book was released on 1997-01-23 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 100. Continental flood basalts, volcanic passive margins, and oceanic plateaus represent the largest known volcanic episodes on our planet, yet they are not easily explained by plate tectonics. Indeed, some are likely to record periods when the outward transfer of material and energy from the Earth's interior operated in a significantly different mode than at present. In recent years, interest in large-scale mafic magmatism has surged as high-precision geochronological, detailed geochemical, and increasingly sophisticated geophysical data have become available for many provinces. However, the sheer amount of recent material, often in the form of detailed collaborative research projects, can overwhelm newcomers to the field and experts alike as the literature continues to grow dramatically. The need for an up-to-date review volume on a sizable subset of the major continental and oceanic flood basalt provinces, termed large igneous provinces, was recognized by the Commission on Large-Volume Basaltic Provinces (International Association of Volcanology and Chemistry of the Earth's Interior), and the co-editors were charged with organizing and implementing such a volume. We hope that this volume will be valuable to researchers and graduate students worldwide, particularly to petrologists, geochemists, geochronologists, geodynamicists, and plate-tectonics specialists; it may also interest planetologists, oceanographers, and atmospheric scientists.
Download or read book Geochemical Expression of Volcanism in an On axis and Intraplate Hotspot written by Dana Lee Desonie and published by . This book was released on 1990 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Pacific Ocean basin is home to a set of hotspots diverse in their eruption rate, duration of volcanism, and basalt chemistry. Pacific hotspots are found in a spectrum of distinct plate tectonic settings, from near a spreading ridge to intraplate. Cobb hotspot, which resulted in formation of the Cobb-Eickelberg seamount (CES) chain, is currently located beneath Axial seamount, on the Juan de Fuca ridge. The Marquesas hotspot, which formed the Marquesas archipelago and, perhaps, older seamounts to the west, is a member of the cluster of hotspots found within French Polynesia, located well away from the nearest spreading ridge. Geochemical and geochronological studies of volcanism at these two hotspots contribute to an understanding of the effect of plate tectonic environment on hotspot volcanism. Cobb hotspot has the temporal but not the isotopic characteristics usually attributed to a mantle plume. The earlier volcanic products of the hotspot show a westward age progression away from the hotspot and a westward increase in the age difference between the seamounts and the crust on which they formed. These results are consistent with movement of the Pacific plate over a fixed Cobb hotspot and encroachment by the westwardly migrating Juan de Fuca ridge. CES lavas are slightly enriched in alkali and incompatible elements relative to those of the Juan de Fuca ridge but they have Sr, Nd, and Pb isotopic compositions virtually identical to those found along the ridge. Cobb hotspot is a stationary upper mantle melting anomaly whose volcanic products have strong mid-ocean ridge basalt affinity. Basaltic lavas from dredge hauls in the Marquesas archipelago decrease in age from northwest to southeast, with the youngest volcanism at a group of seamounts southeast of the island of Fatu Hiva. Tholeiitic and transitional basalts compose the shield of a typical Marquesan volcano; alkalic lavas form a later phase. Tholeiitic and transitional basalts result from variable degrees of melting of a relatively depleted mantle source with pods of incorporated radiogenic-Pb enriched material. Alkalic lavas represent smaller degrees of melting of a radiogenic Sr and Pb enriched mantle source. Volcanism at both hotspots can be explained by variable amounts of entrainment of a heterogeneous upper mantle into a mantle plume of isotopically depleted (Cobb) or enriched (Marquesas) composition.
Download or read book Volcanism and Tectonism Across the Inner Solar System written by T. Platz and published by Geological Society of London. This book was released on 2015-01-05 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volcanism and tectonism are the dominant endogenic means by which planetary surfaces change. This book aims to encompass the broad range in character of volcanism, tectonism, faulting and associated interactions observed on planetary bodies across the inner solar system - a region that includes Mercury, Venus, Earth, the Moon, Mars and asteroids. The diversity and breadth of landforms produced by volcanic and tectonic processes is enormous, and varies across the inner solar system bodies. As a result, the selection of prevailing landforms and their underlying formational processes that are described and highlighted in this volume are but a primer to the expansive field of planetary volcanism and tectonism. This Special Publication features 22 research articles about volcanic and tectonic processes manifest across the inner solar system.
Download or read book Plates Plumes and Planetary Processes written by Gillian R. Foulger and published by Geological Society of America. This book was released on 2007 with total page 1012 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a collection of papers discussing various hypotheses and models of planetary plumes.
