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Author : Stephen W. Moss
Publisher :
ISBN 13 :
Total Pages : 254 pages
Book Rating : 4.:/5 (49 download)
Download or read book Magma Mingling as a Trigger of Explosive Silicic Volcanism? written by Stephen W. Moss and published by . This book was released on 2001 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Diego Perugini
Publisher : Springer Nature
ISBN 13 : 303081811X
Total Pages : 169 pages
Book Rating : 4.0/5 (38 download)
Download or read book The Mixing of Magmas written by Diego Perugini and published by Springer Nature. This book was released on 2021-09-24 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a common theoretical and practical basis to the multifaceted nature of magma mixing. This process represents a fundamental phenomenon both in the evolution of igneous rocks and in triggering explosive volcanic eruptions. The topic is attacked surgically merging field evidence, numerical models, and experiments in order to draw the most complete picture about this natural process. Arguments are discussed in the light of Chaos Theory and Fractal Geometry as new tools to understand the role of magma mixing as a fundamental petrological and volcanological process. The book is intended to be a source of information and a stimulus for new ideas in students, young and possibly more experienced researches.
Author : Charlotte Devitre
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Magmatic Drivers of Explosive Volcanism written by Charlotte Devitre and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explosive volcanic eruptions can severely affect the safety and survival of human populations. For this reason, studying the factors that play a role in modulating the explosivity of volcanic eruptions, though difficult, is of utmost importance. These parameters interplay with each other and may include magmatic factors like magma composition and mixing, pre-eruptive volatile content (CO2 and H2O), volatile solubility and exsolution, viscosity and temperature or external factors such as crustal properties, tectonic regime and stress fields, conduit, and vent geometry, as well as decompression rates. Magma recharge and mixing can be a trigger for explosive eruptions due to stark contrasts in density, viscosity, composition, and temperature and which can result in sudden exsolution of dissolved volatiles. Meanwhile, volatile species such as CO2 and H2O play particularly important roles in driving the ascent of magmas towards the surface, controlling the explosivity of volcanic eruptions and ensuring the viability of life on Earth. Volatiles can be challenging to study as magmas degas upon ascent and the record of pre-eruptive volatiles can often be lost. However, crystals growing from magmas can trap fluid and melt inclusions (MI), which preserve a record of pre and syn-eruptive volatile evolution from ascent to eruption. Though their value has long been proven, there remains a multiplicity of challenges associated with MI studies, which when left unaddressed, can yield analyses with uncertainties significant enough to question their validity. Here, I approach three central issues to MI studies, propose new methods to address them and apply these methods to the study of mafic explosive intraplate eruptions at Fogo volcano in Cabo Verde. Additionally, I investigate the role of magma mixing in triggering of explosive eruptions at Turrialba volcano, Costa Rica. In Chapter 1, our chemical analyses of fresh glasses and minerals from the explosive eruptions of 2016-2017 at Turrialba volcano, in Costa Rica, indicated evidence for pervasive two-stage chaotic mixing of mafic to rhyolitic magmas, likely linked to the increased explosivity of these events. In Chapter 2, we present a novel high-precision and high-accuracy fluid density calibration apparatus for Raman Spectroscopy permitting high-quality measurements of CO2 in fluid and MI vapor bubbles, including those with bulk densities in the miscibility gap at room temperature. \In Chapter 3, we present an in-depth analysis of the effects of laser heating on measurements of MI vapor bubbles containing CO2 as liquid and vapor hosted in olivine and the pitfalls of failing to identify the presence of multi-phase CO2 in them. Finally, in Chapter 4, we apply our new Raman methods to the study of three mafic explosive intraplate eruptions from Pico do Fogo volcano in Cabo Verde and explore the role of CO2 in driving the ascent of mafic intraplate magmas from the mantle. We also use X-Ray Computed Tomography on MIs to address the third critical aspect of MI studies that is often the largest source of error: MI volumes.
Author : Jennifer Susan Gilbert
Publisher : Geological Society of London
ISBN 13 : 9781862390201
Total Pages : 200 pages
Book Rating : 4.3/5 (92 download)
Download or read book The Physics of Explosive Volcanic Eruptions written by Jennifer Susan Gilbert and published by Geological Society of London. This book was released on 1998 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Physics of Explosive Volcanic Eruptions includes seven review papers that outline our current understanding of several aspects of the physical processes affecting magma during volcanic eruptions. An introductory chapter highlights research areas where our understanding is incomplete, or even completely lacking, and where work needs advancing if our knowledge of volcanic processes is to be substantially improved. The book covers topics on the physical properties of silicic magma, vesiculation processes, conduit flow and fragmentation, gas loss from magmas during eruption, models of volcanic eruption columns, tephra dispersal and pyroclastic density currents.
Author : Haraldur Sigurdsson
Publisher : Elsevier
ISBN 13 : 0123859395
Total Pages : 1447 pages
Book Rating : 4.1/5 (238 download)
Download or read book The Encyclopedia of Volcanoes written by Haraldur Sigurdsson and published by Elsevier. This book was released on 2015-03-06 with total page 1447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volcanoes are unquestionably one of the most spectacular and awe-inspiring features of the physical world. Our paradoxical fascination with them stems from their majestic beauty and powerful, sometimes deadly, destructiveness. Notwithstanding the tremendous advances in volcanology since ancient times, some of the mystery surrounding volcanic eruptions remains today. The Encyclopedia of Volcanoes summarizes our present knowledge of volcanoes; it provides a comprehensive source of information on the causes of volcanic eruptions and both the destructive and beneficial effects. The early chapters focus on the science of volcanism (melting of source rocks, ascent of magma, eruption processes, extraterrestrial volcanism, etc.). Later chapters discuss human interface with volcanoes, including the history of volcanology, geothermal energy resources, interaction with the oceans and atmosphere, health aspects of volcanism, mitigation of volcanic disasters, post-eruption ecology, and the impact of eruptions on organismal biodiversity. - Provides the only comprehensive reference work to cover all aspects of volcanology - Written by nearly 100 world experts in volcanology - Explores an integrated transition from the physical process of eruptions through hazards and risk, to the social face of volcanism, with an emphasis on how volcanoes have influenced and shaped society - Presents hundreds of color photographs, maps, charts and illustrations making this an aesthetically appealing reference - Glossary of 3,000 key terms with definitions of all key vocabulary items in the field is included
Author : Francesco Vetere
Publisher : John Wiley & Sons
ISBN 13 : 1119521130
Total Pages : 224 pages
Book Rating : 4.1/5 (195 download)
Download or read book Dynamic Magma Evolution written by Francesco Vetere and published by John Wiley & Sons. This book was released on 2021-01-07 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the complex physico-chemical processes involved in active volcanism and dynamic magmatism Understanding the magmatic processes responsible for the chemical and textural signatures of volcanic products and igneous rocks is crucial for monitoring, forecasting, and mitigating the impacts of volcanic activity. Dynamic Magma Evolution is a compilation of recent geochemical, petrological, physical, and thermodynamic studies. It combines field research, experimental results, theoretical approaches, unconventional and novel techniques, and computational modeling to present the latest developments in the field. Volume highlights include: Crystallization and degassing processes in magmatic environments Bubble and mineral nucleation and growth induced by cooling and decompression Kinetic processes during magma ascent to the surface Magma mixing, mingling, and recharge dynamics Geo-speedometer measurement of volcanic events Changes in magma rheology induced by mineral and volatile content 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.
Author : Amanda N. Lindoo
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (1 download)
Download or read book Causes and Consequences of Coupled Crystallization and Vesiculation in Ascending Mafic Magmas written by Amanda N. Lindoo and published by . This book was released on 2017 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transitions in eruptive style and eruption intensity in mafic magmas are poorly understood. While silicic systems are the most researched and publicized due to their explosive character, mafic volcanoes remain the dominant form of volcanism on the earth. Eruptions are typically effusive, but changes in flow behavior can result in explosive, ash generating episodes. The efficiency of volatiles to degas from an ascending magma greatly influences eruption style. It is well known that volatile exsolution in magmas is a primary driving force for volcanic eruptions, however the roles vesicles and syn-eruptive crystallization play in eruption dynamics are poorly understood. Permeability development, which occurs when gas bubbles within a rising magma form connected pathways, has been suspected to influence eruption style and intensity. Numerous investigations on natural eruptive products, experimental samples, and analog experiments have extended the understanding of permeability development and fragmentation processes. However, these studies have focused on silicic, high viscosity, crystal-poor magmas. Little progress has been made in understanding fragmentation mechanisms in mafic or alkali magmas. Mafic systems involve lower viscosity magmas that often form small crystals, also known as microlites, during ascent. Because the merging of bubbles in magma is mitigated by melt viscosity, it is predicted that permeability development in mafic magma will occur at lower bubble volume fractions than in silicic magma. However, no study has been performed on experimental samples to provide evidence for this hypothesis. Furthermore, it is unknown how microlites affect the degassing process in terms of facilitating or hindering permeability development. This thesis employs experimental petrology to: 1) experimentally observe how melt viscosity alone affects permeability development, 2) Understand the effects of syn-eruptive crystallization in vesiculating mafic magmas and synergizes these results to 3) relate experimental findings to the 2008 eruption of Kasatochi volcano.
Author : Joachim Gottsmann
Publisher : Springer
ISBN 13 : 331958412X
Total Pages : 313 pages
Book Rating : 4.3/5 (195 download)
Download or read book Volcanic Unrest written by Joachim Gottsmann and published by Springer. This book was released on 2018-12-18 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book summarizes the findings of the VUELCO project, a multi-disciplinary and cross-boundary research funded by the European Commission's 7th framework program. It comprises four broad topics: 1. The global significance of volcanic unrest 2. Geophysical and geochemical fingerprints of unrest and precursory activity 3. Magma dynamics leading to unrest phenomena 4. Bridging the gap between science and decision-making Volcanic unrest is a complex multi-hazard phenomenon. The fact that unrest may, or may not lead to an imminent eruption contributes significant uncertainty to short-term volcanic hazard and risk assessment. Although it is reasonable to assume that all eruptions are associated with precursory activity of some sort, the understanding of the causative links between subsurface processes, resulting unrest signals and imminent eruption is incomplete. When a volcano evolves from dormancy into a phase of unrest, important scientific, political and social questions need to be addressed. This book is aimed at graduate students, researchers of volcanic phenomena, professionals in volcanic hazard and risk assessment, observatory personnel, as well as emergency managers who wish to learn about the complex nature of volcanic unrest and how to utilize new findings to deal with unrest phenomena at scientific and emergency managing levels. This book is open access under a CC BY license.
Author : Brett B. Carr
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (97 download)
Download or read book Transitions in Eruption Style at Silicic Volcanoes written by Brett B. Carr and published by . This book was released on 2016 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silicic volcanoes produce many styles of activity over a range of timescales. Eruptions vary from slow effusion of viscous lava over many years to violent explosions lasting several hours. Hazards from these eruptions can be far-reaching and persistent, and are compounded by the dense populations often surrounding active volcanoes. I apply and develop satellite and ground-based remote sensing techniques to document eruptions at Merapi and Sinabung Volcanoes in Indonesia. I use numerical models of volcanic activity in combination with my observational data to describe the processes driving different eruption styles, including lava dome growth and collapse, lava flow emplacement, and transitions between effusive and explosive activity. Both effusive and explosive eruptions have occurred recently at Merapi volcano. I use satellite thermal images to identify variations during the 2006 effusive eruption and a numerical model of magma ascent to explain the mechanisms that controlled those variations. I show that a nearby tectonic earthquake may have triggered the peak phase of the eruption by increasing the overpressure and bubble content of the magma and that the frequency of pyroclastic flows is correlated with eruption rate. In 2010, Merapi erupted explosively but also shifted between rapid dome-building and explosive phases. I explain these variations by the heterogeneous addition of CO2 to the melt from bedrock under conditions favorable to transitions between effusive and explosive styles. At Sinabung, I use photogrammetry and satellite images to describe the emplacement of a viscous lava flow. I calculate the flow volume (0.1 km3) and average effusion rate (4.4 m3 s-1) and identify active regions of collapse and advance. Advance rate was controlled by the effusion rate and the flows yield strength. Pyroclastic flow activity was initially correlated to the decreasing flow advance rate, but was later affected by the underlying topography as the flow inflated and collapsed near the vent, leading to renewed pyroclastic flow activity. This work describes previously poorly understood mechanisms of silicic lava emplacement, including multiple causes of pyroclastic flows, and improves the understanding, monitoring capability, and hazard assessment of silicic volcanic eruptions.
Author : Francesco Vetere
Publisher : John Wiley & Sons
ISBN 13 : 1119521130
Total Pages : 224 pages
Book Rating : 4.1/5 (195 download)
Download or read book Dynamic Magma Evolution written by Francesco Vetere and published by John Wiley & Sons. This book was released on 2021-01-07 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores the complex physico-chemical processes involved in active volcanism and dynamic magmatism Understanding the magmatic processes responsible for the chemical and textural signatures of volcanic products and igneous rocks is crucial for monitoring, forecasting, and mitigating the impacts of volcanic activity. Dynamic Magma Evolution is a compilation of recent geochemical, petrological, physical, and thermodynamic studies. It combines field research, experimental results, theoretical approaches, unconventional and novel techniques, and computational modeling to present the latest developments in the field. Volume highlights include: Crystallization and degassing processes in magmatic environments Bubble and mineral nucleation and growth induced by cooling and decompression Kinetic processes during magma ascent to the surface Magma mixing, mingling, and recharge dynamics Geo-speedometer measurement of volcanic events Changes in magma rheology induced by mineral and volatile content 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.
Author : Giovanni Sosa Ceballos
Publisher :
ISBN 13 :
Total Pages : 421 pages
Book Rating : 4.:/5 (755 download)
Download or read book Evolution of Plinian Magmas from Popocatépetl Volcano, México written by Giovanni Sosa Ceballos and published by . This book was released on 2011 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fractional crystallization, magma mixing, assimilation of continental crust, and how those processes modify volatile budgets, control the evolution of magma. As a consequence, the understanding of these processes, their magnitudes, and timescales is critical for interpreting ancient magma systems, their eruptions, and the potential future volcanic activity. In this dissertation I present the results of three projects. The first explores how magmatic processes affect magma reservoirs and eruption dynamics. The second explores where in the storage system and how often these processes occur. The third explores how volatile budgets are modified by processes such as crystallization, mixing, and assimilation. Volcán Popocatépetl (central México) erupted ~14100 14C yr BP producing the Tutti Frutti Plinian Eruption (TFPE). The eruption tapped two different silicic magmas that mixed just prior and during the eruption. The influx of mass and volatiles generated during the mixing of both magmas overpressured the reservoir, which was weakened at the top. The weakened reservoir relaxed while magma was tapped and collapsed to form a caldera at the surface. Although it is known that fractional crystallization, mixing, and assimilation can greatly modify magmas, the frequency and intensity of these events is not known. I investigated the magmatic processes responsible for the evolution of magmas erupted during five Plinian events of Popocatépetl volcano. Results show that during the last 23 ky magma was stored in two different zones, and was variably modified by replenishments of mafic magma. Interestingly, little evidence for large mafic inputs triggering explosive eruptions was found. Each of these processes alters the abundances of volatiles and introduces different types of volatiles to the system. Hence, the volatile budget of magma can have a rich and complex history. To investigate how volatile budgets evolve in active magma systems, I analyzed the abundances of volatiles (H2O, CO2, F, Cl, and S) in numerous glass inclusions trapped in phenocrysts. Results show that the magmas that produced the last five Plinian eruptions at Popocatépetl volcano evolved by crystallization and magma mixing, assimilation of the local carbonate basement is not chemically appreciable. Mixing with mafic magmas added substantial CO2 and S to the system, dewatered the magma, yet produced little change in the F contents of the magmas.
Author : John P. Lockwood
Publisher : John Wiley & Sons
ISBN 13 : 1118687949
Total Pages : 677 pages
Book Rating : 4.1/5 (186 download)
Download or read book Volcanoes written by John P. Lockwood and published by John Wiley & Sons. This book was released on 2013-04-26 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volcanoes are essential elements in the delicate global balance of elemental forces that govern both the dynamic evolution of the Earth and the nature of Life itself. Without volcanic activity, life as we know it would not exist on our planet. Although beautiful to behold, volcanoes are also potentially destructive, and understanding their nature is critical to prevent major loss of life in the future. Richly illustrated with over 300 original color photographs and diagrams the book is written in an informal manner, with minimum use of jargon, and relies heavily on first-person, eye-witness accounts of eruptive activity at both "red" (effusive) and "grey" (explosive) volcanoes to illustrate the full spectrum of volcanic processes and their products. Decades of teaching in university classrooms and fieldwork on active volcanoes throughout the world have provided the authors with unique experiences that they have distilled into a highly readable textbook of lasting value. Questions for Thought, Study, and Discussion, Suggestions for Further Reading, and a comprehensive list of source references make this work a major resource for further study of volcanology. Volcanoes maintains three core foci: Global perspectives explain volcanoes in terms of their tectonic positions on Earth and their roles in earth history Environmental perspectives describe the essential role of volcanism in the moderation of terrestrial climate and atmosphere Humanitarian perspectives discuss the major influences of volcanoes on human societies. This latter is especially important as resource scarcities and environmental issues loom over our world, and as increasing numbers of people are threatened by volcanic hazards Readership Volcanologists, advanced undergraduate, and graduate students in earth science and related degree courses, and volcano enthusiasts worldwide. A companion website is also available for this title at www.wiley.com/go/lockwood/volcanoes
Author : Michael P. Ryan
Publisher : Academic Press
ISBN 13 : 0080959911
Total Pages : 427 pages
Book Rating : 4.0/5 (89 download)
Download or read book Magmatic Systems written by Michael P. Ryan and published by Academic Press. This book was released on 1994-08-26 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 migrationInternal structure of active systemsGrain-scale melt flowRheology of partial meltsNumerical simulation of porous media melt migrationNonlinear (chaotic and fractal) processes in magma transportIn 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
Author : Nick Varley
Publisher : Springer
ISBN 13 : 3642259111
Total Pages : 313 pages
Book Rating : 4.6/5 (422 download)
Download or read book Volcán de Colima written by Nick Varley and published by Springer. This book was released on 2019-02-14 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book represents a comprehensive coverage of the current state of knowledge of Volcán de Colima: its history, its eruptive mechanism, the generation and interpretation of monitoring data, and the risk presented to the local population. The volume pulls together the results of the most important studies of recent years from many areas of volcanology: the geology of its eruptive products; geophysical and geochemical studies of the signals measured that relate to the generation and movement of magma; experimental analysis of its internal processes and the social complexities relating to the risk imposed by future eruptions. Volcán de Colima is an important volcano: it has frequent large Plinian or sub-Plinian eruptions; its activity frequently switches between various regimes, which provides the opportunity to study these transitions from their cause to their impact; and it is a volcano which poses a significant threat to a large population.
Author : Michael R. Carroll
Publisher : Walter de Gruyter GmbH & Co KG
ISBN 13 : 1501509675
Total Pages : 536 pages
Book Rating : 4.5/5 (15 download)
Download or read book Volatiles in Magmas written by Michael R. Carroll and published by Walter de Gruyter GmbH & Co KG. This book was released on 2018-12-17 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 30 of Reviews in Mineralogy introduces in understanding the behavior of magmatic volatiles and their influence on a wide variety of geological phenomena; in doing this it also becomes apparent that there remain many questions outstanding. The range of topics we have tried to cover is broad, going from atomisticscale aspects of volatile solubility mechanisms and attendant effects on melt physical properties, to the chemistry of volcanic gases and the concentrations of volatiles in magmas, to the global geochemical cycles of volatiles. The reader should quickly see that much progress has been made since Bowen voiced his concerns about Maxwell demons, but like much scientific progress, answers to old questions have prompted even greater numbers of new questions. The Voltiles in Magmas course was organized and transpired at the Napa Valley Sheraton Hotel in California, December 2-4, 1994, just prior to the Fall Meetings of the American Geophysical Union in San Francisco.
Author : National Research Council (U.S.). Geophysics Study Committee
Publisher : National Academies
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (318 download)
Download or read book Explosive Volcanism written by National Research Council (U.S.). Geophysics Study Committee and published by National Academies. This book was released on 1984 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309454158
Total Pages : 135 pages
Book Rating : 4.3/5 (94 download)
Download or read book Volcanic Eruptions and Their Repose, Unrest, Precursors, and Timing written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-07-24 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volcanic eruptions are common, with more than 50 volcanic eruptions in the United States alone in the past 31 years. These eruptions can have devastating economic and social consequences, even at great distances from the volcano. Fortunately many eruptions are preceded by unrest that can be detected using ground, airborne, and spaceborne instruments. Data from these instruments, combined with basic understanding of how volcanoes work, form the basis for forecasting eruptionsâ€"where, when, how big, how long, and the consequences. Accurate forecasts of the likelihood and magnitude of an eruption in a specified timeframe are rooted in a scientific understanding of the processes that govern the storage, ascent, and eruption of magma. Yet our understanding of volcanic systems is incomplete and biased by the limited number of volcanoes and eruption styles observed with advanced instrumentation. Volcanic Eruptions and Their Repose, Unrest, Precursors, and Timing identifies key science questions, research and observation priorities, and approaches for building a volcano science community capable of tackling them. This report presents goals for making major advances in volcano science.
