Structural Analysis of Silicic Lava Flow Margins at Obsidian Dome, California
Author: Abigail Martens
Publisher:
Published: 2017
Total Pages:
ISBN-13:
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Author: Abigail Martens
Publisher:
Published: 2017
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DOWNLOAD EBOOKAuthor: Jonathan H. Fink
Publisher: Geological Society of America
Published: 1987-01-01
Total Pages: 155
ISBN-13: 0813722128
DOWNLOAD EBOOKAuthor: Cole G. Kingsbury
Publisher:
Published: 2012
Total Pages:
ISBN-13:
DOWNLOAD EBOOKObsidian Dome is a 550-650 year old, 1.5 by 1.8 km extrusion of high silica rhyolite situated along the Inyo Craters in eastern California. Field, and observations of drill core, reveals discrete metre-scale thick zones of rhyolitic glass exposed along the margin of Obsidian Dome as well as within its interior. Millimetre-scale flow-banded obsidian, pumice and rhyolite range from planar to chaotically folded, the latter a product of ductile, compressive deformation. Fractures, some of which display en-echelon splitting patterns are a result of brittle failure. Taken together, these features along with others, result from flow during lava dome growth and suggest complex emplacement patterns signified by vesiculation, crystallization and repeated brittle-ductile deformation, owing to episodic crossing of the glass transition. Evidence further shows that gas loss from the system occurred due to explosions, pumice formation and also brecciation of the melt as it episodically crossed the glass transition. Loss of gas by these mechanisms along with the inherent high viscosity of rhyolite melt explains the large amount of glass found on and within Obsidian Dome and other similar rhyolite extrusions in comparison to less silica-rich systems.
Author: Michael Manga
Publisher: Geological Society of America
Published: 2005-01-01
Total Pages: 228
ISBN-13: 0813723965
DOWNLOAD EBOOKManga (earth and planetary science, University of California-Berkeley) and Ventura (Instituto Nazionale di Geofisica e Vulcanologia, Italy) overview of the current understanding of the physical, thermal, and chemical processes governing the flow of lava and report on the latest methods for interpreting prehistoric flows. The collected papers encompass volcanological, petrological, and structural studies using numerical and experimental modeling, field studies, remote sensing, and geographic information systems. There is no subject index. Annotation ©2006 Book News, Inc., Portland, OR (booknews.com).
Author: Jonathan H. Fink
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 275
ISBN-13: 364274379X
DOWNLOAD EBOOKThis collection of papers is based on a symposium held in 1987 at the Interna tional Union of Geology and Geodesy Congress in Vancouver, British Colum bia. The Symposium was planned as a follow-up to a session at the 1984 Geo logical Society of America Annual Meeting in Reno, Nevada, which dealt with the emplacement of silicic lava domes. In both cases, emphasis was placed on the physical and mechanical rather than chemical aspects of lava flow. The IUGG Symposium consisted of two lecture sessions, a poster session, and two discussion periods, and had 22 participants. The contributions to this volume are all based on papers presented in the various parts of the Sym posium. The motivation for studying lava flow mechanics is both practical and scientific. Scientists and government agencies seek to more effectively predict the hazards associated with active lavas. Recovering mineral resources found in lava flows and domes also requires an understanding of their emplacement. From a more theoretical standpoint, petrologists view lava studies as a way to directly observe the rheologic consequences of mixing crystals, bubbles, and solid blocks of country rock with silicate liquids. This information can then be used to constrain processes occurring in the concealed conduits, dikes, and chambers that feed flows and domes on the surface.
Author: Angelo Paone
Publisher: BoD – Books on Demand
Published: 2022-06-08
Total Pages: 204
ISBN-13: 1839695021
DOWNLOAD EBOOKProgress in Volcanology includes nine chapters in three sections. The first section is the “Introduction” while the other two sections speak on “Applied Volcanology” and “Volcanic Sedimentology, Geochemistry and Petrology.” The chapters address volcanology in several areas around the world, including Italy, Indonesia, Ethiopia, Argentina, India, and others.
Author:
Publisher:
Published: 1985
Total Pages:
ISBN-13:
DOWNLOAD EBOOKProgress to date indicates: (1) the conduit and lava flow at Obsidian Dome consist of two magma types; (2) the more mafic magma occurs at the base of Obsidian Dome and at the margins of the conduit and was emplaced first; (3) the more silicic magma occurs in the center of the conduit and in the dike; (4) the ilmenite-magnetite and orthopyroxene-augite geothermometers have not reequilibrated in the conduit or dike; (5) the more mafic magma's emplacement temperature was 974°C compared to the silicic magma's 951°C; and (6) trace elements are characteristic of each magma type. (ACR).
Author: Jonathan H. Fink
Publisher: Springer
Published: 2011-12-15
Total Pages: 0
ISBN-13: 9783642743818
DOWNLOAD EBOOKThis collection of papers is based on a symposium held in 1987 at the Interna tional Union of Geology and Geodesy Congress in Vancouver, British Colum bia. The Symposium was planned as a follow-up to a session at the 1984 Geo logical Society of America Annual Meeting in Reno, Nevada, which dealt with the emplacement of silicic lava domes. In both cases, emphasis was placed on the physical and mechanical rather than chemical aspects of lava flow. The IUGG Symposium consisted of two lecture sessions, a poster session, and two discussion periods, and had 22 participants. The contributions to this volume are all based on papers presented in the various parts of the Sym posium. The motivation for studying lava flow mechanics is both practical and scientific. Scientists and government agencies seek to more effectively predict the hazards associated with active lavas. Recovering mineral resources found in lava flows and domes also requires an understanding of their emplacement. From a more theoretical standpoint, petrologists view lava studies as a way to directly observe the rheologic consequences of mixing crystals, bubbles, and solid blocks of country rock with silicate liquids. This information can then be used to constrain processes occurring in the concealed conduits, dikes, and chambers that feed flows and domes on the surface.
Author: Lisa A. Morgan
Publisher: Government Printing Office
Published: 2017
Total Pages: 116
ISBN-13: 9781411342040
DOWNLOAD EBOOKAuthor: John P. Lockwood
Publisher: John Wiley & Sons
Published: 2013-04-26
Total Pages: 677
ISBN-13: 1118687949
DOWNLOAD EBOOKVolcanoes 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