Magma Mixing and Sulfide Production in the Lower Crust PDF Download
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Author: Kyle Charles Rebryna
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
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Book Description
The location and distribution of metal sources for felsic-magma related ore deposits in continental and island arcs (porphyry Cu-Au-Mo, epithermal Au-Ag, and skarn) is contentious. Crustal and mantle sources may both contribute to the metal budgets of these types of deposits, with a chemical signature that is set early. Mixing between mantle-sourced magmas and crustal partial melts in Mixing, Assimilation, Storage, and Homogenisation (MASH) zones, at or near the base of the Earth's crust, is a possible mechanism to generate fertile magmas for ore development. Magma mixing of this sort may have an important role in sulfur solubility and thus sulfide mineral stability. Sulfide minerals partition Cu, Au, Ag, Mo, platinum group elements, and other chalcophile metals, which are key components in felsic magma-related ore deposits. This study investigates the role of magma mixing in the production of sulfide melts in the lower crust and the role that these sulfide melts have in ore generation in the upper crust. Geochemical data from samples collected in the lower crustal Opirarukaomappu Gabbroic Complex (OGC), southeastern Hokkaido, Japan suggest that sulfide occurrences are associated with magma compositions produced by mixing ~80% gabbro with ~20% tonalite. High temperature, high pressure piston cylinder experiments are used to simulate this mixing and the consequent saturation and exsolution of sulfide melt. A new, redox-controlled, model for sulfide saturation, called the "sulfur fence", describes a sudden reduction in sulfur solubility caused by the mixing of oxidised, sulfate-rich magmas with magmas containing a strongly reducing component (i.e. graphite). In this model, reduction from sulfate-stable to sulfide-stable decreases sulfur solubility by an order of magnitude (from ~1 wt. % to ~0.1 wt. %). Resulting large scale sulfur oversaturation may allow the generation of pervasive and voluminous sulfide melts in mixing magmas. The greater density of sulfide melts causes them to settle through lower density silicate magmas. Small globules (
Author: Kyle Charles Rebryna
Publisher:
ISBN:
Category :
Languages : en
Pages : 178
Get Book Here
Book Description
The location and distribution of metal sources for felsic-magma related ore deposits in continental and island arcs (porphyry Cu-Au-Mo, epithermal Au-Ag, and skarn) is contentious. Crustal and mantle sources may both contribute to the metal budgets of these types of deposits, with a chemical signature that is set early. Mixing between mantle-sourced magmas and crustal partial melts in Mixing, Assimilation, Storage, and Homogenisation (MASH) zones, at or near the base of the Earth's crust, is a possible mechanism to generate fertile magmas for ore development. Magma mixing of this sort may have an important role in sulfur solubility and thus sulfide mineral stability. Sulfide minerals partition Cu, Au, Ag, Mo, platinum group elements, and other chalcophile metals, which are key components in felsic magma-related ore deposits. This study investigates the role of magma mixing in the production of sulfide melts in the lower crust and the role that these sulfide melts have in ore generation in the upper crust. Geochemical data from samples collected in the lower crustal Opirarukaomappu Gabbroic Complex (OGC), southeastern Hokkaido, Japan suggest that sulfide occurrences are associated with magma compositions produced by mixing ~80% gabbro with ~20% tonalite. High temperature, high pressure piston cylinder experiments are used to simulate this mixing and the consequent saturation and exsolution of sulfide melt. A new, redox-controlled, model for sulfide saturation, called the "sulfur fence", describes a sudden reduction in sulfur solubility caused by the mixing of oxidised, sulfate-rich magmas with magmas containing a strongly reducing component (i.e. graphite). In this model, reduction from sulfate-stable to sulfide-stable decreases sulfur solubility by an order of magnitude (from ~1 wt. % to ~0.1 wt. %). Resulting large scale sulfur oversaturation may allow the generation of pervasive and voluminous sulfide melts in mixing magmas. The greater density of sulfide melts causes them to settle through lower density silicate magmas. Small globules (
Author: Steven Earle
Publisher:
ISBN: 9781537068824
Category :
Languages : en
Pages : 628
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Book Description
This is a discount Black and white version. Some images may be unclear, please see BCCampus website for the digital version.This book was born out of a 2014 meeting of earth science educators representing most of the universities and colleges in British Columbia, and nurtured by a widely shared frustration that many students are not thriving in courses because textbooks have become too expensive for them to buy. But the real inspiration comes from a fascination for the spectacular geology of western Canada and the many decades that the author spent exploring this region along with colleagues, students, family, and friends. My goal has been to provide an accessible and comprehensive guide to the important topics of geology, richly illustrated with examples from western Canada. Although this text is intended to complement a typical first-year course in physical geology, its contents could be applied to numerous other related courses.
Author:
Publisher:
ISBN: 9781934969359
Category : Copper
Languages : en
Pages : 370
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Book Description
Author: Michael P. Ryan
Publisher: Academic Press
ISBN: 0080959911
Category : Science
Languages : en
Pages : 427
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Book Description
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: Leland Wilbur Younker
Publisher:
ISBN:
Category : Batholiths
Languages : en
Pages : 176
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Book Description
Author: John W. Valley
Publisher: Walter de Gruyter GmbH & Co KG
ISBN: 1501508938
Category : Science
Languages : en
Pages : 588
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Book Description
Volume 16 of Reviews in Mineralogy inroduces to high-temperature stable isotope geochemistry and should provide an entry into the pertinent literature, as well as some understanding of the basic concepts and potential applications. The first three chapters focus on the theory and experimental data base for equilibrium, disequilibrium, and kinetics of stable isotope exchange reactions among geologically important minerals and fluids. The fourth chapter discusses the primordial oxygen isotope variations in the solar system prior to formation of the Earth, along with a discussion of isotopic anomalies in meteorites. The fifth chapter discusses isotopic variations in the Earth's mantle and the sixth chapter reviews the variations in the isotopic compositions of natural waters on our planet. In Chapters 7, 8, 9 and 10, these isotopic constraints and concepts are applied to various facets of the origin and evolution of igneous rocks, bringing in much material on radiogenic isotopes as well, because these problems require a multi-dimensional attack for their solution. In Chapters 11 and 12, the problems of hydrothermal alteration by meteoric waters and ocean water are considered, together with discussions of the physics and chemistry of hydrothermal systems and the 18O/16O history of ocean water. Finally, in Chapters 13 and 14, these concepts are applied to problems of metamorphic petrology and ore deposits, particularly with respect to the origins of the fluids involved in those processes.
Author: David A. John
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 276
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Book Description
Author: William P. Nash
Publisher:
ISBN:
Category : Geology, Stratigraphic
Languages : en
Pages : 98
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Book Description
Author: Yildirim Dilek
Publisher: Geological Society of America
ISBN: 9780813723495
Category : Science
Languages : en
Pages : 570
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Book Description
The proceedings from the September 1998 conference in Marshall, California contain 39 papers on the following topics: ophiolites, ocean crust, and global tectonics; oceanic lower crust and upper mantle; structure and physical properties of upper oceanic crust; hydrothermal processes; Pacific Rim ophiolites; and, Ophiolites from Iapetus, Rheic-Pleionic, Neotethyan, and Indian Oceans. Contributors include scientists with backgrounds in structural geology, tectonics, geophysics, petrology, and geochemistry. Numerous black and white illustrations (and one in color) are included. Annotation copyrighted by Book News Inc., Portland, OR
Author: Diego Perugini
Publisher: Springer
ISBN: 9783030818135
Category : Science
Languages : en
Pages : 0
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Book Description
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.
