Stable Isotope Investigation Of A Hydrothermal Alteration System
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Stable Isotope Investigation Of A Hydrothermal Alteration System
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Author : Lihua Zhang
language : en
Publisher:
Release Date : 2000
Stable Isotope Investigation Of A Hydrothermal Alteration System written by Lihua Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Copper ores categories.
Typical porphyry-type Cu-Mo mineralization predates and underlies the well-known Main Stage polymetallic veins of the Butte district, Montana. This thesis presents the first systematic study of the isotopic characteristics of the pre-Main Stage K-silicate and sericitic wallrock alteration related to the porphyry Cu-Mo stage. Oxygen and hydrogen isotopic compositions were obtained from hydrous and other silicate minerals of sixty-two samples from the unaltered host rock and ores: four Butte Quartz Monzonite; seven samples from K-silicate alteration; twenty samples of K-silicate alteration affected by late argillic alteration; and twenty-seven samples of gray-sericite alteration. These data support current porphyry Cu-Mo models that the associated hydrothermal fluids that produced pre-Main Stage K-silicate and gray sericite were dominantly magmatic in origin. Butte differs from other porphyry Cu-Mo districts because the widespread Main Stage or younger argillic alteration dominated by meteoric water ([delta]D = -100 to -120%) has partly to totally reset the hydrogen isotopic compositions of hornblende (D = -45 to -l26%) and biotite ([delta]D -61 to -l35%) in the fresh Butte Quartz Monzonite host rock, biotite (D = -47 to -131%o) of the early high temperature K-silicate alteration assemblages, and locally reset the [delta]D values ( -25 to -1 l7%o) of sericite (muscovite) of gray-sericite alteration assemblages. The effect of argillic alteration on these minerals was to produce D-depleted isotopic composition ([delta]D = -80 to -140%). Sulfur isotope analyses have been applied to sulfides and anhydrite from forty-seven samples selected from deep drill cores. These include sulfate-sulfide assemblages in veinlets associated with K-silicate alteration selvages and slightly younger quartz-pyrite veinlets associated with gray-sericite alteration selvages. The K-silicate and gray-sericite sulfide values (34S = +0.4 to +4.7 %) presented here are similar to those of Main Stage sulfides reported previously and suggest a conventional "magmatic" value ([delta]345 about 2 %o) for Butte sulfide-sulfur in the hydrothermal fluid. However, the anhydrite from the K-silicate alteration yields a much heavier 634S value (+ 12.9 %o), therefore, total sulfur (& 4Szs %) of the early K-silicate assemblage was likely as heavy as 10 per mil, suggesting a possible crustal component to this relatively oxidized system.
Stable Isotope Studies Of Some Active Hydrothermal Systems
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Author : Steven J. Lambert
language : en
Publisher:
Release Date : 1976
Stable Isotope Studies Of Some Active Hydrothermal Systems written by Steven J. Lambert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Geochemistry categories.
Stable Isotope Investigation Of Fluids And Water Rock Interaction In The Roosevelt Hot Springs Thermal Area Utah
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Author :
language : en
Publisher:
Release Date : 2005
Stable Isotope Investigation Of Fluids And Water Rock Interaction In The Roosevelt Hot Springs Thermal Area Utah written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Carbon-hydrogen-oxygen isotope compositions have been measured in regional cold waters, geothermal fluids, and hydrothermally altered rocks from the Roosevelt Hot Springs geothermal area. These data have been used, in conjunction with other geological and geochemical data from this geothermal system, to place some limits on the origin of geothermal fluids and reservoir carbon, the fluid recharge area, physical-chemical environment of hydrothermal alteration, and relative permeability of the geothermal system. The similarity of hydrogen isotope compositions of local meteoric water and geothermal reservoir fluid indicate that the geothermal fluids are virtually entirely of surface derivation. An isotopically reasonable source area would be the Mineral Mountains directly to the east of the Roosevelt system. Hydrothermal calcite appears to be in isotopic equilibrium with the deep reservoir fluid. The deltaC/sup 13/ values of deep calcites and T- pH-f0/sub 2/ conditions of the reservoir defined by measured temperature, fluid chemistry, and alteration mineralogy fix the delta/sup 13/C value of the geothermal system to -5 to -6.5% (PDB). These values do not unambiguously define any one source or process, however. There is a relatively small increase in /sup 18/O of geothermal fluids relative to their cold surface water precursors and significant /sup 18/O depletion accompanying hydrothermal alteration of the granitic host rock. These isotopic shifts indicate a high ratio of geothermal fluid to altered rock for the geothermal system, implying relatively rapid (geologically) recirculation rates and significant permeability of the geothermal system.
Stable Isotope C O H Major And Trace Element Studies On Hydrothermal Alteration And Related Ore Mineralization In The Volcano Sedimentary Belt Of Bergslagen Sweden
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Author : Pier Anne de Groot
language : en
Publisher: Faculteit Aardwetenschappen Der Rijksuniversiteit Te Utrecht
Release Date : 1993
Stable Isotope C O H Major And Trace Element Studies On Hydrothermal Alteration And Related Ore Mineralization In The Volcano Sedimentary Belt Of Bergslagen Sweden written by Pier Anne de Groot and has been published by Faculteit Aardwetenschappen Der Rijksuniversiteit Te Utrecht this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Nature categories.
Stable Isotopes In High Temperature Geological Processes
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Author : John W. Valley
language : en
Publisher: Walter de Gruyter GmbH & Co KG
Release Date : 2018-12-17
Stable Isotopes In High Temperature Geological Processes written by John W. Valley and has been published by Walter de Gruyter GmbH & Co KG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-12-17 with Science categories.
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.
Preliminary Mineralogic And Stable Isotope Studies Of Altered Summit And Flank Rocks And Osceola Mudflow Deposits On Mount Rainier Washington
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Author :
language : en
Publisher: DIANE Publishing
Release Date :
Preliminary Mineralogic And Stable Isotope Studies Of Altered Summit And Flank Rocks And Osceola Mudflow Deposits On Mount Rainier Washington written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.
Isotopic Studies Of Hydrothermal Alteration And Large Volume Cold Springs In Fractured Volcanic Rocks Mount Lassen Region California
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Author : Timothy Patrick Rose
language : en
Publisher:
Release Date : 1994
Isotopic Studies Of Hydrothermal Alteration And Large Volume Cold Springs In Fractured Volcanic Rocks Mount Lassen Region California written by Timothy Patrick Rose and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Geology Geochemistry And Stable Isotope Studies Of A Porphyry Molybdenum System Ophir District San Juan Mountains Colorado
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Author : S. E. Jackson
language : en
Publisher:
Release Date : 1983
Geology Geochemistry And Stable Isotope Studies Of A Porphyry Molybdenum System Ophir District San Juan Mountains Colorado written by S. E. Jackson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with categories.
Petrographic Fluid Inclusion And Light Stable Isotope Study Of The Gray Eagle Cu Au Massive Sulfide Deposit Siskiyou County California
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Author : Richard Stanley Cramer
language : en
Publisher:
Release Date : 1982
Petrographic Fluid Inclusion And Light Stable Isotope Study Of The Gray Eagle Cu Au Massive Sulfide Deposit Siskiyou County California written by Richard Stanley Cramer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Principles Of Stable Isotope Distribution
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Author : Robert E. Criss
language : en
Publisher: Oxford University Press
Release Date : 1999-06-03
Principles Of Stable Isotope Distribution written by Robert E. Criss and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-06-03 with Science categories.
This book presents a quantitative treatment of the theory and natural variations of light stable isotopes. It discusses isotope distribution in the context of fractionation processes, thermodynamics, mass conservation, exchange kinetics, and diffusion theory, and includes more than 100 original equations. The theoretical principles are illustrated with natural examples that emphasize oxygen and hydrogen isotope variations in natural waters, terrestrial and extraterrestrial rocks, and hydrothermal systems. New data on meteoric precipitation, rivers, springs, formation fluids, and hydrothermal systems are included in relation to various natural phenomena. Essentially, this book seeks to reconnect the diverse phenomenological observations of isotope distribution to the quantitative theories of physical chemistry and the language of differential equations. It may serve as a textbook for advanced students, as a research reference, or as a quick source of information. The book is organized into five chapters, each followed by suggested quantitative problems and a short reference list. The three theoretical chapters progress from an elementary review of the physical chemistry of stable isotopes, to the thermodynamics of isotopic compounds, and finally to the calculation of isotope distribution in dynamic systems. The third and fifth chapters emphasize oxygen and hydrogen isotope variations in Earth's hydrosphere and lithosphere, constituting the most important examples of the theoretical principles. Appendices provide data on atomic weights of light elements, physical constants, mathematical relationships, and isotopic fractionation factors.