Chemical Isotopic And Petrographic Evidence For Magma Mixing In The San Francisco Volcanic Field Arizona Isotopic Evidence
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Chemical Isotopic And Petrographic Evidence For Magma Mixing In The San Francisco Volcanic Field Arizona Isotopic Evidence
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Author : Anne Lucette Bloomfield
language : en
Publisher:
Release Date : 1990
Chemical Isotopic And Petrographic Evidence For Magma Mixing In The San Francisco Volcanic Field Arizona Isotopic Evidence written by Anne Lucette Bloomfield and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
$\sp{87}$Sr/$\sp{86}$Sr = 0.70424. The Nd and Sr isotopic compositions of the andesites support their derivation as mixtures of basalts and rhyolites.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1991
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Dissertations, Academic categories.
Rates And Mechanisms Of Magmatic Processes
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Author : Brook Thomas Peterson
language : en
Publisher:
Release Date : 2013
Rates And Mechanisms Of Magmatic Processes written by Brook Thomas Peterson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Magmatism has played an integral part in the evolution of the Earth through geologic time. Mantle-derived mafic magmatism is a primary mechanism by which the bulk silicate Earth segregated into mantle and crust, and the continental crust has further differentiated through metamorphism, anatexis, and assimilation. The study of magmatic processes has given rise to our understanding of how the Earth has evolved. Central to this understanding are chemical, isotopic, and geochronological studies. Chemical and isotopic studies provide unparalleled richness of information; this is especially true now, as technological advances extend our analytical and computational capabilities. The difficulties presented in geochemical field studies of magmatic processes are primarily twofold: we are mostly limited to surface samples at the end of their evolutionary story (while the processes of interest are those occurring from source to surface), and it can be difficult to disentangle the myriad causes that produce the chemical and isotopic effects observed. These difficulties can be addressed by combined geochemical-geophysical-geospatial studies, by computational modeling based on an extensive (and growing) body of thermodynamic data, and by application of novel geochemical techniques. As with chemical data, geochronological data are fundamental descriptors in their own right, but they are also crucial because they anchor rates. Almost all geologic processes or features are rate-dependent, from growth of crystals on an atomic scale, to morphologies of volcanoes, to the evolution of the crust. An understanding of chronologies and rates is therefore fundamental to understanding the processes of magmatic evolution. The diverse chapters in this thesis reflect my diverse interests in the Earth sciences, but all are motivated by desire to understand both fundamental aspects of the chemical evolution of magmas, and how that evolution informs our broader understanding of volcanoes, volcanic fields, and continental crust evolution. The first chapter is a geochemical study of the San Francisco Volcanic Field in central Arizona. In this study, I combine geochemical, geochronological, geospatial, and isotopic data with the computational thermodynamic modeling package alphaMELTS to understand the chemical evolution of the volcanic magmas from source to surface. I show that the isotopic and chemical characteristics of the SFVF can be largely explained by assimilation of the deep crust by parent magma derived from fertilized asthenospheric mantle. The computational treatment with alphaMELTS allows for quantitative limits to be placed on the mineralogy, chemistry, and dynamics of the source of the volcanic field. The second chapter is a geochronological study of magmas from the Hawaii Scientific Drilling Project phase 2 core. This study works to extend the U--Th/He dating technique to olivine phenocrysts in relatively undegassed submarine basalts, rocks which are normally difficult to date by other chronometers. The third chapter investigates the evolution of felsic magma chemistries and the changing nature of continental crust source rocks during the Himalayan collision. In this study, I apply relatively new (Mg, Ca) and established (Sr, Nd) isotopic techniques to a sample suite of diverse crustal lithologies (primarily granitoids and felsic volcanics) from the Lhasa, Tibet region. I show that Ca and Mg isotopes are sensitive to specific mineralogies and processes, including carbonate-bearing shale assimilation, and that the Ca and Mg isotopic systems are promising tools in studies of granite petrogenesis, metamorphism, assimilation, and subduction recycling.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1990
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Dissertation abstracts categories.
Publications Of The Geological Survey
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Author : Geological Survey (U.S.)
language : en
Publisher:
Release Date : 1986
Publications Of The Geological Survey written by Geological Survey (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Geology categories.
Bibliography And Index Of Geology
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Author :
language : en
Publisher:
Release Date : 1991
Bibliography And Index Of Geology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Geology categories.
Peninsular Ranges Batholith Baja And Southern California
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Author : Douglas M. Morton
language : en
Publisher: Geological Society of America
Release Date : 2014
Peninsular Ranges Batholith Baja And Southern California written by Douglas M. Morton and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Science categories.
"This book includes petrology, geochronology, and regional aspects of individual plutons, as well as evolution of the Peninsular Ranges batholith. Several chapters deal with geophysical, chemical, and isotopic based interpretations of the genesis and evolution of the batholith. An accompanying DVD contains detailed colored maps and chemical, isotopic, mineralogic, and physical properties data"--Provided by publisher.
Chemical Abstracts
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Author :
language : en
Publisher:
Release Date : 1991
Chemical Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Chemical abstracts categories.
A Geochemical And Lead Oxygen Isotope Study Of A Trachyte To Rhyolite Dominated Eruptive Center Davis Mountain Volcanic Field Trans Pecos Volcanic Province
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Author : Robert Lee Ward
language : en
Publisher:
Release Date : 1995
A Geochemical And Lead Oxygen Isotope Study Of A Trachyte To Rhyolite Dominated Eruptive Center Davis Mountain Volcanic Field Trans Pecos Volcanic Province written by Robert Lee Ward and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Geology categories.
New Publications Of The U S Geological Survey
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Author : Geological Survey (U.S.)
language : en
Publisher:
Release Date : 1990
New Publications Of The U S Geological Survey written by Geological Survey (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Geology categories.