Andean Magmatism
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Andean Magmatism And Its Tectonic Setting
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Author : Russell S. Harmon
language : en
Publisher: Geological Society of America
Release Date : 1991
Andean Magmatism And Its Tectonic Setting written by Russell S. Harmon 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 1991 with Science categories.
Andean Magmatism
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Author : HARMON/BARREIRO
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Andean Magmatism written by HARMON/BARREIRO and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Destructive plate margin magmagenesis is one of the most intensely studied and widely debated topics in the earth sciences at present. Calc-alkaline volcanic and plutonic rocks in orogenic settings exhibit such a diversity of composition and character that the subducted oceanic lithosphere, the overlying 'enriched' lithospheric mantle and the lower continental crust all have been advocated recently as the primary source region for island-arc and continental-margin basaltic to andesitic magmas. The role of the upper continental crust is also a matter of continuing controversy. It is clear that crustal contamination is a common, but not universal, feature of destructive plate margin magmatism. Whether this contamination is introduced at source by subduction-related processes or occurs during magma transit by bulk anatexis and magma mixing, selective contamination or coupled fractional crystallization-assimilation mechanisms is central to most current discussions of andesite petrogenesis. This book presents a series of papers which directly address these and other important geological and geochemical problems within the context of the Mesozoic-Cenozoic calc-alkaline magmatism characteristic of the Andean Cordillera of western South America. Although it is aimed primarily at postgraduate students and researchers familiar with the Andes, it is also a useful general reference for workers in other fields who wish to gain an insight into current thoughts, ideas and speculations on 'andesitic' magmatism at destructive plate margins.
Andean Magmatism
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Author : Russell S. Harmon
language : en
Publisher:
Release Date : 1984
Andean Magmatism written by Russell S. Harmon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with History categories.
Andean Magmatism
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Author : 3Island Press
language : en
Publisher:
Release Date : 1984-10-02
Andean Magmatism written by 3Island Press and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984-10-02 with categories.
Andean Magmatism In Peru Geochemistry And Petrogenesis
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Author : Louis Michael SANDERSON
language : en
Publisher:
Release Date : 1981
Andean Magmatism In Peru Geochemistry And Petrogenesis written by Louis Michael SANDERSON and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
Evolution Of An Andean Margin
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Author : Suzanne Mahlburg Kay
language : en
Publisher: Geological Society of America
Release Date : 2006-01-01
Evolution Of An Andean Margin written by Suzanne Mahlburg Kay 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 2006-01-01 with Science categories.
"The objective of this volume is to examine the Cenozoic tectonic and magmatic evolution from the arc to the retroarc of a distinctive end-member of the Andean accretionary orogen between 35*S and 39*S. The evolution of the Andes in this region provides an outstanding case study of an orogen where periods of contraction and extension, crustal shortening and normal faulting, and differences in retroarc volcanism reflect a tectonic regime that alternates in space and time. Structural, magmatic, and paleogeographic patterns correlate strongly with the dynamics of the subduction zone. The region includes the Neuquen basin which is one of the most prolific of the Central Andes. The tectonic setting is important in understanding hydrocarbon systems of the sub-Andean basin and the potential for ore deposits in the cordillera. The book is fundamental for researchers working on tectonics and magmatism in Andean type systems as well as those involved in exploration."--Publisher's website.
Magmatism At A Plate Edge
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Author : Wallace S. Pitcher
language : en
Publisher: Longman Scientific and Technical
Release Date : 1985
Magmatism At A Plate Edge written by Wallace S. Pitcher and has been published by Longman Scientific and Technical this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with History categories.
Tertiary Andean Magmatism In Chile And Argentina Between 28os And 33os
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Author : S.M. Kay
language : en
Publisher:
Release Date : 1988
Tertiary Andean Magmatism In Chile And Argentina Between 28os And 33os written by S.M. Kay and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Early Andean Subduction Related Magmatism Northern Chile 26 5 S
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Author : Sergio Hernan Gelcich
language : en
Publisher:
Release Date : 2006
Early Andean Subduction Related Magmatism Northern Chile 26 5 S written by Sergio Hernan Gelcich and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Most of the studied Late Jurassic to Early Cretaceous plutonic units in the area host massive magnetite. The age of massive magnetite mineralization overlaps the age of plutons with which they are spatially associated. U-Pb (titanite) and 40Ar/39Ar (actinolite) ages for two massive tabular magnetite bodies, La Suerte and Bolaco (& sim;154 Ma and 152 Ma, respectively), indicate previously unreported, upper Jurassic massive magnetite mineralization. A precise apatite-magnetite U-Pb isochron age for the Carmen massive magnetite deposit shows that magnetite-apatite dykes crystallized at the same time as quartz diorites that partially host mineralization at & sim;131 Ma. Pb isotopic correspondence, combined with the temporal and spatial association between magnetite-apatite mineralization and dioritic-quartz dioritic magmatism, suggests a genetic relationship between early Andean continental arc magmatism, massive magnetite-apatite deposits and IOCG mineralization. Although the origin of the massive magnetite bodies has not been fully tested, the genetic hypothesis for derivation from Fe-P oxide melts is reasonable. Hydrothermal IOCG mineralization is spatially associated with massive magnetite-apatite mineralization, and postdates it. Early Andean (Jurassic-Early Cretaceous) arcs developed in extension on a continental crust composed of Permo-Triassic granitoids, Paleozoic metasedimentary rocks and unexposed Proterozoic rocks. The La Negra basaltic to dacitic volcanic unit occur in a & sim;1000 km belt in the Coastal Cordillera of northern Chile from & sim;18°S to & sim;28°S and represent the first recorded magmatic activity in the Andean cycle. The base of the La Negra Formation & sim;26°S has been dated at 193.0 +/- 0.6 Ma (single zircon U-Pb). This lower Jurassic age for the onset of Andean magmatism is supported by ages obtained for the Flamenco pluton (191.3 +/- 0.4 Ma). The La Negra Formation is intruded by a series of epizonal plutonic units that range in age from & sim;160 Ma & sim;125 Ma, and show a systematic migration of the magmatic locus to the east at an average rate of & sim;460 m/Myr. Hf isotopic compositions of zircons show that the early Andean magmas were mainly mantle-derived with partial assimilation of enriched (Ho crustal rocks. They reveal a progressive change of the lower crust from less to more radiogenic crust (Hf).
Andean Magmatism
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Author : E. J. Cobbing
language : en
Publisher:
Release Date :
Andean Magmatism written by E. J. Cobbing and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.