Journal ArticleDOI
Microsampling and Isotopic Analysis of Igneous Rocks: Implications for the Study of Magmatic Systems
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TLDR
Isotopic fingerprinting has been used to trace magmatic processes and the components that contribute to magmas as mentioned in this paper, and the relationship between isotopic composition and petrographic features, such as dissolution surfaces, can be used to constrain magma evolution pathways involving open system processes.Abstract:
Isotopic fingerprinting has long been used to trace magmatic processes and the components that contribute to magmas. Recent technological improvements have provided an opportunity to analyze isotopic compositions on the scale of individual crystals, and consequently to integrate isotopic and geochemical tracing with textural and petrographic observations. It has now become clear that mineral phases are commonly not in isotopic equilibrium with their host glass/groundmass. Isotopic ratios recorded from core to rim of a mineral grain reflect the progressive changes in the magma composition from which the mineral crystallized. The sense of these changes and the relationship between isotopic composition and petrographic features, such as dissolution surfaces, can be used to constrain magma evolution pathways involving open system processes such as magma mixing, contamination and recharge.read more
Citations
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Amphibole “sponge” in arc crust?
TL;DR: In this article, amphibole is used as a filter for water dissolved in mantle-derived arc magmas, and amphibole cumulates may act as a fertile source of intracrustal melts and fluids.
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Vertically extensive and unstable magmatic systems: A unified view of igneous processes
TL;DR: The evidence that shallow magma chambers are actually assembled quickly from much larger, crystal-rich transcrustal magmatic systems is reviewed, infering that igneous processes differ substantially in the lower and upper crust.
Journal ArticleDOI
Tectonics and Climate of the Southern Central Andes
Manfred R. Strecker,Ricardo N. Alonso,Bodo Bookhagen,Barbara Carrapa,George E. Hilley,Edward R. Sobel,Martin H. Trauth +6 more
TL;DR: The history of the southern central Andes, including the world's second largest plateau and adjacent intermontane basins and ranges of the Eastern Cordillera and the northern Sierras Pampeanas of Argentina and Bolivia, impressively documents the effects of tectonics and topography on atmospheric circulation patterns, the development of orographic barriers, and their influence on erosion and landscape evolution at various timescales as discussed by the authors.
Journal ArticleDOI
Rhyolites and their Source Mushes across Tectonic Settings
TL;DR: In this paper, the authors argue that combined field, thermal, geochemical, and geophysical observations favor residual melt extraction from crystalline mushes as the likely scenario in all tectonic settings.
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Petrologic Reconstruction of Magmatic System Variables and Processes
Jon D Blundy,Kathy Cashman +1 more
TL;DR: In this article, the authors present some of the current petrological techniques that can be used for studying eruptive products and for constraining key magmatic variables such as pressure, temperature, and volatile content.
References
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Book
Principles of isotope geology
TL;DR: The roots of isotope geology can be found in this paper, where a geology of Neodymium and Strontium in meteorites and Igneous rocks is described.
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The Genesis of Intermediate and Silicic Magmas in Deep Crustal Hot Zones
TL;DR: In this article, a model for the generation of intermediate and silicic igneous rocks is presented, based on experimental data and numerical modeling, which is directed at subduction-related magmatism, but has general applicability to magmas generated in other plate tectonic settings, including continental rift zones.
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Experimental investigations of the role of H2O in calc-alkaline differentiation and subduction zone magmatism
TL;DR: The phase relations of natural aphyric high-alumina basalts and their intrusive equivalents were determined through rock-melting experiments at 2 kb, H2O-saturated with fO2 buffered at NNO.
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Rates of magma emplacement and volcanic output
TL;DR: In this paper, a compilation of about one hundred estimates of volumetric rates of magma emplacement and volcanic output that are average rates for durations of igneous activity greater than 300 yrs.
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Crystal size distribution (CSD) in rocks and the kinetics and dynamics of crystallization
TL;DR: In this article, the authors provide a formalism for the macroscopic study of kinetic and physical processes affecting crystallization, within which the explicit affect of chemical and physical process on the CSD can be analytically tested.