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Ultrahigh pressure metamorphism (UHPM) is a relatively new but fast growing discipline related to the deep subduction of slabs of continental and/or oceanic crust into the Earth's mantle and their return towards the surface as important components of mountain belts. The discipline was established ~25 years ago after discoveries of high pressure minerals, coesite and diamond, in the rocks of the continental affinities, a place where such minerals are "forbiden?according to main geological concepts. Exposures of HP/UHP rocks, once thought to be restricted to European Mountain systems, are bei

High pressure (Science). --- Metamorphism (Geology). --- Metamorphism (Geology) --- High pressure (Science) --- Geology --- Earth & Environmental Sciences --- Petrology --- Pressure

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1000 °C) and low pressures (< 2 kb) and typically results in the formation of "burnt" and fused rocks termed buchites, paralavas, clinkers and fulgarites. It is typically associated with shallow basaltic intrusions (contact aureoles, xenoliths,) combustion of carbonaceous matter, lightning strikes, and is also found in meteorites. During pyrometamorphism, the sequence of heating and cooling is greatly condensed favouring the preservation of a variety of stranded reaction microstructures that reflect disequilibrium reaction kinetics with metastable and mineral crystallisation. This second edition includes the latest developments in the study of pyrometamorphism derived from over 60 new references and accompanied with over 20 new illustrations.

Metamorphism (Geology) --- Metamorphic rocks. --- Rocks, Metamorphic --- Earth sciences. --- Geochemistry. --- Mineral resources. --- Mineralogy. --- Earth Sciences. --- Mineral Resources. --- Rocks --- Petrology

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Metamorphism (Geology) --- Orogenic belts --- Belts, Fold --- Belts, Orogenic --- Fold belts --- Foldbelts --- Orogenes --- Orogens --- Geology, Structural --- Petrology --- Orogenic belts.

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Pyrometamorphism is a type of contact metamorphism (sanidinite facies) involving very high temperatures that may cause fusion in suitable lithologies at very low pressures. The high temperatures are attained by flow of mafic magma through conduits, by way of spontaneous combustion of coal, carbonaceous sediments, oil and gas, and through the action of lightning strikes. Temperature gradients are typically extreme, varying by several hundred degrees over a few metres or even centimetres. Relatively short periods of heating and cooling create an environment dominated by metastable melting and rapid mineral reaction rates driven by significant temperature overstepping of equilibrium conditions. This results in the formation of a large variety of minerals, many of which are metastable and are only found in pyrometamorphic rocks. The book is aimed for the specialist but also for students and researchers looking for an introduction into pyrometamorphism.

Metamorphism (Geology) --- Metamorphic rocks. --- Rocks, Metamorphic --- Rocks --- Petrology --- Mineralogy. --- Mineral resources. --- Geochemistry. --- Mineral Resources. --- Chemical composition of the earth --- Chemical geology --- Geological chemistry --- Geology, Chemical --- Chemistry --- Earth sciences --- Deposits, Mineral --- Mineral deposits --- Mineral resources --- Mines and mining --- Mining --- Natural resources --- Geology, Economic --- Minerals --- Physical geology --- Crystallography

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This Special Issue comprises 12 papers from authors in 10 countries with new insights on the close coupling between magma as an energy and fluid source with hydrothermal systems for the primary control of magmatic behavior. Data and interpretation are provided on the rise of magma through a hydrothermal system, the relative timing of magmatic and hydrothermal events, the temporal evolution of supercritical aqueous fluids associated with ore formation, the magmatic and meteoric contributions of water to the systems, the big picture for the highly active Krafla Caldera, Iceland, as well as the implications of results from drilling at Krafla concerning the magma–hydrothermal boundary. Some of the more provocative concepts are that magma can intrude a hydrothermal system silently, that coplanar and coeval seismic events signal “magma fracking” beneath active volcanoes, that intrusive accumulations may far outlast volcanism, that arid climate favors formation of large magma chambers, and that even relatively dry rhyolite magma can rapidly convect and so lack a crystallizing mush roof. A shared theme is that hydrothermal and magmatic reservoirs need to be treated as a single system.

la soufrière --- guadeloupe --- volcanic gas --- volcanic unrest --- hydrothermal gas --- multigas --- extensometry --- Krafla volcano --- geothermal systems --- conceptual models --- volcanology --- magma --- hydrothermal --- fracking --- volcanoes --- Kamchatka --- igneous petrology --- tectonics --- heat flow --- glaciation --- climate --- incremental pluton emplacement --- contact metamorphism --- petrochronology --- titanite --- zircon --- U-Pb dating --- thermometry --- hydrothermal fluids --- incremental intrusion --- hydrothermal fluid --- microstructure --- dissolution --- precipitation --- textural coarsening --- alteration --- porosity --- eruption --- fracture --- permeability --- dome emplacement --- hydrothermal system --- RSAM --- tremor --- gliding spectral lines --- White Island --- phreatic eruptions --- geyser --- Uzon --- CO2 --- TOUGH2 --- modeling --- Kirishima volcano group --- Ebinokogen Ioyama volcano --- geothermal activity --- multiple hydrothermal system --- magmatic hydrothermal eruption --- kick upwelling --- Erdenet Cu–Mo deposit --- cathodoluminescence --- supercritical fluid --- transient fluid pressure --- magmatic-hydrothermal system --- fluid inclusion --- magma energy --- magma convection --- heat flux --- geothermal energy --- magma–hydrothermal --- heat transport --- gas and fluid geochemistry --- phreatic eruption --- volcano monitoring --- geophysical imaging --- drilling