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Showing 1 to 9 of 9 for “"high-temperature metamorphism"”.
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On Ultra-High Temperature Metamorphism in the Mid-Lower Crust
… complex is an excellent natural example of ultra-high temperature (UHT) metamorphic processes and country rock-magma interaction due to mappable units of hybrid igneous rocks and the presence of large, partially melted, politic "emery" xenoliths. Previous attempts to understand the formation of …
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High-temperature metamorphism in the western Namaqua-Natal Metamorphic Province (South Africa): implications for low-pressure granulite terranes
The interpretation of pressure (P)-temperature (T)-time (t) data is key to reconstruct the geologic evolution of ancient exhumed orogens. Of these, temperature is regarded as proxy for the heat energy available during orogenic metamorphism. Heat - the ultimate driving force of metamorphism - is …
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High-temperature metamorphism in the western Namaqua-Natal Metamorphic Province (South Africa): implications for low-pressure granulite terranes
The interpretation of pressure (P)-temperature (T)-time (t) data is key to reconstruct the geologic evolution of ancient exhumed orogens. Of these, temperature is regarded as proxy for the heat energy available during orogenic metamorphism. Heat - the ultimate driving force of metamorphism - is …
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The role of the Picuris orogeny in the tectonic evolution of Proterozoic North America
… show that portions of New Mexico did not undergo high temperature metamorphism until the Picuris orogeny, and that much of the regional deformation documented in these locations accompanied metamorphism during a single progressive tectonic event that featured thrusting and heterogeneous crustal …
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A study of epigenetic mineralisation in the Central Zone of the Damara Orogen, Namibia with special reference to gold, tungsten, tin and rare earth elements
… greenschist/amphibolite-facies, low-pressure/high-temperature metamorphism and numerous granitic and pegmatitic intrusions. This thesis integrates regional and detailed geological mapping with petrographic studies, whole rock geochemistry (obtained by X-ray fluorescence spectrometry, atomic …
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Metamorphic and Tectonic Evolution of the Paleoproterozoic Thompson Nickel Belt, Manitoba
… The analysis of microstructures suggests peak metamorphism was coincident with and possibly outlasted this penetrative event. Later generations of deformation resulted in tight, vertical to steeply incline folds commonly paralleled by shear zones with subvertical stretching lineations. Shear …
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ADVANCED MINERALOGICAL AND CRYSTALLOGRAPHICAL TECHNIQUES FOR UNDERSTANDING TRANSFORMATION PROCESSES IN NATURAL MATERIALS AND THEIR SYNTHETIC ANALOGOUS
This study aims to compare the Combustion Pyrometamorphism (CP) process involving limestone and marly-limestone belonging to Hatrurim Basin in Israel and the human-made cement manufacture by means of both standard (Reflected and Transmitted Light Microscopy, X-ray Fluorescence, Laboratory X-ray …
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Metamorphic and crustal evolution of Australian-Antarctic Proterozoic margins
Regional, long-lived (>>50 Myr), high temperature–ultrahigh temperature (HT–UHT) metamorphism challenges conventional notions on the thermal state of the crust as it requires the sustaining of high energy thermal gradients (>>75 °C/kbar). Regional, long-lived, high thermal gradient metamorphism …
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The metamorphic sheet and underlying volcanic rocks beneath the Semail ophiolite in the northern Oman mountains of Arabia
… and the late sills are strongly alkaline with high Ti, p, Zr and Nb contents, low <sup>Y</sup>/Nb ratios and steep LREE enriched rare earth patterns. They are typical "within-plate" alkaline magmas characteristic of continental rift zones and some ocean islands. Two types of tholeiites are …