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Showing 1 to 17 of 17 for “"metamorphic petrology"”.
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Integrating in situ Geochronology and Metamorphic Petrology: An Example from the Gruf Complex, European Central Alps
… mineral U-Pb geochronology to date (U)HT metamorphic events. However, it is not always clear to what part of the pressure-temperature (P-T) path the ages relate. Using an in situ approach, this study combines accessory mineral U-Pb geochronology with single mineral thermometry, …
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Metamorphic petrology, pressure-temperature paths, and tectonic evolution of the Mount Cube Quadrangle, New Hampshire and Vermont
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1985.
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A reconnaissance study of the metamorphic petrology and volcanic geochemistry of a portion of the Island Lake greenstone belt, Manitoba /
… Most of the belt is within the greenschist metamorphic f acies with amphibolite facies occurring in certain areas near t he margins. A post-tectonic, low pressure thermal event may be responsible for the development of a unit of cordierite schi s t which stretches southeastwards from the …
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Metamorphism of the Troodos Massif, Cyprus
… of the sequence is basaltic and is divided by a metamorphic discontinuity near the top which sometimes coincides with an unconformity. This boundary separates two groups of lavas and their related dykes. Each unit has a characteristic metamorphic petrology. Metabasalts from the lower division, …
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The role of the Picuris orogeny in the tectonic evolution of Proterozoic North America
… geochronology, structural analysis, and metamorphic petrology.</p> <p>Here we 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 …
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The thermal and metamorphic evolution of mountain belts as a response to erosion, accretion, and radiogenic heating
… of collisional orogenesis generally predict metamorphic temperatures that are much cooler than those revealed by thermo barometric studies of real metamorphic terrains. This thesis focuses on a more realistic model that accounts for the redistribution of crust enriched in heat-producing …
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The thermal and metamorphic evolution of the Northern Highlands Terrane, Scotland
… and geochronology, in conjunction with metamorphic petrology and additional accessory phase geochronology, to place constraints on the timing and rates of thermal metamorphism in a variety of structural settings throughout the NHT. Our data show that the ductile thrust nappes of …
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Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia
The Blue Ridge Province in southern and central Virginia is a complex slice of Precambrian basement emplaced on the margin of Laurentia during collisional events in the Paleozoic. This allochthonous basement is composed of Middle Proterozoic continental crust, Late Proterozoic intrusives, and Late …
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Metamorphism in the Northern Front Range, Colorado
Thermobarometry, detailed petrography, electron microprobe analysis, and fluid inclusion microthermometry were used to quantify the history of a high grade Proterozoic terrane exposed within the northeastern Colorado Front Range. Pressure-temperature calculations identified two blocks from …
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Textural and Chemical Relations Among Spinel-Sapphirine-Garnet-Orthopyroxene, Salt Hill Emery Mine, Cortlandt Complex, N.Y.
Very high temperature (>900 °C) contact metamorphism and metasomatism of aluminous schist xenoliths in the mafic to ultramafic Cortlandt Complex, New York, resulted in formation of bodies of unusual Fe- and Al-oxide-rich rock called emery. During contact heating, disequilibrium thermal …
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From the Appalachians to the Alps: Constraints on the Timing, Duration, and Conditions of Metamorphism at Convergent Margins
… with the retrieval of this information from the metamorphic rock record are insufficient temporal resolution and processes that overprint or obscure the full record of metamorphism. Understanding what processes are recorded, and why they are recorded, is critical for accurate models of tectonics. …
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Petrologic and Fluid Inclusion Constraints on the Tectonic Evolution of the Manhattan Prong, Southeastern New York
… southeastern New York, has experienced multiple metamorphic events. Two episodes of intrusion, separated by approximately 100 million years, have superimposed contact aureoles on the Taconic regional metamorphic gradient in the northeastern Manhattan Prong and have modified the regional …
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Applications of Elastic Modeling, Thermobarometry, and Thermal History Modeling to (Ultra)high-Pressure Metamorphic Rocks
… reactions during the subduction-exhumation metamorphic cycle. (Ultra)high-pressure ((U)HP) metamorphic rocks, such as blueschists and eclogites, are formed during metamorphism of subducted crust and sediments along relatively cold geothermal gradients. (U)HP metamorphic rocks may be …
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Banda Forearc Metamorphic Rocks Accreted to the Australian Continental Margin: Detailed Analysis of the Lolotoi Complex of East Timor
… indicate that it is part of a group of thin metamorphic klippen found throughout the region that were detached from the Banda forearc and accreted to the NW Australian continental margin during Late Miocene to Present arc-continent collision. Metamorphic rock types are dominated by (in order …