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Showing 1 to 20 of 64 for “"metamorphic rocks"”.
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A geochronologic study of metamorphic rocks in northeastern Massachusetts
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Microstructural Controls on the Crystallization and Exhumation of Metamorphic Rocks
… versus kinetic factors control the evolution of metamorphic rocks. Four studies in this dissertation address this, finding that: i) garnet crystals crystallize via epitaxial nucleation in which garnet crystallizes by templating on the crystal structure of muscovite; ii) the distribution of grain …
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Lithium, Beryllium and Boron in High-Pressure Metamorphic Rocks from Syros (Greece)
In this study, high-pressure metamorphic rocks from the island of Syros (Greece) that are interpreted as parts of subducted oceanic crust, equilibrated at about 1.5-2.0 GPa and 500 °C were analysed. A first group of samples (Group 1) includes rocks that preserved the parageneses formed at the …
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The spatial degree of chemical equilibrium in some high grade metamorphic rocks
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1967.
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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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Phase equilibrium in the metamorphic rocks of St. Paul Island and Cape North, Nova Scotia
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1959.
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THE INTERPLAY BETWEEN CATION ORDERING AND ELASTICITY OF OMPHACITES TO UNRAVEL PTT PATHS OF METAMORPHIC ROCKS
… in blueschist facies and ultra-high-pressure rocks. Its widespread occurrence makes it a valuable candidate for Raman elastic geothermobarometry, a method that uses the deformation recorded by mineral inclusions to determine the pressure and temperature conditions under which they were …
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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 …
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A detailed petrographic and oxygen isotope study of metamorphic rocks and archean basement complex Gneisses from the Vredefort dome, South Africa
… greenschist and amphibolite grades within rocks of the Witwatersrand Supergroupand Dominion Group in the collar of the Vredefort dome, to granulite grades in the core ofthe dome. In the collar, two metamorphic assemblages have been identified, one representing a peak metamorphic event …
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A stable isotope investigation into fluid-rock interaction during regional metamorphism in western dronning maud land, East Antarctica
… is widespread. In this study, the high-grade metamorphic rocks which make up the Sverdrupfjella Group were sampled in the central Kirwanveggen area. The stable isotope and whole-rock composition of these rocks have been determined, in order to test whether zones of intense fluid-rock …
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The Day Nui Con Voi mylonitic belt in Southwestern China and Its implications for the early Cenozoic extrusion of Indochina
… extruded fragment, the belt of mylonitic metamorphic rocks generally referred to as the Ailao Shan/Red River shear zone forms the extrusion boundary. This shear zone actually consists of at least two belts, the Ailao Shan and the Day Nui Con Voi, which are separated by a narrow belt of …
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Metamorfismo ercinico di bassa-pressione: evoluzione tettonico-metamorfica del complesso di mandatoriccio (massiccio della Sila - Calabria)
Low-pressure/high-temperature (LP/HT) metamorphic belts are characterised by rocks that experienced abnormal heat flow in shallow crustal levels (T > 600 °C; P < 4 kbar) resulting in anomalous geothermal gradients (60-150 °C/km). The abnormal amount of heat has been related to crustal underplating …
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The tectonic relationships of the Hillabee Chlorite Schist and the adjacent rock units in southern Cleburne County, Alabama
… The Talladega block is composed of low grade metamorphic rocks. Sericite Phyllites and Quartzites are the main composition units. Metamorphic and tectonic events have created four defined structural events that are mapped in the block. The Hillabee Chlorite Schist, a low grade metamorphic unit …
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Subsurface Precambrian of Saskatchewan
… and regional geophysical maps, the Precambrian rocks of Saskatchewan which occur beneath the Palaeozoic and later rocks consist of predominantly northtrending belts ot granitic and metamorphic rocks. The rock assemblage found in the covered Precambrian Shield appears to be similar to that mapped …
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ΓΕΩΛΟΓΙΚΕΣ ΚΑΙ ΥΔΡΟΓΕΩΛΟΓΙΚΕΣ ΣΥΝΘΗΚΕΣ ΤΗΣ ΠΕΡΙΟΧΗΣ ΤΟΥ ΤΟΠΟΓΡΑΦΙΚΟΥ ΦΥΛΛΟΥ "ΜΟΧΟΣ" (ΚΕΝΤΡΟΑΝΑΤΟΛΙΚΗ ΚΡΗΤΗ)
… ATHIGH ALTITUDES (UP TO 14OO M). SOME VARISKAN METAMORPHIC ROCKS ARE DESCRIBED; THEY HAVE BEEN FOUND, FOR THE FIRST TIME, INSIDE THE PHYLLITE-QUARTZITE UNIT ATCENTRAL-EASTERN CRETE AND SOME CONCLUSIONS HAS BEEN ARRIVED AT, CONCERNING THENATURE (WHAT IT REPRESENTS) OF THE PQ UNIT, AT THE STUDY …
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Some aspects of the geochemistry of gallium in silicate rocks and stony meteorites
… determination of gallium on a routine basis in rocks and meteorites at concentrations down to or less than 1 ppm Ga with a precision (c.o.v.) at the 10 ppm level and above of 1-2% (1s); to apply this technique to the determination of Ga in rocks and meteorites; by critically examining the high …
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The metamorphic sheet and underlying volcanic rocks beneath the Semail ophiolite in the northern Oman mountains of Arabia
… Haybi complex, and consists of sub-ophiolitic metamorphic rocks and serpentinite, alkaline and tholeiitic basalts (the Haybi volcanics), associated with mountain-sized "Exotic" limestones and an Upper Cretaceous sedimentary melange. The rocks of the Haybi complex are bounded by major thrust …
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Magnetic anomalies over a portion of the Granite Mountains, central Wyoming
<p>Precambrian rocks exposed in the northern Pathfinder Reservoir area, Natrona County, Wyoming, are partially exhumed crystalline rocks of the northwestern portion of the Granite Mountains. These rocks comprise three major types: (1) the oldest metamorphic rocks, which may represent a …
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Geology and Petroleum Potential of the Hay Creek Anticline, North-Central Oregon
… that the core of the Hay Creek Anticline exposes metamorphic rocks of Paleozoic or Mesozoic age. On closer study it was found that these rocks consist of only slightly metamorphosed black to dark grey siltstones and sandstones with less abundant chert pebble conglomerate and recrystallized …
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