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Showing 1 to 20 of 32 for “"Granitic rocks"”.
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Granitic Rocks of Ophiolites
… petrography and chemical composition of granitic rocks (plagiogranites) and associated formations in five ophiolites are described. In addition, the occurrence of similar rocks in other ophiolites, some island arcs and in the ocean crust is reviewed. Plagiogranites in ophiolites can be …
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Partial melting relationships of three granitic rocks,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1969.
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Petrology and geochemistry of granitic rocks : Cape Ann, Massachusetts,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1972.
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Evaluation of Fracture Flow at the Coles Hill Uranium Deposit in Pittsylvania County, VA using Electrical Resistivity, Bore Hole Logging, Pumping Tests, and Age Dating Methods
… west of the Chatham Fault, which separates the granitic rocks of the Virginia Piedmont to the west from the metasediments of the Danville Triassic basin to the east. Groundwater at the site flows through a complex interconnected network of fractures controlled by the geology and structural …
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Geology & Geochemistry of the Kingman Feldspar, Rare Metals and Wagon Bow Pegmatites
… syn- to post-collisional Paleoproterozoic granitic rocks. The slightly older Cerbat plutons are associated with the suturing of the Mojave and Yavapai terranes whereas Aquarius granites were emplaced during the Yavapai Orogeny as the sutured terranes docked with North America. A detailed …
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Garnet-biotite thermometry, garnet-aluminum silicate-silica-plagioclase barometry, and Emp monazite geochronology of the early Proterozoic Ivanpah Mountains, eastern Mojave Desert, Se California
… garnets (2250--5000um). Matrix monazite from granitic rocks indicate magmatism may have occurred between 1559 +/- 31 Ma and 1416 +/- 28 Ma. Large garnets effectively shield monazite from Pb-loss when temperature is exceeded above what is considered its closure-T for radiogenic-Pb …
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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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Geology of the Suapure River area, NW Guiana Shield, Venezuela
… the Cuchivero Group (Caicara Formation rhyolitic rocks, Santa Rosalía biotite granites and San Pedro leucogranites) and the Suapure Group, (Pijiguao leucogranites and Parguaza rapakivi granites). Radiometric ages by Rb-Sr whole rock isochron method (Hurley and others, 1973) for these rocks are as …
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Petrography of xenolith zones in the Black Face-Ames plutons, western San Juan Mountains, Colorado
… contains xenoliths of shale, quartzite, and granitic rocks, ranging in diameter from 2 cm to 5.4 m. The other zone is exposed near Ames, where xenoliths of amphibole-pyroxene rocks, mafic schists, and occasional granites occur, ranging in diameter from 2 cm to J.6 m.</p> <p>Measurements near …
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Geological and geochemical aspects of the Loch Loyal Alkaline Complex, Sutherland
… and to deformation of the surrounding country rocks. Core rocks crystallized as a one-feldspar type and outer laminated syenites as a two-feldspar assemblage. A pegmatitic phase was succeeded by low-temperature hydrothermal mineralisation and considerable deuteric activity in which strontium …
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Geology of the Hanover Academy and Ashland quadrangles, Virginia
… lie astride the Fall Line. Metamorphic and granitic rocks of the Piedmont Province to the west of the Fall Line are pre-Triassic in age. Biotite gneiss, granite gneiss, muscovite-biotite schist, amphibolite, and Petersburg Granite are represented. Along the eastern margin of the Piedmont a …
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Duality of magmatism at Kirkland Lake, Ontario, Canada.
… The occurence of two distinct suites of magmatic rocks, syenitic and granitic, in and around the KLF indicates a magmatic duality. It is possible to identify three distinct magmatic domains defined by mode of emplacement, minerology and geochemistry. Mineral chemistry indicates that rocks from …
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Using the Finite Discrete Element Method (FDEM) to Correlate Simulated Microfractures to Acoustic Emissions in Brittle Anisotropic Rock
… Brazilian Tensile Strength (BTS) tests on three granitic rocks from the Pointe du Bois Pluton, Manitoba, Canada. The same laboratory tests are then recreated as FDEM models, in which finite elements are permitted to separate from each other, thus allowing damage propagation to be tracked in …
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Beryllium-10 derived erosion rates from the Hangay Mountains, Mongolia: landscape evolution in a periglacially-dominated continental interior
… location to use beryllium-10 because of the granitic rocks that provide the quartz needed for cosmogenic analysis as well as the lack of observed evidence of recent or old mass wasting events that mobilize sediment and bedrock with much lower cosmogenic concentrations that cause …
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The Construction of a Plutonic Complex in a Continental Arc Setting: The Skookum Butte Stock, Western Montana
… averaging 59 wt % and are metaluminous. The granitic main-phase melt of the SBS is felsic (63.99-73.82 wt % SiO2) and slightly peraluminous (alumina saturation index = 1.04). There are two distinct felsic members represented by biotite-muscovite and biotite-hornblende granitic rocks that …
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The Construction of a Plutonic Complex in a Continental Arc Setting: The Skookum Butte Stock, Western Montana
… averaging 59 wt % and are metaluminous. The granitic main-phase melt of the SBS is felsic (63.99-73.82 wt % SiO2) and slightly peraluminous (alumina saturation index = 1.04). There are two distinct felsic members represented by biotite-muscovite and biotite-hornblende granitic rocks that …
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Mineral Ridge: A Late Cretaceous Orogenic Gold System in the Miocene Silver Peak-Lone Mountain Metamorphic Core Complex
Gold deposits in rocks of the Silver Peak metamorphic core complex in west-central Nevada are contained in highly deformed, sheeted milky quartz veins that cut Neoproterozoic metasedimentary rocks and Cretaceous peraluminous granite and migmatite. Gold production at Mineral Ridge since discovery in …
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Petrology and alteration in the core of the Bear Lodge Tertiary intrusive complex, Bear Lodge Mountains, Crook County, Wyoming
… dikes cut across the core. Precambrian granitic rocks and lower Paleozoic sedi mentary rocks flank the intrusion and occur as xenoliths.</p> <p>The latite is relatively unaltered and consists mostly of oligo clase, andesine, alkali feldspar, salite, and hastingsite phenocrysts in an …
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GEOLOGY, GEOCHEMISTRY, AND TECTONIC IMPLICATIONS OF THE SALMON CREEK VOLCANIC SEQUENCE, OWYHEE MOUNTAINS, IDAHO
… southwestern Idaho are constructed of Cretaceous granitic rocks of the Idaho batholith and thick sequences of Cenozoic volcanics. Igneous rocks in these mountains record a fundamental transition of tectonic regimes in their systematic changes of magmatic style and composition through time. …
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Structural analysis of some pre-Cape formations in the Western Province
… structural or tectonic aspects of the pre-Cape rocks. In the Worcester area, it was found that the structural sequence across the so-called Malmesbury-Klipheuwel unconformity (de Villiers, Jansen and Mulder, 1964) is the reverse of that previously postulated, and the controversial correlation of …
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