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Showing 1 to 20 of 32 for “"Pegmatites"”.
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Petrogenesis of the Spruce Pine pegmatites, North Carolina
Pegmatites in the Spruce Pine district, North Carolina, are an example of muscovite class pegmatites that were derived from differentiation of a magma. There are eight granodiorite plutons in the Spruce Pine area ranging in size from 1 to 20 square kilometers that contain and are surrounded by …
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Selective flotation of the mineral components of the pegmatites
Includes bibliographical references.
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Geology & Geochemistry of the Kingman Feldspar, Rare Metals and Wagon Bow Pegmatites
… district, located in northwestern AZ, numerous pegmatites intrude 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 …
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Fluid inclusion and trace element studies of the gem pegmatites of Mt. Antero, Colorado
The gem pegmatites of Mt. Antero, Colorado occur in an Oligocene granitic stock containing aquamarine, smoky, clear and milky quartz, phenakite, muscovite, fluorite, garnet, pyrite, topaz and calcite. Aquamarine and smoky quartz contain abundant primary fluid inclusions outlining growth zones, as …
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Petrogenesis and geochemistry of kyanite-bearing pegmatites in the Buncombe Pegmatite District, North Carolina
… This study investigates a set of kyanite-bearing pegmatites that represent a case in which kyanite crystallized directly from melt. The pegmatites intrude spinel orthopyroxene hornblendite in the Buncombe Pegmatite District in the Eastern Blue Ridge of North Carolina. One site was studied in …
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LITHIUM ENRICHMENT IN ANATECTIC PEGMATITES: NEW INSIGHTS FROM THE THERMOMETAMORPHIC AUREOLE OF THE ADAMELLO BATHOLITH
… composition of the migmatites-hosted LCT pegmatites. Whole rock Sr-Nd isotopic data confirm that the Li-rich pegmatites of the Forcel Rosso area are indeed crustally derived, marking them as produced by direct anatexis of metapelites. They also show that they were formed by two melt …
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An Investigation of the Minor Element Content of Potash Feldspar From Pegmatites, Haystack Range, Wyoming
Made available in DSpace on 2014-12-04T19:14:11Z (GMT). No. of bitstreams: 1 6200569.pdf: 2671903 bytes, checksum: d23514ca1db519f515c48d0c5427fea2 (MD5) Previous issue date: 1961
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Mineralogy and Geochemistry of Anorogenic Granitic Miarolitic Pegmatites Associated with the White Mountain Intrusive Suite, New Hampshire
<p>Subvolcanically emplaced granitic, miarolitic pegmatites associated with the White Mountain Igneous Province (WMIP), New Hampshire, were sampled and analyzed using modern analytical techniques including X-ray fluorescence, electron microprobe, scanning electron microscopy, and direct-coupled …
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Role of Li and B bearing fluids in crystallization and alteration of granitic pegmatites, San Diego, California
The San Diego County pegmatites occur in the Mesozoic Peninsular Ranges Batholith that stretches from southwestern California to Baja California, Mexico. These zoned, lithium-cesium-tantalum type pegmatite dikes intruded between 2 and 3 kbar and thus contain miaroles, or "pockets," that may contain …
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Cassiterite in synsedimentary, massive sulfide deposits: a comparison to cassiterite in "granite-affiliated" tin deposits including pegmatites
Includes bibliographical references (pages 122-129).
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Lineament and pegmatite mapping using landsat TM imagery and aerial photograph data: Kaseba-Katota Area, Serenje district, Central Zambia
… dominant joint pattern strikes between 30° -80°.Pegmatites in the Kaseba-Katota area commonly occur as lensoids and rarely form extensive and continuous tabular bodies. Most of the pegmatites in the belt are small, varying from 10 to 50 m in length and usually form small hills rising above the …
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The Fraser Lakes Zone B U-Th-REE deposit and its host rocks : implications for pegmatite- and leucogranite-hosted U-Th-REE deposits in northern Saskatchewan, Canada
… Canada. Here, a number of variably radioactive pegmatites and leucogranites intruded the highly sheared, unconformable contact between Paleoproterozoic Wollaston Group metasedimentary rocks and the underlying Archean orthogneisses, in a NNE-plunging antiformal fold nose. The U-Th-LREE …
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Trace element behaviour in a LCT-pegmatite with rare-element mineralization : the Luolamäki pegmatite, a case study
… evolving technological applications the role of pegmatites has risen to an unexpected level. As pegmatites are hosts for rare-element mineralization’s they are mined extensively throughout the world. As a result of the transition to more ecological solutions in propulsions the need for large …
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Analysis of the Cabin Canyon shear zone in the Virgin Mountains : implications for an early accretionary province boundary and later transpressional zone.
… which boudinaged the amphibolites and original pegmatites causing dramatic grain size reduction (mylonitization). This transpressional deformation created sub-horizontal lineations and shear sense indicators such as delta and sigma porphyroclasts, shear bands, C-S fabrics, and bookshelf sliding. …
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Gahnite and its formation in the context of regional metamorphism and mineralization in the Namaqualand metamorphic complex
… sulphide deposits, and also occurs in marbles, pegmatites and quartz veins. Its formation has been attributed to the breakdown of Zn-staurolite or desulphidation of sphalerite during metamorphism. The stability of zinc-rich spinels under a wide range of metamorphic conditions in a variety of …
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Mineralogy and Geochemistry of the Dumper Dew Pegmatite, Oxford County, Maine
… of magmatic differentiation relative to other pegmatites in the area.
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The regional tectonism of the gneisses of part of Namaqualand
… culminated in the emplacement of granites and pegmatites when open folds formed. The pegmatites occur along an east-west belt to the north of the present area, separating the Namaqualand gneisses from the less-recrystallised rocks farther north. This thermal event, thought to be responsible for …
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The magmatic-hydrothermal fluid history of the Harrison Pass Pluton, Ruby Mountains, NV: implications for the Ruby Mountains-East Humboldt Range metamorphic core complex and Carlin-type Au deposits
… of CTD's. Field and petrographic observations of pegmatites, aplites, miarolitic cavities, quartz veins, and multiple types of hydrothermal alteration, coupled with data from fluid inclusion microthermometry, LA-ICP-MS fluid inclusion geochemistry, and oxygen stable isotopes from magmatic and …
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Geological and geochemical aspects of the Loch Loyal Alkaline Complex, Sutherland
… mineral polycrase occurs within the pegmatites contrary to a suggestion byPavlenko et. ale that such minoralo arc absent from sphene-orthite typo granitoids. Tho other alkaline intrusions in Sutherland, Loch Ailsh and Loch Borralan, were found to differ in trace-element chemistry from …
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Petrology and tectonic setting of relatively low temperature eclogites and related rocks in the Dalsfjord area, Sunnfjord, West Norway.
… to monzonitic orthogneisses, paragneisses and pegmatites. The latter is separated from the overlying unit by a zone of protomylonites. Eclogites are found in all the units. Gradational or intrusive relationships show that all the units are mutually autochthonous. Many eclogites had demonstrable …
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