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Showing 1 to 20 of 63 for “"gabbro"”.

  1. Petrology of the Granville Lake Gabbro

    Cranstone, D. A.1964

    manitoba Repository record

  2. Local mineralogical variations within the layered gabbro of Cape Neddick Maine,

    Dakin, Frances MMassachusetts Institute of Technology1968

    Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.

    mit Repository record

  3. The petrology and geochemistry of the Carrock Fell gabbro-granophyre complex, Cumbria.

    Hunter, R. H.Durham University1980

    durham Repository record

  4. Petrology and Structure of the Gabbro in the Jonesport - Milbridge Area Maine

    Bickford, Marion Eugene, Jr.University of Illinois at Urbana-Champaign2014

    Made available in DSpace on 2014-12-04T19:13:58Z (GMT). No. of bitstreams: 1 6100085.pdf: 4003460 bytes, checksum: 8300655ee282280cc481fc2df2a8332b (MD5) Previous issue date: 1960

    uiuc Repository record

  5. Structural studies and gabbro mylonitization within the Barton Bay Deformation Zone, Geraldton, Ontario /

    Buck, Shane.Brock University1986

    … llneation. The most highly deformed rock is a gabbro mylonite which occurs in the fault zone. The deformation of this gabbro has been traced in stages from a protomylonite to an ultramylonite In which feldspar and chlorite grainslze has been reduced from over 100 microns to as little as 5 …

    brock Repository record

  6. The petrology and mineralogy of the Clinton-Colden gabbro-anorthosite intrusion, Slave Province, N.W.T.

    Macfie, R. I.University of Ottawa (Canada)2009

    ottawa-retro Repository record

  7. The Sheeted Dyke-Gabbro Transition Zone: the Key to Unravelling the Palaeomagnetic Record of the Oman Ophiolite

    Koornneef, Louise Maria Theresia2020

    … upper mantle peridotites, lower crustal gabbros, and upper crustal sheeted dykes and lava flows. Previous palaeomagnetic studies have suggested that the southern massifs of the ophiolite were affected by a large-scale remagnetization event during emplacement, which completely replaced …

    plymouth Repository record

  8. Anorthositic sills of the southern Adirondack Mountains of New York state

    Beddoe, Theresa AnneVirginia Polytechnic Institute and State University1981

    … The Wells Sill consists of a medium-grained gabbro forming the top and basal layers, and an inner core of anorthositic gabbro rimmed by a fine-grained chill margin called the Tenantville facies. The Speculator Sheet consists of gabbroic anorthosite and has a mafic lower margin due to …

    vt Repository record

  9. Plagioclase preferred orientation in layered mylonites : evaluation of flow laws for the lower crust

    Mehl, LucMassachusetts Institute of Technology and Woods Hole Oceanographic Institution2008

    We evaluate the applicability of plagioclase and gabbro flow laws by comparing predicted and observed deformation mechanisms in gabbroic shear zones. Gabbros and layered gabbro mylonites were collected from the Southwest Indian Ridge (SWIR), ODP Hole 735B. Deformation temperatures are constrained …

    woods-hole Repository record

  10. Plagioclase preferred orientation in the layered mylonites : evaluation of flow laws for the lower crust

    Mehl, LucMassachusetts Institute of Technology2008

    We evaluate the applicability of plagioclase and gabbro flow laws by comparing predicted and observed deformation mechanisms in gabbroic shear zones. Gabbros and layered gabbro mylonites were collected from the Southwest Indian Ridge (SWIR), ODP Hole 735B. Deformation temperatures are constrained …

    mit Repository record

  11. Rock differentiation using microwave irradiation

    Mercer, Sean RDepartment of Electrical Engineering1987

    … A considerable amount of barren waste rock, gabbro, is mined along with the diamond bearing kimberlite. No automated method exists for separating the kimberlite from the waste rock and a device was required to effect ore sorting on a rock by rock basis. Experimentation with a microwave oven …

    cape-town Repository record

  12. Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California

    Muller, Edward Robert

    … cumulate clinopyroxenite, and isotropic gabbro. East-west trending mafic-to-felsic aphanitic dikes intrude the plutonic rocks, with high dike concentrations (>80%) in the southern portion of the complex; Gabbro and mafic dikes display subduction-related enrichment of light-ion lithophile …

    unlv Repository record

  13. The petrology, geochemistry and structure of the plutonic rocks of the Oman ophiolite

    Browning, PaulThe Open University1982

    … Plutonic Suites, (ii) the Late Trondhjemite-Gabbro Complexes, (iii) the Late Peridotite-Gabbro Complexes, and (iv) the Late Biotite Granites. The tectonite harzburgite of the Mantle Sequence represents the residuum formed during 177. partial melting of upward flowing fertile spinet lherzolite …

    the-open-u Repository record

  14. Ore sorting using microwave irradiation

    Booi, MlamliDepartment of Electrical Engineering1989

    … a diamond-bearing rock is separated from gabbro which is a waste rock. Work had been conducted previously in the Department of Electrical Engineering at the University of Cape Town to find a viable method for discriminating between gabbro and kimberlite. A technique using microwave …

    cape-town Repository record

  15. Petrogenesis of the phase 1 gabbro-diorite of the Miocene Mt Perkins Pluton, northwest Arizona: Implications for the role of mantle-derived mafic magmas in calc-alkaline magma evolution

    Danielson, Lisa Renee

    … rock of Precambrian orthogneiss. Phase 1 is a gabbro-diorite containing four rock groups: olivine-clinopyroxene cumulates, hornblende-plagioclase cumulates, homblende gabbro, and quartz diorite. Stage one of phases 2 and 3 evolved by a process of fractional crystallization of an asthenospheric …

    unlv Repository record

  16. Petrogenesis of the Moosehorn igneous complex, Maine

    Jurinski, Joseph B.Virginia Tech1990

    … assemblage of olivine norite, hypersthene gabbro, gabbro, biotite ± hornblende diorite, quartz diorite, and granodiorite. Compositional layering is present in many mafic bodies, and most commonly strikes northwest and dips gently to the southwest. The Moosehorn complex was intruded by the …

    vt Repository record

  17. Ο ΠΛΟΥΤΩΝΙΤΗΣ ΤΗΣ ΜΑΡΩΝΕΙΑΣ ΚΑΙ Η ΜΕΤΑΜΟΡΦΙΚΗ ΤΟΥ ΕΠΙΔΡΑΣΗ ΣΤΑ ΠΕΡΙΒΑΛΛΟΝΤΑ ΠΕΤΡΩΜΑΤΑ ΤΗΣ ΦΥΛΛΙΤΙΚΗΣ ΣΕΙΡΑΣ

    Δορυφόρου, ΑικατερίνηNational Technical University of Athens (NTUA)1990

    … A COMPOSITION RANGING FROM MONZODIORITE TO MONZO-GABBRO.THE MONZO-GABBRO COMPOSITION IS DOMINANT. THE PLUTON BELONGS TO THE CALC-ALCALINE ROCK SERIES AND FROM A PETROGENETIC ASPECT IT IS CHARACTERIZED AS AN IGNEOUS ROCK BELONGING TO THE I-TYPE OR MAGNETITE SERIES (M ORIGIN). THE SHALLOW INTRUSION …

    greece Repository record

  18. Geology of the Christmas and Rosillos Mountains, Brewster County, Texas

    Bloomer, Richard Rodier, 1918-University of Texas at Austin1949

    … and non-sodic rhyolite and trachyte, basalt, and gabbro. The Christmas Mountains are an elliptical dome of Devils River limestone probably underlain by a gabbro laccolith which uplifted the limestone about 4,000 feet. The sedimentary formations formerly overlying the Devils River limestone at the …

    texas Repository record

  19. The evolution of oceanic gabbros : in-situ and ancient examples

    Kvassnes, Astri Jæger Sweetman, 1972-Massachusetts Institute of Technology2004

    … from whole-rocks and minerals from the Lyngen Gabbro, a 480-My old dismembered ophiolite from the Scandinavian Caledonides, indicate that this igneous complex was produced from hydrous supra-subduction zone magmas, a remnant of an incipient ocean-arc. Such ophiolites are better models for the …

    mit Repository record

  20. Petrology and contact relationships, SW portion PC Mullen Creek mafic complex, Medicine Bow Mts., Wy.

    Edwards, Jeffrey Scott, author, McCallum, M. E. (Malcolm E.), 1934-, advisor, Burns, L. K., committee member, Warren, C. Gerry, committee memberColorado State University. Libraries1983

    … pyroxenite to anorthosite but were dominantly gabbro and leucogabbro. Most of these rocks underwent regional medium-grade metamorphism to form amphibolite facies assemblages in which hornblende has replaced pyroxene, labradorite has remained stable and relict igneous textures are preserved. A …

    colostate Repository record

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