 | | Journal (article/letter/editorial) | | Processes in Mafic Magma Chambers: I. The Kiglapait Intrusion, Labrador by DONALD J. DEPAOLO Department of...cumulate rocks and minerals of the Kiglapait intrusion are pertinent as indicators of the processes that...indicates that the crystallization age of the intrusion is 1305 Âą22 million years. The initial em values...5-6 in the Upper Zone and correlate with the anorthite content of plagioclase. The initial 87Sr/86Sr...monotonically up-section (decreasing plagioclase anorthite content) to 0-7068 in the Upper Zone. These variations |  | | Journal (article/letter/editorial) | | Easter I. volcanic complexes and on the Bushveld, Muskox, Kiglapait, Guadalupe, Duluth, Nain, Egersund,...from Mull, Skye, Ardnamurchan and the Skaergaard intrusion are all abnormally depleted in 0 is relative to...pyroxene. The later differentiates of the Muskox intrusion are markedly O~S-rich, but this is not a result...Southern California batholith and in the Skaergaard intrusion, east Greenland, are relatively well understood...Whole rock 6.8 ⢠0.2 (2) Clear Lake volcanic area, Lower Lake quadrangle, Cali/ornia. (See A~DERSO~ |  | Rivalenti, G., Garuti, G., Rossi, A., Slena, F., Sinigoi, S. (1981) Chromian spinel in the Ivrea-Verbano layered igneous complex, western Alps, Italy. TMPM Tschermaks Mineralogische und Petrographische Mitteilungen, 29 (1). 33-53 doi:10.1007/bf01082813 | Journal (article/letter/editorial) | | therefore, to be the geotectonic environment of intrusion. Zusammenfassung Chrom-Spinell im geschichteten...der bei relativ0hohem Druck (8 kbar) erfolgten Intrusion, zuriickzufNaren ist. 3 TMPM29/1 0 0 4 1 - 3 7...Chromerzlagerst/itten ist also das geotektonische Milieu der Intrusion. Introduction The Ivrea-Verbano Complex, belonging...recognized as a deep-seated, possibly multiple, intrusion (Rivalenti et al., 1975; Rivalenti et al., 1980;...274 ppm at Stiliwater (Hess, 1960); 547 ppm at Muskox (Smith and Kapp, 1963). This suggests that primitive |  | | Journal (article/letter/editorial) | | Territories Geoscience OfďŹce, Box 1500, Yellowknife, NT, Canada X1A 2R3 Department of Earth Sciences, Carleton...University, 1125 Colonel By Drive, Ottawa, ON, Canada K1S 5B6 c Yale University, 210 Whitney Avenue,...of sills, dykes and lavas distributed over a vast area extending from Wyoming in the south to the Wopmay...Orogen and the Mackenzie Mountains of Northwest Canada. Thick (â¤100 m) sills and rare dykes in Wopmay...Newfoundland and Labrador, St. Johnâs, Newfoundland, Canada A1B 4J6. Tel.: +1 709 727 3721; fax: +1 709 729 |  | | Journal (article/letter/editorial) | | fractionation representedin the Lower Zone of the Olifants River trough and is not the product of a separate, later...256 KT, Mooi- Complexextendsfrom the Olifants River to the hoek 255 KT, Onverwacht292 KT, and Zeekoegat...Rietfontem Richmond 38. Thorncliffe 39. Helena River KT 372 KT 373 375 KT 370 KT 374 KT C:â˘JT...sectorof the Eastern BushveldComplex (Fig. 1), the area discussedin the presentpaper. Hall describedrock...the generalgeol- Smith (1967, 1969) for the Muskox intrusion, was ogy of the Critical Zone in the northernpart |  | | Book | | A. T. N. IRVINE, Geological Survey of Canada, Ottawa, Canada E. D. JACKSON, U.S. Geological Survey,...S.A. C. H. SMITH, Geological Survey of Canada, Ottawa, Canada Contributors vi H. SORENSEN, Universitetets...Bhattacharji, Geological Survey of Canada, and the National Research Council of Canada. T. N. Irvine: J. A. Noble...The ultramafic rocks of the Muskox intrusion, Northwest Territories, Canada By T. N. Irvine and C. H. Smrru...dunite Structures in the dunite Serpentinization Intrusion of the dunite mass > QAmMOOW Conclusions 160 |  | | Report (issue) | | Southeastern Alaska T. N. IRVINE Geological Survey of Canada 601 Booth Street Ottawa, Ontario 1974 Copyright...oc Chapter II. General geology of the Duke Island area...................00..0cccceeceeueeeuecerseceusces...elacion ee URE ea eee eee EE Chapter V. Hornblende-anorthite pegmatite, amphibolite adjoining the ultramafic...45 45 46 48 48 49 49 Sil 3)3) A. Hornblende-anorthite pegmatite... o...-esceeceeea serie tee ceases...MLE omega 6. Southern boundary of the younger intrusion..................cccccccesseeeeeeecececeeseeeaees |  | | Book | | silica content, or locality within a specified area of the Earthâs crust would lead to the recognition...particularly in the case of the Skaergaard layered intrusion (Wager and Deer, 1939; Wager and Brown, 1968)...reference to the Rhum intrusion (Brown, 1956). It was proposed that a layered intrusion could lie beneath...(Roedder and Weiblen, 1971) and of the Skaergaard intrusion (McBirney, 1975); and from silicate-liquid immiscibility...McBirney, A. R., Differentiation of the Skaergaard intrusion, Nature, 253, 691 â 694,1975. Nesbitt, R. W., |  | | Journal (article/letter/editorial) | | 80 60 40 20 0 SECTION MOUNTAIN VIEW ' METERS FEET AREA THICKNESS. 0T° IN FEET (a) Bronzite ^ cumulate...FORMATION IN STILLWATER COMPLEX (b) 957 MOUNTAIN VIEW AREA * ubcrÂť FEET K METERS -0 EXPLANATION OC' be...cumulus minerals in cyclic unit 2 in the Mountain View area of the Stillwater Complex. Modified after Jackson...section of the cyclic units in the Mountain View area after Jackson (1968). Downloaded from http://petrology...Peridotite zone is ~ 1250 m thick in the Mountain View area. If that thickness represents ~ 5 % fractional crystallization |  | | Journal (article/letter/editorial) | | Geoscience Studies, Carleton University, Ottawa, Canada Platinum-Group Minerals and Other Solid Inclusions...plotted on Fig. 3. Laurite analyses from the Bird River Sill, Manitoba, Stillwater Complex, and Big Trout...examined, but they have been identified from the Bird River Sill. According to the classification of Harris...Montana, ~ Crystal Lake Gabbro, Ontario, 9 Bird River Sill, Manitoba, | Bushveld Complex, South Africa...Montana, -~g Big Trout Lake Complex, Ontario, 9 Bird River Sill, Manitoba usually magnesium-, nickel- and |  | | Journal (article/letter/editorial) | | University, Kingston, Ontario, Canada R. F. EMSLi~ Geological Survey of Canada Received August 19, 1970 Abstract...kindly supplied by C. Smith, Geological Survey of Canada, and B. Evans, University of California, Berkeley...Oxide); ⢠Osborn and Tait (Forsterite---Diopside--Anorthite) ature of a liquid of composition A can be lowered...National Research Council of Canada and the International Nickel Company of Canada and is gratefully acknowledged... Emslie, R. 1~.: The Michikamau Anorthositic Intrusion, Labrador. Can. J. Earth Sciences 2, 385-399 (1965) |  | | Report (issue) | | Glacier cumulates3. Map of the Brady Glacier cumulate area showing location of nunataks, drill holes, and cross...Brady Glacier cumu lates. The La Perouse gabbro intrusion was called the Crillon-La Perouse stock by Rossman...the main outer contact of the La Perouse gabbro intrusion; whereas the contact northwest of the nunataks...and surrounding country rocks. Rectangular box (area of fig. 3) shows location of the Brady Glacier cumulates..._J 500 METERS FIGURE 3.âBrady Glacier cumulate area showing location of nunataks, drill holes, and cross |  | | Journal (article/letter/editorial) | | Finger Structures in the Lille Kufjord Layered Intrusion, Finnmark, Northern Norway B. Robins Geologisk...two of the cyclic units of the Lille Kutjord intrusion. The upwardly-directed peridotite "fingers" crosscut...Lille Kufjord layered gabbro is a synorogenic intrusion emplaced at a late stage in the Caledonian (Finnmarkian)...(Robins and Gardner 1974; Sturt et al. 1978). The intrusion displays a subalkaline layered sequence some 1...disequilibrium processes during the evolution of the intrusion. These structures are described here and compared |  | | Book | | Variance 31 31 35 x Contents 5. Diopside and Anorthite: Supposedly a Binary Eutectic System Introduction...Melting of Diopside (Di) Preparation and Melting of Anorthite (An) Preparation of Di-An Mixtures T-X Plots:...Plots: Liquidus and Solidus Diopside-Anorthite as a Binary System Variance in Di-An The Lever Rule Nature of...Trends Petrologic Considerations 8. Diopside-Anorthite-Albite Introduction Properties of Triangles Deduction...Paths Equilibrium Paths 9. Forsterite-Diopside-Anorthite: A Basaltic Analog Introduction Preparation and |  | | Journal (article/letter/editorial) | | and a Cr-spinel seam in the Rum Eastern Layered Intrusion, NW Scotland Brian O'Driscoll a,â, Colin H. Donaldson... units that comprise the Rum Eastern Layered Intrusion. In some cases, âsubsidiaryâ Cr-spinel seams have...completely melted troctolite, formed by growth of high-anorthite zones from the contaminated picrite onto residual...Crspinel following magma mixing at the roof of the intrusion, whereas Mondal and Mathez (2007) propose that...regarded as a classic example of a layered maďŹc intrusion that formed by opensystem magmatic differentiation |  | | Journal (article/letter/editorial) | | oscillatory zoning. These plagioclase crystals are more anorthite-rich (to An 25+) than poikilitic plagioclase (ca...Nunarssuit syenite and the Ilimaussaq alkaline intrusion which present many contrasting features. Layering...petrographically similar syenite of the Klokken intrusion the bands are concentrations of mafic minerals...Part of the nepheline syenite of the Grlnnedal intrusion is characterized by extreme feldspar lamination...scattering could be used to estimate the surface-area concentration and composition of airborne dust causing |  | | Journal (article/letter/editorial) | | Abstract. The chilled margins of the Michikaman, Muskox, Skaergaard, and Bushveld intrusions were experimentally...Methods Samples of the chilled margins of Michikamau, Muskox, Skaergaard, and Bushveld intrusions were remelted...technique (Eugster and Wones, 1962). Miehikamau Intrusion A drill core s a m p l e (EC66-21Ad, d o n a t...present in the chilled margin of the Michikamau intrusion at ~tmospherie pressure and various ]o~ -10 -8...Brown (196g). MX, sample SDC59-1050D from the Muskox intrusion 25 feet from contact supplied by T.N. Irvine |  | | Journal (article/letter/editorial) | | gabbrosampleandâ˘3 to 81 ppb in the other 29 samAlong the Indus River valley, the Main Mantle pies,which are mostlychromitites...(Jan,1988). out over an area of about 10,000 km2 and are the In the Indus River valley, the uppermostof...inferred cumulus arrival arrival Ă Jijal village ⢠river .------. stream â˘. igneous layering igneousfoliation...relict igneousmodal layering.The top of the third intrusion,the Patan Complex(Fig. 1), is a spectacular,intrusive...andplagioclase (Fig. 2); (2) crossbedding;q-3 anorthite= 2 grossular q-pyropeq-3 quartz,and (3) appar |  | | Journal (article/letter/editorial) | | is an extremely differentiated, layered, basic intrusion, synorogenically emplaced at 5-6 kb in the allochthonous...Fongen-Hyllingen complex is a synorogenic layered basic intrusion of Caledonian age. It has been suggested that...(1973) and Olesen (1974) in the northern part of the area, and by Kisch (1962) and Nilsen (1973) in the southern...southern part of the area shown in Fig. 1, within the contact aureole of the intrusion. Contact metamorphism...to biotite grade (Olesen et al, 1973) before intrusion of the Fongen-Hyllingen complex, and the peak |  | | Journal (article/letter/editorial) | | 00 Petrology of the Proterozoic Potato River Layered Intrusion, Northern Wisconsin, USA by KENNETH W....DeKalb, Illinois 60115 ABSTRACT The Potato River intrusion is a Keweenawan (1100 Ma) mafic pluton emplaced...rocks of the Picritic zone indicate that the intrusion was open to additional injections of mafic magma...liquids intruded along the upper margin of the intrusion during regional tilting, but Roof zone granitic...aluminous, which suggests that the upper part of the intrusion has been enriched in plagioclase by convection-aided |  | Latypov, Rais, Morse, Tony, Robins, Brian, Wilson, Richard, Cawthorn, Grant, Tegner, Christian, Holness, Marian, Lesher, Charles, Barnes, Steve, OâDriscoll, Brian, Veksler, Ilya, Higgins, Michael, Wilson, Allan, Namur, Olivier, Chistyakova, Sofya, Naslund, Richard, Thy, Peter (2015) A fundamental dispute: A discussion of âOn some fundamentals of igneous petrologyâ by Bruce D. Marsh, Contributions to Mineralogy and Petrology (2013) 166: 665â690. Contributions to Mineralogy and Petrology, 169 (2) doi:10.1007/s00410-015-1108-9 | Journal (article/letter/editorial) | | du QuĂŠbec Ă Chicoutimi, Chicoutimi, QC G7H2B1, Canada O. Namur Institute of Mineralogy, Leibniz Universitat...extended to other subsystems, most notably diopsideâanorthiteâalbite (Bowen 1915). Bowen (1913, 1915) showed...7 in Latypov 2009). Marsh misinterprets this intrusion as being compositionally uniform. He excludes...mineral variations exhibited by the Skaergaard intrusion and many other layered intrusions, that are simply...Brown were aware that in the case of the Bushveld intrusion, it was âunlikely that the act of magma injection |  | | Journal (article/letter/editorial) | | focus on Crâspinel from the Rum Eastern Layered Intrusion, Scotland Julien Leuthold1,2 ¡ Jonathan D. Blundy1...on picritic parental liquid to the Rum layered intrusion, Scotland. For picrite-only experiments at fO2...experimental results to the Rum Eastern Layered Intrusion, we propose a model for the precipitation of spinel...clinopyroxene chemistry. Keywords Rum layered intrusion ¡ Cr-spinel ¡ Gabbro melting ¡ Troctolite melting...crustal pyroxenite and gabbro by picrite melt intrusion. However, the most widely accepted model involves |  | | Journal (article/letter/editorial) | | in South Africa is the worldâs largest layered intrusion. The successive emplacement of magmas into the...1991) in the Marikana area, (Markgraaff, 1976; Nex et al. 1998), and in the Brits area (Mitchell, 1996),...uninterrupted differentiation sequence to the top of the intrusion, led Kruger (1990) to propose the PM as the base...composition just below the FIG. 1. Map of the Marikana area showing the location of quarries and boreholes from...Complex containing a detailed section of the Marikana area. 835 P. A. M. NEX ETAL. FIG. 3. Photograph of |  | | Journal (article/letter/editorial) | | Paleocene Sifton Range volcanic complex, Yukon, Canada Aleksandar MisĚkovicĚ *, Don Francis Department...University, 3450 University Street MontreĚal, QueĚbec, Canada H3A 2A7 Received 1 May 2004; accepted 25 May 2005...and pyroclastic rocks comprise 40% of the SRVC by area (95 km2), and total c.a. 65 km3 of preserved volcanic...the foreground represent an epizonal granitic intrusion of the Nisling Plutonic Suite. The cirque floors...rhyolite dykes radiates from the shallow granite intrusion, particularly in the western part of the complex |  | | Journal (article/letter/editorial) | | Origin of the Chrome-Spinel of the Rhum Layered Intrusion P. HENDERSON Department of Geology, Chelsea College...chrome-spinel bearing rocks from the layered ultrabasic intrusion of Rhum indicate that in situ reaction of chromite...the chrome-spinels vary throughout parts of the intrusion and also in a systematic way across a thin picotite...The eastern part of the rhythmically layered intrusion of R h u m was studied b y Brown (1956). He showed... sparsely distributed throughout most of the intrusion and as thin concentrations at some of the junctions |
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