 | | Journal (article/letter/editorial) | | NorthernIreland Crystallization sequences in the Muskox intrusion and other layered intrusions-II. Origin of...occasions when the basic parental magma of the intrusion is suddenly extensively contaminated with granitic...crystal-field stabilization energy. experimental data on forsterite-picrochromite crystallization relations in the...differentiation patterns of Cr and Wi in the Muskox intrusion. The granitic melt is produced because most...most of the crystals formed in the intrusion accumulate on its floor, leaving the roof rocks to be continuously |  | | 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 Ā±22 million years. The initial em values...The assimilation efficiency of the Kiglapait intrusion is not tightly constrained, but appears to be...igneous intrusions, including the Skaergaard intrusion (Wager & Deer, 1939; Wager, 1960, 1963;McBirney |  | Djon, Lionnel M., Miller, James D., Olivo, Gema R., Peck, Dave C. (2017) Petrogenesis of Cyclic Units In the Northern Ultramafic Center of the Lac Des Iles Complex, Ontario, Canada. The Canadian Mineralogist, 55 (2) 349-374 doi:10.3749/canmin.1600063 | Journal (article/letter/editorial) | | ULTRAMAFIC CENTER OF THE LAC DES ILES COMPLEX, ONTARIO, CANADA LIONNEL M. DJONĀ§ Queenās University, Department...Geological Engineering, Kingston, Ontario K7L 3N6, Canada JAMES D. MILLER Department of Earth and Environmental...Geological Engineering, Kingston, Ontario K7L 3N6, Canada DAVE C. PECK North American Palladium Ltd, 10th...10th Avenue, Thunder Bay, Ontario P7B 2R2, Canada ABSTRACT Lithologic, mineralogical, and geochemical...Lac des Iles Complex, ultramaļ¬c rocks, layered intrusion, Superior Province. Ā§ Corresponding author e-mail |  | 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) | | Campus, University of Toronto, Mississauga, Ontario, Canada L5L 1C6 salts of the British Tertiary Province...Carlson etal. (1981) have shown that the Columbia River basalts display a wide range of isotopic values...North American diabase 5 1 . 1 % , and Columbia River basalts 50.0 to 54.4% (all data from Carmichael...are LREE enriched. Examples include the Columbia River basalts (Carlson 1984), Sudbury-Nickel Irruptive...Complex (Salpas et al. 1983), the Jimberlana Intrusion (Campbell 1983) and the Bushveld Complex (Cawthorn |  | | 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 |  | | 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 ā¢ 0.2 (2) Clear Lake volcanic area, Lower Lake quadrangle, Cali/ornia. (See A~DERSO~ |  | | Journal (article/letter/editorial) | | University, Kingston, Ontario, Canada R. F. EMSLi~ Geological Survey of Canada Received August 19, 1970 Abstract...that there is complete solid solution between forsterite and fayalite, and that in most parts of the system...expressed the change in the freezing point of forsterite and fayalite in terms of the temperature and...(5) ~For O1r represents the mole fraction of forsterite (MgSi0.502) in the olivine Where X~o solid solution...Bradley found that the phase diagram for the forsterite--fayalite system calculated from Eqs. (4) and |  | | Journal (article/letter/editorial) | | JAMBOR and CHARLES H. SMITH Geological Survey of Canada, Ottawa [Read 30 January 1964] Summary. Olivine...in detail the cooling history of an ultramafic intrusion. The determinative methods in use have not lent...establishing the composition of olivine in the forsterite-fayalite series is a relatively new but 1 Canadian...relatively intense and uniform throughout the forsterite-fayalite series. Moreover, the 174 reflection...reflection changes about 7 ~ 20 between forsterite and fayalite and the spacing is thus sufficiently affected |  | | Journal (article/letter/editorial) | | Geoscience Studies, Carleton University, Ottawa, Canada Platinum-Group Minerals and Other Solid Inclusions...ophiolites. For these occurrences, olivine has high forsterite (Fo96) and nickel contents (up to 0.78 wt.%)...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 |  | | Book | | silica content, or locality within a specified area of the Earthās 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 ā 694,1975. Nesbitt, R. W., |  | | Journal (article/letter/editorial) | | recrystallization in the Western Laouni mafic intrusion, Algeria J.P. Lorand a and J.Y. Cottin 2 1 Laboratoire...olivine orthocumulates from the Western Laouni intrusion (Southern Hoggar, Algeria) contains inclusions...igneous complexes of continental area (Bushveld, South Africa; Muskox, Canada and Stillwater, USA). In the...Bushveld complex is included in chromite from the Muskox intrusion (Irvine 1975), while phlogopite inclusions...and Von Gruenewaldt 1985). The Western Laouni intrusion provides the opportunity to assess these models |  | | Report (issue) | | Glacier cumulates3. Map of the Brady Glacier cumulate area showing location of nunataks, drill holes, and cross...Brady Glacier cumuĀ 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.āBrady Glacier cumulate area showing location of nunataks, drill holes, and cross |  | | 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:ā¢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 |  | | 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 |  | | Journal (article/letter/editorial) | | 80 60 40 20 0 SECTION MOUNTAIN VIEW ' METERS FEET AREA THICKNESS. 0TĀ° IN FEET (a) Bronzite ^ cumulate...FORMATION IN STILLWATER COMPLEX (b) 957 MOUNTAIN VIEW AREA * ubcrĀ» 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) | | east of the River Nile (Fig. 1). Like many Precambrian exposures in North Africa, the area was intruded...1964). In Egypt, this orogeny culminated with the intrusion of K-rich granites in the period 574-595 Ma (Fullagar...have been recognized in the Archean shields of Canada (Macrae 1969; Pyke et al. 1973; Arndt 1977), South...similar sills and lavas in the Cape SmithWakeham Bay area of New Quebec (Miller 1978; Francis and Hynes 1979)...metasediments forms the oldest rock unit in the Dahanib area (Fig. 1). Gabbroic to ultramafic intrusions are |  | | Report (issue) | | by analogy to valleriite. (2) Dumont property, Canada; by electron microprobe, (OH)1ā calculated; corresponds...pyrrhotite, forsterite, clinohumite, hydromagnesite, graphite, calcite (Bancroft, Canada). Distribution:...Cornwall open pit, Lebanon Co., Pennsylvania, USA. In Canada, in the Stephen Cross and Maxwell quarries, near...Dumont property, near Amos, Quebec; in the Muskox intrusion, Northwest Territories; from near Bancroft |  | | Book | | and Equilibrium Paths Equilibrium Paths 9. Forsterite-Diopside-Anorthite: A Basaltic Analog Introduction...Preparation and Melting of Forsterite 1\vo Sidelines: Forsterite-Diopside and Forsterite-Anorthite Treatment...Liquid Field 10. Incongruent Melting: The System Forsterite-Silica Introduction Incongruent Melting of Enstatite...143 144 145 146 151 152 154 156 156 157 159 Forsterite-Anorthite-Silica: Incongruent Melting in a Ternary...Related Rocks 12. xi 164 171 174 174 176 Forsterite-Diopside-Silica: Pyroxenes and Their Reactions |  | | Journal (article/letter/editorial) | | curve shows shifts o f up to 20 mol.% forsterite. In a natural intrusion, there m a y be a continual gradation...Africa is attributed by Lightfoot et al. (1984) to intrusion of successive batches of less fractionated magma...liquid to a Bushveld or Stillwater - type layered intrusion, and a komatiite. 527 Figure 3 shows model trends...relation to the overall magmatic evolution of the intrusion. As an example of this, consider the case Model...relative to contacts between cyclic units in the Muskox Intrusion. This model, depending on wholesale upward |  | | Journal (article/letter/editorial) | | and western Bushveld Complex. Multiple magma intrusion is the only satisfactory hypothesis for this feature...zones in the eastern Bushveld and the Pilanesberg intrusion in the western Bushveld provide natural boundaries...Gruenewaldt 1977), Union Section and in the Boshoek area (Cousins and Feringa 1974) (Z, U and B respectively...the enstatite content of orthopyroxene and the forsterite content of olivine in a 500 m thick sequence...With the exception of the entropy of fusion of forsterite all the data necessary to calculate the effect |  | | Journal (article/letter/editorial) | | (Accepted 6 February 2012) The Panzhihua layered intrusion hosts a giant VāTiāiron oxide deposit with ore...disseminated ores and gabbro. Considering the entire intrusion, which is locally cut by dikes or veins of anorthosite...settling or in situ growth on the floor of the intrusion. However, rhythmic layering produced by in situ...crystallization only occurs in the middle of the Panzhihua intrusion and was caused by periodic fluctuation in water...water pressure. Keywords: Panzhihua layered intrusion; Emeishan Large Igneous Province; wehrlite; VāTiāiron |  | | 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...MLE omega 6. Southern boundary of the younger intrusion..................cccccccesseeeeeeecececeeseeeaees...occurrences of ultramafic rocks in the Duke Island area ............. 88 91 eee ASaINOrta Filtra malic...deena DS Grave Point Spinel peridOUteĀ® a. cee en chr area ewes eee ee ek a ae setae ics te eee oN Ne tame: |  | | Journal (article/letter/editorial) | | Skaergaard, Greenland, (TAYLORand EPSTEIN,1963) and Muskox, Canada, (TAYLOR, 1968) indicated that the isotopic...the opposit trend in the acid members of the Muskox intrusion were explained as a result of isotopic exchange...at Skaergaard (TAYLORand EPSTEIN, 1963) and at Muskox (TAYLOR, 1968) as far as the major rock types are...in the Skaergaard and enriched in it in the Muskox intrusion. When basaltic magma precipitates olivine...of meteoric (at Skaergaard) and of magmatic (at Muskox) origin. The present results indicate that under |  | | Journal (article/letter/editorial) | | Modally-Graded Rhythmic Layering in the Skaergaard Intrusion by MARK E. CONRAD* AND H. R. NASLUNDf Department...layers occur only in the Layered Series of the intrusion, in which they are a widespread, almost ubiquitous...regular manner within the layers studied. The forsterite composition of olivine is consistently higher...of all of the types of layering found in the intrusion. INTRODUCTION Layering is a common feature of...information about the manner in which a cooling intrusion crystallized. Accordingly, the origin of igneous |
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