 | | Journal (article/letter/editorial) | | here for constituent minerals from the Oka carbonatite complex, which is associated with the Cretaceous...contamination during the petrogenetic history of the Oka complex. Instead, the isotopic variations reported here... 1994). The Cretaceous Oka carbonatite complex within southern Québec (Canada) contains both carbonatite...reveal that the magmatic activity (maximum extent) at Oka was a prolonged event, which occurred between 109...both carbonatite and associated silicate rocks at Oka. Previous investigations report the major and trace |  | | Journal (article/letter/editorial) | | U–Pb ages of apatite from the Oka carbonatite complex: Insights into a complex crystallization history Wei...Keywords: Apatite Calcite Geochronology Carbonatite Oka Laser ablation a b s t r a c t This study reports...associated okaites and ijolites from the Oka carbonatite complex (Canada). Both apatite and calcite are rare...recorded in apatite inclusions within early-formed melanite, whereas apatite within matrix calcite is characterized...associated okaites and ijolites at the Oka carbonatite complex. The combined large variations in major |  | | Journal (article/letter/editorial) | | Multi-Stage Petrogenetic History of the Oka Carbonatite Complex (Québec, Canada) as Recorded by Perovskite and...2014 / Published: 26 May 2014 Abstract: The Oka complex is amongst the youngest carbonatite occurrences...the Monteregian Igneous Province (MIP; Québec, Canada). The complex consists of both carbonatite and undersaturated...study is to decipher the petrogenetic history of Oka via the compositional, isotopic and geochronological...overlaps the range of ages reported previously for Oka and the entire MIP. The overall distribution of ages |  | | Journal (article/letter/editorial) | | yttrium in the rocks and minerals of the Oka carbonatite complex, Quebec G. NELSON EBY Department of Environmental...(14) and mineral (87) samples from the Oka carbonatite complex. Whole-rock and mineral data indicate a...mineral pairs are quite variable, indicating that the Oka rocks were emplaced through a wide-range of physicochemical...conditions. A reasonable model for the origin of the complex involves a limited partial melting of mantle material...and Y in the various minerals of a carbonatite complex, REE and Y abundances were determined for rocks |  | | Journal (article/letter/editorial) | | district, California; Oka, Quebec, 1980) andmanyothersundoubtablyremainto be dis- Canada;Iron Hill, Powderhorn...HOH-bending vibration district,Colorado;O -- Oka Carbonatite,Quebec,Canada. mode,coupledwith the OH-stretchingmotion...ywere obtainedfrom publishedreports.Five of the Oka, Quebec,samples were analyzedindependentlyfor rare...Biotite, microcline,hornblende} augRe,rutlie Oka Complex,Quebec (Gold, 1969, p. 49-50; Gold andVallee...Calcite,Na pyroxene,biotite, Melanite melteigite Na pyroxene,melanite, nepheline,calcite, apatite Wollastonite |  | | Journal (article/letter/editorial) | | Earth Element Geochemistry of the Fen Alkaline Complex, Norway Roger H. Mitchell* and Arild O. Brunfelt...element (REE) abundances in rocks of the Fen complex has shown that within rocks of the first magmatic...ijolitic magma by crystallization of apatite, melanite, pyroxene and nepheline is reflected in the very...and volatile transport. Introduction The Fen complex ofcarbonatites and alkaline rocks intrudes Precambrian...119 km, south-west of Oslo. The geology of the complex has been described by Brogger (1921) and Saether |  | | Journal (article/letter/editorial) | | and syenite ring dike system, in the Gardiner complex, East Greenland T. F. D. NIELSEN LITHOS Nielsen...and syenite ring dike system, in the Gardiner complex, East Greenland. Lithos 13, 181-197. Oslo. ISSN...melteigite-ijolite-urtite/nepheline syenite suite, b) melanite-caltcite veins and sevite dikes and sheets and...and concluded that the melilitolites of the Oka Complex (Gold 1966) were formed by fractional crystaUization... Melilitolites occur in the Tertiary Gardiner complex, East Greenland, Frisch & Keusen 0977) where the |  | | Journal (article/letter/editorial) | | oxygen ~topic ~rn~~on of ~~~at~ the Oka Carbonatite complex, Quebec, Canada PETER from DEINES Department...awepted ira re~~sea~o~ 5 Jum 1970) Abstract-X%e Oka complex is a carbonatite belonging to the alkaline intrusive...oxygen isotopic composition of carbonates from this complex were studied and found to vary by 7 x0 for carbon...exist in cross sections through the carbonetite complex. INTRODUCTION A NUMBER of au&hors have published...fifty carbonatite rook samples from the Oka carbonatite complex were analyzed for the carbon and oxygen |  | | Journal (article/letter/editorial) | | Bulletin No. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq, East Greenland by Wolfgang...McLean. o. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq Bast Greenland. 1977 by W. Frisch...Bulletin No. 122 Gardiner intrusion, an ultramafic complex at Kangerdlugssuaq, East Greenland by Wolfgang... Abstract The Gardiner intrusion is an ultramafic complex in the inner region of Kangerdlugssuaq fjord, forming...sphene and magnetite. The melteigite with its complex mineral assemblage is the produet of a residual |  | | Journal (article/letter/editorial) | | nepheline,albite, wollastonite,olivine, phlogopite,melanite, melilite,chondrodite, sphene,cerite,fluorapatite...analyses(excluding0ka semples) II = III = " " "Oka carbena:erocks / a•ber of amalyses. ' carbonatltes...composition (column II) of the carbonaterocks from the Oka Complex near Montreal, Quebec (11). The values from these...carl)onatites wereobtained from rocksof the Alno Complex, andrepresent themoresiliceous carbonatite rocks...GEOTECHNICALSCIENCES, LOYOLA COLLEGE, MONTREAL, CANADA, •Ipri! 17, 1963 REFERENCES 1. Baertschi, P.. |  | | Journal (article/letter/editorial) | | and ultramafic xenoliths from Tie Bizard (Qu6bec, Canada) Luc Harnois, Raymond Mineau and Maurice Morency...Montrbal, P.O. Box 8888, Station A, Qua. H3C 3P8 (Canada) ( Received July 21, 1989; revised and accepted...and ultramafic xenoliths from lle Bizard (Qurbec, Canada). Chem. Geol., 85:135-145. The ile Bizard intrusion...that form a series of hills extending eastward from Oka (Fig. 1 ). The Ile Bizard intrusion is composed of...phlogopite, garnet, perovskite, nepheline, melilite and melanite (Mitchell, 1979, 1983; Raeside and Helmstaedt |  | | Journal (article/letter/editorial) | | Nooitgedacht, W. Transvaal Bond Zone, Oka complex, Canada Oka complex, Canada BD 1488 BD 1584 BD 1550 BD 1577...carbonatites from East Africa, South Africa and Canada, in order to constrain the longevity and origin...Sr isotopes, while the carbonatites from Oka complex (Canada) have slightly more radiogenic Nd compositions...from Spitzkop complex plots close to the range reported by Harmer (1999) for this complex. The two Proterozoic...carbonatites from this study. Fields for each complex encompass this and published data. Grey field outlines |  | | Journal (article/letter/editorial) | | have been compiled in Fig. 1. The data for the Oka carbonatite (DEINES, 1970a) were not included, since...the large number of analyses available for this complex would have completely dominated the distribution...calcite with accessory minerals) from the same complex (DEIXES, 1970%). However, the question arises whether...observed in Fig. 1. There is only one carbonatite (Oka) for which one can state the average carbon isotopic...that all three means differ from the mean of the Oka csrbonatite at the one per cent level of significance |  | | Report (issue) | | Sulphur Springs complex...................................... 7 V-intrusive complex................................................ 7 Magnet Cove complex..................................................- Generalized geologic map of the Magnet Cove complex.......... 8 Tables Table 1. - Analytical data...million years after the silicate rocks of the complex. Petrogenetic models for Magnet Cove should consider...from this study. The ages for the Prairie Creek complex are from Zartman and others (1967). The dashed |  | | Journal (article/letter/editorial) | | SETTING OF injected sub-volcanic complex. THE PLUTONIC IGNEOUS Complex zoning of phases and mineral disequilibrium...inclusion-rich zones indicating co-precipitation of melanite garnet (the dark phase) with the pyroxene; pyroxenes...is also cementing small grains of pyroxene and melanite. Scale-bar represents 1 mm; plane-polarized light...pyroxenes. [These two apparently simple trends conceal complex variation (see Figs 10—12, below).] There are other...denotes core composition, R denotes rim. "Fig. 8. Complex core-overgrowth relationships are revealed in thii |  | | Journal (article/letter/editorial) | | IN NEPHELINITIC ROCKSAND CARBONATITES, GARDINER COMPLEX, TERTIARY OF EAST GREENLAND T . F . D . N I E L...nephelinitic rocks and carbonatites, Gardiner Complex, Tertiary of east Greenland. Chem. Geol., 53: 207--217...207--217. The carbonatite-bearing Gardiner Complex in the Tertiary Magmatic Province of east Greenland...rare and confined to the marginal parts of the complex. The Sr 0 of the magmatic liquids are similar to...a n d syenitic m a g matism. The rocks of the complex, f r om cumulates to fine-grained dike rocks, cover |  | | Book | | Kresten Valentin R. Troll The Alnö Carbonatite Complex, Central Sweden GeoGuide Series editors Wolfgang...Wolfgang Eder, Germany Peter T. Bobrowsky, Canada Jesús Martínez-Frías, Spain Axel Vollbrecht, Germany The...Kresten Valentin R. Troll • The Alnö Carbonatite Complex, Central Sweden 123 Peter Kresten Section for...this respect, the late Proterozoic Alnö igneous complex in central Sweden is one of the most classical...research on the Alnö carbonatite and alkaline igneous complex since the very first descriptions by Högbom in 1895 |  | | Journal (article/letter/editorial) | | A1LL1KITES Aillikile Type rock Lamprophyre Ouachitue Oka Kunberlue Alvikttic alnoiie Alno Alnoiie Alkaline...More specifically, Dawson's (1971) term central complex kimberlite has been (rather indiscriminately) adopted...delineated major differences between 'central complex kimberlites' (UML) and archetypal (e.g. S. African)...(1979, 1983) assessment of the He Bizard 'central complex kimberlite' as a lamprophyre, reaffirming its mixed...and Clement et al. (1984), the terms 'central complex kimberlite', 'kimberlitic lamprophyre' and the |  | | Book (edition) | | elements (Mountain Pass, California) and of Nb (Oka, Quebec and Araxa, Brazil) and important sources...occurrences in the United States (nearly all localities), Canada, Germany, Norway, Sweden, Uganda, Tanganyika, Nyasaland...Description of Carbonatites of the World United States Canada Brazil Greenland, Europe, and the U.S.S.R. Africa...detailed geological survey of the Alné Island complex and announced his results in a series of papers...completed most of the field work on the Iron Hill complex of Gunnison County, Colorado, in 1912-1913. Although |  | | Journal (article/letter/editorial) | | and trace element measurements. The Ice River Complex is a late Paleozoic alkaline intrusion consisting... and located in southeastern British Columbia, Canada (Bowers & Rowan, 1996). It also contains an ijolite...reference perovskite with apatite (Ap) inclusion; (H) Oka reference perovskite with calcite (Ca) inclusions...clinopyroxene and subordinate apatite, ilmenite, melanite, and titanite (Heaman, 2009). The Ice River perovskite...perovskite (17–21 wt% Nb2O5) from the Oka carbonatite complex, Quebec, Canada (Cox & Wilton, 2006). Previous |  | | Journal (article/letter/editorial) | | Monteregian lamprophyres, QuCbec, Canada JEAN H. BBDARD Commission Geologique du Canada, Centre G6oseientifique...2700 Einstein, CP 7500, Ste-Foy, Q&bee GlV 4C7, Canada (Received June 9, 1992; accepted in revisedform...for Monteregian activity, although the Oka carbonatite complex appears to be slightly younger ( 109 -t...(GOLD et al., 1986) including the Oka carbonatite-ijolite complex, alntiitic dykes and diatremes, the...of the magmas fractionating within the central complex magma chambers (HODGSON, 1968), but will not be |  | | Book | | ............................ 4 NORTH AMERICA Canada..................................................exploration in particular of Africa, the U.S.S.R., Canada and Brazil, much of it inspired by the search for...Lengai natrocarbonatite volcano and the Ilimaussaq complex, but comparative studies on alkaline rocks have...style adopted for Currie's 'The Alkaline Rocks of Canada' (1976) and the descriptions of carbonatites compiled...pathoidal rocks of the Haliburton-Bancroft area of Canada. Kimberlites are not included, partly because they |  | | Journal (article/letter/editorial) | | Investigation of the Chilwa Island Carbonatite Complex, Malawi: Evidence for a Depleted Mantle Source... Carleton University, Ottawa, Ontario K1S 5B6, Canada (Received 28 September 1993; revised typescript... rocks from the early Jurassic, Chilwa Island complex, located in southern Malawi, central Africa, suggest...non-nephelinitic intrusive silicate rocks reveal a more complex evolutionary history, involving either selective...disseminations (Garson & Smith, 1958). Five per cent of the complex (Fig. 2) exposed at the surface consists of plugs |  | | | | spinel group minerals and sporadic wollastonite, melanite, titanite and sodalite. In addition, melilite...in a complex fashion. Simple intergrowths preserve the tabular habit of melilite, while complex intergrowths...mel2): (a) shortprismatic and tabular habit; (b) complex intergrowth giving a star-like appearance. Size...2002; Dunworth and Bell, 2003). In the Turiy Mys complex, a melilite rich in Na and Al occurs in an intrusive...is clearly alumoåkermanite. In the Odikhincha complex the melilite rich in Na and Al occurs in a phlogopite-melilite |  | | 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...of the Muskox intrusion, Northwest Territories, Canada By T. N. Irvine and C. H. Smrru A. B. C. Introduction...COMPLEXES By P. J. WyLuir The Duke Island ultramafic complex, southeastern Alaska By T. N. IRVINE Introduction |
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