 | | Journal (article/letter/editorial) | | M assachusetts Cambri.d Ab6tract Low-temperature(down to 4.2 K) 57FeMiissbauerspectrahave been taken of...pattern consistentwith that of "normal" ferrous fayalite. The peaksdue to ferric iron split independentlyto...vacancies. Introduction "Ferrifayalite", a variety of fayalite containing from about ten to forty weight percent...1976,1982).prior to that time, two discoveriesof fayalite containing ferric iron had been made in the Soviet...the term "ferrifayalite" refersin generalto any fayalite containing severalpercentor more ferric iron, |  | | Journal (article/letter/editorial) | | Some aspects of Tertiary acid magmatism in NE Ireland I. G. MEIGHAN, D. GIBSON, AND D. N. HOOD~ Department...Queen's University of Belfast, Belfast, BT7 1NN, Northern Ireland ABSTRACT. Geochemical data (including R E...are presented for all five Mourne Mountains granites and three Northern Ireland rhyolites. These confirm...(2) a major revision to the outcrops of the E. Mourne granites G1 and G2 in which much of the former...in the emplacement of Mourne intrusions G2 (Revised)-G5 inclusive. The N. Ireland Tertiary acid rocks exhibit |  | Macdonald, R., Baginski, B., Dzierzanowski, P., Fettes, D. J., Upton, B. G. J. (2013) CHEVKINITE-GROUP MINERALS IN UK PALAEOGENE GRANITES: UNDERESTIMATED REE-BEARING ACCESSORY PHASES. The Canadian Mineralogist, 51 (2) 333-347 doi:10.3749/canmin.51.2.333 | Journal (article/letter/editorial) | | 3749/canmin.51.2.333 CHEVKINITE-GROUP MINERALS IN UK PALAEOGENE GRANITES: UNDERESTIMATED REE-BEARING ACCESSORY...Murchison House, West Mains Road, Edinburgh EH9 3LA, UK Brian G.J. UPTON School of Geosciences, Grant Institute...Institute, University of Edinburgh, Edinburgh EH9 3JW, UK Abstract Chevkinite-group minerals were sought in...Scotland and Northern Ireland, ranging from biotite ± amphibole granites through fayalite-ferrohedenbergite...compositions. Keywords: chevkinite-group minerals, UK Palaeogene granites, zoning patterns, textural analysis |  | | Report (chapter) | | timing of Tertiary central complex magmatism in NE Ireland I. G. Meighan, A. G. McCormick, D. Gibson, J. A...regressions are presented for each of the Mourne Mountains granites (G 1-G5 inclusive) and a set of ...initial Sr isotope ratios are > 0.7060 for all five Mourne granites, the Slieve Gullion granophyres/microgranites...involvement is indicated in their petrogenesis. In the E Mourne Centre the first (the least silicic and most Sr-rich)...comprehensive suite of Tertiary rhyolites from NE Ireland, some separated by > 50 km, define a linear array |  | | Journal (article/letter/editorial) | | five samplesof fayalite previously studied by Mdssbauer spectroscopy.Rockport fayalite is homogeneous...suggesting either a post-crystallization reaction with fayalite and oxygen going to laihunite and hematite or...texture of olivine from the Mourne Mountains suggestsexsolution from a fayalite-laihunite solid solution...images, but these areas cannot correspond to pure fayalite and laihunite exsolution becausethe bulk Fe3./EFeof...workers believed that ferrifayalite was a mixture of fayalite, hematite, and olivine from mantle kimberlite |  | McDonnell, S., Troll, V. R., Emeleus, C. H., Meighan, I. G., Brock, D., Gould, R. J. (2004) Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic sub-caldera magma chambers. Mineralogical Magazine, 68 (5) 725-738 doi:10.1180/0026461046850215 | Journal (article/letter/editorial) | | Intrusive history of the Slieve Gullion ring dyke, Ireland: implications for the internal structure of silicic...College, Dublin 2, Ireland Department of Earth Sciences, University of Durham, DH1 3LE, UK Institute of Lifelong...Learning, Queen’s University Belfast, Belfast BT7 1NN, UK ABSTR ACT The Palaeogene Slieve Gullion Igneous...1961), who recognized them in both Britain and Ireland. Many ring dykes and sheet intrusions display compositional...is located west of the Mourne Mountains in south County Armagh, Northern Ireland, the southern portion |  | | Journal (article/letter/editorial) | | ratios in the evolution of the Younger Granites of Northern Nigeria J. R’. BUTLER, Pure Geochemistry P...irregularly. IKTRODUCTIOX THE Younger Granites of Northern Nigeria, recently mapped and described by consist...dyke and may be In the centre and the south of Northern followed by later riebeckite-granite. Nigeria...some rocks from the Younger Granite complexes, Northern Nigeria. The symbols enclosed in brackets refer...Co. Armagh, Ireland, and t,wo granites from ‘VC’est Mourne Mountains, Co. Down, Ireland. All but nine |  | | Journal (article/letter/editorial) | | online April 2013 Apatite-supergroup minerals in UK Palaeogene granites: composition and relationship...Centre, Lancaster University, Lancaster LA1 4YQ, UK *Corresponding author, e-mail: r.macdonald@lancaster...Scotland and Northern Ireland range mineralogically from biotite amphibole – through fayalite-hedenbergite–...As part of an ongoing study of accessory phases in UK Palaeogene granites (Macdonald et al., 2013), we...set of occurrences in metaluminous granites. 3. UK Palaeogene granites A major hot spot developed in |  | | Journal (article/letter/editorial) | | STRUCTURAL RELATIONS of the IY[OURNE GRANITES (NORTHERN IRELAND). By JAMES ERNEST RICHET, ]~[.C., B.A.I.,...INTRODUCTION. THE Mourne Mountains rise abruptly from sea-level south of Newcastle, Co. Down, on a front of...index-map of the chief Tertiary intrusion-centres in Ireland and Scotland.] centrally disposed peaks of Eagle...another. In 1835, Griffiths's geological map of Ireland on a scale of four inches to the mile was completed...subsequent editions up to 1855, the boundary of the Mourne granite-massif is accurately traced, as well as |  | | Journal (article/letter/editorial) | | similar to other Tertiary granites of Scotland and Ireland, in age, setting, possible high-temperature mineralogy...the Mourne Mountains. Further similarities between the Lundy, North Arran, and Mourne Mountains granites... The latter underlies G1 in the cliffs of the northern part of the island and at some localities in the...centres such as Lundy, North Arran and the Mourne Mountains, granite predominates at the present exposure...and possibly on the northeast margin of the Mourne Mountains (Emeleus, 1982), although most of the latter |  | | Journal (article/letter/editorial) | | PERTHITES FRON{ THE SLIEVE GULLION AREA, NORT'HERN IRELAND* C. H. EnrnrBvs, Deparlment of Geology,Durham Collegesin...and granophyre ring dykes of Slieve Gullion, N. Ireland, have been made to elucidate the genesis of the...coverageto include larger masses, the Arran and Mourne granites (both about 7 miles in diameter) were...it developsas a mantle about clinopyroxene and fayalite phenocrysts.Occasionallythe groundmasscons;sts...is also textural evidencefor the replacementof fayalite and clinopyroxeneby amphibole ior the amphibole |  | | Journal (article/letter/editorial) | | of the basalts. The mass cannot have been faulted down. It is not a dyke. The presence of a base makes...olivine closely approaching fayalite in composition. The maximum content of fayalite given by a pitehstone...Inclusions of magnetite and zircon are common. The fayalite has been preserved unaltered in the glassy rocks...scattered throughout the roeks. The aggregation of the fayalite, diopside, and felsparl)henocrysts, and the concentration...1)vroxene shows no tendency to form around tile fayalite, which i's devoid of any reaction-border. The |  | | Journal (article/letter/editorial) | | Feldspar+biotite ^=? feldspar+fayalite+leucite+vapor. Feldspar+biotite % feldspar+fayalite+liquid+vapor. Biotite...Biotite % feldspar+fayalite+nepheline+vapor. (1) (2) (3) (4) On the QFM buffer (PTotia = 2 Kb), reaction...reaction Feldspars)+biotite+quartz % feldspars)+fayalite+vapor (5) is stable at higher hydrogen fugacities...consisted of biotite, sodium amphibole, nepheline, fayalite, magnetite, and TABLE 1 Iron biotite synthesis...University of Waterloo on December 15, 2013 Fayalite Fayalite was prepared hydrothermally from a stoichiometric |  | | Journal (article/letter/editorial) | | lying between the head of Loch Ainort and the northern end of the Blaven Range in central Skye forms...included in the area. The granites are mainly fayalite-hedenbergite types with a variety of phenocrysts...including part of the Western Eedhills and the northern end of the Blaven Eange. Maps covering the area...with Harker's laccolithic model and that at the northern end of the Blaven Eange the formation of vent...to chlorite and uralite is more common in this northern part of the basalt outcrop, as noted by Almond |  | | Journal (article/letter/editorial) | | see how Geikie mistook the basic sill complex of northern Skye for lavas contemporaneous with the enclosing...mapping of a British Tertiary igneous complex and laid down many of the guidelines and principles that later...Remains of these are seen near Kilchrist, on the northern slopes of Belig and around Loch na Creitheach...up a plateau sequence preserved principally in northern Skye. Although pyroclastic rocks are virtually...mafic lavas in the Bruach na Frithe area in the northern Cuillins. Harker considered this group to be the |  | | Book | | LOCALITIES IN THE United Kingdom of Great Britain and Ireland. BY K TOWNSHEND M. HALL, F.G.S. LONDON : EDWARD...of some of the principal localities in the same county, was given by Messrs . Greg and Lettsom in their...locality by some independent authority, such as maps, county directories, local guide books, &c. The geological...Manual of the Mineralogy of Great Britain and Ireland, by ROBERT P. GREG, F.G.S., and WILLIAM G. LETTSOM...of Mineral Substances hitherto dis covered in Ireland, by Sir CHARLES L. GIESECKE, F.G.S. 1832. A Catalogue |  | | Book | | MANUAL w OF THE MINERALOGY OF GREAT BRITAIN AND IRELAND. BY ROBERT PHILIPS GREG, F.G.S. , AND WILLIAM...work to place the Mineralogy of Great Britain and Ireland on that footing to which scientifically and economically...combination ( as M Playok, in topaz from the Mourne Mountains, Ireland ), almost every known British form being...Portlock's Geological Report and Survey of the N.E. of Ireland ( 1843 ). Catalogue of the British Museum . Sale...Beudantite. 135. Melanterite . 136. Iron alum . 137. Fayalite. ORDER III. Platinum . Genus 1. NATIVE PLATINUM |  | | Journal (article/letter/editorial) | | The granophyre specimen (DU 9904) comes from the northern part of the large granitic intrusion in SW Rhum...and fayalite from dacite, Asio, Japan, (Kuno, 1969); pyroxene s],'rnbolsas on Fig. 1; l, fayalite. generally...Petrology 4, 175-197 . Bnowx, P. E. (1956) The Mourne Mountains granites-a further study. Geol. Mag 93, 72-84...Mag. 17,97-99. Hucrrs, C. J (1960) The Southern Mountains igneous complex, IsIe of Rhulr'. Quart. J. Geol |  | | Journal (article/letter/editorial) | | their southern developments in Arran and the Mourne Mountains, were carefully described by Zirkel in 1871...During and after the fusion, new minerals (pyrites, fayalite, etc.) have been formed, and the whole rock h...and on the similar rocks of Silver Cliff, Custer County, Colorado. The former gentleman has greatly facilitated...There are, moreover, grounds for believing that fayalite, the ironolivine, was a constituent of the spherulites...cleavage of partially altered fayalite, like that of the Mourne Mountains. In spite of the minute size |  | | Book (edition) | | showing the cooling curves for the forsterite-fayalite series. (After Bowen and Schairer) 5. Diagram...Colwnnar basalt, Giant's Causeway, Co. Antrim, Ireland 59. Sketch-map of the South-West Highlands, showing...obsidian 90. Pitchstone, Corriegills, Arran 91. Fayalite-pitchstone, Glen Shurig, Arran 92. Spherulitic... Diagrammatic map of the Donegal Granite, Northern Ireland. Based on the work of Akaard, Pitcher, Read...Quartz-monzonite (Banatite), above Pechadoire, Northern Auvergne Olivine-gabbro with ophitic texture, |  | | Catalog/List | | wh ite crusts on matrix. Rawhide Mine, Moh ave County, ½ x ½ Arizona, U.S.A £3 Kragero Norway l x2 50p...masses in qu artz, under Flux Canyon.Santa Cruz County, ½ x ½ magn ificati on there are small crystals...mixture with Chrysotile. pale grey-green mass ive. County Bri dge Quarry,Lizard ,Cornwall Jx I £ I I x2...mm long in matrix with Pyrrhotite Ghana Hingston Down Rich silvery masses with Chalcopyrite Quarry,Cornwall...Apple green coatings on granite.Quite well Hingston Down Mine,Hingston ,Cornwall covered Saga Quarry, Tvedalen |  | | Catalog/List | | Relatively rich blue areas on quartz (Manganoan Fayalite) Rich resinous brown mass . ½ x I £4 Ixl £7 lx2...NaCaCeFeMnYZr lxl£2.50 lx2£5 2x2£10 Amphibole 957 FAYALITE Vester Silfberg,Ludvika. Sweden 264 MAGNESITE...Feldspar lxl £3 lx2 £5 small 2x2 £9 502 ANTIGORITE County Bridge Quany,Lizard ,Cornwall 172 BEEKITE Tor Bay...BORNITEGeevor Mine Cornwall 531 ARSENOPYRITE Hingston Down Quany,Cornwall,England CHALCOPYRITE- CHALCOCITE...Mg C0/3 128 DUNDASITE . Tynagh Mine, Loughrea, County Galway,lreland White micro fibres or crusts with |  | | Book (edition) | | of, the tetrahedrons as shown in Fig. 2. FIG. fayalite, represented by Fe2 SiO4 . These two orthosilicates...pure f orsterite is represented by Fo and pure fayalite by Fa, the symbol Fo52 Fa48 gives full information...proportions of the end-members, forsterite and fayalite, this must not be taken to mean that separate...1890° C for pure forsterite to 1205° for pure fayalite (Fig. 4). The diagram shows that for an olivine... Hyalosiderite Hortonolite Ferro hortonol ite Fayalite Hortonoli t:e Chrysolite Chrysolite FIG. 4 | | | Book (edition) | | front of, the tetrahedrons as shown in Fig. 2. fayalite, represented by Fe2Si04. These two orthosilicates...pure forsterite is represented by Fo and pure fayalite by Fa, the symbol Fo52 Fa48 gives full information...proportions of the end-members, forsterite and fayalite, this must not be taken to mean that separate...1890° C for pure forsterite to 1205° for pure fayalite (Fig. 4). The diagram shows that for an olivine...Chrysolite FIG. Fayalite 4 Diagram showing the cooling curve for the forsterite-fayalite series. The subdivisions |  | | Book | | melts (i). As a melt of a given substance cools down from its melting point, the number of centres of...found with magnetite and fayalite at the eutectic composition in magnetite-fayalite slags. That a particular...texture is observed in magnetite-fayalite slags when the magnetite and fayalite are crystallising together... the purely mineralogical classification breaks down and the chemical composition of the given volcanic...granitic rocks very low in magnesia have some fayalite. Among the accessory constituents, apatite in |
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