 | | Journal (article/letter/editorial) | | age of the Lugar sill and a discussion of the Late-Carboniferous/Early- Permian siII complex of S.W.... Scotland C.M.B. Henderson Department of Geology, The University, Manchester M I 3 9PL, U.K. K.A. Foland...Foland Department of Mineralogy and Geology, Ohio State University, Columbus, Ohio 43210, U.S.A. and...and F.G.F. Gibb Department of Geology, The University, Sheffield Sl 3JD, U.K. The incremental heating...theralite-picrite unit of the Lugar sill. Ar-release spectra show discordance mainly due to the presence of excess Ar |  | | Journal (article/letter/editorial) | | Gibb z 1 Department of Geology, The University, Manchester MI3 9PL, UK 2 Department of Geology, The University...$1 3JD, UK Abstract. Mineral compositional relationships have been studied in a variety of alkaline...forming the matrix of some of the rocks which seem to have formed under conditions of almost perfect fractional...fractional crystallization. The compositions of nephelines from the various rocks define an overall evolutionary...increases. The most SiO2-rich nephelines plot in the nepheline plus feldspar stability field and must have crystallized |  | | Journal (article/letter/editorial) | | 3 4 - 7 Formation of analcime in the Dippin sill, Isle of Arran T H E Dippin sill is a Tertiary differentiated...the SE. part of the Isle of Arran, Scotland. The sill is composed of different varieties of analcime olivine...occasionally associated with small (< o.I mm) nepheline grains, which are comparatively SiO2-rich (e.g...cracks in plagioclase and as a major constituent of large patches, up to I cm across, in which it may...radiating aggregates of other zeolites. Rocks from the chilled margins of the sill are characteristically |  | | Journal (article/letter/editorial) | | 0. W. TyrrellāPetrology of Arran. 305 V I . ā T H E PETROLOGY OF ARRAN. By G. W. TYRRELL, A . E . C...Professor of Geology, University of Glasgow. 1. THE RlEBECKITE-ORTHOPHYRE OP THE HOLY ISLE. F o u r...r OCCUX- rences of acid and sub-acid igneous rocks containing the rare soda-amphibole riebeckite have...in Great Britain, of which that of Ailsa Craig is the best known. The occurrences of Ailsa Craig1 and...contain ragged moss-like areas of riebeckite, together with microphenocrysts of quartz and alkalifelspar, |  | | Book (chapter) | | Province C. H. Emeleus Reader in Geology, University of Durham and M. C. Gyopari Senior Hydrogeologist,...ā¢ Tokyo ā¢ Melbourne ā¢ Madras Chap ter 6 Isle of Arran Introduction INTRODUCTION outermost parts...within the first, are present (see Arran has long been known as an area of complex Harker in Gunn, 1903; Tyrrell...Granite. beauty (Fig 6.1). It is the most accessible of the Their significance to the British Tertiary Volcanic...in the geology of Arran goes back over Complex and, additionally, that emplacement of more than 200 years |  | | Journal (article/letter/editorial) | | contamination of the Dippin sill, Isle of Arran, Western Scotland A. P. DICKIN* Department of Geology and...Mineralogy, University of Oxford, Oxford OX1 3PR C. M. B. HENDERSON Department of Geology, The University...Department of Geology, University of Sheffield, Sheffield $1 3JD ABSTRACT. The Dippin sill, which is...is emplaced into the Triassic sediments of SE Arran, is an alkaline basic sheet which displays pronounced...pronounced hydrothermal alteration. The 40-m-thick sill has suffered pervasive contamination with radiogenic |  | | Book (chapter) | | Province C. H. Emeleus Reader in Geology, University of Durham and M. C. Gyopari Senior Hydrogeologist,... References Agrell, S.O. (1965) Polythermal metamorphism of limestones at Kilchoan, Ardnamurchan. Mineralogical...structure and petrology of the Tertiary volcanic rocks of Eigg. Muck and Canna, N.W. Scotland. Unpublished M.Sc...University of Durham. Allwright, A.E. and Hudson, J.D. (1982) The Sgurr of Eigg. Journal of the Geological...Society of London, 139, p. 215 (abstract). Almond, D.C. ( 1960) The Tertiary igneous geology of Strathaird |  | | Journal (article/letter/editorial) | | an enstatitc achondrite EXTRATERRESTRIAL examples of the amphibole richterite [Na2CaMgsSisO22(OH,F)2 ]...and Plant, 1968). This paper reports an occurrence of richterite in an enstatite achondrite. On 3 August...in the Adamawa district of Nigeria, and was quickly recovered. An examination of the mineralogy and chemistry...fusion crust. On the surface, and throughout the body of the stone, are numerous irregular vugs up to 1 cm...in diameter in which richterite occurs as bundles of radiating fibrous needles up to 3 mm long. The vugs |  | | Report (edition) | | ASSOC! \1101\J GUIDE No. 32 ISLE OF ARRAN A field guide for students of geology by W. S. McKERROW and...exists to fo. ter the progess and diffusion of the science of Geology. It holds lecture meetings in London...Piccadilly. London WI V 9AG. All rights reserved. No pan of this publication may be reproduced. stored in a retrieval...permission in writing of Lbe author and the GeologistsĀ· Association. oles. The details of routes given in...in tJ1is guide do not imply a right of' way. The onus f obtaining pen11ission to use footpatJ,s and to |  | | Journal (article/letter/editorial) | | Foland Ć” F. G. F. Gibb Ć” C. M. B. Henderson Patterns of Nd and Sr isotopic ratios produced by magmatic and...post-magmatic processes in the Shiant Isles Main Sill, Scotland Received: 20 December 1999 / Accepted: 5 May...Shiant Isles Main Sill of the British Tertiary Igneous Province is a classic example of a diĀerentiated...diĀerentiated, alkaline basic sill. Four separate intrusions, each emplaced internally in rapid succession, form a...a 165-m-thick sill hosted by Lower Jurassic sedimentary rocks. Extensive Nd and Sr isotopic studies were |  | | Journal (article/letter/editorial) | | ALPHABETICAL INDEX Names of authors are printed in SMALLCAPITALS,subjects in lower-case roman, and...titanian, in teschenite sill, 529 Aenigmatites, Greenland, 9 Aikinite, Scotland, 88 ALLEN, D., polishing...see UPTON, B. G. J., 323 BELL, B. R., geochemistry of Lower Tertiary basic dykes, 365 BENDELOW, V. C.,... D. C., zaherite, 131 BIGGAR, G. M., composition of diopside solid solutions, 481 Biotite, Greenland...M. B., and GIBe, F. G. F., Sr contamination of Dippin sill, 311 Diopside solid solutions, composition |  | | Journal (article/letter/editorial) | | Crinanite By J. F. G. WILKINSON ABSTRACT Various aspects of the terms teschenite and crinanite are discussed...that the use of the term crinanite be discontinued. INTRODUCTION D URING the investigation of a differentiated...differentiated teschenite sill near Gunnedah, New South Wales, a study of the literature revealed considerable...considerable variation in the meaning and significance of the terms teschenite and crinanite. " . . . there is...resulting from continued petrographic usage of the terms, the proposal of actual basic magma types characterized |  | | Journal (article/letter/editorial) | | part 2~ THE PETROGRAPHY OF THE ā¢ ISLANDS. 317 101 The PEamO~R~.P]~Y of the AUSTRAL or TUBISXI ISLA...INTRODUCTION. THE following account of the petrography of the islands of Rapa and Rurutu in the Austral Group...Group is based on the collections made by one of us in April and May 1925 during the St. George Expedition...general account of the geology of t h e s e islands has already been given by one of us (Chubb, 1927)...Taga and the head of the harbour, though collections were made from many other parts of the island. I n |  | | Journal (article/letter/editorial) | | analcime: The Colima minettes Jlnrns F. Lurrn Department of Earth and Planetary Sciences,Washington University...S.A. T. Kunrrs Kvsnn Department of Geological Sciences,University of Saskatchewan,Saskatoon,SaskatchewanS7N...analcimehas X.,.,",: 0.684, ao: 13.712A, and one of the lowest D'sOvalues yet recorded for analcime (+9...it from analcime formed by ion-exchangeconversion of leucite (L-type analcime) or other precursor minerals...although the higher KrO and Rb contents and D'8Ovalues of L-type crystals may be diagnostic. P- and L-type |  | | Journal (article/letter/editorial) | | 45045 Orleans Cedex, France. 1 Department of Geology, University of Manchester, Manchester, Ml3 9PL, England...several modes in a variety of igneous rocks. Whether any of these modes of occurrence can possibly be...as judged from experimental data, is the subject of this paper. By primary igneous we mean precipitated...phases by hydrothermal action. Two possible examples of primary igneous analcite are first, the large idiomorphic...crystals {e.g. Plate 1) found in the blairmorite group of rocks (Dixey & Smith, 1929; Pearce, 1970); and, secondly |  | | Journal (article/letter/editorial) | | Abstract The paper presents electron microprobe analyses of nephelines and analcimes in alkaline igneous rocks...(quartz) components exceed those defining the limits of excess SiO2 in solid solution in the Ne-Ks-Qz-H20...New Zealand tinguaite vary significantly in Ne (nepheline), Ks (kalsilite) and Qz, even within individual...samples, and they also may be strongly zoned. The rims of zoned nephelines are enriched in Si and Fe 3+, relative...contrast with the composional trend of successive "bulk" nepheline fractions in the Square Top sequence |  | | Journal (article/letter/editorial) | | Springer-Verlag 1984 Petrology and geochemistry of differentiated teschenite intrusions from the Hunter...Australia J.A. Gamble Department of Geology, Victoria University of Wellington, Private Bag, Wellington...In the upper Hunter Valley of New South Wales a high level teschenitic sill complex emplaced into Permian...products of alkali basaltic melts. The sills crystallised in situ and produced a spectrum of rock types...a progressive decrease in olivine and a build-up of alkaline mesostasis which is accompanied by strong |  | | Journal (article/letter/editorial) | | pressure: equilibrium leucite composition and the enigma of primary analcime in blairmorites revisited C. M....P. WATERS1 School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Williamson...Williamson Building, Oxford Road, Manchester M13 9PL, UK Accelerator Science and Technology Centre (ASTeC)...Science and Innovation Campus, Warrington, WA4 4AD, UK [Received 28 May 2013; Accepted 14 January 2014;...SiO2(Qz) H2O at 100 MPa show that the maximum content of NaAlSi2O6 in leucite is ~4 wt.% and that analcime |  | | Journal (article/letter/editorial) | | School of Earth, Atmospheric and Environmental Sciences (SEAES), Williamson Building, University of Manchester...Manchester M13 9PL, UK Accelerator Science and Technology Centre (ASTeC), Daresbury Laboratory, Science...Technology Facilities Council, Warrington WA4 4AD, UK [Received 14 December 2011; Accepted 23 March 2012;...and substitution mechanisms discussed. Phenocrysts of biotite and augite in the minettes are also characterized...magnesium-rich, which is consistent with the primitive natures of the least evolved rocks. Bulk-rock major-element |  | | Journal (article/letter/editorial) | | analcime problem and its impact on the geochemistry of ultrapotassic rocks from Serbia D. PRELEVICĢ1,*,...2 3 AND R. L. ROMER3 Faculty of Mining and Geology, University of Belgrade, ,usĢina 7, 11000 Belgrade...Belgrade, Yugoslavia Institute of Geological Sciences, University of Mainz, Becherweg 21, 55099 Mainz, Germany...rocks from Serbia occasionally display low levels of K2O and K2O/ Na2O. In these rocks, analcime regularly...pre-existing leucite microphenocrysts. The process of leucite transformation in Serbian ultrapotassic rocks |  | | Journal (article/letter/editorial) | | Isles Main Sill" structure and mineral fractionation trends F. G. F. GIBB Department of Earth Sciences...University of Sheffield, Brookhill, Sheffield $3 7HF, UK AND C. M. B. HENDERSON Department of Earth Sciences...M13 9PL, UK Abstract The Shiant Isles Main Sill, of Tertiary age, is a classic example of a composite...composite, differentiated alkaline basic sill. The first unit to be intruded was a 2 m thick olivine teschenite...teschenite which was emplaced with phenocrysts of olivine (rag > 83) [rag = Mg#] and, perhaps, plagioclase |  | | Report (edition) | | Regional Geology The Palaeogene volcanic districts of Scotland FOURTH EDITION CH Emeleus BR Bell Contributor:...regional geology: the Palaeogene volcanic districts of Scotland (Fourth edition). (British Geological Survey...Printed in the UK b>f Hawthornes, Nottingham C/0 7105 Authors CH Emeleus Department of Earth Sciences...University of Durham, Science Laboratories, South Road, Durham DH I 3LE BR Bell Division of Earth Sciences...Sciences, University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow G 12 BQQ Contributor D Stephenson |  | | Report (issue) | | -Ā· . ., .:. ...:. Geology of Arran. (ll1e1n. Geol. ,.';urv.) VĀ£ew of ' 1000-Foot Platform ' a11oi1... DEPARTMENT OF SCIENTIFIC 4ļæ½ND INDUSTRIAL RESEARCH Memoirs of the Geological Survey, Scotland 17ze By...Geology in the University of Glasgow --- EDINBURGH PRINTED UNDER THE AUTHORITY OF HIS l\'.IAJESTY'S STATIONERY...Ā·ice 6s. 6d. Net PREFACE THE six-inch survey of Arran was begun in 1872 by Sir A. Geikie, who mapped...under the supervision of Dr. B. N. Peach, completed the detailed examination of the island. To Mr. Gunn's |  | | Journal (article/letter/editorial) | | and microtexture of analcime from two parageneses CrnrsrrNl M. B. LrNn Department of Earth Sciences,University...University of Cambridge, Downing Street,Cambridge CB2 3EQ, U.K. and Institut Laue-Langevin,Avenue des...Purr.ns, Crrmsrrxr Ptrrnns Department of Earth Sciences,University of Cambridge, Downing Street,Cambridge...00154Rome,Italy ABsrRAcr The dehydration behavior of an analcime formed by ion exchangefrom leucite (X-type...secondaryanalcime) is contrastedwith the behavior of an analcime formed by hydrothermal recrystallization |  | | Journal (article/letter/editorial) | | On the occurrence of an lcime in the northeastern Azerbaijan volcanics (northwestern Iran) P. COMIN-CHIARAMONTI... Mosca, R. & Sin~-,oi,S. 1979: On the occurrence of analcime in the northeastern Azerbaija~a volcanics...ISSH {A}24-4937. Euhedral, phenocryst-like crystals of anslcime, as well as microlites, are rather common...anaicitic dikes and lenses of the Upper Cretaceous and Lower Tertia~ volcanics of eastern Azerbaijan (Iran)...petrology of these extrusive rocks are described with the aim of establishing the orig/n of the big analcime |
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