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| information obtained by core sampling of the solid rock underlying the loose deposits on the floor of the...north-west of Cornwall and of nepheline phonolite from Epson Shoal, 6 miles east of the Wolf Rock. Other samples...in the northern part of the Celtic Sea (between Cornwall and Ireland), the loose late Tertiary and Quaternary...samples of older strata in the western waters, and the rock exposed in several submarine banks lying off the...the core obtained did not penetrate to the solid rock or no core was obtained at all, are GEOL. MAG. VOL |
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| A Note on the Nosean Phonolite of the Wolf Rock, Cornwall By C. E. TILLEY '""T'HE first systematic descriptions...descriptions of the nosean phonolite of the _L Wolf Rock were given by Allport (Geol. Mag., 1871, p. 247;...247; 1874, p. 462). Later a fuller account of the rock was provided by Teall in his British Petrography...Petrography (1888, pp. 367-368). Since that time the rock has been repeatedly figured in text-books of petrography...request carried out a new analysis of the fresh rock, the results of which are provided in Table 1 (No |
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| ENGLAl~D SW. England: coffinite, lxi Sykes, Bowland Forest High, Yorkshire: azurite, lxxxvi Cornwall Geevor...Derwentwater: pyro- N o r w a y (Norge) Laagendal: nepheline, 114 Sorfinnset, Glomfjord: chondrodite, humite...(PoccHg) Ilmen mountains: chevkinite, 42 Wolf Rock: nepheline, 114 868 Goldscope, Vale of Newlands:...Carnearney Hill; Cammoney Hill, Belfast; Castle Rock; Catcairn Hill, Legoniel, Belfast; Glenoe; Kilwanghter...borehole, Templepatriclc; Whitewell, Collinward; and Wolf Hill: gismondine and other zeolites (analcime, chabazite |
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| seem to throw an3-light on the Eocene geology of Cornwall, nor of any part of the area west of Dartmoor...unlike anything that I had expected to find in Cornwall, that I examined it closely, taking away samples...that scattered Chalk-flints were not uncommon in Cornwall, I could not understand why so many had collected...by Naturalists that we have no flints native in Cornwall, but this is a mistake. Betwixt the towns of Penzance...far f r o m a n y e x p o s u r e of Cretaceous rock, t h e y are s u b a n g u l a r ; a n d t h e y |
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| alkalis. Iron-rich nepheline from 01 Doinyo Lengai , as 4.6 percent iron. In nepheline with patchy extinction...nephelinesin a nepheline tephrite from Ol Dionyo Lengai in Tanzania; shand (1922) mentioned zoned nepheline from...the amount of CaAIzSizOsin solid solution in nepheline increased,curemained constant, but e increased...in ZONING IN NEPH]iLINES l'ig. 1. A, C) Nepheline crystals 1 and 2 respectively from 64-8-1K showing...proportional to the iron content of the nepheline nepheline, line traverses were made and beam-scanning |
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| chlorite); 7 organic minerals; 4 pseudomorphs; and 2 rock names. The details are incorporated in the individual...first discovered in the British Isles (14 from Cornwall; 2 from Somerset; 1 from Cheshire; 2 from Scotland;...H. G. M A C P H E R S O N from England (75 of which are from Cornwall); 28 from Ireland; and 10 from...Thus, of the 130 species, 64 are from England (48 from Cornwall); 35 from Scotland; 19 from Ireland; and...regional lists as, for example, for SW England, Pennines and northern England, Wales, Ireland, Scotland, etc |
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| presented in Table 1 and brief descriptions of the rock samples are given in the Appendix. Potassium and...(Ma) 1. Caldas de Monchique nepheline 4.42 feldspar 7.93 nepheline 4.58 biotite 7.54 feldspar...analyses of two biotites and one corresponding whole-rock from each of the complexes at Sintra, Sines and...Model ages range frt~m 56 to 85 Ma: the three whole-rock points and six biotite points fall near separate...meaningful information is by examining the ages of whole-rock mineral pairs from individual complexes and so these |
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| Manchester MI3 9PL, UK 2 Department of Geology, The University, Sheffield $1 3JD, UK Abstract. Mineral...increases. The most SiO2-rich nephelines plot in the nepheline plus feldspar stability field and must have crystallized...to rocks which crystallized primary SiO2-rich nepheline and formed from this phase by subsolidus recrystallization...(Ne60Kseo)-An-Qz; and An-Ab-Or. Mineral and bulk rock compositional data together with textural criteria...alteration of a SiO2-rich nepheline to clear analcime and concluded that the nepheline was a primary phase |
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| Africa N.M.S. Rock Department of Mineralogy and Petrology, University of Cambridge, England Abstract. Rb-Sr...Rb-Sr whole rock isochrons for the Monchique and Mt. Kenya complexes, together with a series of 87Sr/86Sr...between previous studies. A consideration of wall-rock reaction, responsible for a few anomalous ratios...participation in the origin of nephelinites, nepheline syenites, ijolites or peralkaline oversaturated...antipathy between alkaline rock complexes of "gabbroic" and "carbonatitic" type (Rock, 1976). "Gabbroic" complexes |
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| Atlas of rock-forming mineral! in thin section W.S.MacKenzie and C.Guilford Digitized by the Internet...http://archive.org/details/atlasofrockformiOOmack Atlas of rock-forming minerals in thin section W.S.MacKenzie...Limited Longman House Burnt Mill, Harlow, Essex, UK Associated companies, branches and representatives...Cataloging in Publication Data MacKenzie, WS Atlas of rock-forming minerals in thin section. Includes index...& 75 76 Nepheline Leucite 79 Nosean 80 Cancrinite 73 74 Cristobalite Nepheline 36 Titanaugite |
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| of subsidiary maxima of scattered intensity in nepheline. (With Plate III.) By J. l). C. -~IcCoNNELL,M...irrational and varies with the composition of the nepheline concerned. The presence of these maxima, which...nephelines studied, indicates that the structure of nepheline at low temperatures cannot adequately be described...inten1 Similar maxima in nepheline have been described by Sahama (1958) for a nepheline from Iivaara. NEPIIELINE...state must be considered. Natural nepheline specimens studied. The nepheline specimens studied in the present |
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| BOOK OF PETROLOGY CONTAINING A DESCRIPTION OF THE ROCK-FORMING MINERALS AND A SYNOPSIS OF THE CHIEF TYPES...THE IGNEOUS ROCKS SILICA GROUP FELSPAR GROUP . NEPHELINE - LEUCITE GROUP MICA GROUP AMPHIBOLE GROUP PYROXENE...materials of which the earth's crust is built up. A rock may be defined as a mineral aggregate, possessing...mode of aggregation of the constituent minerals, or rock-structure. In classifying rocks, we must allow...of the minerals since the first formation of the rock.1 The three rocks made use of in our example, may |
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| 462 S. Allport—On Phonolite from the " Wolf Hock." Ninth.—The deposition of the Boulder-clay and Moraine...present time. V.—NOTE ON THE PHONOLITE FROM THE " WOLF ROCK." By 8. ALLFORT, F.G.S. I N the GEOLOGICAL MAGAZINE...structure of a Phonolite which forms the mass of the Wolf ftock lying between the Land's End and the Scilly...description of some of the crystals stated to be nepheline, and suggests that they may be nosean. The passage...that there can be no doubt of its presence in the rock ; the mineralogical composition of which is thus |
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| whose silica activities are near or below the nepheline-albite equi librium. At lower temperatures its...silica activities, and will therefore precede nepheline in the crystallization sequence of phonolitic...greater than.fn,, villiaumite (NaF) or fluorite and nepheline will take the place of sodalite. AGoT for nosean...been estimated, and it similarly can precede nepheline in the crystallization order of phonolitic trachytes...Tner-r 1. Cnr,orrnnAnuNoaNcrsrN Soun lcNrous Rocxs Rock Description Average Igenous l{ocks Granite (Taylor |
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| in particular to Dr. W. R. Browne and Professor Rock." This appearsto have been Tilley's first exT. G...South Australia.Tilley first setfoot in Cambridge,England, on Thursday,5 February 1920. He was taken into...metamorphosedsediments,and tory). where any dark rock is a diorite." This work was Although Tilley was...the lake after a hot day examining the Wausau nepheline syenite of Wisconsin, emerged some distance from...always stimulated, relaxed, and happy. Back in England was the task of welding a new Department from the |
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| Endsleigh House 50 Daniell Road Truro, Cornwall TR1 2DA England Printed in Great Britain by Short Run...that he knew of no place on earth that surpassed Cornwall in the number and variety of its minerals. Hogg's...is subtitled 'in wich [sic] is shown how much Cornwall contributes to the illustration of the science'...later by Collins' A Handbook to the Mineralogy of Cornwall and Devon' (1871; 1892 with addenda, the latter...mention Purser's 'Minerals and locations in S.W. England' (1974). The work was never published, although |
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| materials of which the earth's crust is built A rock may be defined as a mineral aggregate, possessing...mode of aggregation of the constituent minerals, or rock- structure . In classifying rocks, we must allow...of the minerals since the first formation of the rock.¹ The three rocks made use of in our example, may...whether the interior of the earth is occupied by rock in the molten condition, or by solid material at...eruption the pressure is relieved and the liquid rock injected in the direction of least resistance. According |
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| THEORIES OF PETRO GENESIS , A DESCRIPTION OF THE ROCK-FORMING MINERALS , AND A SYNOPSIS OF THE CHIEF...separation of the part treating of the classification of rock types from that dealing with their dis tribution...ROCKS Chapter Page 67 I. CLASSIFICATION OF THE ROCK-FORMING MINERALS 73 73 II. APPEARANCE UNDER THE...Double Refraction 79 III . DESCRIPTION OF THE ROCK - FORMING MINERALS 81 The Silica Group The Felspar...Determination of Rock -form ing Minerals, translated from the German by F. H. Hatch . J. P. Iddings. Rock Minerals |
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| quartz, plagioclase, orthoclase, leucite, and nepheline. The crystallization temperature of each mineral...information from published silicate systems and rock melting experiments. The nine equations are solved...Augite Plagioclase Orthoclase Quartz Leucite Nepheline Abbreviation Mag Olv Hyp Aug Pla Ksp Qtz Leu...mineral, where the liquid composition equals the rock composition. At the present time such determinations...Hypersthene Augite Plagioclase Orthoclase Leu cite Nepheline // A MODEL OF MAGMATIC CRYSTALLIZATION 71 |
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| Peninsula, and its tectonic significance N. M. S. ROCK L1THOS Rock, N. M. S. 1982 04 15: The Late Cretaceous...Portugal; about 80 small basanitic/iamprophyric to nepheline syenitic intrusions scattered thJ ough the Pyrenees...specifically that of the Bay of Biscay. N. M. S. Rock, Institute oi' Geological Sciences, West Mains Road...world's larger masses of metaluminous (miaskitic) nepheline syenites. The purpose o:f this account, therefore...while Table 3 gives average rock compositions. Certain other alkaline rock occurrences in the Peninsula |
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| volcanic area of the Garlton Hills. Among these, the rock of Traprain Law especially attracted my attention...attention. It is a close-grained, dark brown to grey rock. Some varieties have a glistening or greasy surface...character of the rock became apparent, Microscopic examination shows that the rock is a trachytic phonolite...and thus adds another to the sparsely developed nepheline-rocks of the British Isles. As I intend to describe...description. The rock bears no resemblance to the well-known phonolite of the Wolf Rock, described by Mr |
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| district featured on Maton 's geological map of Cornwall in 1797 and accounts, both of the minerals and...youngest ig neous rock in the area is the early Cretaceous phonolite of Wolf Rock. Small outcrops of...Memoir for 1: 50 000 geological sheets 351 and 358 (England and Wales) LONDON: HER MAJESTY'S STATIONERY OFFICE...British Geological Survey, Sheets 351 and 358 (England and Wales). Authors A J J Goode, BSc and R T Taylor...preceded by E refer to specimens in the English slicecl rock ccJllection, British Geological Survey, Keywc>rth |
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| GENERAL 3 FOREWORD. textures nowadays require ROCK varying powers of the to be resolved under microscope...Chacewater, Cornwall Granite, Heidelberg Pegmatite, Thuringia Luxulyanite, Luxulyan, Cornwall 17 18 18...Nephelinite, Odenwald Leucitite, Capo di Bove The Wolf Rock Volcanic Tuff, Braid Hills Palagonite Tuff, Burntisland...Serpentine, Baste ; Nephelenite, Odenwald The Wolf Rock di Bove; Phonolite, Capo Volcanic Tuff, Braid...2nd Edition (Eightysix Illustrations and Text on Rock-Forming Minerals and Igneous Rocks). HUSSAK. Anleitungder |
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| volcanic area of the Garlton Hills. Among these, the rock of Traprain Law especially attracted my attention...attention. It is a close-grained, dark brown to grey rock. Some varieties have a glistening or greasy surface...character of the rock became apparent, Microscopic examination shows that the rock is a trachytic phonolite...and thus adds another to the sparsely developed nepheline-rocks of the British Isles. As I intend to describe...description. The rock bears no resemblance to the well-known phonolite of the Wolf Rock, described by Mr |
 | | Journal (article/letter/editorial) |
| 64, 372-6. 1927. On a custerite-bearing contact rock from Califor nia. Geol. Mag. 65, 371-2. 1928. On...Min. Mag. 24, 181-202. 1935. Eulysites and related rock types from Loch Duich, Ross-shire. Min. Mag. 24...syn texis. Am. J. Sci. Bowen Vol. 529-45. 1952. Nepheline parageneses. Mawson Anniv. Vol. Univ. 294 八...39-45. 1953. Nepheline-alkali feldspar paragenesis. Am. J. Sci. 252, 65-75. 1954. Nepheline associations...(Brouwer Vol.) 403-13. 1956. Problems of alkali rock genesis. Quart. J. Geol. Soc. Lond. 113, 323-60 |
