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| MINERALS PEAK of rhe DISTRICT A joint publication of Rockbottom Publications and the Peak District Mines...1993) of the UKJournalof Mines&Mineralsand vol. 12 no. 1 of the Bulletin of the Peak District Mines Historical...COVER:BLUE JOHN FLUORITE, Blue John Mine, Castleton, Derbyshire, polished slab 7 x I 0cm. Bob King Collection...Mick Cooper. 2 THE PEAK DI TRI T MI E HISTORIC L SOCIETY 3-----------BL The UK Jouma/ of 1Jfi11es...advertising. EJOHN 4-----------ORIGI of the PEAK DISTRICT DC Quirk ORE FIELD EDITOR Mick Cooper EDITORIAL |
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| DER by Peter R. Rodgers Derbyshire Geology £1.50 By the same author: YORKSHIRE MINERALS Of...CAVES OF DERBYSHIRE DERBYSHIRE: EARLY A Visitor’s Guide SETTLEMENT GEOLOGICAL LAKELAND IN DERBYSHIRE...GEOLOGY IN LAKELAND Derbyshire Geology by Peter R. Rodgers Dalesman 1977 Books / The Dalesman...Yorkshire. 1977 0 85206 377 6 To Lucy _ Printed in Great Britain by Galava Printing Company Ltd., Hallam... Nelson, Lancs. Contents Geological Map of Derbyshire sk, este 6 ECE, 2s yh 8 Gere) Mer aise |
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| (1978) 9 by Springer-Verlag 1978 Petrology of the Uppermost Upper Mantle Deduced From Spinel-Lherzolite...Spinel-Lherzolite and Harzburgite Nodules at Calton Hill, Derbyshire Colin H. Donaldson Department of Geology, University...lherzolites and harzburgites from the Lower Carboniferous ankaramite vent at Calton Hill has been investigated for...composition and for variation in calculated bulk composition. The results indicate that the nodules are accidental...and at 950 ~ C, i.e. within the mantle but above the Low Velocity Zone. The lherzolites and harzburgites |
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| THE GEOLOGICAL MAGAZINE. NEW SERIES. DECADE V. VOL. VII. No. I. —JANUARY, 1910. AETICLBS. I . —...— O N OLIVINE NODTJI.ES IN THE BASALT OP CALTON HILL, DERBYSHIRE. By H. H. AKNOLD-BEMROSE, J.P., Sc.D...record the occurrence of J_ olivine nodules in a British basalt which, though closely allied in structure...structure to some of the Tertiary basalts of the Continent, belongs undoubtedly to the Carboniferous age.... Olivine nodules frequently occur in the Continental basalts and have been considered by some writers |
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| gyrolite, 173, 187 British Isles ENGLAl~D SW. England: coffinite, lxi Sykes, Bowland Forest High, Yorkshire:...Bray, Altarnun: uraninite, xc Wheal Owles, St. Just-in-Roseland: uraninite, 1081 Bj61fur, Seydisfj6rdur;...Seatoller Fell; Steel Fell; and Stonethwaite (all in Borrowdale): epidote, gyrolite, gismondine, and...Yewthwaite, Vale of Newlands: pyromorphite, 722 Derbyshire Calton Hill: olivine, ortho- and clinopyroxene, spinel...auricha]cite, 441 Harp Edge: aurichalcite, 441 Masson Hill, Matlock: cinnabar, xc Nestus mine, Matlock Bath: |
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| Ross ABSTRACT The remarkable xenolithic dyke described in this paper is one of the little-known swarm...dykes of probable Permian age in the Northern Highlands of Scotland. It is the first intrusion containing...xenoliths of ultrabasic rock to be recorded fnJm the Glenfinnan area, although such xenoliths have been...known(Permian age in Caithness in the extreme north of Scotland, and in Ayrshire and elsewhere in the south of...xenolithic dyke is seen in a deep gully high up in the corrie on the south side of the peaks Streap (2,988 |
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| 1984 The reversed alumina contents of orthopyroxene in equilibrium with spinel and forsterite in the system...Al203--SiO 2 T. Gasparik and R.C. Newton Department of the Geophysical Sciences, University of Chicago, Chicago...orthopyroxene coexisting with spinel and forsterite in the system M g O - A 1 2 0 3 - S i O 2 have been reversed...different P - T conditions, in the range 1,030-1,600~ C and 10-28kbar. The present data and three reversals...components MgzSi206 (En) and MgAlzSiO 6 (MgTs), to yield the following equilibrium condition (J, bar, K): ject |
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| Experimental Study of Spinel Clinopyroxenite Xenoliths from the Duncansby Ness Vent, Caithness, Scotland N. A. C...spinel-clinopyroxenite up to 15 cm in size occur in tuff in an isolated Permian vent on the Caithness coast at Duncansby...are also found in the tuff and in a body of monchiquite within the vent. Abstract. The spinel-clinopyroxenites...0.9) and their texture suggests the spinel to have exsolved from the augite. Experiments on representative...compositions at 18 kb (dry) indicate that all the spinel in the estimated average bulk composition (Sp4.gPx95 |
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| , Amsterdam [PD] Noble gas elemental abundances in polymorphs of silica J.G. MitchelP, P.R. Ineson b...Tyne, NE I 7R U, UK hEarth Sciences Unit, University of Sheffield, Sheffield, $3 7HF, UK CBritish Geological...Geological Survey, Keyworth, Nottingham, NG12 5GG, UK (Received March 7, 1991; revised and accepted March...Lawley, R.S., 1992. Noble gas elemental abundances in polymorphs of silica. Chem. Geol. (Isot. Geosci....36Ar, 84Kr and ~32Xe abundances have been determined in thirteen samples of macro- and crypto-crystalline |
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| are review,cal.Spinelgarnet stability relationships in these nodules are discussed and ar¢~shown to be controlled...chemical as well as physical (P/T) considerations. On the basis of a survey of spine~ compositions it is proposed...during the volatile c~aeged eruptions Depths of derivation increase from <60 kms for most nodules in alkali...nodules in kimberlites. The fact that Al-spinel Iherzolites are the m~;,stcommon nodule type in magmas...magmas of the alkali basalt suite whilst garnet Iherzolites are dominaW,in kimberlites is attributed to the |
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| THE AMERICAN LIQUID MINERALOGIST, VOL 50, OCTOBER, 1S65 CO, INCLUSIONS IN OLIVINE-BEARING NODULES...basaitic), r'ere Iound in the minerals of every occurrence of olivine-bearing nodules in basalts studied, from...from 72 localities throughout the worid. They were found in olivine, clinopyroxene, orthopyroxene, and...numbers of these inclusions are secondary in origin, trapped during the healing of fractures, but many are found...types require the existence of immiscible giobules of a dense, supercritical COz fluid in the basaltic liquid |
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| Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia Lung-Chuan Kuo* and Eric...cene alkali basalt unit erupted at the northwestern corner of the Tertiary Kishb Plateau (Saudi Arabia)...olivine, enstatite, and diopside. Sparse exsolution lamellae of high-Ca pyroxene occur in all the enstatite... Olivine neoblasts are, in many cases, in contact with one another, with the triple grain junctions rarely...undetectable by microprobe in spinel and olivine, whereas zoning of A1 in enstatite and diopside indicates |
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| Springer-Verlag 1988 Spinel-Lherzolite Xenoliths from the Aritain Volcano, NE-Jordan S. Nasir 1 and H. A1-Fuqha...xenoliths occur within the pyroclastic components of the Aritain volcano, NE-Jordan. The average modal composition...composition of the xenoliths is 67vo1.% olivine, 23vo1.% orthopyroxene, 9vo1.% clinopyroxene and 1.6vo1...texture. Selected electron probe analyses of enstatite, diopside, olivine, and spinel are given. Temperatures...Pressure estimates based on the spinel-lherzolite stability field restrict the xenolith source to a depth |
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| GEOLOGICAL SURVEY AND MUSEUM SOURCES OF ROAD AGGREGATE IN GREAT BRITAIN Second Edition PRICE 3s. 6d. NET •...SOURCES OF ROAD AGGREGATE IN GREAT BRITAIN Second Edition Compiled at the ROAD RESEARCH LABORATORY with...remarks on the geological distribution of roadstones by K. C. DUNHAM, D.Sc., S.D. (England and Wales)..... I GEOLOGICAL DISTRIBUTION OF R OADSTONES England and Wales (Fig. 1) 2 Scotland (Fig. 2) .. ...AGGREGATE IN GREAT BRITAIN PETROGRAPHICAL CLASSIFICATION T HE Petrographical Department of the Geological |
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| GEOLOGICAL SURVEY AND MUSEUM Sources of Road Aggregate in Great Britain Third Edition LONDON HER MAJESTY'S...GEOLOGICAL SURVEY AND MUSEUM Sources of Road Aggregate in Great Britain Third Edition LONDON HER MAJESTY'S...1960 •• FOREWORD THE second edition (1951) of "Sources of road aggregate in Great Britain" has become...become out-of-date owing to the closure of some of the sources, the opening of new sources and changes...existing sources. The present edition has been brought up-to-date on the basis of the latest information |
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| TITLES CLASSIC OF RELATED GEOLOGY INTEREST IN EUROPE SERIES l. Italian mlcanoes Chris Kilburn...)' Islands Juan Carlos Carracedo & Simon Day 5. The north of Ireland Paul Lyle 6. Leinster Chris Stillman...Costas Xenophontos 8. The Nortlrn·est Highlands of Scotland Con Gillen 9. The Inner Hebrides of Scotland...Scotland Con Gillen 11. The Gulf of Corinth Mike Leeder. Julian Andrews. Richard Collier. Rob Gawthorpe....A1ow11Pelee and the desrruction ~ 5 im-Pierre. Jfartinique Al\\yn Scarth Monitoring the Earth: physical |
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| FLEX READY TO USE VERY ECONOMICAL PRICE £2.60 MADE IN GT. BRITAIN AN IDE·AL CHRISTMAS GIFT SEE YOUR GEMTEK...4 Front St., Sandbach, Cheshire. PORTSOY MARBLE. The Marble Workshop. Portsoy, Bantfshlre. ROUGH & TUMBLE...WALMSLEY STREET, HULL HU3 1QD. GEMS The Great Conservation Issue The British Lapidary Magazine Vol. 3...Annual subscription (six copies) £1 post free In the UK. Overseas $3.25 (US) or £1.25 Our front cover:...Rogers In this Issue: Regular Future, Editorial Gulde to Clubs and Societies Letters to the Editor Book |
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| GEMSTON. = = O {the Br itish Isles VAL AXEL FIRSOFF Gemstones of the British Isles is the ideal book for...for the avid rock-hound to keep in his car or knapsack, next to his geological hammer, ready to identify...le Street. It is the first comprehensive guide to the location of gemstones in the United Kingdom and...hundred years. Based on many years’ personal experience in gemhunting and on a large number of references from...Firsoff has compiled an invaluable reference book for the ‘rock-hound’. A short introduction contains hints |
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| DEALERS - IN . ROCKS - LAPIDARY SUPPLIES - MACHINERY L.W .. S. Co .. 46 Walmsley Street, Hull Lapidary...to hold slabs and specimens, large and small Sole UK Distributors for . . GEMTEK LAPIDARY EQUIPMENT MK...RING-MAKING CONTEST The British lapidary Magazine The GEMS ring-making competition announced in our January/t=ebruary...standard. The three judges, meeting in Goldsmiths' Hall, London, early in April, announced the following...(six copies £1.20 post free in the U.K. Overseas $3.33 (US) or £1.25 In this Issue: Regular Featur. |
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| SOURCES OF ROAD AGGREGATE IN GREAT BRITAIN ROAD RESEARCH LABORATORY AND INSTITUTE OF G EO LOG lCA L...ENVIRONMENT RESEARCH COUNCIL Sources of Road Aggregate in Great Britain Fourth Edition . . . ,. l _, • '...(Il C I FOREWORD THE third edition (1960) of "Sources of road aggregate in Great Britain" has become...become out-of-date owing to the closure of some of the sources, the opening of new sources and changes...existing sources. The present edition has been brought up-to-date on the basis of the latest information |
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| BINNS ABSTRACT Basic and ultrabasic xenoliths found in Tertiary basaltic and lamprophyric volcanic rocks...pyroxenites and gabbros also occur. The xenoliths are unstable in their host rocks and show marked marginal...xenoliths has been observed in 40 per cent of other basaltic rocks in the New South Wales Tertiary volcanic...available in the literature favours the hypothesis that such xenoliths represent portions of the earth's...earth's mantle incorporated in magmas originating from within that zone. Analyses of xenoliths and host rocks |
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| A L T E R A T I O N OF C H R O M E SPI.~IEL IN A DUNITE NODULE FROM LANZAROTE, CANARY I S L A N D S THOMAS...SCH FAsch, T. 1971 : Alteration of chrome spinel in a :lunite nodule from Lar~zarote, Canary Islands...83-91. Chrome spinel coexisting with fresh olivine in a duni:e nodule from tuff shows partial to complete...variety of chz-omize. The spinel has the composition (Fe].4Mg0.6) (Feo.lCro.sAl 1.t)zO4; the chromite is variable:...of, and along cracks in, chromite and chrome spinel is very common (Kern 1968). The alteration is generally |
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| The Olivine-Orthopyroxene-Spinel Oxygen Geobarometer, the Nickel Precipitation Curve, and the Oxygen...Oxygen Fugacity of the Earth's Upper Mantle by H.St.C. O'NEILL 1 * AND V. J. WALL2 Research School of Earth...ABSTRACT The common upper mantle assemblage olivine-orthopyroxene-spinel may be used to calculate the oxygen...equilibrated. The equilibrium has been calibrated using the large amount of existing data on the thermodynamic...each phase in this assemblage. A by-product of this procedure is a new calibration of the olivine-spinel |
 | Hart, R.J., Andreoli, M.A.G., Smith, C.B., Otter, M.L., Durrheim, R. (1990) Ultramafic rocks in the centre of the Vredefort structure (South Africa): Possible exposure of the upper mantle?. Chemical Geology, 83 (3) 233-248 doi:10.1016/0009-2541(90)90282-c | Journal (article/letter/editorial) |
| Amsterdam - - Printed in The Netherlands 233 Ultramafic rocks in the centre of the Vredefort structure...structure (South Africa): Possible exposure of the upper mantle? R.J. Hart ~'*, M.A.G. Andreoli 2, C.B. Smith...Durrheim 3 JSchonland Research Centre, Universityof the Witwatersrand, Johannesburg 2050 (South Africa) 2Atomic...0001 (South Africa) 3BPI Geophysics, Universityof the Witwatersrand, Johannesburg 2050 (South Africa) 4Department...Ultramafic rocks in the centre of the Vredefort structure (South Africa): Possible exposure of the upper mantle |
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| as part of an ongoing effort to preserve the information in books and make it universally accessible...4 2 1837 SCIENTIA ARTES LIBRARY VERITAS OF THE MICHIGAN UNIVERSITY OF UEPLURIBUSUNUM TUE BORN...CONTAISING A SUMMARY OF THE MODERN THEORIES OF PETRO GENESIS , A DESCRIPTION OF THE ROCK-FORMING MINERALS...SYNOPSIS OF THE CHIEF TYPES OF THE IGNEOUS ROCKS AND THEIR DISTRIBUTION AS ILLUS TRATED BY THE BRITISH ISLES...LONDON SWAN SONNENSCHEIN & CO. , LIM. NEW YORK : THE MACMILLAN CO . 1909 First Edition , January 1891 |
