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| Petrology of the Uppermost Upper Mantle Deduced From Spinel-Lherzolite and Harzburgite Nodules at Calton...Calton Hill, Derbyshire Colin H. Donaldson Department of Geology, University of Manchester, Manchester...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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| journal homepage: www.elsevier.com/locate/lithos The lithosphere–asthenosphere system beneath Ireland...UCM), ES-28040 Madrid, Spain ARC Key Centre for the Geochemical Evolution and Metallogeny of Continents...a c t The lithosphere–asthenosphere boundary (LAB) depth represents a fundamental parameter in any quantitative...large extent the temperature distribution within the crust and the uppermost mantle. The tectonic history...Paleozoic closure of the Iapetus Ocean across the Iapetus Suture Zone (ISZ), and in northeastern Ireland |
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| JOURNAL OF THE RUSSELL SOCIETY The journal of British Isles topographical mineralogy EDITOR: George...Australia B. Young, Newcastle, U.K. Aims and Scope: The Journal publishes refereed articles by both amateur...relating to the British Isles. Contributions are welcome from both members and non-members of the Russell...be found at the back of this issue, or obtained from the editor. Subscription rates: The Journal is free...free to members of the Russell Society. Subscription rate for non-members is £15 for two issues. Enquiries |
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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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| Springer-Verlag 1986 Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia Lung-Chuan...Two spinel harzburgite xenoliths from a Pleisto- cene alkali basalt unit erupted at the northwestern...northwestern corner of the Tertiary Kishb Plateau (Saudi Arabia) are characterized by an incipient transition from...pyroxene occur in all the enstatite porphyroblasts. Olivine neoblasts are, in many cases, in contact with...with one another, with the triple grain junctions rarely approaching 120 ~. Chemical zoning is undetectable |
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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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| 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...Pressure estimates based on the spinel-lherzolite stability field restrict the xenolith source to a depth...depth of 37 to 60 kin. Up to 18% Xcr in spinel indicates an origin from a maximum depth of 60 kin. Zusammenfassung |
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| Mineral Reconnaissance Programme The potential for diamonds in Britain Department of Trade and Industry...Report 135 Technical Report WF/95/1 The potential for diamonds in Britain R C Leake, J D Cornwell, K E...Reconnaissance Programme Report 135 The potential for diamonds in Britain R C Leake, J D Cornwell, K E...report was prepared for the Department of Trade and Industry Maps and diagrams in this report use topography... Rollin, K E and Styles, MT. 1995. The potential for diamonds in Britain. British Geological Survey Technical |
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| Springer-Verlag 1979 Spinel-Olivine Geothermometry in Peridotites From Ultramafie Complexes Jacques Fabri6s...Paris, France Abstract. An empirical calibration of the spinel-olivine geothermometer (Evans and Frost, 1975)...parageneses of lherzolitic rocks. In ultramafic complexes, most of the derived temperature estimates range...A comparison of the different thermometric data in two well studied occurrences, the Ronda ultramafic...ultramafic complex and the San Carlos xenolith field, suggests that differential rates of diffusion and recrystalization |
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| 93:207-214 9 Springer-Verlag1986 Constraints on the origin of mafic alkaline voleanies and included xenoliths...limited range in (metamorphic) textures and modal mineralogy, there is significant variation in mineral chemistry...chemistry. Mineral thermometric data applied to the geotherm of O'Reilly and Griffin (1985) suggests equilibration...compositional variations exist over a small depth interval in the subcontinental mantle. Basaltic host rocks show...have been used to constrain the modal amounts of clinopyroxene and garnet in a presumed garnet peridotite |
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| Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered...Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK International Geology Review Publication details...effort to ensure the accuracy of all the information (the “Content”) contained in the publications on...whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions...views expressed in this publication are the opinions and views of the authors, and are not the views of or |
 | 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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| Geol. Mag. 134 (6), 1997, pp. 771–779. Printed in the United Kingdom © 1997 Cambridge University Press...Press 771 Post-entrainment mineral–melt reactions in spinel peridotite xenoliths from Inver, Donegal,... Abstract – Spinel lherzolite and harzburgite xenoliths hosted in an alkali basalt dyke near Inver, Donegal...evidence of interaction between xenolith minerals and the host melt. Of particular interest are primary Cr-diopside...are associated with veinlets of devitrified glass. The coronas comprise secondary Crdiopside with vermicular |
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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 |
 | | Book |
| 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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| Petrol (1983) 82: 42-51 9 Springer-Verlag 1983 The Parabolic Pattern of Chromium Partitioning Observed...of the published analyses of pyroxene and spinel from natural ultramafic rocks indicated that the chromium...orthopyroxene increased with the increase of coexisting spinel until the Cr to A1 ratio reached unity...unity. Beyond this point the chromium content of orthopyroxene decreased as the spinel became more chromiferous...orthopyroxene and spinel may be explained in terms of chemical equilibria in the pyroxene-olivine-spinel assemblage |
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| June 16, 2015 Carboniferous and Permian magmatism in Scotland B. G. J. U P T O N 1, D. S T E P H E N S...of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK (e-mail." bupton@glg.ed.ac.uk) 2British Geological...EH9 3LA UK 3British Geological Survey, Maclean Building, Wallingford, Oxfordshire OXIO 8BB, UK Abstract:...Abstract: Extensional tectonics to the north of the Variscan Front during the Early Carboniferous generated...fault-controlled basins across the British Isles, with accompanying basaltic magmatism. In Scotland Dinantian magmatism |
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| Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered...Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK International Geology Review Publication details...http://www.tandfonline.com/loi/tigr20 Petrochemistry of the Mantle beneath Thailand: Evidence from Peridotite...Taylor & Gregory A. Snyder (1999) Petrochemistry of the Mantle beneath Thailand: Evidence from Peridotite...effort to ensure the accuracy of all the information (the “Content”) contained in the publications on |
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| Company, Amsterdam - Printed in The Netherlands Na AND Cr CONTENTS IN CLINOPYROXENES FROM PERIDOTIT’ES:...version received January 28,198l The compilation of data available in the literature and new analyses show...richer in Na and poorer in Cr in peridotites associated with high-grade metamorphic rocks than in ultramafites...drawn in the Na-Cr plot. This fact is related to the large amount of basic magma provided by the oceanic...along the midoceanic ridges. Application of this NaCr diagram to clinopyroxenes from peridotites in erogenic |
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| journal homepage: www.elsevier.com/locate/lithos The lithosphere–asthenosphere system beneath Ireland...modeling Petrology Geophysics a b s t r a c t Modeling the continental lithosphere's physical properties, especially...inconsistencies and erroneous interpretations. Using the LitMod approach for hypothesis testing and first-order...made about crustal information and the probable compositions of the lithospheric and sub-lithospheric...topographic elevation. The critical crustal parameter is density, leading to ca. 600 m error in topography for |
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| Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered...Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK International Geology Review Publication details...Geosciences Institute, Department of Geological Sciences , The University of Tennessee , Knoxville, TN, 37996-1410...effort to ensure the accuracy of all the information (the “Content”) contained in the publications on...whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions |
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| 0022-3530/89 $3.00 The Mineral Chemistry of Ultramafic Xenoliths of Eastern China: Implications for...for Upper Mantle Composition and the Paleogeotherms Department of Geology, Washington State University...basalts in all parts of eastern China. From their modal composition and mineral chemistry all the xenoliths...depleted mantle (spinel harzburgite and dunite), and inclusions cognate with the host alkali basalts at...between the mineral compositions of each type. Spinel shows a wide compositional range and the spinel |
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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 |
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| Petrol. 12, 245--314 (1966) Ultramafic Inclusions in Basaltic Rocks from Hawaii RICHAt~D W . W H I T E...e s . . . . . . . . . . . . . . . . k) Inclusions in Olivine Tholeiite . . . . . . . . . . . . . . . ... . . . . . . . . . . E. Compositions of Minerals in Inclusions . . . . . . . . . . . . . . . . . . 1...n a in Inclusions . . . . . . . . . . . . . . . . . . . G. R e a c t i o n P h e n o m e n a in Inclusions...IneJusions in Alkaline Olivine B a s a l t . . . . . . . . . . . . . . . . . . 3. Inclusions in Ol'vine |
