From Fred Emery, By Tim Congdon, By Our Business News Staff, By Our Political Editor, By Pearce Wright Science Correspondent, From Henry Stanhope, By Roger Vielvoye, From Robert Fisk., By David Wood Political Editor, By Geraldine Norman Sale Room Correspondent, From Our Correspondent, From Christopher Walker, By John Roper Medical Reporter, By Our Local Government Correspondent, By Our Social Services Correspondent, From Ronald Kershaw, From Arthur Osman, By Staff Reporters, By a Staff Reporter, From Patricia Clough, By Our Foreign Staff, From Michael Knipe, From Charles Hargrove, From Peter Strafford, From Harry Debelius, From David Cross, From Anthony Thomas United States Economics Correspondent, From Paul Martin, From Roger Berthoud, From Our Own Correspondent, From David Wigg, By Peter Marson, By Geoffrey Green Football Correspondent, By Jim Railton, By Sidney Friskin, By Michael Phillips Racing Correspondent, bt Catherine Ogden, by Helen Elizabeth Day, Edward Mayer, Stanley Sadie, David Wade, Barry Norman, Charles Lewsen, Alan Blyth, Max Harrison, Bevis Hillier, Pamela Vandyke Price, Roy Hay, John Carter, Harry Golombek, George Hutchinson, Alan Coren, Louis Heren, Peter Ryde, Michael Frenchman, Alison Ross, KEN HOWE, , DAVID MATHIESON, , JOHN HOTCHKIS, , MICHAEL ANDREWS, , JUDITH MARO, , Tyddyn Heulyn, , Minffordd, , Penrhyndeudraeth, , Meirionnydd, , MAURICE GLICKMAN, , LYNNE REID BANKS, , CHRISTOPHER GANDY, , K. A. S. M. IBRAHIM, , JOHN CATTERALL, , RICHARD SHEPPARD, , NEVILLE T. REES, , J. D. K. LLOYD, , Bron Hafren, , Garthmyl, , Montgomery, , ERIC DE MARE, , FLORA JACOBS, , GEOFFREY H. WILDE, , MARGARET MAISON, , PETER LONGMORE, , C. ARNOLD-BAKER, , E. D. YARDLEY, , By Paul Oestreicher, European Parliament, Prof John J. O'Meara, F.I.G., Sir Eric Drake, Mr Dennis Bird, By Melvyn Westlake, By R. W. Shakespeare, By Alan Hamilton Labour Staff, By Our Economics Staff, By Hugh Clayton, From Anthony Thomas, By Anthony Rowley, Ronald Irving, Ross Davies, John Drummond, FE, Margaret Stone, by Murray Sayle,
... Few war nerves · gold mines · Maple Macowards, Grouse, Magma Copper back to normal, Insurance claims: the experts ...
1973 - Gale Group | TDA
... K. Kurokawa, Takahiro Miwa, Hidemi Ishibashi Aging in magma rheology, Scientific Reports 12, no.11 (Jun 2022). ... Crystal Thermal Records May Give Conflicting Accounts of Magma Cooling, Journal of Geophysical Research: Solid Earth 127, ... 2021JB023530Bibhuti Gogoi, Hiredya Chauhan Dynamics of a subvolcanic magma chamber inferred from viscous instabilities owing to mafic-felsic magma interactions, Arabian Journal of Geosciences 14, no.1616 ( ... Gogoi, Hiredya Chauhan, Ashima Saikia Understanding mafic-felsic magma interactions in a subvolcanic magma chamber using rapakivi ...
Tópico(s): Geology and Paleoclimatology Research
1921 - University of Chicago Press | The Journal of Geology
Peter Tandy, Nicholas Watt Chief Ireland Correspondent, Jill Sherman and Valerie Elliott, David M. Evans, John Naughton, Tunku Varadarajan, Jon Ashworth, Matthew Wall, Brendan Martin, Paul Heiney, Portia Colwell, Andrew Pierce, Alexandra Frean, Rob Hughes, Jane MacQuitty, Simon Barnes, Richard Ford, Home Correspondent, Bill Frost, Catherine Field, Robert Breckman, Richard Hobson, David Rhys Jones, John Diamond, Gavin Lumsden, Philip Howard, G. P., Paul Massey, Barry Turner, James Bone, Rachel Campbell-Johnston, George Sivell, Fritz Spiegl, David Atkinson, Des Jenson, Carl Mortished, Ginny Dougary, Morag Preston, Tony Foreman, Tony Patrick, Tom Walker, Psyche, Ben Elton, Geoff Brown, Clare Stewart, Philip Bassett Industrial Editor, Joe Joseph, Louise Godfrey, Caroline Hendrie, Carl Evans, Hilary Stone, Alex Wijeratne, Nato Welton, Stephen McClarence, John O'leary Education Editor, Robert Sheehan, D. R., Stewart Tendler Crime Correspondent, David Charter Education Correspondent, Diana Miller, Richard Godfrey, N. Earl Mawby, Peter Ball, Ruth Gledhill, Debra Craine, Ken Coates, Ruth Gledhill Religion Correspondent, Dalya Alberge Arts Correspondent, Ian Morton, Stephen Farrell, Alan Hamilton, Robin Young, Peter Millar, Rodney Milnes, Nicholas Watt, Jenny MacArthur, Barbara Abbs, T. P., Eve-Ann Prentice, F. Hague, Marcus Williams, John Young, Harry Ritchie, Frances Bissell, David Hands, Charles Bremner, John A. Keen, Peter Barnard, Neil Sullivan, Lin Jenkins and Richard Ford, Nicholas Wapshott, Derwent May, Mary Loudon, Keith Scholes Makin, Lizanne Rose, Russell Kempson, Michael Freedland, Lowri Turner, Daniel McGrory, Wilf Stevenson, Director, Jonathan Lloyd, Tony Martin, Stephen Anderton, Paul Durman, Sarah Johnson, Laurence Haskell, Jenny Grove, George Brock, Michael Theodoulou, Sydney Friskin, Matthew Perry, L. G., Nathan Yates, Geoffrey Wansell, John Hopkins Golf Correspondent, Sara McConnell and Nathan Yates, George Plumptre, Christina Koning, David Amess, Adam Jones, Marcus Binney, Raymond Keene, Richard Fothergill, Adam Sage, David Powell and John Goodbody, David Robinson, Peter Davalle, John Russell Taylor, Emma Wilkins, P. W., Karen Zagor, Lucy Pinney, Frances Gibb, Legal Correspondent, P. H. S, James Allcock, P. C. M. Solon, Roland Brown, Stefano Hatfield, Rajnikant J. Mehta, Roy Roebuck, Nigel Hawkes, Ian Goodhardt, Caroline Merrell, Robin Neillands, Jill Sherman, Eric Reguly, Richard Owen, David Powell, Athletics Correspondent, Michael Calvin, Damian Whitworth, D. Pearson, Roger Boyes, Nigel Hawkes, Science Editor, Sarah Cunningham, Erica Wagner, Marcel Berlins, Louise Nicholson, James Landale and Polly Newton, Philip Webster, Political Editor, Stephanie Billen, Oliver Holt, Football Correspondent, David Hands Rugby Correspondent, Julian Muscat, Francis Abbott, Christopher Thomas, Anne Ashworth, Anna Freer, Eileen McCabe, Sara McConnell, Alan Copps, Robert Crampton, Chris Parker, Jane Shilling, Alex O'Connell, Craig Lord, Kathryn Knight, Philip Delves Broughton, Matthew Parris, A. C. Young, Adrian Mourby, Jim Crumley, Robert Richardson, G. M. Seeff, Tim Wapshott, Russell Jenkins, Alan Franks, Helen Mound, Jane Owen, Philip Webster and Jill Sherman, Peter Riddell, Ben MacIntyre, Malcolm Horsman, Mark Davies, P. D., Michael Gove, Richard Beeston, Brian Glanville, H. H. Huxley Professor, Jane Laidlaw, Graham Searjeant, Jason Cowley, Simon Jenkins, Hattie Ellis, David Sinclair, R. Chamuffin, Mary Wesley, Michael Horsnell, Alan Coren, Norma Bagshaw, Francis Beecheno, Heath Brown, Jill Parkin, Benedict Nightingale, Jill Crawshaw's, Tom Rhodes, Andrew Pierce, Polly Newton and Philip Webster, G. J. Sadow, Marianne Curphey, Frances Gibb Legal Correspondent, Nick Haddow, Jonathan Meades, Denis Dodds, Richard Morrison, James Gilbey, David Maddock, Michael Evans, Alan Jackson, Gerald Solomon, James Willoughby, Edward Marriott, Christopher Irvine, Christine Buckley, Industrial Correspondent,
... my life Golden tune Diary Wonderous Things Mankind, magma and the limties of life in the solar ...
1997 - Gale Group | TDA
... Juan Díaz‐Alvarado, Carlos Fernández, Olga García‐Moreno Magma Differentiation and Contamination, (May 2021): 105–124.https:// ... Carmela Freda, Mario Gaeta, Silvio Mollo, Luigi Dallai Magma Chambers Emplaced in Carbonate Substrate: Petrogenesis of Skarn ... Sottili, J. Taddeucci, D.M. Palladino Constraints on magma–wall rock thermal interaction during explosive eruptions from ... Anderson, T. K. Kyser Concomitant skarn and syenitic magma evolution at the margins of the Zippa Mountain ... Thermal limitations on incorporation of wall rock into magma, Geology 35, no.44 (Jan 2007): 319.https:// ...
Tópico(s): Geochemistry and Geologic Mapping
1922 - University of Chicago Press | The Journal of Geology
Wiley Online Library
From Christopher Thomas, , By Staff Reporters, By Craig Seton, From Ronald Kershaw, By David Felton, By Paul Routledge Labour Editor, From Mario Modiano, By John Huxley, By Donald Macintyre and George Clark, By Our Crime Reporter, By Our Labour Editor, By a Staff Reporter, By Michael Baily Transport Correspondent, By Nicholas Timmins, From Michael Leapman, By David Felton Labour Reporter, By Arthur Reed Air Correspondent, From Diana Geddes Education Correspondent, From Our Correspondent, By Derek Barnett, By Stewart Tendler, By John Young Planning Reporter, By Christopher Warman Local Government Correspondent, From Arthur Osman, By Pat Healy Social Services Correspondent, From Denis Taylor, From Nicholas Ashford, From Douglas Aiton, From David Watts, From Peter Hazelhurst, From Patrick Brogan, From Our Own Correspondent, From Ivor Davis, By Clifford Longley Religious Affairs Correspondent, From David Cross, From Patricia Clough, From Karan Thapar, From Robert Fisk, From Steven Fay, From Christopher Walker, From Moshe Brilliant, From Tewfik Mishlawi, From Sinan Fisek, Diana Geddes Education Correspondent, R. W. Luxton, Sheridan Morley, Irving Wardle, John Percival, Ned Chaillet, Hilary Finch, Joan Chissell, From Clive White, By Sydney Friskin, By John Woodcock Cricket Correspondent, By Rex Bellamy Tennis Correspondent, By Keith Macklin, By Peter West Rugby Correspondent, By Pamela Macgregor-Morris, By Michael Phillips Racing Correspondent, From a Special Correspondent, Baron Phillips, Louis Heren, Michael Horsnell, Bernard Levin, P. O'R. SMILEY, , RICHARD GORDON, , J. A. COULTER, , PATRICIA TYE, , IAN M.ELLIS, , NICOLAS STACEY, , J. L. BOWRON, , A. HOLDSWORTH, , P. H. TURNER, , GLANVILLE WILLIAMS, , J. D. HUTEAU, , MONICA VINCENT, , PETER WALMSLEY, , STEPHEN TODD, , REX B. COWAN, , B. D. ROSS, , From Our Diplomatic Correspondent, By the staff of Nature, By Charles McKean Architecture Correspondent, By Norman Hammond, Archaeology Correspondent, By Tony Samstag, Miss Helen F. Grant, By Nicholas Hirst Energy Correspondent, By Catherine Gunn, Edward Townsend, By Edward Townsend, From Peter Norman, By Rosemary Unsworth, From Anthony Hilton, By Derek Harris Commercial Editor, Derek Harris, By Peter Hill, Donald Macintyre, By Derek Harris, By Bill Johnstone, P. A. S. WISE, , PATRICK MINFORD, , G. H. CHAMPION, , N. R. WILSON, , BY THE FINANCIAL EDITOR, David Hewson, Peter Norman, John Grieve Smith, By Philip Robinson, By Richard Allen, By Peter Wilson-Smith, By Margareta Pagano, By Our Financial Staff, J.E., Gordon Wharton editor, Travel News, John Earle, Christopher Koenig, Arthur Reed Air Correspondent, Joyce Rackham, Nicholas Wapshott, Jeremy Black, Doone Beal, Nicholas, Christopher,
... Finance: Discount market, Rally in London sugar futures, Magma offer increased, LME metal stocks, Engineers adjust the ...
1981 - Gale Group | TDA
Marland P. Billings, N. B. Keevil,
... 01, 1946 PETROGRAPHY AND RADIOACTIVITY OF FOUR PALEOZOIC MAGMA SERIES IN NEW HAMPSHIRE M. P BILLINGS; M. ... B KEEVIL; PETROGRAPHY AND RADIOACTIVITY OF FOUR PALEOZOIC MAGMA SERIES IN NEW HAMPSHIRE. GSA Bulletin 1946;; 57 ( ... are intruded by igneous rocks belonging to four magma series, the oldest of which is late Ordovician (?), the youngest of which is Mississippian (?). Each magma series consists of rocks ranging from gabbro, diorite, ... specimens from a rock type within a single magma series commonly show considerable range in radioactivity, the ...
Tópico(s): Geochemistry and Geologic Mapping
1946 - Geological Society of America | Geological Society of America Bulletin
Geological Society
Julia Llewellyn Smith, Anthony Harris, Jon Ashworth, Vincent Brome, Andrew Pierce, David Whitaker, Anatol Lieven, Arthur Leathley and Alice Thomson, Rob Hughes, Simon Barnes, Richard Ford, Home Correspondent, Richard Pring, (Director), Sheila Gunn, Political Correspondent, Sheila Giblin (Registration and Inspection officer), Janet Bush, Economics Correspondent, Malcolm Pheasey, Tony Evans, Chairman, Philip Howard, Hilary Finch, Peter Duboff, Jeremy Kingston, Bryan Gibson, Lynne Truss, Carl Mortished, Nicholas Wood and Jill Sherman, Kevin Eason, Motoring Correspondent, Nick Nuttall, Environment Correspondent, Sir Frederick Lawton, Tony Patrick, Colin Narbrough, Geoff Brown, Della Mason, Bernard Levin, Martin Fletcher and Christopher Walker, Joe Joseph, Jeremy Laurance, Health Services Correspondent, Michael Dynes Whitehall Correspondent, Malcolm Bradbury, John O'leary Education Editor, Kingsley Amis, Stewart Tendler Crime Correspondent, Peter Kemp, Peter Waymark, Robin Young, Nicholas Watt, Michael Clark, Philip Robinson, Michael Hamlyn, Margaret Thatcher, C. Wright, Keith Pike, Eve-Ann Prentice Diplomatic Correspondent, Charles Bremner, Woodrow Wyatt, Norman Hammond Archaeology Correspondent, Philip Bassett, Industrial Editor, G. J. A. Hunter, Mathematics Department, Derwent May, Simon Tait, Susan Gilchrist, Edward Fennell, Adam Lebor, Margot Norman, Colin Campbell Mining Correspondent, Michael Hackett, George Brock, Robert Kirley, John Goodbody and Jonathan Mirsky, David Miller, Colin Jenkins, Principal, Alison Roberts, John Hopkins Golf Correspondent, W. L. Webb, Raymond Keene, Peter Davalle, John Goulandris, John Russell Taylor, Alan Lee, Cricket Correspondent, Craig Brown, Paul Wilkinson, Robin Hill, Kenneth Fee, Nigel Hawkes, Oliver Holt, George Sivell, Assistant Business Editor, Nicholas Wood and Ross Tieman, Roger Boyes, Rodney Hobson, David Hands Rugby Correspondent, Nicholas Wood, Harvey Elliott, Travel Correspondent, Richard Duce, Joanna Pitman, Mary Ann Sieghart, Philip Webster Political Editor, Matthew Parris, J. D. Sheldon, General Secretary, Richard Evans Racing Correspondent, Scrivenor, Eve-Ann Prentice and Joel Brand, Alan Lee, Peter Riddell, Ben MacIntyre, David Holloway, Theo Vance Packman, Stephen Pettitt, Kate Bassett, Christopher Elliott, Benedict Nightingale, Derek Harris, Dr Thomas Stuttaford, Frances Gibb Legal Correspondent, Patricia Tehan Banking Correspondent, Nicholas Anderson, (Director), Michael Evans, John Phillips, John D. Taylor, Ross Tieman, Colin Campbell, Sarah Bagnall Insurance Correspondent,
... Land gain Honda move CHG slips Refuge payout Magma puts shine on copper Morgan Crucible keeps on ...
1993 - Gale Group | TDA
... wide distribution of felsic differentiates of alkaline basaltic magma, in the form of lavas and intrusions, in ... 2) the availability, for extrusion, of alkaline basaltic magma long before (Calciferous Sandstone to Millstone Grit times) ... dolerite; (3) the common occurrence of alkaline basaltic magma as lava flows in Carboniferous and in Permian ... the availability, for dyke-formation, of alkaline basaltic magma (in the form of basanite, camptonite, monchiquite etc.) ... shortly after the intrusion of calc-alkaline basaltic magma (in the form of quartz-dolerite and tholeiite ...
Tópico(s): Paleontology and Stratigraphy of Fossils
1948 - Geological Society of London | Quarterly Journal of the Geological Society
... of what can be dissolved in the erupting magma at depth, and the rate of gas accumulation ... benmoreite, and basalt, which suggests that the basaltic magma intruded a pre-existing rhyolitic magma chamber, and ultimately triggered the eruption. The mixed ... interpreted to result from 210Po degassing of basaltic magma and the accumulation of 210Po-enriched gas, either ... interface, or in the pre-existing residual rhyolitic magma chamber. From a simple model of radon and ... reservoir, the ratio of the mass of basalt magma degassing over the mass of magma accumulating the ...
Tópico(s): Nuclear materials and radiation effects
1965 - Elsevier BV | Nuclear Instruments and Methods
... 1959-60 eruption of Kilauea Volcano, the outpouring magma was sampled systematically to obtain detailed information on ... new insight into the preeruptional crystallization of basaltic magma, entailing intratelluric depositions of various phenocrysts and migration ... first silicate mineral to separate from the primitive magma.A direct relationship between the olivine content of ... of lava discharge suggests that strong currents of magma erode beds of previously sedimented olivine crystals lying on the uottom of the magma chamber.The coolest, olivine-poor summit lavas contained ...
Tópico(s): Geology and Paleoclimatology Research
1966 - United States Government Publishing Office | USGS professional paper
T. L. WRIGHT, Richard S. Fiske,
... suggest the following conclusions: The chemical composition of magma erupted at Kilauea summit varies with the date ... eruption. During late prehistoric time pockets of differentiated magma were formed within the rift zones by separation ... remaining after partial crystallization of bodies of summit magma. This process presumably is still going on within ... the liquid line of descent for Kilauea summit magma of prehistoric composition but not on any liquid ... of 1955, are best explained by mixing of magma supplied from a central reservoir beneath Kilauea summit ...
Tópico(s): Geological and Geophysical Studies
1971 - Oxford University Press | Journal of Petrology
... Chief Granite originated as an almost completely liquid magma with a water content of at least 3 ... 44), hornblende, biotite, magnetite, and ilmenite as the magma stabilized at depth. After less than 5% crystallization, the magma again moved upward to form a laccolithic magma chamber whose roof was near a depth of 4 km. This magma chamber was zoned from a core with bulk ... not water saturated. In the core of the magma chamber, sanidine crystallized briefly and was then rimmed ... sanidine and oligoclase continued to coexist.After the magma was 30% to 50% crystallized, extensive assimilation of ...
Tópico(s): earthquake and tectonic studies
1978 - Geological Society of America | Geological Society of America Bulletin
... maximum heat transfer possible from a sphere of magma ascending through a viscous lithosphere is estimated using ... set of cooling curves are calculated for a magma ascending at a constant velocity beneath an island arc. If the magma is to arrive at the surface without solidifying ... 8 × 10−3 cm s−1, for a magma radius of 1 km, and greater than about ... 7 × 10−5 cm s−1, for a magma radius of 6 km. If the magma begins its ascent crystal free it will generally ... transfer to or from a spherical body of magma ascending at these velocities is given approximately by ...
Tópico(s): Phase Equilibria and Thermodynamics
1978 - Elsevier BV | Earth and Planetary Science Letters
Paul Charles Bateman, Warren J. Nokleberg,
... residual solid material (restite) carried upward in the magma from the place of origin of the magma, together with crystals precipitating from the melt phase, was progressively cleared from the magma by settling downward and/or by accretion to the solidifying margins of the magma chamber. The kind, composition, and proportion of crystals ... solid material from the source region of the magma; (2) more calcic rims of plagioclase crystals in the marginal rock indicate that the Mount Givens magma was at a higher temperature when the exposed ...
Tópico(s): Geology and Paleoclimatology Research
1978 - University of Chicago Press | The Journal of Geology
B. Booth, R. Croasdale, George P. L. Walker,
... eruption 5000 years ago, of a broad trachytic magma chamber underlying the Agua de Pau and Furnas volcanoes which basaltic magma has since been unable to penetrate.FootnotesThis text ... selective assimilation of hydrothermal minerals during pre-eruptive magma ascent of the 2010 summit eruption of Eyjafjallajökull ... H (2007) Time scales of formation of zoned magma chambers: U-series disequilibria in the Fogo A ... BEIER C, HAASE K and HANSTEEN T (2006) Magma Evolution of the Sete Cidades Volcano, São Miguel, ...
Tópico(s): Tree-ring climate responses
1978 - Royal Society | Philosophical Transactions of the Royal Society of London Series A Mathematical and Physical Sciences
Magma mixing is a widespread, if not universal igneous phenomenon of variable importance. The evidence for magma mixing is found primarily in glassy tephra; the ... than the proportion of crystals in the hybrid magma; therefore, by heat budget argument, the contaminant was ... suggest coexistence of basaltic and silicic melts within magma systems. Evidence of contamination is present in most tephra studied so far. Magma mixing appears to be the prevalent process whereby contamination occurs. Magma mixing seems to be particularly evident in systems ...
Tópico(s): Mineralogy and Gemology Studies
1976 - Elsevier BV | Journal of Volcanology and Geothermal Research
Hitoshi KOIDE, Somdev Bhattacharji,
... elasticity in an infinite elastic rock medium around magma reservoirs of various aspect ratios and the criteria ... graben) in domal uplift related to intrusions of magma bodies of various shapes and sizes. The relations ... fluids are discussed in the light of excess magma and hydrothermal fluid pressures. Caldera subsidence and dominant ... interpretations, related to intrusion(s) of vertically elongated magma cupolas and high magma and hydrothermal fluid pressures. This differs from Anderson' ... dipping ring fractures are due to lower relative magma pressure than lithostatic pressure. Wedging action of magma ...
Tópico(s): Seismic Imaging and Inversion Techniques
1975 - | Economic Geology
B. D. Marsh, I. S. E. Carmichael,
... the P-T curve of equilibration of andesite magma and quartz eclogite to be calculated by using ... C. The calculated amount of H2O in this magma at source is less than 0.75 wt %. In contrast to other models of magma genesis in the Benioff zone, we propose a ... crust contains only small amounts of potential andesitic magma. Moreover, since active andesite volcanoes do not extend ... to be a long, thin, narrow tube of magma that extends laterally along the length of the ... 70 km and a viscosity contrast between the magma and the mantle of 10−9 poise, the ...
Tópico(s): earthquake and tectonic studies
1974 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Robert Reilinger, Jack Oliver, L. D. Brown, Allan Sanford, Emery I. Balazs,
... New measurements of crystal doming over the Socorro magma body, New Mexico Robert Reilinger; Robert Reilinger 1Department ... New measurements of crystal doming over the Socorro magma body, New Mexico. Geology 1980;; 8 (6): 291– ... to be the upper boundary of an extensive magma body. The spatial coincidence of the zone of uplift and the presumed magma body, the persistent microearth-quake activity, and the ... observed movements result from expansion of the Socorro magma body. Although available data are not sufficient to ...
Tópico(s): Seismic Waves and Analysis
1980 - Geological Society of America | Geology
... that immediately after or during initial emplacement of magma, several characteristics of the basal contact zone developed.Silicate magma and a sulfide-oxide liquid were injected into ... for locally complicated geologic relations.Some early silicate magma was emplaced in rocks that were cool enough ... subophitic, and ragged-textured noncumulates.Subsequent injections of magma cooled more slowly and developed textures characteristic of ... crystallized by relatively rapid cooling or quenching of magma within the main chamber near the contact with ...
Tópico(s): Geochemistry and Geologic Mapping
1979 - United States Government Publishing Office | USGS professional paper
... a model in which: (1) The mare basalt magma source region lies between the crustmantle boundary and ... from that of the very low TiO 2 magma source regions (0.2% ilmenite) to that of the very high TiO 2 magma source regions (9% ilmenite). These density‐graded bands ... ilmenite, and chromite settled out of a convecting magma (which was also parental to the crust) in ... settling of the crystals, the heating of the magma at the bottom of the convection cells resulted ... the crust‐mantle boundary where they pooled in magma storage chambers. The magmas remained in these chambers ...
Tópico(s): earthquake and tectonic studies
1982 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Paul T. Delaney, David D. Pollard,
... considerably lower. As heat exchange between an invading magma and wall rocks commences, temperatures near dike margins ... solidus temperatures, and a layer of cooled, solidified magma is thus present between the wall rocks and the uncooled magma flowing in the center of the dike. The ... of this layer is controlled by dike thickness, magma flow rate, distance from the source region, temperature difference between magma and host rocks, and temperature dependence of magma viscosity. In agreement with available data obtained during ...
Tópico(s): Geology and Paleoclimatology Research
1982 - Yale University | American Journal of Science
Some volcanoes erupt magma at average rates which are constant over periods of many years, even though this magma may appear in a complex series of eruptions. ... of a curve of cumulative volume of erupted magma, which is linear for steady state volcanism, and ... that Q ss is the rate at which magma is supplied to these polygenetic volcanoes. Five general ... terms of a simple model of batches of magma rising buoyantly through the crust and interacting with a small‐capacity subvolcanic magma reservoir. Recognition of previous steady state behavior at ...
Tópico(s): Cryospheric studies and observations
1982 - American Geophysical Union | Journal of Geophysical Research Atmospheres
Wendell A. Duffield, Robert L. Christiansen, Robert Y. Koyanagi, Donald W. Peterson,
... Kilauea Volcano consists of a broad region of magma generation in the upper mantle, a steeply inclined zone through which magma rises to an intravolcano reservoir located about 2 ... volcano, and a network of conduits that carry magma from this reservoir to sites of eruption within ... Ulu diverted a continuing supply of mantle-derived magma to prolonged storage in the summit reservoir. Rapid ... essentially the same rate at which mantle-derived magma was supplied to Kilauea between 1952 and the ... activity at Mauna Ulu. Thus, part of the magma rising from the mantle to feed the Mauna ...
Tópico(s): Geology and Paleoclimatology Research
1982 - Elsevier BV | Journal of Volcanology and Geothermal Research
Gerhard Westra, Stanley B. Keith,
Molybdenum deposits are classified by using magma series chemistry expressed as K (sub 57.5) (i.e., the K 2 O content at 57.5% SiO 2 in a magma series); the F, Nb, Rb, and Sr contents ... No molybdenum deposits have been found in calcic magma series. Calc-alkaline stockwork molybdenum deposits are associated with calc-alkalic and high K calc-alkalic magma series (K (sub 57.5) 2.5), alkali-calcic, and alkalic magma series. Source plutons contain from 25 to in ... sub 57.5) > 2.5) and alkali-calcic magma series characterized by moderate enrichment in Nb, Rb, ...
Tópico(s): earthquake and tectonic studies
1981 - | Economic Geology
The mechanisms by which magma migrates from the point in the earth's interior where melting occurs to the earth's surface are poorly understood. ... paper several aspects of this problem are examined. Magma can migrate upward due to its differential buoyancy ... scale of crystalline grains or as large dispairs. Magma transport is an effective means of heat transport. Magma transport at a rate of 0.15 cm/ ... flow of 10-6 cal/cm2 s. If magma encounters country rock witha lower melting point the original magma is likely to solidify while melting the country ...
Tópico(s): earthquake and tectonic studies
1981 - Elsevier BV | Journal of Volcanology and Geothermal Research