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coexisting pyroxenes

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Journal Article
Published: 01 December 2009
Mineralogical Magazine (2009) 73 (6): 929-942.
... complexities shown by the pyroxenes, the determination of phases coexisting at equilibrium is difficult and of limited significance. Here, we make some important points based on the spread of data in the pyroxene quadrilateral ( Fig. 3 ). The nature and composition of the crystallizing pyroxenes...
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Journal Article
Published: 01 February 1981
American Mineralogist (1981) 66 (1-2): 87-99.
... grunerite, ragged magnetite, and greenalite are retrograde. Based on (a) two-pyroxene geothermometry, (b) olivine–orthopyroxene geothermometry, and (c) the absence of evidence for the crystallization of pigeonite, the peak metamorphic temperature is estimated to have been 670 ± 50°C. Using Smith’s (1971...
Journal Article
Published: 01 February 1974
American Mineralogist (1974) 59 (1-2): 204-205.
...Edgar Froese; T. M. Gordon Abstract The ferrous iron-magnesium distribution between coexisting pyroxenes in granulites from Quairading, Australia, has been shown to be markedly dependent on chemical composition (Davidson, 1968). By assuming a simple-mixture solution model (Guggenheim, 1967...
Journal Article
Published: 01 April 1972
The Canadian Mineralogist (1972) 11 (2): 548-551.
Journal Article
Published: 01 April 1970
The Canadian Mineralogist (1970) 10 (2): 247-251.
Journal Article
Published: 01 May 1969
Geological Magazine (1969) 106 (3): 291-293.
Journal Article
Published: 01 September 1964
Geological Magazine (1964) 101 (5): 472-473.
Journal Article
Published: 01 September 1958
Geological Magazine (1958) 95 (5): 403-408.
...I. D. Muir; C. E. Tilley Abstract The compositions of pyroxene pairs in pyroxenite and gneiss from Scourie, Scotland, metamorphosed picrite basalt from Kilauea, hornfels from the Oslo district, and granulite from Ardnamurchan, Scotland, have been analyzed chemically and inferred optically. The tie...
Image
Compositions of three <b>coexisting</b> <b>pyroxenes</b> on phase diagrams of ( a )  Carp...
Published: 01 January 2009
F igure 8. Compositions of three coexisting pyroxenes on phase diagrams of ( a ) Carpenter (1980) , ( b ) Holland (1990) , and ( c ) Green et al. (2007) .
Image
<b>Coexisting</b> <b>pyroxene</b> (circles), olivine (dark filled squares), and melt (lig...
Published: 01 November 2008
F igure 7. Coexisting pyroxene (circles), olivine (dark filled squares), and melt (light filled squares) compositions with melt at pressures ranging from 800–1000 bars and temperatures ranging from 1155 to 1165 °C and with f O 2 between QFM – 2.7 to QFM – 3.0. Melt composition
Journal Article
Published: 01 December 1978
American Mineralogist (1978) 63 (11-12): 1116-1136.
...H. W. Jaffe; P. Robinson; R. J. Tracy Abstract Pyroxene-microperthite gneisses associated with anorthosite from the Mount Marcy area contain coexisting iron-rich orthopyroxene, augite, garnet, and hornblende, together with quartz, oligoclase, orthoclase, magnetite and ilmenite. Electron probe...
Published: 01 January 1962
DOI: 10.1130/Petrologic.1962.1
EISBN: 9780813759425
... Abstract This paper deals with the Fe ++ / Mg ratios in coexisting pyroxenes and in coexisting olivines and calcium-poor pyroxenes. Theoretical relations between these ratios are investigated by use of thermodynamic functions. The slopes of tie lines defined by the distribution of magnesium...
Journal Article
Published: 01 August 1976
American Mineralogist (1976) 61 (7-8): 603-615.
...J.-C. Mercier Abstract The available experimental data for the equilibrium reactions that characterize either the enstatite-diopside join or the Al-concentration in pyroxenes coexisting with an Al-rich phase are reduced to three or four thermodynamic constants, entropy, enthalpy, and change...
Journal Article
Published: 01 October 1992
American Mineralogist (1992) 77 (9-10): 1004-1020.
... the evolution of three well-studied igneous bodies: the Bishop Tuff, Thingmuli Volcano, and the Skaergaard Intrusion. The Fe-Ti oxides of the Bishop Tuffare not in equilibrium with ttre coexisting pyroxenes and quartz. Compositions of argite, Opx, and titaniferous magnetite are essentially constant throughout...
Journal Article
Published: 01 May 1962
Geological Magazine (1962) 99 (3): 283-284.
...A. L. G. Collee Abstract Relative to several previously published papers dealing with coexisting pyroxenes, shows that Bartholome's K t value of 1.8 for metamorphic pyroxenes and Kretz's K d value of 0.54 are reciprocals, and that the same is true for the values for magmatic pyroxenes, 1.4 and 0.73...
Journal Article
Published: 01 November 1961
Geological Magazine (1961) 98 (6): 530-531.
...D. R. Bowes; A. E. Wright; R. G. Park Abstract Additional discussion of the significance of compositional tie lines and coexisting pyroxenes, calling attention to the use of mineral analyses without regard to the petrography or the field relations of the rock. Work in Scourie (Scotland) is cited...
Journal Article
Published: 01 July 1961
Geological Magazine (1961) 98 (4): 346-348.
...Paul Bartholome Abstract Discussion of tie-lines for coexisting pyroxenes, in which it is pointed out that pyroxene associations in rocks are rather useless as geologic thermometers. GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index...
Journal Article
Published: 01 August 1976
American Mineralogist (1976) 61 (7-8): 643-652.
...S. K. Saxena Abstract Composition of coexisting ortho- and Ca-pyroxene or pigeonite may be used to estimate the temperature of crystallization at low to moderate pressures by solving the equation: (16) R T In X Mg − M 1 Cpx X Mg − M 2 Cpx γ Mg − M 2 Cpx = R T In a Mg − Opx − 5 00 where R is gas...
Journal Article
Published: 01 April 1967
American Mineralogist (1967) 52 (3-4): 436-474.
...Myron G. Best; Edward L. P. Mercy Abstract Chemical analyses of twenty coexisting pyroxenes, hornblendes, biotites, and ilmenites have been made from the Guadalupe igneous complex—a differentiated gabbroic intrusion which crystallized under a relatively high ∫H 2 O. The differentiates are similar...
Journal Article
Published: 01 February 1989
American Mineralogist (1989) 74 (1-2): 18-30.
... for coexisting pyroxenesand coexisting pyroxene + olivine + quarlz. New experiments on pyroxene + olivine+ quartz equilibria constrain the models. Preferred values of model parameters are used to generate component activities that are consistent with our choice of apparent standard-state energies. These values...