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Journal Article

Experimental constraints in the CMAS system on the Ca-Eskola content of eclogitic clinopyroxene Available to Purchase

Nadia Knapp, Alan B. Woodland, Kevin Klimm
Published: 01 December 2013
European Journal of Mineralogy (2013) 25 (4): 579–596.
DOI: https://doi.org/10.1127/0935-1221/2013/0025-2326
... had pyroxene stoichiometry in the simple system CaO–MgO–Al 2 O 3 –SiO 2 ± Na 2 O (CMAS ± Na), which restricts possible end-member components to diopside (di), calcium-Tschermaks (CaTs), calcium-Eskola (CaEs), and clinoenstatite (en), ±jadeite. All run products had a typical eclogitic mineral...
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View PDF for article title, Experimental constraints in the <span class="search-highlight">CMAS</span> <span class="search-highlight">system</span> on the Ca-Eskola content of eclogitic clinopyroxene
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Journal Article

Liquid-forsterite-anorthite-spinel assemblage at 1 bar in the CMAS system; implications for low-pressure evolution of high-Al and high-Mg magmas Available to Purchase

Henri Soulard, Pierre Boivin, Guy Libourel
Published: 01 October 1994
European Journal of Mineralogy (1994) 6 (5): 633–646.
View PDF for article title, Liquid-forsterite-anorthite-spinel assemblage at 1 bar in the <span class="search-highlight">CMAS</span> <span class="search-highlight">system</span>; implications for low-pressure evolution of high-Al and high-Mg magmas
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Journal Article

The Δ H of reaction and recalibration of garnet-pyroxene-plagioclase-quartz geobarometers in the CMAS system by solution calorimetry Available to Purchase

James O. Eckert, R. C. Newton, O. J. Kleppa
Published: 01 February 1991
American Mineralogist (1991) 76 (1-2): 148–160.
View PDF for article title, The Δ H of reaction and recalibration of garnet-pyroxene-plagioclase-quartz geobarometers in the <span class="search-highlight">CMAS</span> <span class="search-highlight">system</span> by solution calorimetry
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Back-scattered electron micrographs of run products in the CMAS system with calculated Ca-Eskola end-member. a) XCaEs = 19.1 mol %, b) XCaEs = 14.9 mol %, c) XCaEs = 16.7 mol % and d) XCaEs = 9.9 mol %. In all samples clinopyroxene (cpx) coexists with garnet (grt) and coesite (coe).

Back-scattered electron micrographs of run products in the CMAS system with... Available to Purchase

Published: 01 December 2013
Fig. 4 Back-scattered electron micrographs of run products in the CMAS system with calculated Ca-Eskola end-member. a) X CaEs = 19.1 mol %, b) X CaEs = 14.9 mol %, c) X CaEs = 16.7 mol % and d) X CaEs = 9.9 mol %. In all samples clinopyroxene (cpx) coexists with garnet (grt) and coesite (coe).
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Pressure-composition phase diagram for the CMAS system showing the fit of the calculated isotherms (°C) to the experimentally determined alumina contents of orthopyroxene. Bars with circles are data from Gasparik (1984c); empty bars at 1 bar are data from Carlson (1989); empty bars at 15–40 kbar are data from Perkins and Newton (1980), except the bar at 1500°C/30 kbar, which is from Howells and O’Hara (1978); empty bars at 50 kbar are data from Brey et al. (1986).

Pressure-composition phase diagram for the CMAS system showing the fit of t... Available to Purchase

Published: 01 January 2000
Figure 6. Pressure-composition phase diagram for the CMAS system showing the fit of the calculated isotherms (°C) to the experimentally determined alumina contents of orthopyroxene. Bars with circles are data from Gasparik ( 1984 c ); empty bars at 1 bar are data from Carlson ( 1989 ); empty
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Pressure-composition phase diagram for the CMAS system showing the fit of the calculated isotherms (°C) to the experimentally determined alumina contents of clinopyroxene. Bars with circles are data from Gasparik (1984c); empty bars at 1 bar are data from Carlson (1989); empty bars at 15–40 kbar are data from Perkins and Newton (1980), except the bar at 1500°C/30 kbar, which is from Howells and O’Hara (1978); empty bars at 50 kbar are data from Brey et al. (1986).

Pressure-composition phase diagram for the CMAS system showing the fit of t... Available to Purchase

Published: 01 January 2000
Figure 7. Pressure-composition phase diagram for the CMAS system showing the fit of the calculated isotherms (°C) to the experimentally determined alumina contents of clinopyroxene. Bars with circles are data from Gasparik ( 1984 c ); empty bars at 1 bar are data from Carlson ( 1989 ); empty
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Temperature-pressure phase diagram for the CMAS system calculated with the new model. Heavy solid lines are univariant boundaries and solidus. Thin lines are isopleths indicating, if solid, the Al contents (100 Al per 6 oxygens) of pyroxenes (1–40) and garnet (95–99) and the Ca contents (100 Ca per 6 oxygens) of orthopyroxene (dash-dot) and clinopyroxene (dashed). Solidus is based on Gudfinnsson and Presnall (1996) and Gasparik (1996). Heavy dashed line is the model continental geotherm of Pollack and Chapman (1977) for the surface heat flow of 40 mW/m2.

Temperature-pressure phase diagram for the CMAS system calculated with the ... Available to Purchase

Published: 01 January 2000
Figure 8. Temperature-pressure phase diagram for the CMAS system calculated with the new model. Heavy solid lines are univariant boundaries and solidus. Thin lines are isopleths indicating, if solid, the Al contents (100 Al per 6 oxygens) of pyroxenes (1–40) and garnet (95–99) and the Ca contents
Journal Article

Modal-space Theory: a Study of the Mineralogical Expression of Tholeiitic Compositions At T > 850 °c in the Lithosphere and Mantle Available to Purchase

Richard N. Abbott, Jr.
Published: 01 November 2016
The Canadian Mineralogist (2016) 54 (6): 1437–1457.
DOI: https://doi.org/10.3749/canmin.1600046
... NaAlSi 2 O 6 ) is subtracted from the bulk composition. This works because the composition of any plagioclase can be expressed as a linear combination of an 1/3 ab 2/3 and an . The residual bulk-rock chemistry (after subtracting an 1/3 ab 2/3 = csk 1/2 jd 1/2 ) is in the CMAS system (M = Fe 2+ + Mg + Mn...
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View PDF for article title, Modal-space Theory: a Study of the Mineralogical Expression of Tholeiitic Compositions At T &gt; 850 °c in the Lithosphere and Mantle
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Journal Article

Amorphous materials: Properties, structure, and durability: Structure of Mg- and Mg/Ca aluminosilicate glasses: 27 Al NMR and Raman spectroscopy investigations Available to Purchase

Daniel R. Neuville, Laurent Cormier, Valérie Montouillout, Pierre Florian, Francis Millot, Jean-Claude Rifflet, Dominique Massiot
Published: 01 November 2008
American Mineralogist (2008) 93 (11-12): 1721–1731.
DOI: https://doi.org/10.2138/am.2008.2867
...Daniel R. Neuville; Laurent Cormier; Valérie Montouillout; Pierre Florian; Francis Millot; Jean-Claude Rifflet; Dominique Massiot Abstract The structure and properties of glasses and melts in the MgO-Al 2 O 3 -SiO 2 (MAS) and CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) systems play an important role in Earth...
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View PDF for article title, Amorphous materials: Properties, structure, and durability: Structure of Mg- and Mg/Ca aluminosilicate glasses: 27 Al NMR and Raman spectroscopy investigations
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Journal Article

An Internally Consistent Thermodynamic Model for the System CaO-MgO-Al 2 O 3 -SiO 2 Derived Primarily from Phase Equilibrium Data Available to Purchase

Tibor Gasparik
Published: 01 January 2000
The Journal of Geology (2000) 108 (1): 103–119.
DOI: https://doi.org/10.1086/314389
...Figure 6. Pressure-composition phase diagram for the CMAS system showing the fit of the calculated isotherms (°C) to the experimentally determined alumina contents of orthopyroxene. Bars with circles are data from Gasparik ( 1984 c ); empty bars at 1 bar are data from Carlson ( 1989 ); empty...
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View PDF for article title, An Internally Consistent Thermodynamic Model for the <span class="search-highlight">System</span> CaO-MgO-Al 2 O 3 -SiO 2 Derived Primarily from Phase Equilibrium Data
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Journal Article

TEM investigation of forsterite dendrites Available to Purchase

François Faure, Gilles Trolliard, Bernard Soulestin
Published: 01 August 2003
American Mineralogist (2003) 88 (8-9): 1241–1250.
DOI: https://doi.org/10.2138/am-2003-8-907
... have been obtained by dynamic crystallization in the CaO–MgO-Al 2 O 3 -SiO 2 (CMAS) system in a one-atmosphere vertical furnace. A fast cooling rate (1890°C/h) has been used with degrees of undercooling varying from 156 to 356°C. Different microstructures were observed depending on their location...
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(a–j) BSE images of buffers and glasses produced in the series of CMAS glass experiments, from top to bottom: Ta (a and b), Nb (c and d), Cr (e and f), Mo (g and h), and W (i and j) buffers. For each experiment is shown an image of the buffer assembly (left) and the CMAS glass run product (right). The Ta, Nb, and W buffered experiments were carried out with a Mo outer capsule (a, c, and i, respectively) that helped to maintain the buffer assemblage for longer durations (see text for discussion). The Cr, Mo, and W experiments also produced a reaction product between MgO capsule and buffer materials—MgCr2O4, MgMoO4, and MgWO4 (e, g, and i, respectively; see text for discussion). Some of the CMAS glasses also contain plagioclase feldspar that is expected to be stable in the melt composition and P-T range (darker phase within the glass in b, f, and j). The presence of plagioclase does not affect the results of our series and the glasses produced in all experiments are within the range of compositions for CMAS systems glasses used by Sutton et al. (2005). All scale bars 10 µm.

( a–j ) BSE images of buffers and glasses produced in the series of CMAS gl... Available to Purchase

Published: 01 March 2023
, and j ). The presence of plagioclase does not affect the results of our series and the glasses produced in all experiments are within the range of compositions for CMAS systems glasses used by Sutton et al. (2005) . All scale bars 10 µm.
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The garnet-in curves experimentally determined for: pyroxenite GV10 (this study); MORB pyrolite (hMPY) modelled in the hydrous Cr–Ti-bearing system from Niida &amp; Green (1999); model Hawaiian peridotite nodule (PX) studied by Fumagalli &amp; Poli (2005); lherzolite in CMAS system by Klemme &amp; O’Neill (2000) and Walter et al. (2002). The blue dashed curve represents the garnet-in curve derived by thermodynamic calculations using Perple_X package (Connolly, 1990; Connolly &amp; Petrini, 2002), in the model chemical system Cr-NCFMAS.

The garnet-in curves experimentally determined for: pyroxenite GV10 (this s... Open Access

Published: 01 March 2018
Fig. 9 The garnet-in curves experimentally determined for: pyroxenite GV10 (this study); MORB pyrolite (hMPY) modelled in the hydrous Cr–Ti-bearing system from Niida & Green (1999) ; model Hawaiian peridotite nodule (PX) studied by Fumagalli & Poli (2005) ; lherzolite in CMAS system
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Comparison of experimental determinations of the model peridotite solidus in the CMAS system: LDEO (piston-in, barium carbonate pressure media = this study) vs. UTD (piston-out, talc/pyrex pressure media = Presnall et al. 1979; Walter and Presnall 1994; Milholland and Presnall 1998; Gudfinsson and Presnall 1996). The LDEO pressures are recalculated with the new regression equation described in the text.

Comparison of experimental determinations of the model peridotite solidus i... Available to Purchase

Published: 01 January 2005
F igure 8. Comparison of experimental determinations of the model peridotite solidus in the CMAS system: LDEO (piston-in, barium carbonate pressure media = this study) vs. UTD (piston-out, talc/pyrex pressure media = Presnall et al. 1979 ; Walter and Presnall 1994 ; Milholland and Presnall
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Pressure-composition phase diagram showing the comparison between the experimentally observed Ca contents of clinopyroxene in equilibrium with orthopyroxene in the CMAS system with the isotherms calculated using a model based on data from the enstatite-diopside join (Gasparik 1996). Temperatures are in °C. Sources: FU, Fujii 1977; GS, Sen 1985; NB, Nickel et al. 1985; PN, Perkins and Newton 1980; TG, Gasparik 1984c; WC, Carlson 1989; YT, Yamada and Takahashi 1984.

Pressure-composition phase diagram showing the comparison between the exper... Available to Purchase

Published: 01 January 2000
Figure 1. Pressure-composition phase diagram showing the comparison between the experimentally observed Ca contents of clinopyroxene in equilibrium with orthopyroxene in the CMAS system with the isotherms calculated using a model based on data from the enstatite-diopside join (Gasparik 1996
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The experimental uncertainty in the determination of the spinel-garnet peridotite boundary according to three recent studies (Walter et al. 2002 = WKKSNILF; Presnall et al. 2002 = PGW; and Klemme and O’Neill 2000 = KO) is illustrated for the CMAS system. This boundary plays a key role in our understanding of what material might constitute the lower oceanic lithosphere. Although not shown, Cr/Al ratio of the bulk peridotite can shift this boundary to higher pressures, stabilizing spinel to greater depths.

The experimental uncertainty in the determination of the spinel-garnet peri... Available to Purchase

Published: 01 May 2005
F igure 11. The experimental uncertainty in the determination of the spinel-garnet peridotite boundary according to three recent studies ( Walter et al. 2002 = WKKSNILF; Presnall et al. 2002 = PGW; and Klemme and O’Neill 2000 = KO) is illustrated for the CMAS system. This boundary plays
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CaO vs. Al2O3 showing compositions of melt inclusions in polyhedral, dendritic polyhedral, skeletal and dendritic forsterite produced experimentally in the CMAS system. Both CaO vs. Al2O3 are incompatible during forsterite growth. The initial melt composition is shown by the solid diamonds in the lower left, and the final quenched residual melts are shown by the gray diamonds. [Figure used by permission of Elsevier Limited from Faure and Schiano (2005), Earth Planet Sci Lett, Vol. 236, Fig. 4, p. 887.]

CaO vs. Al 2 O 3 showing compositions of melt inclusions in polyhedral, de... Available to Purchase

Published: 01 January 2008
Figure 4. CaO vs. Al 2 O 3 showing compositions of melt inclusions in polyhedral, dendritic polyhedral, skeletal and dendritic forsterite produced experimentally in the CMAS system. Both CaO vs. Al 2 O 3 are incompatible during forsterite growth. The initial melt composition is shown
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P-T estimates for sample DH101E. The results of two-pyroxene geothermometry are shown as lines TW and TT for the Wells (1977) and Taylor (1998) formulations, respectively. Pressures are limited by the stability of spinel, which, in the CMAS system, ranges from ~9 to 15 kbar at 900 °C. Extreme upper and lower limits are ~3 and 36 kbar at 900 °C, whereas a better estimate for the high-P stability of spinel in sample DH101E is ~21 kbar. For conditions of mineral equilibration in this sample, we have chosen a P-T of 20 kbar and 900 °C (gray circle).

P-T estimates for sample DH101E. The results of two-pyroxene geothermometr... Available to Purchase

Published: 01 January 2009
F igure 1. P-T estimates for sample DH101E. The results of two-pyroxene geothermometry are shown as lines TW and TT for the Wells (1977) and Taylor (1998) formulations, respectively. Pressures are limited by the stability of spinel, which, in the CMAS system, ranges from ~9 to 15 kbar
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Р–Т diagram for xenoliths of garnet-containing pyroxenites from the Sigurd Volcano basalts (1, 2 – Spl–Grt clinopyroxenites and websterites, respectively). Model continental geotherms with a surface heat flow density of 45, 50, 55, 60, 65, and 70 mW/m2 (3–8, respectively) and position of the mantle adiabat with a potential temperature of 1350 °C are given after Hasterock and Chapman (2011). The curve of phase transition of spinel lherzolites into garnet ones in the CMAS system (9) is given after Robinson and Wood (1998) and Walter et al. (2002), and the curve of the graphite→diamond phase transition (10), after Bundy et al. (1996).

Р–Т diagram for xenoliths of garnet-containing pyroxenites from the Sigurd... Available to Purchase

Published: 01 October 2022
) and position of the mantle adiabat with a potential temperature of 1350 °C are given after Hasterock and Chapman ( 2011 ). The curve of phase transition of spinel lherzolites into garnet ones in the CMAS system ( 9 ) is given after Robinson and Wood ( 1998 ) and Walter et al. ( 2002 ), and the curve
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Comparison of experimental determinations of the model peridotite solidus in the CMAS system: L-DEO (Lamont-Doherty Earth Observatory, piston-in, barium carbonate pressure media – this study, Table 3) vs. UTD (University of Texas at Dallas, piston-out, talc/pyrex pressure media = Presnall et al. 1979; Walter and Presnall 1994; Milholland and Presnall 1998; Gudfinsson and Presnall 1996). There is no friction correction for the UTD runs. Pressures of L-DEO experiments in this figure may be calculated from the ram pressure in Table 3 and following expression explained in the text: P = [Pram + 0.135]/0.904, where pressure is in GPa.

Comparison of experimental determinations of the model peridotite solidus i... Available to Purchase

Published: 01 January 2005
F igure 1. Comparison of experimental determinations of the model peridotite solidus in the CMAS system: L-DEO (Lamont-Doherty Earth Observatory, piston-in, barium carbonate pressure media – this study, Table 3 ) vs. UTD (University of Texas at Dallas, piston-out, talc/pyrex pressure media