crystal mush

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Journal Article
Published: 01 April 2017
American Mineralogist (2017) 102 (4): 766-776.
...Mattia Pistone; EIMF; Jon Blundy; EIMF; Richard A. Brooker; EIMF Abstract Many plutons preserve evidence of magma mixing between hydrous mafic magmas and resident felsic crystal-rich mushes. To investigate water transfer processes in such systems following thermal equilibration, we conducted 24 h...
FIGURES | View All (7)
Journal Article
Published: 01 March 2009
South African Journal of Geology (2009) 112 (1): 39-46.
... formed during late-stage infiltration of a more primitive magma into a nearly solidified crystal mush, with concomitant displacement of the last dregs of intercumulus melt. A solid-state origin for the texture appears untenable, as does derivation of the infiltrating melt from the underlying Platreef...
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Journal Article
Journal: Geology
Published: 01 September 1995
Geology (1995) 23 (9): 807-810.
... model. Low-T end-member magma is estimated by mass-balance calculation to be a crystal-rich mush of dacitic composition. These observations lead to a model wherein the highly crystallized remnant magma of the preceding activity has been mixed with the newly injected hot magma of similar bulk composition...
Journal Article
Published: 01 April 2004
The Canadian Mineralogist (2004) 42 (2): 371-392.
... and highly variable lithological structures, limited variation in Fo in the olivine and grain sizes suggest that the intrusion was formed by injection of high-yield-strength viscous crystal-mushes containing variable amounts of sulfide liquid and silicate melt of basaltic composition into planar fractures...
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Journal Article
Published: 01 October 2017
American Mineralogist (2017) 102 (10): 2007-2021.
...) macrocrysts with high-anorthite (An 84 –An 92 ) cores. Small microcrysts grew from their carrier liquid during the final phase of pre-eruptive crystallization while large macrocrysts, which are out of geochemical equilibrium with their carrier liquids, were entrained from crystal mushes. Changes in phase...
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Journal Article
Journal: Geology
Published: 01 September 2003
Geology (2003) 31 (9): 789-792.
... cooled to a rigid crystal mush before being partly remelted prior to eruption. Rejuvenation was triggered by intrusion of water-rich mafic magmas at the base of the Fish Canyon mush, but the mechanisms of heat transfer remain poorly understood. The growth of amphibole during reheating requires addition...
Log-time required to extract silicic melt from a <b>crystal</b> <b>mush</b> a function of...
Published: 01 April 2017
Figure 7 Log-time required to extract silicic melt from a crystal mush a function of crystal fraction (ϕ). The light and dark gray rectangles indicate the average residence times of crystal mushes (10 4 –10 5 years; Bachmann and Bergantz 2004 , and references therein) and those of long-lived
Model showing the evolution of the base of the KO Zone. A. A <b>crystal</b> <b>mush</b> o...
Published: 01 April 2004
F ig . 8. Model showing the evolution of the base of the KO Zone. A. A crystal mush of leucogabbroic composition forms the top of LG1. The second pulse of magma is sulfide-oversaturated and crystallizes olivine and pyroxene on top of LG1. B. Intercumulus melt enriched in PGE and volatile
Journal Article
Journal: Geology
Published: 01 August 2015
Geology (2015) 43 (8): 699-702.
...Mattia Pistone; Fabio Arzilli; Katherine J. Dobson; Benoît Cordonnier; Eric Reusser; Peter Ulmer; Federica Marone; Alan G. Whittington; Lucia Mancini; Julie L. Fife; Jonathan D. Blundy Abstract Gas-driven filter pressing is the process of melt expulsion from a volatile-saturated crystal mush...
Series: GSA Memoirs
Published: 01 January 1960
DOI: 10.1130/MEM80-p1
... in the crystal mush is at least 25 per cent by volume. The effect produced by this pore-space liquid is very much less than what would be expected; consequently it is postulated that diffusion from the pore-space liquid to the overlying main mass of magma and vice versa has tended to diminish the effect. When...
Phase maps of <b>crystal</b>-rich ignimbrites, both remobilized <b>crystal</b> <b>mushes</b> at ...
Published: 01 November 2016
Figure 10 Phase maps of crystal-rich ignimbrites, both remobilized crystal mushes at different stages of rejuvenation; the Masonic Park Tuff no longer has any sanidine and shows only tiny quartz microcrysts, whereas the Fish Canyon Tuff still shows large, albeit highly resorbed quartz
Journal Article
Published: 01 October 1963
American Mineralogist (1963) 48 (9-10): 1040-1069.
... is characterized by 1) fine- to coarse-grained textural layering roughly parallel to the borders, 2) large to small graphic granite crystals in a fine- to coarse-grained matrix, and 3) plumose muscovite-quartz intergrowths. The granite is considered to be emplaced as a liquid or in a crystal mush state and to have...
Journal Article
Journal: Geology
Published: 01 February 2012
Geology (2012) 40 (2): 115-118.
..., this dichotomy reflects the competition between two time scales: (1) a thermal reactivation time scale that measures the time necessary to make a locked crystal mush rheologically eruptible (<50% crystals), and (2) a homogenization time scale associated with convective stirring. Using a well-constrained...
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Journal Article
Published: 01 June 1981
Journal of the Geological Society (1981) 138 (3): 289-305.
... is normally graded (sharp mafic bases becoming more feldspathic upwards) and channel structures, some with breccias and extreme concentrations of mafic phases, are evidence of magmatic currents. Contorted bedding provides evidence of c. 15 m of crystal mush. In the chemically similar Klokken Laminated Syenite...
Journal Article
Journal: Economic Geology
Published: 01 May 2019
Economic Geology (2019) 114 (3): 569-590.
... curves suggest that the primary chromite texture was coarsened by a combination of adcumulus growth and textural equilibration, while compaction of the crystal mush played only a minor role. Mineral compositions were also modified by postcumulus processes, but because of the very high modal amount...
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(a) Mixing of olivine and plagioclase-rich <b>crystal</b> <b>mushes</b> (syn-magmatic def...
Published: 01 November 2007
Figure 4. (a) Mixing of olivine and plagioclase-rich crystal mushes (syn-magmatic deformation in laminated gabbro) at NM 46187 68838. (b) Boudinage in pyroxene-rich layer in the Sithean Mor laminated gabbro at NM 47181 67279. The plane of mineral lamination is parallel to the plane of deformed
Journal Article
Published: 01 June 2000
Mineralogical Magazine (2000) 64 (3): 481-496.
...-bearing fergusites constitute the outer shell of the magma chamber consisting of a highly viscous crystal mush with a melt content in the range 20–50 wt.%. The leucite/(clinopyroxene+olivine) modal ratio, varies with the extraction order of magmas from the chamber, decreasing upwards in the stratigraphic...
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Series: Society of Exploration Geophysicists Geophysical Monograph Series
Published: 01 January 1969
DOI: 10.5382/Mono.04.10
EISBN: 9781934969991
... is much smaller than in the stratiform deposits. The layered differentiates appear to have been re-emplaced into the crust as hot crystal mushes. During re-emplacement chromite was solid and relatively rigid compared to olivine, pyroxene, and plagioclase which, although also solid, yielded more or less...
Journal Article
Published: 01 March 2015
European Journal of Mineralogy (2015) 27 (2): 161-174.
... is the most recent (Eocene-Oligocene) volcanic distric within the Veneto Volcanic Province (VVP), which represents the main magmatic event in the eastern Southern Alps. The studied enclaves include intrusive and crystal mush types, the latter characterised by embayments of the host trachyte towards the core...
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Journal Article
Journal: GSA Bulletin
Published: 01 June 1978
GSA Bulletin (1978) 89 (6): 845-865.
... (“crystal-mush flow”) and consequently left little evidence of solid-state, penetrative deformation. If syntectonic and posttectonic magmatic sedimentation, crystal-mush flow, partial fusion of metamorphic peridotite, and multiple intrusion of magma act simultaneously during the formation of ophiolites...