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fayalite-bearing

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Journal Article
Journal: Geology
Published: 01 October 2012
Geology (2012) 40 (10): e277.
...J.D. Clemens; F. Finger Huang et al. suggest a reduced protolith for this granite, to stabilize fayalite. However, any f O 2 at or below the fayalite-magnetite-quartz (FMQ) buffer reaction would suffice. In this quartz-saturated, Mg-bearing system, forsterite solid solution in the olivine...
Journal Article
Journal: Geology
Published: 01 October 2012
Geology (2012) 40 (10): e278.
... of Clemens et al.’s data reveals that many relatively low-SiO 2 samples of the metasediment-derived fayalite-bearing Toombullup ignimbrite are weakly peraluminous, with a lowest ASI value of 1.0, comparable with the Jiuyishan rocks in the same SiO 2 range. REFERENCES CITED Anderson J.L...
Journal Article
Journal: Geology
Published: 01 October 2011
Geology (2011) 39 (10): 903-906.
...-rock geochemistry, Sr-Nd isotope, and in situ zircon Hf-O isotope results for a fayalite-bearing A-type granite suite at Jiuyishan in southern China. High zircon δ 18 O (8.0‰–9.8‰), negative zircon εHf(t) (–6.2 to –2.3), and evolved whole-rock Sr-Nd isotopes ( I Sr = 0.7151–0.7181; εNd(t) = –7.4...
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Journal Article
Published: 01 February 1997
The Canadian Mineralogist (1997) 35 (1): 119-133.
Journal Article
Published: 01 June 1961
American Mineralogist (1961) 46 (5-6): 747-748.
...Elbert A. King, Jr Abstract Fayalite has been reported from numerous localities throughout the world, and it is associated with quartz in some igneous rocks and in a few pegmatites (Shibata, 1937). Copyright © 1961 by the Mineralogical Society of America 1961 Mineralogical Society of America ...
Journal Article
Published: 01 December 1978
American Mineralogist (1978) 63 (11-12): 1116-1136.
... on fayalite-bearing assemblages from adjacent areas, permit estimates, based on experimental data, of temperature and pressure of metamorphism in the northeast Adirondacks. Absence of inverted pigeonite and compositions and distribution coefficients of coexisting augite and orthopyroxene suggest temperatures...
Journal Article
Published: 01 November 1961
Geological Magazine (1961) 98 (6): 473-482.
...M. O. Oyawoye Abstract A fayalite-bearing quartz monzonite rock occurring at Bauchi, northern Nigeria, is thought to be a part of the basement complex and considerably older than the fayalite-bearing granites in the ring-dike intrusive series of the Newer Granites. The rock is described in detail...
Journal Article
Published: 01 May 2015
American Mineralogist (2015) 100 (5-6): 1153-1164.
...-bearing lithophysae formed only in the core of the lava flow. Variations in the gas composition inside the lithophysae induced the oxidation of fayalite to a laihunite-1 M zone Fe 1 2+ Fe 2 3+ □ 1 (SiO 4 ) 2 . This zone is made of nano-lamellae of amorphous silica SiO 2 and laihunite-3 M Fe 2+ 1.6 Fe 3...
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Journal Article
Published: 01 August 1988
American Mineralogist (1988) 73 (7-8): 727-740.
..., if titanomagnetite or ilmenite is missing, QUI1F provides an estimate of a Fe 3 O 4 or a Fe 2 O 3 . The crystallization of a number of volcanic and plutonic rocks appears to have been controlled by the QUI1F equilibrium, with the oxide assemblages broadly reflecting the silica activity. Those fayalite-bearing rocks...
Journal Article
Published: 01 February 1998
The Canadian Mineralogist (1998) 36 (1): 147-162.
...Michael G. Rasmussen; Bernard W. Evans; Scott M. Kuehner Abstract At the Overlook gold mine in northeastern Washington, a fayalite-bearing assemblage of iron silicates, magnetite, and pyrrhotite, plus quartz and calcite, formed during alteration of a Permian volcanogenic, carbonate-rich, massive...
Journal Article
Published: 01 October 1950
American Mineralogist (1950) 35 (9-10): 877-881.
... nature but evidence is presented which seems to show that all are xenoliths, genetically related to a fayalite-bearing nordmarkite granite, older than and intruded by the dominant Rockport granite. * Contribution from the Department of Mineralogy and Petrography, Harvard University, No. 319...
Journal Article
Published: 01 August 1983
American Mineralogist (1983) 68 (7-8): 699-716.
... is restricted within a narrow range of f O 2 in fayalite-bearing systems. Because of the compositional limit ( X Fe Ol > 0.8) of olivine in iron-formations, an upper f O 2 limit for olivine may be set. At the same P and T , orthopyroxene is stable at higher f O 2 conditions than olivine. Consequently...
Journal Article
Published: 01 October 2016
Mineralogical Magazine (2016) 80 (6): 1067-1076.
..., kuratite coexisting with Al, Ti-bearing hedenbergite, ulvöspinel, iron-sulfide, tsangpoite, Ca-rich fayalite and kirschsteinite in D'Orbigny angrite most probably was formed at >1000°C by rapid cooling of an interstitial melt, which is subsilicic, almost Mg-free but enriched in Al-P-Ca-Ti-Fe. Abstract...
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Journal Article
Journal: Economic Geology
Published: 01 July 1979
Economic Geology (1979) 74 (4): 775-785.
... which will not produce the assemblage quartz-magnetite-fayalite (or quartz-magnetite-ferrohypersthene for Mg-bearing systems) at the highest grades of metamorphism are hematite-siderite + or - magnetite, where hematite exceeds siderite in abundance, and hematite-quartz + or - magnetite. It also...
Journal Article
Published: 01 April 2007
American Mineralogist (2007) 92 (4): 699-702.
... transition and the Schottky anomaly, all fayalite-bearing olivines show a region of positive Δ C P xs at low temperatures with maxima at the Neel temperatures, T N , and a maximal value of ~10 J/(mol·K) for Fo 10 Fa 90 (Fig. 2a ). Magnesium-rich compositions are characterized by having a smaller...
FIGURES
Journal Article
Published: 01 April 2019
Mineralogical Magazine (2019) 83 (2): 293-313.
...–Ti-bearing hedenbergite + fayalite–kirschsteinite intergrowth, the formation of tsangpoite and matyhite, along with kuratite (the Fe-analogue of rhönite), can be readily rationalised as crystallisation from residue magmas at the final stage of the D’Orbigny meteorite formation. Alternatively...
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Journal Article
Published: 01 October 2000
The Canadian Mineralogist (2000) 38 (5): 1103-1124.
.... Les métacherts contiennent un faciès à dominance de silicates de fer (avec quartz, fayalite, ferrosilite, pyrrhotite, magnétite, annite, grunerite), avec intercalations subordonnées de calc-silicates (avec calcite, dolomite, sidérite, diopside, trémolite, fayalite, quartz), ce qui fait penser...
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Journal Article
Journal: Economic Geology
Published: 01 August 1998
Economic Geology (1998) 93 (5): 564-586.
...David M. Borrok; Stephen E. Kelser; Rudolf H. Boer; Eric J. Essene Abstract Vergenoeg is a fluorite-bearing massive iron oxide deposit that is genetically related to granites of the Bushveld Complex. It consists of a pipe-shaped body containing primary fayalite, fluorite, apatite, ilmenite...
Journal Article
Published: 01 June 2000
Mineralogical Magazine (2000) 64 (3): 525-537.
... their crystallization from magmas of the same composition. However, the presence of quartz and fayalite in T1 and of pure aegirine in T2 and the occurrence of Zr-bearing aegirine (NaZr 0.5 Fe 2+ 0.5 Si 2 O 6 ) in the early crystallizing alkaline syenites evolving towards pure aegirine from medium- to fine-grained...
FIGURES
Series: Special Publications of the Society of Economic Geologists
Published: 01 January 2005
DOI: 10.5382/SP.10.15
EISBN: 9781629490342
... compositions in log ƒ S 2 − 1,000/T, R H − 1,000/T, and R S − 1,000/T diagrams, where R H ≈ log (X H 2 /X H 2 O ), R S ≈ log (X H 2 /X H 2 O ), and X = mole fraction of the gas. Oxidation states of andesitic arc magmas plot in a tight cluster between fayalite + magnetite + quartz and pyrrhotite...
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