Thermodynamic properties of water-bearing magmas

Burnham, Charles W.; Davis, Nicholas F.

doi:10.1016/0031-9201(70)90071-3

Cited by 5 publications

(2 citation statements)

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“…This powder pattern is similar to those of phosphates of the wyllieite group. On the basis of the d-spacings shown in Table 3, which were calibrated with an internal standard of Pb(NO 3 ) 2 , the least-squares refinement program LCLSQ 8.4 (Burnham, 1991) has served to calculate the unit-cell parameters a = 11.824(2), b = 12.346(3), c = 6.293(1) Å, and β = 114.32(1)°.…”

Section: Powder X-ray Diffractionmentioning

confidence: 99%

Ferrorosemaryite, NaFe2+Fe3+Al(PO4)3, a new phosphate mineral from the Rubindi pegmatite, Rwanda

Hatert¹,

Lefèvre²,

Fransolet³

et al. 2005

ejm

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Among the four valid type-minerals reported in Rwanda, three were described in the Buranga pegmatite, which is host to over hundred of other mineral species (Daltry & Von Knorring, 1998). More than half of the recorded minerals from Buranga are phosphates, of which two compositional groups are recognised: Al-dominant and Fe-Mn-dominant phases (Von Knorring, 1970). Whereas the phosphate mineralogy of the Buranga pegmatite is relatively well known, detailed descriptions of phosphate mineral associations occurring in other granitic pegmatites from the Gatumba field are not really abundant. In order to complete the mineralogical description of these associations and to discuss their petrography, Lefèvre (2003) thoroughly investigated several samples collected in the Rubindi-Kabilizi pegmatites by A.-M. F., F.F. and P.K. in 1983. These samples contained aluminum phosphates, mostly montebrasite and scorzalite, with bertossaite, brazilianite, and trolleite.Embedded in a few scorzalite-rich samples from Rubindi, a dark green mineral was observed. A preliminary examination under the polarizing microscope and by powder X-ray diffraction indicated that this mineral belongs to the alluaudite or wyllieite group of minerals. The electron microprobe analyses indicated the presence of aluminium in significant amounts, thus confirming the identification of a wyllieite-type phosphate. The P2 1 /n space group of wyllieite was furthermore confirmed by Weissenberg photographs.This mineral corresponds to the Fe 2+ -rich equivalent of rosemaryite, i.e. I I NaFe 2+ Fe 3+ Al(PO 4 ) 3 , not yet described.

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Section: Powder X-ray Diffractionmentioning

confidence: 99%

Ferrorosemaryite, NaFe2+Fe3+Al(PO4)3, a new phosphate mineral from the Rubindi pegmatite, Rwanda

Hatert¹,

Lefèvre²,

Fransolet³

et al. 2005

ejm

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“…An external tectonic propagation mechanism cannot easily be invoked to explain the random and fine-scale nature of the microfractures. An internal process, such as the escape of volatiles from the consolidating magma, is more likely Burnham (1967) The amount of energy necessary to accomplish this type of fracturing by internal means would be enormous, and experimental work by Burnham and Davis (1969) on the system albite-water may be applicable to this problem. They assume that the system NaAlSi^Og-h^O is a reasonable model for water in felsic magmas, and then calculate that retrograde boiling and the increase in total volume, at least in simple melts, could be accompanied by a release of mechanical energy equivalent to that released during major volcanic eruptions (approximately 24 -3 10 ergs km of magma).…”

Section: Chemical Gains and Losses In Altered Igneous Rocksmentioning

confidence: 99%

Geology and porphyry copper-type alteration-mineralization of igneous rocks at the Christmas Mine, Gila County, Arizona

Koski¹

1979

Open-File Report

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The Christmas copper deposit, located in southern Gil a County, Arizona, is part of the major porphyry copper province of southwestern North America. Although Christmas is known for skarn deposits in Paleozoic carbonate rocks, ore-grade porphyry-type copper mineralization also occurs in a composite granodioritic intrusive complex and adjacent mafic volcanic country rocks. This study considers the nature, distribution, and genesis of alteration-mineralization in the igneous rock environment at Christmas.At the southeast end of the Dripping Spring Mountains, the Pennsylvanian Naco Limestone is unconformably overlain by the Creta-

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Thermodynamics of the Liquidus in the System Diopside—Water: A Review

Perchuk¹,

Kushiro²

1991

Advances in Physical Geochemistry

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Thermodynamic properties of water-bearing magmas

Cited by 5 publications

References 0 publications

Ferrorosemaryite, NaFe2+Fe3+Al(PO4)3, a new phosphate mineral from the Rubindi pegmatite, Rwanda

Ferrorosemaryite, NaFe2+Fe3+Al(PO4)3, a new phosphate mineral from the Rubindi pegmatite, Rwanda

Geology and porphyry copper-type alteration-mineralization of igneous rocks at the Christmas Mine, Gila County, Arizona

Thermodynamics of the Liquidus in the System Diopside—Water: A Review

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