The stability of sodalite in the system NaAlSiO4-NaCl

Sharp, Zachary D.; Helffrich, George; Bohlen, Steven R.; Essene, Eric J.

doi:10.1016/0016-7037(89)90315-3

Cited by 65 publications

(35 citation statements)

References 43 publications

(24 reference statements)

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“…Thermodynamic data for analcime and sodalite were taken from Sharp et al (1989) and Johnson et al (1992). End-member component activities from mineral formulae were calculated using the solution model of Fuhrman and Lindsley (1988) for feldspar and the model of Holland (1990) for clinopyroxene.…”

Section: Methods Of Calculationmentioning

confidence: 99%

Ilímaussaq ‘en miniature’: closed-system fractionation in an agpaitic dyke rock from the Gardar Province, South Greenland (contribution to the mineralogy of Ilímaussaq no. 117)

Marks

Markl

2003

Mineral. mag.

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Based on petrography, mineral chemistry, and petrology, the physico-chemical evolution of an agpaitic dyke was found to be very similar to that of the neighbouring Ilṍmaussaq complex. Various mineral assemblages were used to reconstruct the crystallization conditions of the dyke rock for different stages during cooling. The early magmatic phenocryst assemblage is alkali feldspar + nepheline + augite + olivine + magnetite and indicates liquidus temperatures of~850ºC, silica activities of~0.5, and oxygen fugacities of FMQ -1.5 to -3. The groundmass assemblage albite + microcline + nepheline + sodalite + arfvedsonite + aegirine + aenigmatite + astrophyllite indicates lower temperatures of between 600 and 450ºC, at silica activities of 0.25, and oxygen fugacities around the FMQ buffer. Amphibole composition strongly responds to fluorite saturation and proves crystallization occurred in a system closed to oxygen. Late-stage hydrothermal conditions are indicated by the conversion of nepheline and sodalite to analcime and the growth of aegirine on arfvedsonite. These late-stage reactions are constrained to temperatures of <300ºC, water activities of between 0.5 and unity, and oxygen fugacities above MH. The dyke has to be regarded as a small equivalent of the larger Ilṍmaussaq complex, in which identical differentiation processes proceeded at a scale very different in terms of magma volume and cooling times.

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Section: Methods Of Calculationmentioning

confidence: 99%

Ilímaussaq ‘en miniature’: closed-system fractionation in an agpaitic dyke rock from the Gardar Province, South Greenland (contribution to the mineralogy of Ilímaussaq no. 117)

Marks

Markl

2003

Mineral. mag.

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“…[3][4][5][6], and many others]. Structural studies of sodalite-group minerals from the Somma-Vesuvius volcanic complex were reported by Balassone et al [6].…”

Section: Introductionmentioning

confidence: 94%

“…The photoluminescence and excitation spectra of sodalities from Greenland, Canada and China were recorded by Sidike et al [7] who determined fine structures on emission bands at low temperatures. Sharp et al [4] made comprehensive studies of sodalite stability in the NaAlSiO 4 -NaCl system. A synthesis of sodalite from kaolinite-rich clay was made by Reyes et al [8].…”

Section: Introductionmentioning

confidence: 99%

The transformation of nepheline and albite into sodalite in pegmatitic mariupolite of the Oktiabrski Massif (SE Ukraine)

Dumańska-Słowik

Heflik

Pieczka

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…5). At about 700°C, hydroxy sodalite starts decomposing to a-carnegieite which further transforms into the denser polymorph nepheline (NaAlSiO 4 ), a porous tectosilicate system without the zeolitic water or the non-tetrahedral anions [33]. Any traces of sodalite are hardly visible by 900°C, where it has completely decomposed to nepheline [34].…”

Section: Thermostability Of Hydroxy Sodalitementioning

confidence: 99%