Crystallization Po2 of syenite porphyry from Navajo mountain, southern Utah

Kent C. Condie

doi:10.1130/0016-7606(1964)75[359:CPOSPF]2.0.CO;2

Crystallization Po2 of syenite porphyry from Navajo mountain, southern Utah

Kent C. Condie^*

^*Corresponding author for this work

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

Recent mapping in the Navajo Mountain region of southern Utah revealed the presence of a small syenite porphyry intrusion on the southwest part of Navajo Mountain. The presence of euhedral hematite crystals which appear to have crystallized directly from the magma suggests a means of estimating the crystallization Po₂, At 500-600°C a Po₂ equal to or greater than 10^-13 to 10^-17 atms would be necessary for hematite to be the equilibrium iron oxide phase. It is suggested that intrusion at a shallow depth may be partly responsible for the oxidizing environment that existed during crystallization.

Original language	English
Pages (from-to)	359-362
Number of pages	4
Journal	Bulletin of the Geological Society of America
Volume	75
Issue number	4
DOIs	https://doi.org/10.1130/0016-7606(1964)75[359:CPOSPF]2.0.CO;2
Publication status	Published - 1964
Externally published	Yes

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Condie, K. C. (1964). Crystallization Po2 of syenite porphyry from Navajo mountain, southern Utah. Bulletin of the Geological Society of America, 75(4), 359-362. https://doi.org/10.1130/0016-7606(1964)75[359:CPOSPF]2.0.CO;2

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abstract = "Recent mapping in the Navajo Mountain region of southern Utah revealed the presence of a small syenite porphyry intrusion on the southwest part of Navajo Mountain. The presence of euhedral hematite crystals which appear to have crystallized directly from the magma suggests a means of estimating the crystallization Po2, At 500-600°C a Po2 equal to or greater than 10-13 to 10-17 atms would be necessary for hematite to be the equilibrium iron oxide phase. It is suggested that intrusion at a shallow depth may be partly responsible for the oxidizing environment that existed during crystallization.",

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AU - Condie, Kent C.

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AB - Recent mapping in the Navajo Mountain region of southern Utah revealed the presence of a small syenite porphyry intrusion on the southwest part of Navajo Mountain. The presence of euhedral hematite crystals which appear to have crystallized directly from the magma suggests a means of estimating the crystallization Po2, At 500-600°C a Po2 equal to or greater than 10-13 to 10-17 atms would be necessary for hematite to be the equilibrium iron oxide phase. It is suggested that intrusion at a shallow depth may be partly responsible for the oxidizing environment that existed during crystallization.

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DO - 10.1130/0016-7606(1964)75[359:CPOSPF]2.0.CO;2

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10.1130/0016-7606(1964)75[359:CPOSPF]2.0.CO;2

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