Crystallization Po2 of syenite porphyry from Navajo mountain, southern Utah

Kent C. Condie*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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 languageEnglish
Pages (from-to)359-362
Number of pages4
JournalBulletin of the Geological Society of America
Issue number4
Publication statusPublished - 1964
Externally publishedYes


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