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 |
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Pages (from-to) | 359-362 |
Number of pages | 4 |
Journal | Bulletin of the Geological Society of America |
Volume | 75 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1964 |
Externally published | Yes |