Oxygen fugacity (fO2) is positively correlated with temperature (T) in silicate magma and often described as mineral assemblage buffer such as Fayalite-magnetite-quartz (FMQ), Ni-NiO(NNO), Hematite-magnetite (HM) oxygen buffer. My question is what are the most widely used function expressions between fO2 and T for FMQ, NNO and HM buffers and their references?
Hi Zhenggang:
I attach a multiple spreadsheet where you may find the functions you need to calculate fO2, T, and P for the most common oxygen fugacity used in petrology including the FMQ, NNO, and HM.
Good luck,
Xue-Ming
Hi Zhenggang:
I attach a multiple spreadsheet where you may find the functions you need to calculate fO2, T, and P for the most common oxygen fugacity used in petrology including the FMQ, NNO, and HM.
Good luck,
Xue-Ming
The most giving task would be to derive these relations yourself - using for example data from Robie and Waldbaum - USGS bulletin 1259.
Hi Antonella,
Check the reply to Zhenggang above, where you may find an Excel spreadsheet of how to calculate oxygen fugacity and convert to NNO+1 etc.
Regards,
Xue-Ming Yang
As per reference answer of Dr. Xue-Ming Yang , these sheets are most widely used calculations for mineral assemblage buffer such as Fayalite-magnetite-quartz (FMQ), Ni-NiO(NNO), Hematite-magnetite (HM) oxygen buffer.
Best of Luck
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