Cooling History of Orthopyroxenes

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Science  18 Jul 1969:
Vol. 165, Issue 3890, pp. 285-287
DOI: 10.1126/science.165.3890.285


Order-disorder transitions between ferrous iron and magnesium in orthopyroxenes [minerals close to the composition (Fe, Mg) SiO3] occur rapidly between approximately 480° and 1000°C. Disordering and ordering have been studied experimentally. The determination of the metastable ferrous iron site occupancy in orthopyroxenes from rapidly cooled volcanic rocks provides information on the cooling rates, especially from 600° to 480°C.

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