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Science 18 July 1969:
Vol. 165. no. 3890, pp. 285 - 287
DOI: 10.1126/science.165.3890.285
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Articles

Cooling History of Orthopyroxenes

Stefan S. Hafner 1 and David Virgo 1

1 Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637

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.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Mossbauer Spectrometry of Lunar Samples.
C. L. Herzenberg, C. L. Herzenberg, and D. L. Riley (1970)
Science 167, 683-686
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Mossbauer Effect and High-Voltage Electron Microscopy of Pyroxenes in Type B Samples.
H. Fernandez-Moran, H. Fernandez-Moran, S. S. Hafner, M. Ohtsuki, and D. Virgo (1970)
Science 167, 686-688
   Abstract »    PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)