High-temperature stability of San Carlos olivine

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Authors:Kohlstedt, D. L.; Mackwell, S. J.
Author Affiliations:Primary:
Cornell Univ., Ithaca, Dep. Mater. Sci. Eng., Ithaca, NY 14853, United States
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 95(2), p.226-230. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1987
Note:In English. 12 refs.; illus. incl. 1 table
Summary:A suite of heat-treatment experiments was performed to test the high-T stability of olivine from San Carlos, Arizona, within the theoretical PO2 stability field at 1 atm total P. Exsolution or contamination products did not form on the surface of samples which were surrounded by olivine, magnesia or alumina. In contrast, Sr-rich phases developed on the surfaces of samples which were in line-of-sight contact with Si or Pt. These Si-rich phases result from interaction of the olivine with Si or Pt in the furnace environment, via vapour phase transport or surface diffusion, rather than from diffusion of excess silica from the bulk to the surface, as suggested by earlier workers. This conclusion is consistent with the reported slow rate of diffusion of Si in olivine and with the lack of internal precipitation of Si-rich phases. It is concluded that San Carlos olivine does not contain Si in excess of the solubility limit under conditions within the PO2-T stability field for this (Mg,Fe,Ni)-olivine. [P.Br.]
Subjects:Experimental studies; High temperature; Mineralogy; Minerals; Nesosilicates; Olivine group; Orthosilicates; Silicates; Stability; Temperature; Arizona; United States; San Carlos
Abstract Numbers:87M/4224
Record ID:1988002663
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from Geoline, Bundesanstalt fur Geowissenschaften und Rohstoffe
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