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Dehydration reaction of titanoclinohumite: Reconnaissance to 30 kilobars

Merrill, R. B. and Robertson, J. K. and Wyllie, P. J. (1972) Dehydration reaction of titanoclinohumite: Reconnaissance to 30 kilobars. Earth and Planetary Science Letters, 14 (2). pp. 259-262. ISSN 0012-821X. doi:10.1016/0012-821X(72)90017-9.

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Natural titanoclinohumite was reacted in Pt capsules, using open air furnaces, hydrothermal and piston-cylinder apparatus. The reaction was not reversed, nor was it defined in terms of mineral products. Dehydration begins with the formation of forsterite at 950°C at 1 atm., 1150°C at 10 kbar, 1190°C at 20 kbar, and 1170°C at 30 kbar. Therefore, titanoclinohumite can exist as a hydrous mineral in the upper mantle. The reconnaissance results are consistent with the conclusion that titanoclinohumite coexisted with chrome-pyrope and olivine at the mantle source of the Moses Rock kimberlite; they make it unlikely that titanoclinohumite supplied water for the emplacement and eruption of the Moses Rock kimberlite through dehydration above 150 km but they do not preclude the possibility at greater depths.

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Additional Information:© 1972 Published by Elsevier B.V. Received 30 September 1971; Revised version received 5 January 1972. We thank Dr. P.H. Ribbe for supplying samples of titanoclinohumite, the National Science Foundation for grant GA-15718 and the Fannie and John Hertz Foundation for the fellowship held by R.B. Merrill.
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Fannie and John Hertz FoundationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20160122-124246553
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Official Citation:R.B. Merrill, J.K. Robertson, P.J. Wyllie, Dehydration reaction of titanoclinohumite: Reconnaissance to 30 kilobars, Earth and Planetary Science Letters, Volume 14, Issue 2, 1972, Pages 259-262, ISSN 0012-821X, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63900
Deposited By: Tony Diaz
Deposited On:22 Jan 2016 20:47
Last Modified:10 Nov 2021 23:23

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