A Caltech Library Service

Titanoclinohumite: A possible mineralogical site for water in the upper mantle

McGetchin, T. R. and Silver, L. T. and Chodos, A. A. (1970) Titanoclinohumite: A possible mineralogical site for water in the upper mantle. Journal of Geophysical Research, 75 (2). pp. 255-259. ISSN 0148-0227.

PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


Titanium-rich clinohumite and layered structure minerals are observed in kimberlite and as inclusions in pyropic garnets from the Moses Rock dike, a kimberlite-bearing breccia dike in San Juan County, Utah. Associated clinopyroxenes observed as inclusions within similar pyropes and also in kimberlite are estimated to have equilibrated at depths ranging from about 50 to 150 km at modest temperatures, generally less than 1000°C. The presence of titanoclinohumite, a high-density hydrous phase, is of considerable interest as a possible site for volatiles in the earth's upper mantle. The dehydration of hydrous phases such as titanoclinohumite within the upper mantle (1) may provide water as a free phase, (2) could be important in the genesis of kimberlite and alkali-basalt magma, and (3) may be one means of producing a low-velocity zone in the upper mantle.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright 1970 by the American Geophysical Union. (Received July 11, 1969.) Microprobe data were reduced with the help of Mrs. Lily Ray, with a computer program by A. L. Albee and A. E. Bence. The help of these individuals is gratefully acknowledged. This research was supported by a Penrose grant (1940-65) from the Geological Society of America and the U.S. Atomic Energy Commission, contract AT(04-3)-427, CALT-427-40. Contribution 1647, Division of Geological Sciences, California Institute of Technology.
Funding AgencyGrant Number
Geological Society of America Penrose Bequest Research Grants1940-65
Atomic Energy CommissionAT(04-3)-427
Subject Keywords:Geochemistry: Abundance Of Elements; Mantle: Composition; North America: Mineralogy
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences1647
Issue or Number:2
Record Number:CaltechAUTHORS:20141111-141125063
Persistent URL:
Official Citation:McGetchin, T. R., L. T. Silver, and A. A. Chodos (1970), Titanoclinohumite: A possible mineralogical site for water in the upper mantle, J. Geophys. Res., 75(2), 255–259, doi:10.1029/JB075i002p00255.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51595
Deposited By: George Porter
Deposited On:11 Nov 2014 22:22
Last Modified:03 Oct 2019 07:34

Repository Staff Only: item control page