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Hydrogen in spessartine-almandine garnets as a tracer of granitic pegmatite evolution

Arredondo, Elizabeth H. and Rossman, George R. and Lumpkin, Gregory R. (2001) Hydrogen in spessartine-almandine garnets as a tracer of granitic pegmatite evolution. American Mineralogist, 86 (4). pp. 485-490. ISSN 0003-004X.

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The hydroxide contents of spessartine-almandine garnets from the Rutherford no. 2 (Virginia), Himalaya (California), and George Ashley Block (California) pegmatites were determined by infrared spectroscopy. The hydroxide content of garnet increases from the wall zone to the core zone of the Rutherford no. 2 and Himalaya pegmatites, consistent with increasing H_2O activity during pegmatite crystallization. However, the absolute OH contents differ by about two orders of magnitude for these two suites of garnets, possibly due to the elevated Ca content of the Rutherford no. 2 and the differences in the depth of emplacement. The garnets from the George Ashley Block show significant excursions from this correlation at the positions within the pegmatite where Kleck and Foord (1999) identified disruptions in major- and minor-element trends that they associated with re-injections of magma and subsequent flushing of the dike system. Ease of measurement as well as a relative amplified sensitivity compared to the Mn and Fe trends, make hydrogen an excellent tracer for the evolution of granitic pegmatites.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 2001 Mineralogical Society of America. Manuscript Received May 23, 2000; Manuscript Accepted November 28, 2000. Manuscript handled by David London. This work was funded in part by National Science Foundation (USA) grant EAR-9804871. Wallace Kleck (Tehachapi, CA) provided the well-documented GAB samples and helpful review and discussions. William F. Larson (Fallbrook, CA) provided access to the Himalaya Mine for sample collection. David R. Bell was instrumental in initiating this study, and Elizabeth Johnson, George Morgan, Karen Webber, Klaus Langer, and David London provided through reviews and comments.
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Issue or Number:4
Record Number:CaltechAUTHORS:20130412-095814496
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Official Citation: Elizabeth H. Arredondo, George R. Rossman, and Gregory R. Lumpkin Hydrogen in spessartine-almandine garnets as a tracer of granitic pegmatite evolution American Mineralogist, April, v. 86, p. 485-490
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37904
Deposited By: Tony Diaz
Deposited On:16 Apr 2013 19:17
Last Modified:03 Oct 2019 04:52

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