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Journal of Petrology Advance Access originally published online on August 2, 2008
Journal of Petrology 2008 49(9):1579-1588; doi:10.1093/petrology/egn038
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

The Formation of Micro-Rodingites from IODP Hole U1309D: Key To Understanding the Process of Serpentinization

B. Ronald Frost1,*, James S. Beard2, Andrew McCaig3 and Eric Condliffe3

1Department of Geology and Geophysics, University of Wyoming, Laramie, WY 82071, USA
2Virginia Museum of Natural History, 21 Starling Avenue, Martinsville, VA 24112, USA
3School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK

RECEIVED JANUARY 31, 2008; ACCEPTED JULY 9, 2008


  Abstract

Olivine-rich troctolites of Integrated Ocean Drilling Program hole U1309D contain abundant veins along which the olivine has been serpentinized. Where the serpentinite veins cut plagioclase the plagioclase has been altered to prehnite and in many places the prehnite in the core of the vein has been altered to grossular. We show that these Ca-rich assemblages, which we call micro-rodingites, need not have formed by Ca-metasomatism. Instead the micro-rodingites could have occurred during serpentinization as a nearly closed-system process (apart from the addition of water and release of H2 and Na+). We argue that in these rocks the alteration of plagioclase occurred as a result of the very low silica activity that accompanies serpentinization. The reaction of plagioclase to prehnite and prehnite to grossular provided a source of SiO2 that allowed olivine to hydrate to serpentine without producing much brucite. Excess Al2O3 produced by the alteration of plagioclase reacted with serpentine to produce chlorite and additional SiO2.

KEY WORDS: serpentinization; rodingite; Integrated Ocean Drilling Program Expeditions 304 and 304; IODP hole U1309D; ocean floor metamorphism; silica activity

*Corresponding author. Telephone: 307-766-4290. Fax: 307-766-6679. E-mail: rfrost{at}uwyo.edu


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