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A rare garnet-tourmaline-sillimanite-biotite-ilmenite-quartz assemblage from the granulite-facies region of south-central Massachusetts
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Jennifer A. Thomson
Published/Copyright:
March 31, 2015
Abstract
A rare lithology consisting of garnet-tourmaline-sillimanite-biotite-ilmenite-quartz has been found within the granulite-facies region of south-central Massachusetts. The homogeneous, Ti-rich oxy-dravitic tourmaline, XMg = Mg/(Mg + Fe) = 0.72.0.77, falls into the alkali group, and is similar in composition to lower grade tourmaline found in corresponding metapelitic rocks in Maine. Charge-balancing calculations and binary diagrams suggest that, like biotite in the region, tourmaline has undergone deprotonation by means of the exchange vectors AlOR-1(OH)-1 and TiO2R-1(OH)-2, where R represents Fe + Mg. The restriction of a concordant tourmaline-rich horizon in otherwise tourmaline-free rocks of this granulite-facies region suggests that either: (1) B, released during prograde fluid-absent dehydration reactions of muscovite and biotite, was locally available in a fluid phase or melt for later crystallization near the peak of granulite-facies metamorphism along pathways that provided a conduit for fluid migration; or (2) that this is simply a B-rich compositional horizon (tourmalinite) that survived anatexis and granulite-facies metamorphism and that records the incipient conditions of tourmaline breakdown and subsequent recrystallization near or post-peak metamorphism.
Received: 0200-2-7
Accepted: 2006-5-3
Published Online: 2015-3-31
Published in Print: 2006-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Massachusetts;
tourmaline;
granulite-facies;
partial melting;
deprotonation
Articles in the same Issue
- Presidential Address to the Mineralogical Society of America, Salt Lake City, October 18, 2005: Mineral surfaces and the prebiotic selection and organization of biomolecules
- A rare garnet-tourmaline-sillimanite-biotite-ilmenite-quartz assemblage from the granulite-facies region of south-central Massachusetts
- Effects of natural radiation damage on back-scattered electron images of single crystals of minerals
- Thermal diffusivity of olivine-group minerals at high temperature
- Quantum mechanical vs. empirical potential modeling of uranium dioxide (UO2) surfaces: (111), (110), and (100)
- AXANES study of Cu speciation in high-temperature brines using synthetic fluid inclusions
- A new approach to determine and quantify structural units in silicate glasses using micro-reflectance Fourier-Transform infrared spectroscopy
- Titanium incorporation and VITi3+ -IVTi4+ charge transfer in synthetic diopside
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- Letter. Crystallographic alignments in a coccolith (Pleurochrysis carterae) revealed by electron back-scattered diffraction (EBSD)
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