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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 81, Issue 5-6

Issues

Modification of garnet by fluid infiltration during regional metamorphism in garnet through sillimanite-zone rocks, Dutchess County, New York

Donna L. Whitney
  • Department of Geology, University of North Carolina, Chapel Hill, North Carolina 27599, U.S.A.
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Trudy A. Mechum / Yildirim Dilek / Scott M. Kuehner
Published Online: 2015-11-13 | DOI: https://doi.org/10.2138/am-1996-5-617

Abstract

Metapelitic rocks from a progressive metamorphic sequence in Dutchess County, New York, record evidence for reaction between garnet and fluids associated with quartz (± plagioclase) veins and for net transfer among garnet interiors, mineral inclusions, and fluid. Garnet-fluid reaction resulted in modification of preexisting garnet textures, compositions, and growth-zoning patterns.

The textural and compositional record of garnet-fluid interaction varies with grade and with proximity of garnet to quartz veins. Garnet-zone rocks do not contain evidence for extensive reaction with vein-forming fluids. In upper staurolite- and kyanite-zone rocks, garnet that is crosscut by quartz veins contains a fluid-inclusion-filled region near the garnet-vein interface. This region truncates growth-zoning patterns and quartz inclusions. Fluid inclusions in garnet decrease in abundance away from quartz veins. In some rocks lacking quartz veins, fluid inclusions are concentrated in garnet interiors, and in particular near fractures, and are notably lacking around mineral inclusions in garnet.

Inferences from textural and compositional features combined with thermobarometric results indicate that preexisting garnet grains were modified at T≈ 525-550 °C and >4 kbar by one or more reactions involving fluids. The fluid pathways included foliationparallel channels in the rock as well as microcracks in mineral grains.

About the article

Received: 1995-04-10

Accepted: 1996-01-08

Published Online: 2015-11-13

Published in Print: 1996-05-01


Citation Information: American Mineralogist, Volume 81, Issue 5-6, Pages 696–705, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-1996-5-617.

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© 2015 by Walter de Gruyter Berlin/Boston.

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