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

Other| June 01, 1996 Modification of garnet by fluid infiltration during regional metamorphism in garnet through sillimanite-zone rocks, Dutchess County, New York Donna L. Whitney; Donna L. Whitney University of North Carolina, Department of Geology, Chapel Hill, NC, United States Search for other works by this author on: GSW Google Scholar Trudy A. Mechum; Trudy A. Mechum Search for other works by this author on: GSW Google Scholar Yildirim Dilek; Yildirim Dilek Search for other works by this author on: GSW Google Scholar Scott M. Kuehner Scott M. Kuehner Search for other works by this author on: GSW Google Scholar Author and Article Information Donna L. Whitney University of North Carolina, Department of Geology, Chapel Hill, NC, United States Trudy A. Mechum Yildirim Dilek Scott M. Kuehner Publisher: Mineralogical Society of America First Online: 02 Mar 2017 Online Issn: 1945-3027 Print Issn: 0003-004X Copyright © 1996 by the Mineralogical Society of America American Mineralogist (1996) 81 (5-6): 696–705. https://doi.org/10.2138/am-1996-5-617 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Donna L. Whitney, Trudy A. Mechum, Yildirim Dilek, Scott M. Kuehner; Modification of garnet by fluid infiltration during regional metamorphism in garnet through sillimanite-zone rocks, Dutchess County, New York. American Mineralogist 1996;; 81 (5-6): 696–705. doi: https://doi.org/10.2138/am-1996-5-617 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Metapelitic rocks from a progressive metamorphic sequence in Dutchess County, New York, record evidence for reaction between garnet and fluids associated with quartz (±pla-gioclase) 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. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.