Water loss during dynamic recrystallization of Moine thrust quartzites, northwest Scotland

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dc.contributor.authorKronenberg, Andreas K.en
dc.contributor.authorAshley, Kyle T.en
dc.contributor.authorFrancsis, Matthew K.en
dc.contributor.authorHolyoke, Caleb W.en
dc.contributor.authorJezek, Lynnaen
dc.contributor.authorKronenberg, Johannes A.en
dc.contributor.authorLaw, Richard D.en
dc.contributor.authorThomas, Jay B.en
dc.contributor.departmentGeosciencesen
dc.date.accessioned2020-12-22T20:11:31Zen
dc.date.available2020-12-22T20:11:31Zen
dc.date.issued2020-06en
dc.description.abstractInfrared absorption measurements of molecular water in sheared Cambrian quartzites in the footwall to the Moine thrust reveal a decrease in water content from 4080 to 1570 ppm with increasing recrystallization traced toward the overlying thrust at the Stack of Glencoul in northwest Scotland. These results are contrary to the expected correlation between shear strain and water content for quartz deformed by dislocation creep and water-weakening processes. The observed inverse correlation indicates that fluid inclusions and hydrous defects within grains were lost by mobile grain boundary sweeping and grain boundary diffusion. Although reduced water contents might lead to hardening as chemical weakening is diminished, quartz mylonites in the immediate footwall (5 mm) to the thrust are characterized by intense strain localization and contain the least water, and there is little evidence of shear zone widening. Water weakening appears to have been important throughout the quartz mylonites, controlled by the presence of water, not by water concentration. Fluids present within relict inclusions and at grain boundaries may have governed the high water fugacities critical for water weakening.en
dc.description.notesThis study benefited from helpful and enjoyable discussions over the years with Holger Stunitz, Rudiger Kilian, Jan Tullis, Stephen Kirby, Robert Tracy, Renee Heilbronner, Whitney Behr, Sven Morgan, William Carlson, Sharon Mosher, and Mervyn Paterson. Our statistical treatment of data benefited from the suggestions of Rick Carlson. We acknowledge the insights and comments made by reviewers Roberto Weinberg and Hugues Raimbourg, which improved this paper. The U.S. National Science Foundation (NSF) funded this work through a collaborative research grant awarded to the principal investigators at Virginia Tech (Blacksburg, Virginia, USA) (NSF EAR-1220345), Texas A&M University (College Station, Texas) (NSF EAR-1220138), and Rensselaer Polytechnic Institute (Troy, New York) (transferred to Syracuse University (New York), NSF EAR-1543627); their support is gratefully acknowledged.en
dc.description.sponsorshipU.S. National Science Foundation (NSF)National Science Foundation (NSF) [NSF EAR-1220345]; Texas A&M University (College Station, Texas) [NSF EAR-1220138]; Rensselaer Polytechnic Institute (Troy, New York) [NSF EAR-1543627]en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1130/G47041.1en
dc.identifier.eissn1943-2682en
dc.identifier.issn0091-7613en
dc.identifier.issue6en
dc.identifier.urihttp://hdl.handle.net/10919/101582en
dc.identifier.volume48en
dc.language.isoenen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleWater loss during dynamic recrystallization of Moine thrust quartzites, northwest Scotlanden
dc.title.serialGeologyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.dcmitypeStillImageen

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