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Dating Metasomatism: Monazite and Zircon Growth during Amphibolite Facies Albitization
dc.contributor.author | Condit, Cailey B. | |
dc.contributor.author | Mahan, Kevin H. | |
dc.contributor.author | Curtis, Kelly C. | |
dc.contributor.author | Moller, Andreas | |
dc.date.accessioned | 2019-11-18T15:36:50Z | |
dc.date.available | 2019-11-18T15:36:50Z | |
dc.date.issued | 2018-04-29 | |
dc.identifier.citation | Condit, C.B.; Mahan, K.H.; Curtis, K.C.; Möller, A. Dating Metasomatism: Monazite and Zircon Growth during Amphibolite Facies Albitization. Minerals 2018, 8, 187. | en_US |
dc.identifier.uri | http://hdl.handle.net/1808/29788 | |
dc.description.abstract | We present coupled textural observations and trace element and geochronological data from metasomatic monazite and zircon, to constrain the timing of high-grade Na-metasomatism (albitization) of an Archean orthogneiss in southwest Montana, USA. Field, mineral textures, and geochemical evidence indicate albitization occurred as a rind along the margin of a ~3.2 Ga granodioritic orthogneiss (Pl + Hbl + Kfs + Qz + Bt + Zrn) exposed in the Northern Madison range. The metasomatic product is a weakly deformed albitite (Ab + Bt + OAm + Zrn + Mnz + Ap + Rt). Orthoamphibole and biotite grew synkinematically with the regional foliation fabric, which developed during metamorphism that locally peaked at upper amphibolite-facies during the 1800–1710 Ma Big Sky orogeny. Metasomatism resulted in an increase in Na, a decrease in Ca, K, Ba, Fe, and Sr, a complete transformation of plagioclase and K-feldspar into albite, and loss of quartz. In situ geochronology on zoned monazite and zircon indicate growth by dissolution–precipitation in both phases at ~1750–1735 Ma. Trace element geochemistry of rim domains in these phases are best explained by dissolution–reprecipitation in equilibrium with Na-rich fluid. Together, these data temporally and mechanistically link metasomatism with high-grade tectonism and prograde metamorphism during the Big Sky orogeny. | en_US |
dc.description.sponsorship | Funding for this work was provided by NSF grant (EAR1252295) to Mahan | en_US |
dc.publisher | MDPI | en_US |
dc.rights | © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | en_US |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_US |
dc.subject | metasomatism | en_US |
dc.subject | albitization | en_US |
dc.subject | geochronology | en_US |
dc.subject | trace element geochemistry | en_US |
dc.subject | monazite | en_US |
dc.subject | zircon | en_US |
dc.subject | SW Montana | en_US |
dc.title | Dating Metasomatism: Monazite and Zircon Growth during Amphibolite Facies Albitization | en_US |
dc.type | Article | en_US |
kusw.kuauthor | Moller, Andreas | |
kusw.kudepartment | Geology | en_US |
dc.identifier.doi | 10.3390/min8050187 | en_US |
dc.identifier.orcid | https://orcid.org/0000-0001-7392-7681 | en_US |
dc.identifier.orcid | https://orcid.org/0000-0001-6858-2498 | en_US |
kusw.oaversion | Scholarly/refereed, author accepted manuscript | en_US |
kusw.oapolicy | This item meets KU Open Access policy criteria. | en_US |
dc.rights.accessrights | openAccess | en_US |
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Except where otherwise noted, this item's license is described as: © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access
article distributed under the terms and conditions of the Creative Commons Attribution
(CC BY) license (http://creativecommons.org/licenses/by/4.0/).