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Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy)

Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif,... American Mineralogist, Volume 93, pages 1519–1529, 2008 Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy) 1, 2 1, 1 Daniela Rubatto , * o thma R m üntene R, a uke b a Rnhoo Rn , † an D Cou Rtney GRe Go Ry Research School of Earth Sciences, The Australian National University, Canberra 0200 ACT, Australia Institute of Mineralogy and Geochemistry, University of Lausanne, CH-1015 Lausanne, Switzerland a bst Ra Ct An eclogite facies meta-plagiogranite from the Lanzo massif (western Alps, Italy) contains crystals of zircon intimately associated with allanite. Zircon displays different microtextures ranging from pristine, euhedral, and magmatic to fractured, porous varieties with mosaic zoning, and pervasive recrystallization into euhedral microcrystals. Fractures and voids in the recrystallized zircon microcrys- tals are mainly filled by high-pressure Na-rich pyroxene. Electron backscattered diffraction analysis revealed a similar crystallographic orientation for primary magmatic zircon crystals and microcrystals, with less than 2° misorientation among neighboring microdomains. The textural change is coupled with chemical and isotopic modifications: recrystallized zircon domains contain significantly less Th and light- to mid-REE, but are richer in Sr than magmatic zircon crystals. Magmatic zircon preserves the protolith U-Pb age of 163.5 ± 1.7 Ma, whereas http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png American Mineralogist de Gruyter

Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy)

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References (57)

Publisher
de Gruyter
Copyright
Copyright © 2011–2019 by Walter de Gruyter GmbH
ISSN
0003-004X
DOI
10.2138/am.2008.2874
Publisher site
See Article on Publisher Site

Abstract

American Mineralogist, Volume 93, pages 1519–1529, 2008 Dissolution-reprecipitation of zircon at low-temperature, high-pressure conditions (Lanzo Massif, Italy) 1, 2 1, 1 Daniela Rubatto , * o thma R m üntene R, a uke b a Rnhoo Rn , † an D Cou Rtney GRe Go Ry Research School of Earth Sciences, The Australian National University, Canberra 0200 ACT, Australia Institute of Mineralogy and Geochemistry, University of Lausanne, CH-1015 Lausanne, Switzerland a bst Ra Ct An eclogite facies meta-plagiogranite from the Lanzo massif (western Alps, Italy) contains crystals of zircon intimately associated with allanite. Zircon displays different microtextures ranging from pristine, euhedral, and magmatic to fractured, porous varieties with mosaic zoning, and pervasive recrystallization into euhedral microcrystals. Fractures and voids in the recrystallized zircon microcrys- tals are mainly filled by high-pressure Na-rich pyroxene. Electron backscattered diffraction analysis revealed a similar crystallographic orientation for primary magmatic zircon crystals and microcrystals, with less than 2° misorientation among neighboring microdomains. The textural change is coupled with chemical and isotopic modifications: recrystallized zircon domains contain significantly less Th and light- to mid-REE, but are richer in Sr than magmatic zircon crystals. Magmatic zircon preserves the protolith U-Pb age of 163.5 ± 1.7 Ma, whereas

Journal

American Mineralogistde Gruyter

Published: Oct 1, 2008

Keywords: U-Th-Pb geochronology

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