Stable isotope geochemistry of silicon in granitoid zircon
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Stable isotope geochemistry of silicon in granitoid zircon. / Guitreau, Martin; Gannoun, Abdelmouhcine; Deng, Zhengbin; Chaussidon, Marc; Moynier, Frédéric; Barbarin, Bernard; Marin-Carbonne, Johanna.
In: Geochimica et Cosmochimica Acta, Vol. 316, 2022, p. 273-294.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Stable isotope geochemistry of silicon in granitoid zircon
AU - Guitreau, Martin
AU - Gannoun, Abdelmouhcine
AU - Deng, Zhengbin
AU - Chaussidon, Marc
AU - Moynier, Frédéric
AU - Barbarin, Bernard
AU - Marin-Carbonne, Johanna
N1 - Publisher Copyright: © 2021 Elsevier Ltd
PY - 2022
Y1 - 2022
N2 - Zircon is often used to study granites (sensu lato) and continental crust because it is very resistant and can be analyzed for various isotope systems that provide time and source information about their parental melts. Granites with different petrological histories have distinct bulk-rock silicon isotope compositions but it is unclear if these differences are also detectable in zircon because of superimposed fractionation effects (e.g., related to temperature, silica content, magmatic processes). The present study explores the Si isotope signatures of zircon from various granite types to constrain their isotope fractionation behavior and uses them as igneous petrogenetic tools, and possibly as granite source discriminators when zircon is found in detrital sediments. Our results show that although Si isotope compositions in zircon can be modified by secondary (post-crystallization) processes such as alteration/weathering and metamorphism, they are primarily controlled by zircon-melt isotope fractionation, which depends on both zircon crystallization temperature and magma silica content. Once these fractionation effects are understood and filtered out, a pattern emerges between Si isotope signatures of zircons from different granite types that is consistent with theoretical and experimental results as well as with known Si isotope differences at the bulk-rock scale. Silicon isotope ratios in zircon can track magma evolution (e.g., temperature and SiO2 changes) and, hence, reveal complex processes that involved magma mingling, fractional crystallization, and/or multiple sources. This study, therefore, illustrates that Si isotopes in zircon can be used to investigate magma evolution and represents a useful complement to existing techniques in granite studies involving zircon (e.g., U-Th-Pb, Lu-Hf and O isotopes) provided that it is not used as a stand-alone technique.
AB - Zircon is often used to study granites (sensu lato) and continental crust because it is very resistant and can be analyzed for various isotope systems that provide time and source information about their parental melts. Granites with different petrological histories have distinct bulk-rock silicon isotope compositions but it is unclear if these differences are also detectable in zircon because of superimposed fractionation effects (e.g., related to temperature, silica content, magmatic processes). The present study explores the Si isotope signatures of zircon from various granite types to constrain their isotope fractionation behavior and uses them as igneous petrogenetic tools, and possibly as granite source discriminators when zircon is found in detrital sediments. Our results show that although Si isotope compositions in zircon can be modified by secondary (post-crystallization) processes such as alteration/weathering and metamorphism, they are primarily controlled by zircon-melt isotope fractionation, which depends on both zircon crystallization temperature and magma silica content. Once these fractionation effects are understood and filtered out, a pattern emerges between Si isotope signatures of zircons from different granite types that is consistent with theoretical and experimental results as well as with known Si isotope differences at the bulk-rock scale. Silicon isotope ratios in zircon can track magma evolution (e.g., temperature and SiO2 changes) and, hence, reveal complex processes that involved magma mingling, fractional crystallization, and/or multiple sources. This study, therefore, illustrates that Si isotopes in zircon can be used to investigate magma evolution and represents a useful complement to existing techniques in granite studies involving zircon (e.g., U-Th-Pb, Lu-Hf and O isotopes) provided that it is not used as a stand-alone technique.
KW - Granite
KW - LA-MC-ICP-MS
KW - Si isotopes
KW - Zircon
U2 - 10.1016/j.gca.2021.09.029
DO - 10.1016/j.gca.2021.09.029
M3 - Journal article
AN - SCOPUS:85118363548
VL - 316
SP - 273
EP - 294
JO - Geochimica et Cosmochimica Acta. Supplement
JF - Geochimica et Cosmochimica Acta. Supplement
SN - 0046-564X
ER -
ID: 287063554