Preferential dissolution of uranium-rich zircon can bias the hafnium isotope compositions of granites

Hafnium (Hf) isotopes in zircon are important tracers of granite petrogenesis and continental crust evolution. However, zircon in granites generally shows large Hf isotope variations, and the reasons for this are debated. We applied U-Pb geochronology, trace-element, and Hf isotope analyses of zirco...

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Published in:Geology (Boulder) 2022-03, Vol.50 (3), p.336-340
Main Authors: Gao Peng, Gao Peng, Yakymchuk, Chris, Zhang Jian, Zhang Jian, Yin Changqing, Yin Changqing, Qian Jiahui, Qian Jiahui, Li Yanguang, Li Yanguang
Format: Article
Language:English
Subjects:
absolute age
Archives & records
Asia
Cenozoic
chemical composition
China
Continental crust
Dissolution
Dissolving
Far East
Geochronology
Geochronometry
Geology
Granite
granites
Hafnium
Hafnium isotopes
Heredity
Hf-177/Hf-176
High temperature
Himalayas
igneous and metamorphic rocks
igneous rocks
intrusions
Isotope composition
Isotope ratios
Isotopes
Low temperature
Melting
metals
Miocene
Nariyongcuo Pluton
Neogene
nesosilicates
orthosilicates
Petrogenesis
Petrology
plutonic rocks
plutons
Radiation
Radiation damage
Radiometric dating
Saturation
silicates
solution
stable isotopes
temperature
Tertiary
Trace elements
Tracers
U/Pb
Uranium
Xizang China
Zircon
zircon group
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creator Gao Peng, Gao Peng
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Zhang Jian, Zhang Jian
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Qian Jiahui, Qian Jiahui
Li Yanguang, Li Yanguang
description Hafnium (Hf) isotopes in zircon are important tracers of granite petrogenesis and continental crust evolution. However, zircon in granites generally shows large Hf isotope variations, and the reasons for this are debated. We applied U-Pb geochronology, trace-element, and Hf isotope analyses of zircon from the Miocene Himalayan granites to address this issue. Autocrystic zircon had εHf values (at 20 Ma) of -12.0 to -4.3 (median=-9). Inherited zircon yielded εHf values (at 20 Ma) of -34.8 to +0.3 (median=-13); the majority of εHf values were lower than those of autocrystic zircon. The εHf values of inherited zircon with high U concentrations resembled those of autocrystic zircon. Geochemical data indicates that the granites were generated during relatively low-temperature (
doi_str_mv 10.1130/G49656.1
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However, zircon in granites generally shows large Hf isotope variations, and the reasons for this are debated. We applied U-Pb geochronology, trace-element, and Hf isotope analyses of zircon from the Miocene Himalayan granites to address this issue. Autocrystic zircon had εHf values (at 20 Ma) of -12.0 to -4.3 (median=-9). Inherited zircon yielded εHf values (at 20 Ma) of -34.8 to +0.3 (median=-13); the majority of εHf values were lower than those of autocrystic zircon. The εHf values of inherited zircon with high U concentrations resembled those of autocrystic zircon. Geochemical data indicates that the granites were generated during relatively low-temperature (&lt;800°C) partial melting of metasedimentary rocks, which, coupled with kinetic hindrance, may have led to the preferential dissolution of high-U zircon that could dissolve more efficiently into anatectic melt due to higher amounts of radiation damage. Consequently, Hf values of autocrystic zircon can be biased toward the values of U-rich zircon in the source. By contrast, literature data indicate that granites generated at high temperatures (&lt;820-850°C) generally contain autocrystic and inherited zircons with comparable Hf isotope values. During higher-temperature melting, indiscriminate dissolution of source zircon until saturation is reached will result in near-complete inheritance of Hf isotope ratios from the source. Our results impose an extra layer of complexity to interpretation of the zircon Hf isotope archive that is not currently considered.</description><identifier>ISSN: 0091-7613</identifier><identifier>EISSN: 1943-2682</identifier><identifier>DOI: 10.1130/G49656.1</identifier><language>eng</language><publisher>Boulder: Geological Society of America (GSA)</publisher><subject>absolute age ; Archives &amp; records ; Asia ; Cenozoic ; chemical composition ; China ; Continental crust ; Dissolution ; Dissolving ; Far East ; Geochronology ; Geochronometry ; Geology ; Granite ; granites ; Hafnium ; Hafnium isotopes ; Heredity ; Hf-177/Hf-176 ; High temperature ; Himalayas ; igneous and metamorphic rocks ; igneous rocks ; intrusions ; Isotope composition ; Isotope ratios ; Isotopes ; Low temperature ; Melting ; metals ; Miocene ; Nariyongcuo Pluton ; Neogene ; nesosilicates ; orthosilicates ; Petrogenesis ; Petrology ; plutonic rocks ; plutons ; Radiation ; Radiation damage ; Radiometric dating ; Saturation ; silicates ; solution ; stable isotopes ; temperature ; Tertiary ; Trace elements ; Tracers ; U/Pb ; Uranium ; Xizang China ; Zircon ; zircon group</subject><ispartof>Geology (Boulder), 2022-03, Vol.50 (3), p.336-340</ispartof><rights>GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld @Alexandria, VA @USA @United States. 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However, zircon in granites generally shows large Hf isotope variations, and the reasons for this are debated. We applied U-Pb geochronology, trace-element, and Hf isotope analyses of zircon from the Miocene Himalayan granites to address this issue. Autocrystic zircon had εHf values (at 20 Ma) of -12.0 to -4.3 (median=-9). Inherited zircon yielded εHf values (at 20 Ma) of -34.8 to +0.3 (median=-13); the majority of εHf values were lower than those of autocrystic zircon. The εHf values of inherited zircon with high U concentrations resembled those of autocrystic zircon. Geochemical data indicates that the granites were generated during relatively low-temperature (&lt;800°C) partial melting of metasedimentary rocks, which, coupled with kinetic hindrance, may have led to the preferential dissolution of high-U zircon that could dissolve more efficiently into anatectic melt due to higher amounts of radiation damage. Consequently, Hf values of autocrystic zircon can be biased toward the values of U-rich zircon in the source. By contrast, literature data indicate that granites generated at high temperatures (&lt;820-850°C) generally contain autocrystic and inherited zircons with comparable Hf isotope values. During higher-temperature melting, indiscriminate dissolution of source zircon until saturation is reached will result in near-complete inheritance of Hf isotope ratios from the source. Our results impose an extra layer of complexity to interpretation of the zircon Hf isotope archive that is not currently considered.</description><subject>absolute age</subject><subject>Archives &amp; records</subject><subject>Asia</subject><subject>Cenozoic</subject><subject>chemical composition</subject><subject>China</subject><subject>Continental crust</subject><subject>Dissolution</subject><subject>Dissolving</subject><subject>Far East</subject><subject>Geochronology</subject><subject>Geochronometry</subject><subject>Geology</subject><subject>Granite</subject><subject>granites</subject><subject>Hafnium</subject><subject>Hafnium isotopes</subject><subject>Heredity</subject><subject>Hf-177/Hf-176</subject><subject>High temperature</subject><subject>Himalayas</subject><subject>igneous and metamorphic rocks</subject><subject>igneous rocks</subject><subject>intrusions</subject><subject>Isotope composition</subject><subject>Isotope ratios</subject><subject>Isotopes</subject><subject>Low temperature</subject><subject>Melting</subject><subject>metals</subject><subject>Miocene</subject><subject>Nariyongcuo Pluton</subject><subject>Neogene</subject><subject>nesosilicates</subject><subject>orthosilicates</subject><subject>Petrogenesis</subject><subject>Petrology</subject><subject>plutonic rocks</subject><subject>plutons</subject><subject>Radiation</subject><subject>Radiation damage</subject><subject>Radiometric dating</subject><subject>Saturation</subject><subject>silicates</subject><subject>solution</subject><subject>stable isotopes</subject><subject>temperature</subject><subject>Tertiary</subject><subject>Trace elements</subject><subject>Tracers</subject><subject>U/Pb</subject><subject>Uranium</subject><subject>Xizang China</subject><subject>Zircon</subject><subject>zircon group</subject><issn>0091-7613</issn><issn>1943-2682</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><recordid>eNpNkMFKxDAQhoMouK6CjxDwIkjXJJO2yVEWXYUFPeg5JGm6m6Xb1KRF9OltqQdPA8P3f8P8CF1TsqIUyP2GyyIvVvQELajkkLFCsFO0IETSrCwonKOLlA6EUJ6XYoHcW3S1i67tvW5w5VMKzdD70OJQ4yHq1g_HLHq7xz8-2nFtdYuN1wn3e4f3up4A7FPoQ-ewDccuJD_l0yTYTYLepUt0Vusmuau_uUQfT4_v6-ds-7p5WT9sMw1c9JktOQMBpakls0QWphLCGGDM0dyUQJ0mxDLBLTVgCqppoSsoJaty0CA4hSW6mb1dDJ-DS706hCG240nFCuC5kDKXI3U7UzaGlMb_VRf9UcdvRYmaSlRziWoS3s3ozoVkvWut-wqxqf55CWOKEAAp4Re3XHNi</recordid><startdate>20220301</startdate><enddate>20220301</enddate><creator>Gao Peng, Gao Peng</creator><creator>Yakymchuk, Chris</creator><creator>Zhang Jian, Zhang Jian</creator><creator>Yin Changqing, Yin Changqing</creator><creator>Qian Jiahui, Qian Jiahui</creator><creator>Li Yanguang, Li Yanguang</creator><general>Geological Society of America (GSA)</general><general>Geological Society of America</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7UA</scope><scope>C1K</scope><scope>F1W</scope><scope>H96</scope><scope>KL.</scope><scope>L.G</scope></search><sort><creationdate>20220301</creationdate><title>Preferential dissolution of uranium-rich zircon can bias the hafnium isotope compositions of granites</title><author>Gao Peng, Gao Peng ; 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identifier ISSN: 0091-7613
ispartof Geology (Boulder), 2022-03, Vol.50 (3), p.336-340
issn 0091-7613
1943-2682
language eng
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source GeoScienceWorld (GSW)
subjects absolute age
Archives & records
Asia
Cenozoic
chemical composition
China
Continental crust
Dissolution
Dissolving
Far East
Geochronology
Geochronometry
Geology
Granite
granites
Hafnium
Hafnium isotopes
Heredity
Hf-177/Hf-176
High temperature
Himalayas
igneous and metamorphic rocks
igneous rocks
intrusions
Isotope composition
Isotope ratios
Isotopes
Low temperature
Melting
metals
Miocene
Nariyongcuo Pluton
Neogene
nesosilicates
orthosilicates
Petrogenesis
Petrology
plutonic rocks
plutons
Radiation
Radiation damage
Radiometric dating
Saturation
silicates
solution
stable isotopes
temperature
Tertiary
Trace elements
Tracers
U/Pb
Uranium
Xizang China
Zircon
zircon group
title Preferential dissolution of uranium-rich zircon can bias the hafnium isotope compositions of granites
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