Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation
Abstract The Xihuashan and Yaogangxian granitic plutons in South China comprise highly evolved multiphase Li‐rich granites and host quartz‐vein‐type tungsten deposits. The δ7Li values of Phase A (early stage), B (middle stage), and C (late stage) from the Xihuashan pluton are 1.0–1.2‰, 1.1–3.0‰, and...
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| Format: | Article |
| Language: | English |
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Wiley
2023-04-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2022GC010771 |
| _version_ | 1797638116276699136 |
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| author | Jie‐Hua Yang Heng Chen Mei‐Fu Zhou Rui‐Zhong Hu Anthony E. Williams‐Jones |
| author_facet | Jie‐Hua Yang Heng Chen Mei‐Fu Zhou Rui‐Zhong Hu Anthony E. Williams‐Jones |
| author_sort | Jie‐Hua Yang |
| collection | DOAJ |
| description | Abstract The Xihuashan and Yaogangxian granitic plutons in South China comprise highly evolved multiphase Li‐rich granites and host quartz‐vein‐type tungsten deposits. The δ7Li values of Phase A (early stage), B (middle stage), and C (late stage) from the Xihuashan pluton are 1.0–1.2‰, 1.1–3.0‰, and 2.4–2.8‰ respectively, increasing through chemical evolution. The granites from the Yaogangxian pluton also display gradually enriched in heavy Li isotopes in a later stage, although systematically lighter than those of the Xihuashan pluton. In both plutons, the δ7Li shows good correlations with SiO2 and Li concentrations as well as Rb/Sr, Nb/Ta, and Zr/Hf ratios, indicating Li isotopic fractionation most likely caused by magmatic differentiation. In situ analyses show that the minerals of Xihuashan pluton record a continuous elemental spectrum, reflecting the results of progressive magmatic differentiation. The δ7Li values of quartz, feldspar, mica, and zircon all correlate well with the chemical evolutions of granitic magma, systematically elevated in Phases B and C relative to Phase A. The Li isotope data of the mineral separates further document that the enrichment of 7Li in the residual melt was most likely due to the equilibrium fractionation between the mineral and melts. The data are interpreted to reflect that intense magmatic differentiation was responsible for Li isotopic variations coupled with the enrichment in the Li, F, P, and rare metals in the late‐phase granites of the Xihuashan pluton. The lithium isotope behavior documented in this study provides new insights into magmatic differentiation and associated rare‐metal mineralization. |
| first_indexed | 2024-03-11T12:58:59Z |
| format | Article |
| id | doaj.art-e4d37124396d47e8a62e809c42e0c848 |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:58:59Z |
| publishDate | 2023-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-e4d37124396d47e8a62e809c42e0c8482023-11-03T16:55:52ZengWileyGeochemistry, Geophysics, Geosystems1525-20272023-04-01244n/an/a10.1029/2022GC010771Lithium Isotope Fractionation During Intensive Felsic Magmatic DifferentiationJie‐Hua Yang0Heng Chen1Mei‐Fu Zhou2Rui‐Zhong Hu3Anthony E. Williams‐Jones4State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaLamont‐Doherty Earth Observatory Columbia University Palisades NY USAState Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaState Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang ChinaDepartment of Earth and Planetary Sciences McGill University Montréal Québec CanadaAbstract The Xihuashan and Yaogangxian granitic plutons in South China comprise highly evolved multiphase Li‐rich granites and host quartz‐vein‐type tungsten deposits. The δ7Li values of Phase A (early stage), B (middle stage), and C (late stage) from the Xihuashan pluton are 1.0–1.2‰, 1.1–3.0‰, and 2.4–2.8‰ respectively, increasing through chemical evolution. The granites from the Yaogangxian pluton also display gradually enriched in heavy Li isotopes in a later stage, although systematically lighter than those of the Xihuashan pluton. In both plutons, the δ7Li shows good correlations with SiO2 and Li concentrations as well as Rb/Sr, Nb/Ta, and Zr/Hf ratios, indicating Li isotopic fractionation most likely caused by magmatic differentiation. In situ analyses show that the minerals of Xihuashan pluton record a continuous elemental spectrum, reflecting the results of progressive magmatic differentiation. The δ7Li values of quartz, feldspar, mica, and zircon all correlate well with the chemical evolutions of granitic magma, systematically elevated in Phases B and C relative to Phase A. The Li isotope data of the mineral separates further document that the enrichment of 7Li in the residual melt was most likely due to the equilibrium fractionation between the mineral and melts. The data are interpreted to reflect that intense magmatic differentiation was responsible for Li isotopic variations coupled with the enrichment in the Li, F, P, and rare metals in the late‐phase granites of the Xihuashan pluton. The lithium isotope behavior documented in this study provides new insights into magmatic differentiation and associated rare‐metal mineralization.https://doi.org/10.1029/2022GC010771lithium isotopesmagmatic differentiationtungsten depositgraniteisotope fractionation |
| spellingShingle | Jie‐Hua Yang Heng Chen Mei‐Fu Zhou Rui‐Zhong Hu Anthony E. Williams‐Jones Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation Geochemistry, Geophysics, Geosystems lithium isotopes magmatic differentiation tungsten deposit granite isotope fractionation |
| title | Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation |
| title_full | Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation |
| title_fullStr | Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation |
| title_full_unstemmed | Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation |
| title_short | Lithium Isotope Fractionation During Intensive Felsic Magmatic Differentiation |
| title_sort | lithium isotope fractionation during intensive felsic magmatic differentiation |
| topic | lithium isotopes magmatic differentiation tungsten deposit granite isotope fractionation |
| url | https://doi.org/10.1029/2022GC010771 |
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