U-Pb age determination of schorlomite garnet by laser ablation inductively coupled plasma mass spectrometryElectronic supplementary information (ESI) available. See DOI: 10.1039/c7ja00315c
We report the first U-Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U-Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundan...
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Abstract | We report the first U-Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U-Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundances and negligible common Pb content. The comparative matrix effects of laser ablation of zircon and schorlomite are investigated and demonstrate the necessity of a suitable matrix-matched reference material for schorlomite geochronology. Laser-induced elemental fractional and instrumental mass discrimination were externally-corrected using an in house schorlomite reference material (WS20) for U-Pb geochronology. In order to validate the effectiveness and robustness of our analytical protocol, we demonstrate the veracity of U-Pb age determination for five schorlomite samples from: the Magnet Cove complex, Arkansas (USA); the Fanshan ultrapotassic complex, Hebei (China); the Ozernaya alkaline ultramafic complex, Kola Peninsula (Russia); the Alnö alkaline-rock carbonatite complex (Sweden); and the Prairie Lake carbonatite complex, Ontario (Canada). The schorlomite U-Pb ages range from 96 Ma to 1160 Ma, and are almost identical to ages determined from other accessory minerals in these complexes and support the reliability of our analytical protocol. Schorlomite garnet U-Pb geochronology is considered to be a promising new technique for understanding the genesis of carbonatites, alkaline rocks, and related rare-metal deposits.
We report the first U-Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U-Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundances and negligible common Pb content. |
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AbstractList | We report the first U-Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U-Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundances and negligible common Pb content. The comparative matrix effects of laser ablation of zircon and schorlomite are investigated and demonstrate the necessity of a suitable matrix-matched reference material for schorlomite geochronology. Laser-induced elemental fractional and instrumental mass discrimination were externally-corrected using an in house schorlomite reference material (WS20) for U-Pb geochronology. In order to validate the effectiveness and robustness of our analytical protocol, we demonstrate the veracity of U-Pb age determination for five schorlomite samples from: the Magnet Cove complex, Arkansas (USA); the Fanshan ultrapotassic complex, Hebei (China); the Ozernaya alkaline ultramafic complex, Kola Peninsula (Russia); the Alnö alkaline-rock carbonatite complex (Sweden); and the Prairie Lake carbonatite complex, Ontario (Canada). The schorlomite U-Pb ages range from 96 Ma to 1160 Ma, and are almost identical to ages determined from other accessory minerals in these complexes and support the reliability of our analytical protocol. Schorlomite garnet U-Pb geochronology is considered to be a promising new technique for understanding the genesis of carbonatites, alkaline rocks, and related rare-metal deposits.
We report the first U-Pb geochronological investigation of schorlomite garnet from carbonatite and alkaline complexes and demonstrate its applicability for U-Pb age determination using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) due to its relatively high U and Th abundances and negligible common Pb content. |
Author | Yang, Yue-Heng Mitchell, Roger H Zhao, Zi-Fu Wu, Fu-Yuan Xie, Lie-Wen Huang, Chao Ma, Qian Yang, Ming Yang, Jin-Hui Zhao, Han |
AuthorAffiliation | Chinese Academy of Sciences Institutions of Earth Science China University of Geosciences School of Earth and Space Science CAS Key Laboratory of Crust-Mantle Materials and Environments University of Chinese Academy of Sciences University of Science and Technology of China State Key Laboratory of Lithospheric Evolution Department of Geology Institute of Geology and Geophysics School of Earth Science and Resources Lakehead University State Key Laboratory of Geological Processes and Mineral Resources |
AuthorAffiliation_xml | – name: University of Science and Technology of China – name: Institute of Geology and Geophysics – name: Chinese Academy of Sciences – name: CAS Key Laboratory of Crust-Mantle Materials and Environments – name: State Key Laboratory of Lithospheric Evolution – name: School of Earth Science and Resources – name: University of Chinese Academy of Sciences – name: Department of Geology – name: Institutions of Earth Science – name: Lakehead University – name: School of Earth and Space Science – name: State Key Laboratory of Geological Processes and Mineral Resources – name: China University of Geosciences |
Author_xml | – sequence: 1 givenname: Yue-Heng surname: Yang fullname: Yang, Yue-Heng – sequence: 2 givenname: Fu-Yuan surname: Wu fullname: Wu, Fu-Yuan – sequence: 3 givenname: Jin-Hui surname: Yang fullname: Yang, Jin-Hui – sequence: 4 givenname: Roger H surname: Mitchell fullname: Mitchell, Roger H – sequence: 5 givenname: Zi-Fu surname: Zhao fullname: Zhao, Zi-Fu – sequence: 6 givenname: Lie-Wen surname: Xie fullname: Xie, Lie-Wen – sequence: 7 givenname: Chao surname: Huang fullname: Huang, Chao – sequence: 8 givenname: Qian surname: Ma fullname: Ma, Qian – sequence: 9 givenname: Ming surname: Yang fullname: Yang, Ming – sequence: 10 givenname: Han surname: Zhao fullname: Zhao, Han |
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