Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses
Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS)), and U-Pb geochronology (...
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MDPI AG
2018-05-01
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| Series: | Geosciences |
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| Online Access: | http://www.mdpi.com/2076-3263/8/5/169 |
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| author | Marian V. Lupulescu Jeffrey R. Chiarenzelli Mark E. Pecha Jared W. Singer Sean P. Regan |
| author_facet | Marian V. Lupulescu Jeffrey R. Chiarenzelli Mark E. Pecha Jared W. Singer Sean P. Regan |
| author_sort | Marian V. Lupulescu |
| collection | DOAJ |
| description | Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS)), and U-Pb geochronology (Laser AblationMulti-Collector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS)). All four pegmatite localities sampled are hosted by the Proterozoic Fordham gneiss and/or Paleozoic Bedford gneiss (Columbite-(Fe); Kinkel and Baylis localities) and the Manhattan Schist of Lower Paleozoic age (Columbite-(Mn); Fort George and Harlem River Drive localities) and yield Neoacadian ages. The weighted average U-Pb ages are 372.2 ± 8.2 Ma (Baylis Quarry), 371.3 ± 7.3 and 383.4 ± 8.9 Ma (Kinkel Quarry); 383 ± 15 Ma (185th St. and Harlem River Drive); and 372 ± 10 Ma (Fort George). A partial metamict zircon (“cyrtolite”) from the Kinkel Quarry yielded a weighted average U-Pb age of 376.9 ± 4.3 Ma. The Neoacadian ages obtained agree with those determined by thermal ionization mass spectrometry (TIMS) for zircon from Lithium-Cesium-Tantalum (LCT) pegmatites from Connecticut and Maine. No pegmatites temporally associated with the Taconic orogeny were found. The size, lack of common Pb, uniform U concentrations across crystal cross-sections, sufficient but moderate uranium concentrations, lack of metamictization, and consistency in U-Pb isotopic ratios for columbite samples BCB-COL, NYSM #25232, and NYSM #525.8 suggests they show promise as potential standards for oxide mineral LA-MC-ICP-MS geochronological analyses, however, additional characterization using ID-TIMS would be necessary to develop as such. |
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| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-04-12T22:04:44Z |
| publishDate | 2018-05-01 |
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| spelling | doaj.art-05a6bd9cc3cc4e61905726a43cbe385e2022-12-22T03:14:59ZengMDPI AGGeosciences2076-32632018-05-018516910.3390/geosciences8050169geosciences8050169Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical AnalysesMarian V. Lupulescu0Jeffrey R. Chiarenzelli1Mark E. Pecha2Jared W. Singer3Sean P. Regan4New York State Museum, Research and Collections, Albany, NY 12230, USADepartment of Geology, St. Lawrence University, Canton, NY 13617, USADepartment of Geosciences, University of Arizona, Tucson, AZ 85721, USADepartment of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY 12180, USAEastern Geology and Paleoclimate Center, U.S. Geological Survey, P.O. Box 628, Montpelier, VT 05602, USAColumbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS)), and U-Pb geochronology (Laser AblationMulti-Collector-Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICP-MS)). All four pegmatite localities sampled are hosted by the Proterozoic Fordham gneiss and/or Paleozoic Bedford gneiss (Columbite-(Fe); Kinkel and Baylis localities) and the Manhattan Schist of Lower Paleozoic age (Columbite-(Mn); Fort George and Harlem River Drive localities) and yield Neoacadian ages. The weighted average U-Pb ages are 372.2 ± 8.2 Ma (Baylis Quarry), 371.3 ± 7.3 and 383.4 ± 8.9 Ma (Kinkel Quarry); 383 ± 15 Ma (185th St. and Harlem River Drive); and 372 ± 10 Ma (Fort George). A partial metamict zircon (“cyrtolite”) from the Kinkel Quarry yielded a weighted average U-Pb age of 376.9 ± 4.3 Ma. The Neoacadian ages obtained agree with those determined by thermal ionization mass spectrometry (TIMS) for zircon from Lithium-Cesium-Tantalum (LCT) pegmatites from Connecticut and Maine. No pegmatites temporally associated with the Taconic orogeny were found. The size, lack of common Pb, uniform U concentrations across crystal cross-sections, sufficient but moderate uranium concentrations, lack of metamictization, and consistency in U-Pb isotopic ratios for columbite samples BCB-COL, NYSM #25232, and NYSM #525.8 suggests they show promise as potential standards for oxide mineral LA-MC-ICP-MS geochronological analyses, however, additional characterization using ID-TIMS would be necessary to develop as such.http://www.mdpi.com/2076-3263/8/5/169NYF pegmatitescolumbite-(Fe)columbite-(Mn)BedfordManhattanNeoacadianU-Pb columbite geochronology |
| spellingShingle | Marian V. Lupulescu Jeffrey R. Chiarenzelli Mark E. Pecha Jared W. Singer Sean P. Regan Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses Geosciences NYF pegmatites columbite-(Fe) columbite-(Mn) Bedford Manhattan Neoacadian U-Pb columbite geochronology |
| title | Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses |
| title_full | Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses |
| title_fullStr | Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses |
| title_full_unstemmed | Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses |
| title_short | Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses |
| title_sort | columbite group minerals from new york pegmatites insights from isotopic and geochemical analyses |
| topic | NYF pegmatites columbite-(Fe) columbite-(Mn) Bedford Manhattan Neoacadian U-Pb columbite geochronology |
| url | http://www.mdpi.com/2076-3263/8/5/169 |
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