U-Pb, trace element, and hafnium isotope composition of the Maniitsoq zircon: A potential new Archean zircon reference material (NAWLA 2019)
By: J.H. Marsh 1, T.R.C. Jørgensen 1, J.A. Petrus 1, M.A. Hamilton 2, and D.R. Mole 11. Mineral Exploration Research Centre, Harquail School of Earth Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada 2. Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada
Abstract
The U-Pb, trace element, and Hf isotope composition of zircon megacrysts from a late magmatic vein related to Mesoarchean gabbronorite from the Maniitsoq region of West Greenland have been extensively characterized by LA-ICPMS and TIMS analysis. The crystals are typically euhedral, 1-5 mm in diameter, and exhibit heterogeneous internal zoning, cut locally by thin, CL-bright veinlets. Chemical abrasion ID-TIMS U-Pb analysis of three fragments yield uniform, concordant results and a 207Pb/206Pb weighted average age of 3008.70 ± 0.72 Ma (MSWD = 0.9). LASS-MC-ICPMS U-Pb analyses, normalized to OGC zircon, exhibit slight normal discordance, with <2% discordant spots yielding an identical 207Pb/206Pb weighted average age of 3008.8 ± 2.2 Ma (n = 94; MSWD = 0.36). Uranium and Th concentrations average 141 ± 39 and 154 ± 77 ppm, respectively, with Th/U = 1.07. REE compositions are relatively uniform, with average total REE = 602 ± 186 ppm, positive Ce-anomaly (Ce/Ce* = 142) and negative Eu-anomaly (Eu/Eu* = 0.16), and moderate HREE enrichment (Yb/Gd = 5.6). Hf concentrations are moderate, averaging 10849 ± 630 ppm, with 176Yb/177Hf (0.015 ± 0.006) and 176Lu/177Hf (0.0005 ± 0.0001), close to the average for natural zircon. In comparison with common zircon reference materials, 176Yb/177Hf and 176Lu/177Hf are similar to that of Temora2, and greater than Mud Tank, 91500, and Plesovice zircon, making Maniitsoq well-suited for verifying the 176Yb+Lu interference correction on 176Hf/177Hf. The average interference-corrected 176Hf/177Hf value determined by LASS-MC-ICPMS is 0.280862 ± 21, with an age-corrected 176Hf/177Hfi value of 0.280833 ± 20, corresponding to a slightly negative average εHf value of -0.38 ± 0.70. The large crystal size, abundance, and largely homogeneous chemical and isotopic composition of the Maniitsoq zircon makes it a useful reference material for verifying the accuracy of U-Pb, trace element, and Hf isotope analyses by LA-ICPMS. Further characterization is in progress, and crystals will be distributed by the first author upon request.
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| Last Updated | March 25, 2026, 02:06 (UTC) |
| Created | March 25, 2026, 02:06 (UTC) |
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Title
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U-Pb, trace element, and hafnium isotope composition of the Maniitsoq zircon: A potential new Archean zircon reference material (NAWLA 2019) |
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Description
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By: J.H. Marsh 1, T.R.C. Jørgensen 1, J.A. Petrus 1, M.A. Hamilton 2, and D.R. Mole 1
1. Mineral Exploration Research Centre, Harquail School of Earth Sciences, Laurentian University, Sudbury, ON P3E2C6, Canada 2. Department of Earth Sciences, University of Toronto, Toronto, ON M5S 3B1, Canada Abstract The U-Pb, trace element, and Hf isotope composition of zircon megacrysts from a late magmatic vein related to Mesoarchean gabbronorite from the Maniitsoq region of West Greenland have been extensively characterized by LA-ICPMS and TIMS analysis. The crystals are typically euhedral, 1-5 mm in diameter, and exhibit heterogeneous internal zoning, cut locally by thin, CL-bright veinlets. Chemical abrasion ID-TIMS U-Pb analysis of three fragments yield uniform, concordant results and a 207Pb/206Pb weighted average age of 3008.70 ± 0.72 Ma (MSWD = 0.9). LASS-MC-ICPMS U-Pb analyses, normalized to OGC zircon, exhibit slight normal discordance, with <2% discordant spots yielding an identical 207Pb/206Pb weighted average age of 3008.8 ± 2.2 Ma (n = 94; MSWD = 0.36). Uranium and Th concentrations average 141 ± 39 and 154 ± 77 ppm, respectively, with Th/U = 1.07. REE compositions are relatively uniform, with average total REE = 602 ± 186 ppm, positive Ce-anomaly (Ce/Ce* = 142) and negative Eu-anomaly (Eu/Eu* = 0.16), and moderate HREE enrichment (Yb/Gd = 5.6). Hf concentrations are moderate, averaging 10849 ± 630 ppm, with 176Yb/177Hf (0.015 ± 0.006) and 176Lu/177Hf (0.0005 ± 0.0001), close to the average for natural zircon. In comparison with common zircon reference materials, 176Yb/177Hf and 176Lu/177Hf are similar to that of Temora2, and greater than Mud Tank, 91500, and Plesovice zircon, making Maniitsoq well-suited for verifying the 176Yb+Lu interference correction on 176Hf/177Hf. The average interference-corrected 176Hf/177Hf value determined by LASS-MC-ICPMS is 0.280862 ± 21, with an age-corrected 176Hf/177Hfi value of 0.280833 ± 20, corresponding to a slightly negative average εHf value of -0.38 ± 0.70. The large crystal size, abundance, and largely homogeneous chemical and isotopic composition of the Maniitsoq zircon makes it a useful reference material for verifying the accuracy of U-Pb, trace element, and Hf isotope analyses by LA-ICPMS. Further characterization is in progress, and crystals will be distributed by the first author upon request. |
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209.6 |
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2021-03-22 |
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https://metalearth.geohub.laurentian.ca/datasets/efecc968d830470fa791704962485a8e |
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MetalEarth |
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MetalEarth |
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2021-03-23 |
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efecc968d830470fa791704962485a8e |
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English |
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https://metalearth.geohub.laurentian.ca/datasets/efecc968d830470fa791704962485a8e |
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