Hydrothermal Vesuvianite: A U-Pb Dating Mineral
Since mineral deposits are the products of multiple hydrothermal pulses, in many circumstances, selecting a robust mineral to date the different mineralization events precisely is important. Vesuvianite, usually known as a rock-forming or accessory silicate mineral typically found in metasomatic and...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
GeoScienceWorld
2025-03-01
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| Series: | Lithosphere |
| Online Access: | https://pubs.geoscienceworld.org/gsa/lithosphere/article-pdf/doi/10.2113/2025/lithosphere_2024_193/653415/lithosphere_2024_193.pdf |
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| Summary: | Since mineral deposits are the products of multiple hydrothermal pulses, in many circumstances, selecting a robust mineral to date the different mineralization events precisely is important. Vesuvianite, usually known as a rock-forming or accessory silicate mineral typically found in metasomatic and regional metamorphic calcsilicate rocks, has the potential to be a dating mineral. Vesuvianite crystallized entirely from saturated boiling hydrothermal fluid has not been previously reported. Here, we report a new occurrence of hydrovesuvianite, which yields a reliable U-Pb isotope age, is associated with quartz and zircon in hydrothermal veins in central Madagascar. The hydrovesuvianite and associated minerals entirely crystallized from a boiling hydrothermal fluid with relatively low salinities at 290–320°C and 70 bars. The hydrovesuvianite has cell parameters of a 15.6254(5), c 11.8870(9) Å, and space group P4/nnc. The chemical composition of the hydrovesuvianite is similar to vesuvianites of metamorphic origin, and they have LREE-enriched chondrite-normalized rare earth element (REE) patterns and negative Eu anomalies. The hydrovesuvianite crystallized at 526.7 ± 3.6 Ma. Hydrothermal vesuvianite is an ideal U-Pb isotope dating mineral for hydrothermal mineralization and vesuvianite-bearing metamorphic rocks. |
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| ISSN: | 1941-8264 1947-4253 |