Pyrite trace element proxies for magmatic volatile influx in submarine subduction-related hydrothermal systems
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Title
- Pyrite trace element proxies for magmatic volatile influx in submarine subduction-related hydrothermal systems
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Author(s)
- Falkenberg, Jan J.; Keith, Manuel; Haase, Karsten M.; Klemd, Reiner; Kutzschbach, Martin; Grosche, Anna; Scicchitano, Maria Rosa; Strauss, Harald; Kim, Jonguk
- KIOST Author(s)
- Kim, Jonguk(김종욱)
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Alternative Author(s)
- 김종욱
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Publication Year
- 2024-05
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Abstract
- Seafloor massive sulfides are modern analogues to ancient volcanogenic massive sulfide deposits, which are particularly enriched in volatile and precious metals (e.g., Te, Au, Ag, Cu, Bi, Se) in subduction-related settings. However, the sources of metals are still poorly constrained, and it remains elusive, whether magmatic volatile influx controls their distribution in submarine hydrothermal systems on the plate tectonic-scale. Here, we demonstrate, for the first time, that Te, As, and Sb contents as well as related Te/As and Te/Sb ratios vary systematically with the δ34S composition of pyrite and native S, as reported by high-resolution coupled SIMS δ34S and trace element LA-ICP-MS micro-analysis. The better correlation of element ratios (Te/As, Te/Sb) opposed to trace element contents (e.g., Te) with δ34S in pyrite demonstrates that element ratios provide a more robust record of magmatic volatile influx than their absolute contents. On this basis, we define a quantitative threshold of high Te/As (>0.004) and Te/Sb (>0.6) ratios in pyrite that are indicative of magmatic volatile influx to submarine subduction-related hydrothermal systems. Two-component fluid mixing simulations further revealed that <5 % of magmatic volatile influx drastically changes the Te/As (and Te/Sb) ratio of the modelled fluid, but only slightly changes its δ34S composition. This suggests that Te/As and Te/Sb ratios are more sensitive to a magmatic volatile influx into seawater-dominated hydrothermal systems than δ34S signatures if the magmatic volatile influx was low. Beyond this, our results demonstrate that magma-derived fluid mixing with seawater only has a negligible effect on the magmatic volatile record of Te/As and Te/Sb, while the S isotope system is prone for seawater overprinting leading to commonly ambiguous source signatures. Thus, Te/As and Te/Sb systematics in pyrite provide a robust proxy to evaluate the contribution of magmatic volatiles to submarine hydrothermal systems from the grain- to plate tectonic-scale.
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ISSN
- 0016-7037
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URI
- https://sciwatch.kiost.ac.kr/handle/2020.kiost/45516
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DOI
- 10.1016/j.gca.2024.03.026
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Bibliographic Citation
- Geochimica et Cosmochimica Acta, v.373, pp.52 - 67, 2024
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Publisher
- Pergamon Press Ltd.
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Keywords
- Pyrite; coupled SIMS δ34S and LA-ICP-MS trace element data; Submarine hydrothermal systems; Black smokers; Magmatic fluids; In-situ sulfide chemistry; Magmatic volatile phase
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Type
- Article
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Language
- English
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Document Type
- Article
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