火山作用
地质学
地球科学
天体生物学
地球化学
古生物学
物理
构造学
作者
Katherine de Kleer,Ery Hughes,F. Nimmo,John M. Eiler,Amy E. Hofmann,Statia Luszcz‐Cook,K. Mandt
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2024-04-18
被引量:2
标识
DOI:10.1126/science.adj0625
摘要
Jupiter’s moon Io hosts extensive volcanism, driven by tidal heating. The isotopic composition of Io’s inventory of volatile chemical elements, including sulfur and chlorine, reflects its outgassing and mass loss history, and thus records information about its evolution. We used millimeter observations of Io’s atmosphere to measure sulfur isotopes in gaseous SO 2 and SO, and chlorine isotopes in gaseous NaCl and KCl. We find 34 S/ 32 S = 0.0595 ± 0.0038 (equivalent to δ 34 S = +347 ± 86‰), which is highly enriched compared to average Solar System values and indicates that Io has lost 94 to 99% of its available sulfur. Our measurement of 37 Cl/ 35 Cl = 0.403 ± 0.028 (δ 37 Cl = +263 ± 88‰) shows that chlorine is similarly enriched. These results indicate that Io has been volcanically active for most (or all) of its history, with potentially higher outgassing and mass-loss rates at earlier times.
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