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<p>The climactic explosive eruption of Hunga volcano in January 2022 destroyed a significant portion of the Hunga Tonga-Hunga Ha’apai islands, deepening the caldera floor by over 600&#xa0;m and depositing 3.5 km<sup>3</sup> of material onto its submarine flanks. In April–May 2022, just three months after the event, we conducted a rapid-response marine survey. Through hard-rock dredging across the submerged edifice, we recovered a comprehensive sample suite to investigate the geochemical evolution of the Hunga magma system. The dredged rocks span a compositional range from basalt to rhyolite, categorized into four groups: basalt–basaltic andesite (50.9–53.2 wt%), magnesian andesite (53.6–55.7 wt%), andesite–dacite (54.3–64.8 wt%), and rhyolite (70.8–73.2 wt%). A distinct 5 wt% gap exists between the dacites and rhyolites. While previously reported subaerial andesites largely overlap with the andesite–dacite group, our findings reveal a broader compositional diversity. These new data suggest the co-existence of both primary basaltic and primary andesitic magmas, offering new insights into the plumbing system of the 2022 eruption and similar arc volcanoes.</p>

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Discovery of basaltic and magnesian andesite magmas within the Hunga volcanic system, Tonga arc

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月31日

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  • Yoshihiko Tamura,
  • Tomoki Sato,
  • Richard Wysoczanski,
  • Kevin Mackay,
  • Iona McIntosh,
  • Qing Chang,
  • Takashi Miyazaki,
  • Bogdan Vaglarov,
  • Yasuhiro Hirai

摘要

The climactic explosive eruption of Hunga volcano in January 2022 destroyed a significant portion of the Hunga Tonga-Hunga Ha’apai islands, deepening the caldera floor by over 600 m and depositing 3.5 km3 of material onto its submarine flanks. In April–May 2022, just three months after the event, we conducted a rapid-response marine survey. Through hard-rock dredging across the submerged edifice, we recovered a comprehensive sample suite to investigate the geochemical evolution of the Hunga magma system. The dredged rocks span a compositional range from basalt to rhyolite, categorized into four groups: basalt–basaltic andesite (50.9–53.2 wt%), magnesian andesite (53.6–55.7 wt%), andesite–dacite (54.3–64.8 wt%), and rhyolite (70.8–73.2 wt%). A distinct 5 wt% gap exists between the dacites and rhyolites. While previously reported subaerial andesites largely overlap with the andesite–dacite group, our findings reveal a broader compositional diversity. These new data suggest the co-existence of both primary basaltic and primary andesitic magmas, offering new insights into the plumbing system of the 2022 eruption and similar arc volcanoes.