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<p>Thousands of cubic kilometers of magma lie in the upper crust below supervolcanoes such as Yellowstone (USA), Toba (Indonesia), and Taupo (New Zealand). Most of these systems are identified because of surface geomorphology and eruptive deposits. Recognizing such volcanoes without surface evidence is challenging, causing large magmatic reservoirs to go unnoticed. The Tuscan Magmatic Province, Italy, features only sparse Quaternary volcanic activity, but subsurface data indicate the presence of supercritical fluids at shallow depths. Here we show that more than 5’000 km<sup>3</sup> of magma and partial melt are stored in the middle crust of the Tuscan Magmatic Province, Italy. This fuels the high-enthalpy geothermal systems of the region. Such volumes are comparable to those of mid-crust reservoirs beneath recognized supervolcanoes. The discovery of large volumes of magma is critical to explain the long-term evolution of mature magmatic systems and to understand the behavior of large magmatic provinces.</p>

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High-enthalpy Larderello geothermal system, Italy, powered by thousands of cubic kilometres of mid-crustal magma

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  • 出版模式：

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  • 发表日期：

    2026年4月14日

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  • Matteo Lupi,
  • Douglas Stumpp,
  • Iván Cabrera-Pérez,
  • Konstantinos Michailos,
  • Gilberto Saccorotti,
  • Marco Bonini,
  • Federico Farina,
  • Elliot Amir Jiwani-Brown,
  • Riccardo Lanari,
  • Samuele Papeschi,
  • Geneviève Savard,
  • Juan Porras,
  • Julien Sfalcin,
  • Francisco Muñoz-Burbano,
  • Riccardo Minetto,
  • Chiara Del Ventisette,
  • Davide Piccinini,
  • Domenico Montanari

摘要

Thousands of cubic kilometers of magma lie in the upper crust below supervolcanoes such as Yellowstone (USA), Toba (Indonesia), and Taupo (New Zealand). Most of these systems are identified because of surface geomorphology and eruptive deposits. Recognizing such volcanoes without surface evidence is challenging, causing large magmatic reservoirs to go unnoticed. The Tuscan Magmatic Province, Italy, features only sparse Quaternary volcanic activity, but subsurface data indicate the presence of supercritical fluids at shallow depths. Here we show that more than 5’000 km3 of magma and partial melt are stored in the middle crust of the Tuscan Magmatic Province, Italy. This fuels the high-enthalpy geothermal systems of the region. Such volumes are comparable to those of mid-crust reservoirs beneath recognized supervolcanoes. The discovery of large volumes of magma is critical to explain the long-term evolution of mature magmatic systems and to understand the behavior of large magmatic provinces.