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<p>Fossils are rare in metamorphic rocks due to recrystallization and deformation, especially under high-pressure metamorphic conditions. Here, we report the discovery of exceptionally preserved Paleozoic palynofloras in ten graphite-rich samples collected from the Dora-Maira Massif (Western Alps), which underwent blueschist-facies to ultra-high-pressure (UHP) metamorphism (~ 28 kbar, 520&#xa0;°C). These findings challenge the assumption that fossils cannot survive such conditions, offering a new biostratigraphic tool for reconstructing the geological and tectonic history of metamorphic basement in collisional orogens worldwide.</p>

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Buried, not erased: palynofloras in ultra-high-pressure metamorphic rocks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月14日

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  • Rodolfo Carosi,
  • Chiara Montomoli,
  • Salvatore Iaccarino,
  • Davide Dana,
  • Alberto Corno,
  • Francesco De Cesari,
  • Amalia Spina

摘要

Fossils are rare in metamorphic rocks due to recrystallization and deformation, especially under high-pressure metamorphic conditions. Here, we report the discovery of exceptionally preserved Paleozoic palynofloras in ten graphite-rich samples collected from the Dora-Maira Massif (Western Alps), which underwent blueschist-facies to ultra-high-pressure (UHP) metamorphism (~ 28 kbar, 520 °C). These findings challenge the assumption that fossils cannot survive such conditions, offering a new biostratigraphic tool for reconstructing the geological and tectonic history of metamorphic basement in collisional orogens worldwide.