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<p>Since the early 1970s, helium isotopes <sup>3</sup>He and <sup>4</sup>He have been used to trace the sources of deep-seated fluids in various geodynamic settings. Observed variations in the <sup>3</sup>He/<sup>4</sup>He ratio measured at the surface are ascribed to source compositional variability or differences in the efficiency of mantle He transport through the continental crust. Given the high scientific relevance of helium isotopes across a wide range of geoscientific applications, it appears essential to compile existing bibliographic information on their global spatial distribution. Here, we present a dataset of the helium isotopic composition in geofluids from hydrothermal and tectonically active areas. Using two global databases published in 2006 and 2015 as a starting point, we have reviewed the existing international literature to compile a comprehensive database of data published up to 2024. The goal is to provide a resource for investigating potential relationships between helium isotopes with other geological, hydrogeological, and geophysical parameters and to formulate hypotheses regarding the role of geofluids in crustal deformation processes.</p>

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A global dataset of helium isotopic data in tectonically and hydrothermally active geological environments

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月17日

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  • Fabrizio Gherardi,
  • Gianluca Facca,
  • Lisa Pierotti,
  • Giovanni Martinelli,
  • Daniele Luigi Pinti

摘要

Since the early 1970s, helium isotopes 3He and 4He have been used to trace the sources of deep-seated fluids in various geodynamic settings. Observed variations in the 3He/4He ratio measured at the surface are ascribed to source compositional variability or differences in the efficiency of mantle He transport through the continental crust. Given the high scientific relevance of helium isotopes across a wide range of geoscientific applications, it appears essential to compile existing bibliographic information on their global spatial distribution. Here, we present a dataset of the helium isotopic composition in geofluids from hydrothermal and tectonically active areas. Using two global databases published in 2006 and 2015 as a starting point, we have reviewed the existing international literature to compile a comprehensive database of data published up to 2024. The goal is to provide a resource for investigating potential relationships between helium isotopes with other geological, hydrogeological, and geophysical parameters and to formulate hypotheses regarding the role of geofluids in crustal deformation processes.