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<p>Mount Melbourne, which together with its associated volcanic vents forms the Mount Melbourne Volcanic Field (MMVF), constitutes one of the largest and youngest volcanic fields in northern Victoria Land, Antarctica. We present new major and trace elements analyses of volcanic glasses from hyaloclastite and lapilli tuff deposits, aiming to characterise and geochemically fingerprint the MMVF. The samples, primarily collected from proximal deposits, range from basaltic to moderately evolved felsic compositions, including one trachyte sample. The geochemical analyses and associated textural properties enhance the information available for MMVF glass samples, expanding the known range of compositional diversity and geochemical trends in the MMVF. The concentrations of selected trace elements (Th, Nb, La, Zr, Y) help to more thoroughly define these chemical evolutionary trends. The integration of our new results with published data defines chemical trends with different degrees of alkalinity. These different trends provide a valuable framework for provenance studies and allow for the integration of sample-to-sample correlation with trend-to-trend correlation.</p>

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Fingerprinting pyroclastic products from glaciated terrains to characterise tephra sources: insights from the Mount Melbourne Volcanic Field, northern Victoria Land, Antarctica

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Irene Rocchi,
  • Alessio Di Roberto,
  • Pier Paolo Giacomoni,
  • Sergio Rocchi

摘要

Mount Melbourne, which together with its associated volcanic vents forms the Mount Melbourne Volcanic Field (MMVF), constitutes one of the largest and youngest volcanic fields in northern Victoria Land, Antarctica. We present new major and trace elements analyses of volcanic glasses from hyaloclastite and lapilli tuff deposits, aiming to characterise and geochemically fingerprint the MMVF. The samples, primarily collected from proximal deposits, range from basaltic to moderately evolved felsic compositions, including one trachyte sample. The geochemical analyses and associated textural properties enhance the information available for MMVF glass samples, expanding the known range of compositional diversity and geochemical trends in the MMVF. The concentrations of selected trace elements (Th, Nb, La, Zr, Y) help to more thoroughly define these chemical evolutionary trends. The integration of our new results with published data defines chemical trends with different degrees of alkalinity. These different trends provide a valuable framework for provenance studies and allow for the integration of sample-to-sample correlation with trend-to-trend correlation.