1887
Volume 37, Issue 6
  • E-ISSN: 1365-2117
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Abstract

[

Widepsread and thick megabeds occur in the Marsili Basin of the Tyrrhenian Sea. Megabeds are linked to volcanic eruptions. The Marsili megabeds are recorded by thick turbidites to complex and heterogeneous deposits.

, Highlights

  • A sequence of 5 megabeds occurs in the upper 60 kyrs of strata in the deepwater Marsili Basin in the Tyrrhenian Sea.
  • The Marsili megabeds are more internally complex than previously thought.
  • New age‐dates and XRF data aligns the Marsili Megabeds with volcanic eruptions from the Phlegraean Fields of Italy.

, ABSTRACT

Megabeds, also known as ‘megaturbidites,’ are exceptionally large submarine sediment deposits likely formed by catastrophic geohazard events. These deposits are increasingly being identified with modern high‐resolution geophysical data, yet their origins and characteristics remain debated. Five megabeds have been identified in the Marsili Basin of the Tyrrhenian Sea within the upper 70 m of sediment. These deposits are hypothesized to have been triggered by explosive volcanic eruptions of the Campanian Volcanic Province, including the ~39.8 ka Campanian Ignimbrite (CI) super‐eruption, which is among the largest known eruptions, having a volcanic explosivity index (VEI) of 7. These megabeds were intersected by Ocean Drilling Program (ODP) Leg 107 Site 650, where sediment cores were collected in 1986. However, their presence was not recognized at the time due to lack of appropriate geophysical data. To better understand the properties and origins of the Marsili Megabeds, we identified the megabeds within the ODP cores and conducted detailed sedimentological and elemental analyses, along with age dating, to determine their possible sediment provenance, depositional mechanisms, and potential triggering events. Elemental analysis and age dating suggest a potential link between these megabeds and known eruptions from the Campanian Volcanic Province, including the Neapolitan Yellow Tuffs eruption (14.9 ka), the Masseria del Monte Tuff eruption (29.3 ka), and the Campanian Ignimbrite super‐eruption (39.8 ka). A new megabed discovered below the Y‐7 tephra is older than 60,300 years but its triggering event is unknown. The re‐examination of ODP cores reveals that not all megabeds conform to a megaturbidite morphology. In the Marsili Basin, the variety of sedimentological structures differs within and between megabeds, suggesting varying and complex depositional mechanisms. The findings reveal that the megabeds are more internally complex than previously thought, with variations in their depositional processes even in one basin.

]
Basin Research © 2025 John Wiley & Sons Ltd, European Association of Geoscientists & Engineers and International Association of Sedimentologists © 2025 The Author(s). Basin Research published by International Association of Sedimentologists and European Association of Geoscientists and Engineers and John Wiley & Sons Ltd.
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Megabeds in the Marsili Basin, Tyrrhenian Sea
Basin Research 37, e70074 (2025); https://doi.org/10.1111/bre.70074
/content/journals/10.1111/bre.70074
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  • Article Type: Research Article
Keyword(s): geohazard; geophysics; gravity flow; marine geology; Marsili Basin; megabed; XRF

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