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Updated: Jan 6, 2026

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Sampling the volatile-rich transition zone beneath Bermuda.

Sarah E Mazza1, Esteban Gazel2, Michael Bizimis3

  • 1Institute for Planetology, University of Münster, Münster, Germany. smazza@smith.edu.

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|May 17, 2019
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Summary
This summary is machine-generated.

Scientists discovered a unique mantle reservoir beneath Bermuda, characterized by extreme isotopic signatures and enriched volatiles. This finding suggests recent mantle recycling into the transition zone, challenging previous assumptions about deep mantle sources.

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Area of Science:

  • Geochemistry
  • Mantle Petrology
  • Isotope Geochemistry

Background:

  • Intraplate magmatic provinces offer insights into Earth's mantle composition and heterogeneity.
  • Mantle heterogeneities are often linked to subduction-driven recycling of volatiles and incompatible elements.
  • While some intraplate volcanoes tap deep mantle sources, shallower reservoirs also contribute to magma generation.

Purpose of the Study:

  • To investigate the composition and origin of a previously undocumented mantle domain sampled by Bermuda.
  • To characterize the unique isotopic signature and volatile content of this mantle reservoir.
  • To explore the implications for mantle recycling and the formation of extreme isotopic domains.

Main Methods:

  • High-precision isotope ratio measurements (Pb, Sr, Nd, Hf) of erupted lavas.
  • Geochemical analysis of silica-undersaturated melts.
  • Geodynamic modeling to understand mantle flow and reservoir sampling.

Main Results:

  • Bermuda samples a mantle domain with extreme, radiogenic 206Pb/204Pb isotopes (19.9-21.7) and low 207Pb/204Pb ratios (15.5-15.6).
  • The reservoir is enriched in incompatible elements and volatiles, with invariant Sr, Nd, and Hf isotopes, suggesting an age < 650 million years.
  • Evidence points to a transient reservoir in the mantle transition zone, possibly involving minerals like K-hollandite.

Conclusions:

  • The Bermuda source represents a novel, recently recycled mantle reservoir in the transition zone.
  • Subduction events during Pangea's formation likely contributed to the reservoir's formation and Atlantic-specific occurrence.
  • Geochemical evidence demonstrates the role of transition zone storage in generating extreme isotopic domains, previously attributed solely to deep recycling.