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- July 22, 2025
[Frontier Letter] A new paleomagnetic constraint on the duration of a twin caldera-forming eruption sequence: a potential solution to an enduring problem in decoding >VEI 7 eruption timescales
New paleomagnetic results from the twin caldera-forming Mamaku–Ohakuri eruption deposits (VEI=7) in the Taupō Volcanic Zone of New Zealand show that the entire pyroclastic sequence accumulated within a geomagnetic excursion event. The older Mamaku ignimbrite is moderately welded and has been previously correlated with the ~240 ka Mamaku excursion. By utilizing a refined technique to extract samples from multiple units in the eruption sequence (including the Mamaku ignimbrite) and measuring mean characteristic remanent magnetization directions, we establish that the entire sequence may have occurred over decades to centuries, and that the geomagnetic directional changing rate probably fluctuated significantly during the excursion, up to several degrees per day.
- Gravley et al. (2025): [Frontier Letter] A new paleomagnetic constraint on the duration of a twin caldera-forming eruption sequence: a potential solution to an enduring problem in decoding >VEI 7 eruption timescales. Earth Planets Space 77:106, https://doi.org/10.1186/s40623-025-02179-9
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