International Journal of Earth Sciences

, Volume 103, Issue 8, pp 2351–2357 | Cite as

The age of Earth’s largest volcano: Tamu Massif on Shatsky Rise (northwest Pacific Ocean)

  • Jörg Geldmacher
  • Paul van den Bogaard
  • Ken Heydolph
  • Kaj Hoernle
Short note

Abstract

This study presents laser step-heating 40Ar/39Ar age determinations of basaltic lava samples from Tamu Massif, the oldest and largest edifice of the submarine Shatsky Rise in the northwest Pacific and Earth’s proposed largest volcano. The rocks were recovered during Integrated Ocean Drilling Program Expedition 324, which cored 160 m into the igneous basement near the summit of Tamu Massif. The analyzed lavas cover all three major stratigraphic groups penetrated at this site and confirm a Late Jurassic/Early Cretaceous age for the onset of Shatsky Rise volcanism. Lavas analyzed from the lower and middle section of the hole yield plateau ages between 144.4 ± 1.0 and 143.1 ± 3.3 Ma with overlapping analytical errors (2σ), whereas a sample from the uppermost lava group produced a significantly younger age of 133.9 ± 2.3 Ma suggesting a late or rejuvenated phase of volcanism. The new geochronological data infer minimum (average) melt production rates of 0.63–0.84 km3/a over a time interval of 3–4 million years consistent with the presence of a mantle plume.

Keywords

Shatsky Rise Tamu Massif IODP Expedition 324 Oceanic plateau 

Supplementary material

531_2014_1078_MOESM1_ESM.xls (70 kb)
Online Resource 1 (XLS 70 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Jörg Geldmacher
    • 1
  • Paul van den Bogaard
    • 1
  • Ken Heydolph
    • 1
  • Kaj Hoernle
    • 1
  1. 1.GEOMAR Helmholtz Centre for Ocean Research KielKielGermany

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