The age of Earth's largest volcano; Tamu Massif on Shatsky Rise (Northwest Pacific Ocean)

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doi: 10.1007/s00531-014-1078-6
Author(s): Geldmacher, Jörg; van den Bogaard, Paul; Heydolph, Ken; Hoernle, Kaj
Author Affiliation(s): Primary:
GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
Volume Title: International Journal of Earth Sciences Geologische Rundschau
Source: International Journal of Earth Sciences = Geologische Rundschau, 103(8), p.2351-2357. Publisher: Springer International, Berlin, Germany. ISSN: 1437-3254
Note: In English. The online version of this article (DOI: 10.1007/s00531-014-1078-6) contains supplementary material, which is available to authorized users. 41 refs.; illus., incl. 1 table, strat. col., sketch map
Summary: 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. Copyright 2014 Springer-Verlag Berlin Heidelberg
Year of Publication: 2014
Research Program: IODP Integrated Ocean Drilling Program
ODP Ocean Drilling Program
Key Words: 05 Petrology, Igneous and Metamorphic; Absolute age; Ar/Ar; Cores; Cretaceous; Dates; Expedition 324; IODP Site U1347; Integrated Ocean Drilling Program; Jurassic; Lava; Leg 198; Lower Cretaceous; Mantle; Mantle plumes; Melts; Mesozoic; North Pacific; Northwest Pacific; ODP Site 1213; Ocean Drilling Program; Pacific Ocean; Shatsky Rise; Tamu Massif; Upper Jurassic; Volcanism; Volcanoes; West Pacific
Coordinates: N310000 N340000 E1600000 E1560000
Record ID: 2015026140
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