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

Geldmacher, Jörg, van den Bogaard, Paul, Heydolph, Ken and Hoernle, Kaj (2014) The age of Earth’s largest volcano: Tamu Massif on Shatsky Rise (northwest Pacific Ocean) International Journal of Earth Sciences, 103 (8). pp. 2351-2357. DOI 10.1007/s00531-014-1078-6.

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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.

Document Type: Article
Additional Information: WOS:000344390400013
Keywords: Shatsky Rise ; Tamu Massif ; IODP ; Expedition 324 ; Oceanic plateau
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1007/s00531-014-1078-6
ISSN: 1437-3254
Projects: IODP
Date Deposited: 29 Sep 2014 10:52
Last Modified: 23 May 2017 08:45

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