Age of the Hawaiian-Emperor bend
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Abstract
40Ar/39Ar age data on alkalic and tholeiitic basalts from Diakakuji and Kinmei Seamounts in the vicinity of the Hawaiian-Emperor bend indicate that these volcanoes are about 41 and 39 m.y. old, respectively. Combined with previously published age data on Yuryaku and Ko¯ko Seamounts, the new data indicate that the best age for the bend is 42.0 ± 1.4 m.y.
Petrochemical data indicate that the volcanic rocks recovered from bend seamounts are indistinguishable from Hawaiian volcanic rocks, strengthening the hypothesis that the Hawaiian-Emperor bend is part of the Hawaiian volcanic chain.
40Ar/39Ar total fusion ages on altered whole-rock basalt samples are consistent with feldspar ages and with40Ar/39Ar incremental heating data and appear to reflect the crystallization ages of the samples even though conventional K-Ar ages are significantly younger. The cause of this effect is not known but it may be due to low-temperature loss of39Ar from nonretentive montmorillonite clays that have also lost40Ar.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Age of the Hawaiian-Emperor bend |
| Series title | Earth and Planetary Science Letters |
| DOI | 10.1016/0012-821X(76)90113-8 |
| Volume | 31 |
| Issue | 3 |
| Year Published | 1976 |
| Language | English |
| Publisher | Elsevier |
| Description | 17 p. |
| First page | 313 |
| Last page | 329 |
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