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Dalrymple, G.B. and Clague, D.A. (1976). Age of the Hawaiian-Emperor Bend. Earth and Planetary Science Letters 31(3): 313-329. |
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(super 40) Ar/ (super 39) r 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 Koko 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. (super 40) Ar/ (super 39) Ar total fusion ages on altered whole-rock basalt samples are consistent with feldspar ages and with (super 40) Ar/ (super 39) Ar 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 of (super 39) Ar from nonretentive montmorillonite clays that have also lost (super 40) Ar. |
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Keywords
absolute age; alkalic; Ar/Ar; basalts; Cenozoic; data; dates; East, Pacific; East Pacific Ocean Islands; Emperor Seamounts; Eocene;, geochronology; Hawaii; Hawaiian Ridge; Hawaiian-Emperor Bend;, igneous rocks; K/Ar; North Pacific; Northeast Pacific; Northwest, Pacific; Oceania; Pacific Ocean; Paleogene; Polynesia; seamounts;, Tertiary; tholeiitic; United States; volcanic; volcanic rocks;, volcanism; West Pacific; whole rock, 03, Geochronology |
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Publisher
Elsevier Science
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