Petrology and age of alkalic lava from the Ratak Chain of the Marshall Islands
Journal of Geophysical Research
By: A. S. Davis, M. S. Pringle, L.-B.G. Pickthorn, D. A. Clague, and W. C. Schwab
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Abstract
Volcanic rock dredged from the flanks of four volcanic edifices in the Ratak chain of the Marshall Islands consist of alkalic lava that erupted above sea level or in shallow water. Compositions of recovered samples are predominantly differentiated alkalic basalt and hawaiite but include strongly alkalic melilitite. Whole rock 40Ar/39Ar total fusion and incremental heating ages of 87.3 ?? 0.6 Ma and 82.2 ?? 1.6 Ma determined for samples from Erikub Seamount and Ratak Guyot, respectively, are within the range predicted by plate rotation models but show no age progression consistent with a simple hot spot model. Variations in isotopic and some incompatible element ratios suggest interisland heterogeneity. -from Authors
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Petrology and age of alkalic lava from the Ratak Chain of the Marshall Islands |
| Series title | Journal of Geophysical Research |
| Volume | 94 |
| Issue | B5 |
| Year Published | 1989 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geophysical Research |
| First page | 5757 |
| Last page | 5774 |
| Google Analytic Metrics | Metrics page |