Trace element abundances in basalts of Nauru Basin
| Autor: | Rodey Batiza, S. A. Shcheka, Roger L. Larson, S. O. Schlanger, H. Tokuyama |
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| Rok vydání: | 1980 |
| Předmět: | |
| Zdroj: | Nature. 286:476-478 |
| ISSN: | 1476-4687 0028-0836 |
| DOI: | 10.1038/286476a0 |
| Popis: | Leg 61 of the Deep Sea Drilling Project (DSDP) was concerned with drilling a single continuously cored multiple re-entry hole at site 462 in the Central Nauru Basin (Fig. 1). Preliminary results of this drilling, which penetrated more than 1 km beneath the sea floor, were presented earlier1,2. One major result was the discovery of a late Cretaceous off-ridge volcanic/intrusive complex of basaltic composition and great thickness (>500 m). We now present trace element abundance data for these basalts. Results of the drilling provide further support for a relatively long-lived thermal and magmatic event in the late Cretaceous resulting in voluminous and widespread magmatism in the central and western Pacific consistent with earlier suggestions3–5. The trace element data show that most of the rocks produced during this event have trace element characteristics intermediate between those of normal and transitional mid-ocean ridge basalts (N- and T-type MORB)6 and different from Hawaiian basalts7. These results indicate that basalts which are depleted in light rare earth elements (LREE) relative to the heavy REE may, in certain conditions, be erupted as voluminous intra-plate eruptions far from active ridge crests. |
| Databáze: | OpenAIRE |
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