[MIS11-02] Exploring the World’s Largest LIP: Testing the Ontong Java Nui hypothesis
Keywords:LIPs, magma, basalt
The OJP is divided into the High Plateau to the west and the Eastern Salient to the east and is presently the best sampled among Pacific oceanic plateaus. The basaltic basement of the OJP has been sampled by seven Deep Sea Drilling Project (DSDP Site 289) and Ocean Drilling Program (ODP Sites 289, 803, 807, 1183, 1185, 1186, and 1187) sites –but they are concentrated only in the High Plateau. In order to examine the true extent of the OJP (i.e., whether the flows or sills in the Nauru, East Mariana, and Pigafetta basins, as well as those from the Manihiki, and Hikurangi plateaus are parts of the Ontong Java Nui volcanism), we propose drilling at five sites on the Eastern Salient and adjacent basins to recover basement samples. We also propose drilling through the sedimentary section on the Magellan Rise, a small plateau that formed >20 Myr before the proposed Ontong Java Nui emplacement. Because of its older age, the sedimentary sequence on Magellan Plateau may preserve ash layers that cover all Ontong Java related eruption events.