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Geological Society, London, Special Publications; 2004; v. 229; p. 275-306;
DOI: 10.1144/GSL.SP.2004.229.01.16
© 2004 Geological Society of London

Volcaniclastic Rocks

Accretionary-lapilli-bearing pyroclastic rocks at ODP Leg 192 Site 1184: a record of subaerial phreatomagmatic eruptions on the Ontong Java Plateau

Thor Thordarson1,2

1 Department of Geology and Geophysics, School of Ocean and Earth Sciences and Technology, University of Hawaii at Manoa, Manoa, HI 96822, USA moinui{at}soest.hawaii.edu
2 Science Institute, University of Iceland, Dunhagi 6, Reykjavík, IS101, Iceland torvth{at}hi.is

Detailed analysis of lithologies and lithofacies associations within the 337.7 m thick basement volcaniclastic succession, recovered during Ocean Drilling Program (ODP) Leg 192 at Site 1184 on the Ontong Java Plateau, shows that in bulk it is made up of pyroclastic deposits of phreatomagmatic origin. The succession is essentially made up of two lithologies: lapilli tuff (59% of the total recovered core length) and tuff (34%), consisting almost entirely of juvenile clasts (>97%) and containing significant amounts of matrix-supported accretionary and/or armoured lapilli clasts. The evidence indicates that the succession was formed by at least six (and perhaps as many as 10) major phreatomagmatic eruptions that were subaerial and associated with the main phase of volcanism on the Ontong Java Plateau.