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GCR Display Cores
Ontong Java Plateau
Leg 130 was chosen to provide a depth transect of carbonate deposition in the western equatorial Pacific. Our intend was to recover a complete record of Neogene, Paleogene and Late Cretaceous ocean history along this transect, with the goal of achieving a detailed reconstruction of paleoceanography and paleoclimate in a well-constrained time frame.
Site 807 water depth
Site 807 Objectives
Limestone with variable amount of silica cement. The sediment is moderately to highly bioturbated with mm to cm scale subhorizontal, compacted burrows. Dark reddish gray chert is present as fragments of continuous layers up to 6 cm thick and as irregularly shaped masses in limestone pieces. Limestone with volcanic ash is present at 3, 27, and 134cm (K/T boundary).
Upper Maastrichtian/Lower Paleocene. Biostratigraphic data place the K/T boundary at the volcanic ash layer at 134 cm.
The upper 100 meters of Subunit IIB is composed of bioturbated limestone, which probably originated as pelagic carbanate sediment with isolated interbeds of mass-flow deposited material.
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Modified on Friday, 26-Sep-2008 12:39:11 CDT.