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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Cores collected during Leg 62 of the Deep Sea Drilling Project recovered organic-rich rocks of early Aptian age in the Mid-Pacific Mountains and of late Albian age on the southern Hess Rise. Concentrations of organic carbon in these rocks range from a few tenths of 1% to more than 9%. The organic-rich strata in the Mid-Pacific Mountains are in a 45-m-thick sequence of carbonaceous and tuffaceous limestone that lies on interbedded
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pelagic limestones and clastic limestones containing locally derived shallow-water carbonate debris. The carbonaceous-tuffaceous sequence is overlain by cyclic interbeds of green, gray, and pink limestone. The organic-rich strata on southern Hess Rise are dark-olive laminated limestone with a few clay-rich intervals that may contain altered volcanic ash. The association of volcanogenic sediments with organic-rich strata on Hess Rise is not as striking as in the Mid-Pacific Mountains, but the occurrences do suggest a coincidence of mid-plate volcanic activity and accumulation of organic matter at intermediate water depths in the tropical North Pacific during the middle Cretaceous. These organic-rich rocks are equivalent in age to organic-rich lithofacies elsewhere in the world ocean. >
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