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- W2083942469 abstract "Sediments of late Pliocene to Recent age from two abyssal sites at 41°N latitude (ODP Site 898 in the eastern Atlantic Ocean and ODP Site 1179 in the western Pacific Ocean) generally contain sparse palynomorph assemblages dominated by oxidation-resistant gonyaulacacean dinoflagellate cysts. Some samples at both sites had unexpectedly high palynomorph concentrations, high P:D (pollen:dinoflagellate cyst) and low G:P (gonyaulacacean:protoperidiniacean) values. These samples record an increase in terrigenous flux and in the rate of sedimentation. Sedimentological data from ODP Hole 898A support the interpretation of pollen and protoperidiniacean dinoflagellate cyst-rich calcareous sandy muds as distal turbidites. We suggest that palynological analysis is more accurate than sediment grain size in distinguishing distal turbidites from pelagites. Similar palynological assemblages in biosiliceous oozes at Site 1179 have a different origin. The close correlation of peaks in total palynomorph concentration with anomalous preservation of protoperidiniacean dinoflagellate cysts as well as biogenic calcium carbonate 1 km below the modern CCD suggests a link between terrigenous flux and sea surface productivity. The increased flux of biogenic particles (including planktonic foraminiferal tests) driven by the increased availability of continentally derived limiting nutrients in oceanic waters appears mainly responsible for the increased sedimentation rate which allows oxidation-susceptible dinoflagellate cysts and dissolution-susceptible calcareous microfossils to be preserved. The ages of these palynomorph-rich calcareous intervals at this and several other nearby sites in the western North Pacific suggest that the resulting sequestration of both organic and inorganic carbon affected the greenhouse effect sufficiently to drive late Cenozoic global cooling." @default.
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- W2083942469 date "2004-01-01" @default.
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- W2083942469 title "The palynological record of terrigenous flux to the deep sea: late Pliocene–Recent examples from 41°N in the abyssal Atlantic and Pacific oceans" @default.
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- W2083942469 doi "https://doi.org/10.1016/s0034-6667(03)00113-1" @default.
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