MOLECULAR GEOCHEMISTRY OF THE DISPERSED ORGANIC MATTER IN THE LATE CENOZOIC SEDIMENTS OF THE LAPTEV SEA CONTINENTAL MARGIN AND ADJACENT PART OF THE ARCTIC OCEAN
V.I. Petrova, G.I. Batova, A.V. Kursheva, I.V. Litvinenko, I.P. Morgunova
FSBI "VNIIOceangeologia", Angliiskii pr. 1, St. Petersburg, 190121, Russia
Keywords: Bottom sediments, geochemistry, organic matter, hydrocarbon molecular markers, Arctic Ocean
Abstract
The main factors controlling the bulk sedimentation in the region of the Siberian segment of the Lomonosov Ridge (axial part and western slope) and the Laptev Sea continental margin during the late Cenozoic were studied using a complex of geomorphological, lithological, and organic geochemical data. Samples for the study were collected during the cruises of R/V Akademik Fedorov in 2005 and 2007 and nuclear icebreaker Rossiya in 2007. Analysis of the group and molecular composition of the dispersed organic matter (DOM) in bottom sediments has shown that the input of terrigenous sediments enriched in the products of abrasion of lithified rocks determines sedimentation process on the continental slope of the Laptev Sea and in the Amundsen Basin. The individual characteristics of the DOM of the late Cenozoic sediments from the Lomonosov Ridge reflect the wide diversity of sedimentary sources and depositional environments. Subaqueous erosion of edaphogenic products and pre-Holocene sediments play an important part in sedimentation together with terrigenous flow and ice transport.
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