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Boreskov

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PP‐40BIOMARKER HYDROCARBONS OF THE LOWER PROTEROZOICOF THE KODAR‐UDOKAN TROUGH (THE ALDAN SHIELD)Timoshina I.D., Fursenko E.A.Institute of Petroleum Geology and Geophysics SB RAS, Prosp. Akad. Koptyuga 3,Novosibirsk, 630090, Russia; fax: 8(383)3332301; e‐mail: TimoshinaID@ipgg.nsc.ruLower Proterozoic (1.86 Ga) organic matter (OM) in the Kodar‐Udokan trough of theAldan shield was found to be strongly metamorphosed, as evidenced by isotopically heavycarbon ( 13 С of insoluble OM ranging from ─29.5 to ─27.0‰), have the TOC values of 0.03‐0.05% and a low chloroform‐extractable bitumen content (0.0009‐0.0015%), mostly resins(64.0‐83.6%). The (fig. 1) results ofbiogeochemical studies suggest thatthis OM is aquatic, planktonic andbacteriogenic in origin, as indicated bythe distributions of normal alkanes(nC 27 /nC 17

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