Geochemical anomalies of hydrocarbon gases in bottom sediments of eostructures of the Laptev-Siberian transition zone of the East Arctic shelf

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Abstract

The data of gas geochemical studies of bottom sediments of the Laptev-Siberian transition zone are presented. The established isotope-geochemical indicators determine the dominance of epigenetic hydrocarbon gases of various gas sources in the sediments. Methane concentrations up to 8.3047 cm3/ kg and the sum of its homologues up to 0.0260 cm3/kg indicate the formation of hydrocarbon anomalies exceeding the anomaly criteria for Arctic shelf sediments by 166 and 26 times. The main geological factors for the formation and distribution of anomalies in the bottom sediments of the Laptev-Siberian transition zone are the high gas content of the underlying sediments and gas sources, fold and fault tectonics, geostructural position, seismic activity and depth of occurrence of hydrocarbon sources.

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A. I. Gresov

Il’ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences

Author for correspondence.
Email: gresov@poi.dvo.ru
Russian Federation, Vladivostok

A. V. Yatsuk

Il’ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences

Email: yatsuk@poi.dvo.ru
Russian Federation, Vladivostok

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2. Fig. 1. Structural and tectonic map of the study area [3, 4]: 1 – first-order geostructures: troughs: 1 – Novosibirsk, 2 – Belkovsko-Svyatonossky, 3 – Omoloysky, 4 – Anisinsky; graben-rift: 5 – Severo-Omoloysky; uplifts: 6 – East Laptevskoye, 7 – Kotelnicheskoye, 8 – Reshetnikovskoye; horsts: 9 – Stolbovskoy, 10 – Belkovsky; structural terraces: 11 – Shelonskaya, 12 – Blagoveshchenskaya; 13 – Sannikovskaya saddle. 2 – tectonic faults: a – reliable, b – inferred. 3 – isobaths, m. 4 – earthquake epicenters (according to USGS Earthquake Hazards Program). 5 – isohypses of sedimentary cover thickness, km. 6 – bottom stations with concentrations of hydrocarbon gases in sediments: < 0.05 (a), 0.05–0.25 (b), 0.25–0.50 (c), 0.50–1.00 (d) and > 1.00 cm3/kg (d). Station numbers of coastal expeditions and ship sampling on-site – 49–82; cruises LV83 and LV90 of the R/V “Akademik M. A. Lavrentyev” – 83–4–83–36 and 90–25. Yu-A – South Anyui Suture.

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