Affiliation:
1. Limnological Institute, Siberian Branch of the Russian Academy of Sciences
Abstract
An integrated study of mud volcanoes in the World Ocean is important for making assessment of potential geological-ecological disasters caused by rapid large-volume gas discharge into the water column and mud volcano eruptions at the bottom. The study of mud-volcanic activity in the past and determination of its periodicity are pioneering for the Baikal. The mud volcanoes and other hydrate-bearing structures are largely concentrated in the Middle Baikal basin along the tectonic faults. The most representative example of these phenomena is the "Gydratny" fault, four of six structures along which are mud volcanoes. An integrated geological-geophysical study (seismoacoustic and hydroacoustic sounding and geological sampling) of the "Novosibirsk" mud volcano, the largest and well-pronounced feature of the lake bottom relief, confirmed its structural identity with classical submarine mud volcanoes. The "Novosibirsk" mud volcano possesses all major elements of other single hydrate-bearing mud volcanoes of the lake which include volcanic cone in the bottom relief, vertical acoustically not transparent feeding channel, mud-volcanic breccia, gas saturation, and gas hydrates. This makes it one of the reference hydrate-bearing mud volcanic-type structures of Lake Baikal.The analysis of the bottom hydroacoustic profiling yielded evidence of the Late Pleistocene mud-volcanic eruptions shaped as two layers-flows at sub-bottom depths of 15 and 26 m (30 and 50 kyr ago, respectively). The presence of mud-volcanic breccia beneath the thin Holocene diatomic silt deposits testifies to the Holocene mud volcano activation due to the warm fluid rising from the depths to the volcano roots along the active segment of the tectonic fault in accordance with the model of the "Baikal-type" mud volcanism. Using the "Novosibirsk" mud volcano and the "Gydratny" fault as an example, it can be shown that the past tectonic activity of the Baikal basin may be determined based on the knowledge of the structure and evolution of the mud volcanoes of the lake.
Publisher
Institute of Earth's Crust, Siberian Branch of the Russian Academy of Sciences
Reference15 articles.
1. Aliyev A.I., 2006. Mud Volcanoes – Centers of Periodic Discharging of Fast Plunging Sedimentary Basins and Important Criteria of Gas Potential Prognosis of Large Depths. Russian Oil and Gas Geology 5, 26–32 (in Russian) [Алиев А.И. Грязевые вулканы – очаги периодической газогидродинамической разгрузки быстропогружающихся осадочных бассейнов и важные критерии прогноза газоносности больших глубин // Геология нефти и газа. 2006. № 5. С. 26–32].
2. Colman S.M., Jones G.A., Rubin M., King J.W., Peck J.A., Orem W.H., 1996. AMS Radiocarbon Analyses from Lake Baikal, Siberia: Challanges of Dating Sediments from a Large, Oligotrophic Lake. Quaternary Science Reviews 15 (7), 669–684. https://doi.org/10.1016/0277-3791(96)00027-3.
3. Cuylaerts M., Naudts L., Casier R., Khabuev A.V., Belousov O.V., Kononov E.E., Khlystov O.М., De Batist M., 2012. Distribution and Morphology of Mud Volcanoes and Other Fluid Flow-Related Lake-Bed Structures in Lake Baikal, Russia. Geo-Marine Letters 32, 383–394. https://doi.org/10.1007/s00367-012-0291-1.
4. De Batist M., Klerkx J., Van Rensbergen P., Vanneste M., Poort J., Golmshtok A., Kremlev A., Khlystov O., Krinitsky P., 2002. Active hydrate destabilization in Lake Baikal, Siberia? Terra Nova 14, 436–442. https://doi.org/10.1046/j.1365-3121.2002.00449.x.
5. Dimitrov L., 2002. Mud Volcanoes – The Most Important Pathway for Degassing Deeply Buried Sediments. Earth-Science Reviews 59 (1–4), 49–76. https://doi.org/10.1016/S0012-8252(02)00069-7.