AGE OF MUD BRECCIA FROM MUD VOLCANOES IN ACADEMICIAN RIDGE, LAKE BAIKAL

Geodinamika i Tektonofizika

A. V. Khabuev¹  S. Yamashita²  A. Hachikubo²  H. Minami²  N. A. Gubin³  S. S. Vorobyeva³  A. G. Chenskiy⁴  O. M. Khlystov⁴  M. De Batist⁵  L. Nauds⁵ 

[1] Royal Belgian Institute of Natural Sciences – Operational Directorate Natural Environment (RBINS – OD Nature);Environmental and Energy Resources Research Center, Kitami Institute of Technology;Irkutsk National Research Technical University;Limnological Institute, Siberian Branch of RAS;Renard Centre of Marine Geology (RCMG), University of Ghent;

关键词: mud volcano;    mud volcanic breccia;    gas hydrate;    diatom analysis;    biostratigraphy;    seismic stratigraphy;    lake baikal;   

DOI  :  10.5800/GT-2017-8-4-0324

来源: DOAJ

【 摘 要 】

LakeBaikalis the only freshwater reservoir on Earth with gas-hydrate accumulations in its bottom sediments, partly due to the activity of mud volcanoes. This paper describes a group of mud volcanoes recently discovered on the slope of the Academician Ridge between the northern and central LakeBaikalbasins. Our analysis of diatom skeletons in the mud breccia sampled from the study area shows a high abundance of Cyclotella iris et var. These extinct species were also discovered in a core sample from BDP-98 borehole. Based on the biostratigraphic and seismostratigraphic correlations, the age of the mud breccia in the studied mud volcanoes ranges from the Late Miocene to the Early Pliocene (4.6 to 5.6 Ma). The correlations suggest that the material originated from a depth of less than310 m below the lake bottom.

【 授权许可】

Unknown