@article{oai:kitami-it.repo.nii.ac.jp:02000417,
 author = {Akihiro Hachikubo and Hirotsugu Minami and Satoshi　Yamashita and Andrey Khabuev and Alexey Krylov and Gennadiy Kalmychkov and Jefrey Poort and Marc De Batist and Alexandr Chenskiy and Andrey Manakov and Oleg Khlystov},
 journal = {Scientific Reports},
 month = {Sep},
 note = {We reported the characteristics of hydrate-bound hydrocarbons in lake-bottom sediments at the Kedr 
mud volcano in Lake Baikal. Twenty hydrate-bearing sediment cores were retrieved, and methanestable isotopes of hydrate-bound gases (δ13C and δ2
H of − 47.8‰ to− 44.0‰ V-PDB and− 280.5‰ 
to− 272.8‰ V-SMOW, respectively) indicated their thermogenic origin accompanied with secondary 
microbial methane. Powder X-ray difraction patterns of the crystals and molecular composition of 
the hydrate-bound gases suggested that structure II crystals showed a high concentration of ethane 
(around 14% of hydrate-bound hydrocarbons), whereas structure I crystals showed a relatively low 
concentration of ethane (2–5% of hydrate-bound hydrocarbons). These diferent crystallographic 
structures comprised complicated layers in the sub-lacustrine sediment, suggesting that the gas 
hydrates partly dissociate, concentrate ethane and form structure II crystals. We concluded that a high 
concentration of thermogenic ethane primarily controls the crystallographic structure of gas hydrates 
and that propane, iso-butane (2-methylpropane) and neopentane (2,2-dimethylpropane) are encaged 
into crystals in the re-crystallisation process},
 title = {Characteristics of hydrate-bound gas retrieved at the Kedr mud volcano (southern Lake Baikal)},
 volume = {10},
 year = {2020}
}