Methane with Abnormally High δ13C and δD Values from the Coastal Hot Springs in Lake Baikal

Methane with Abnormally High δ13C and δD Values from the Coastal Hot Springs in Lake Baikal
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来自贝加尔湖沿岸温泉的 δ13C 和 δD 值异常高的甲烷

DOI:
10.1134/s0024490220040033
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发表时间:
2020
影响因子:
0.8
通讯作者:
Khlystov O. M.
Khlystov O. M.
中科院分区:
地球科学4区
文献类型:
--
作者:
Kalmychkov G. V.;Hachikubo A.;Pokrovsky B. G.;Minami H.;Yamashita S.;Khlystov O. M.

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本文研究了贝加尔湖沿岸Kotelnikovsky、Zmeiny和Goryachnisky温泉烃类气体的组成和同位素特征(δ 13 C和δD)。最令人感兴趣的是位于东海岸的兹迈尼泉,那里的甲烷具有异常高的δ 13 C(高达+11‰)和δD(高达+267‰)。这些值与微生物甲烷氧化过程中碳和氢同位素的分馏有关。Goryachinsky泉的δ 13 C-C1值为1.402 ‰,可正式指示甲烷的热成因。然而,由于甲烷氧化,该泉的碳同位素组成更有可能发生变化,因为Goryachinsky泉的气体含有微生物甲烷作为混合物。在贝加尔湖西北部的Kotelnikovsky泉中记录了未被二次氧化扭曲的微生物气体的典型同位素特征(δ 13 C-C1 = 161.5 ‰,δD-C1= 1230.2 ‰,δ 13 C-C2 = 156.6 ‰)。
AbstractWe studied the composition and isotopic characteristics (δ13C and δD) of hydrocarbon gases from the Kotelnikovsky, Zmeiny, and Goryachnisky hot springs located in the coastal zone of Lake Baikal. Of greatest interest is the Zmeiny Spring located on the eastern coast, where the methane has abnormally high values of δ13C (up to +11‰) and δD (up to +267‰). These values are related to the fractionation of carbon and hydrogen isotopes during the oxidation of microbial methane. The δ13C-C1value (‒40.2‰) in the Goryachinsky Spring can formally indicate the thermogenic origin of methane. However, the modification of carbon isotope composition in this spring due to methane oxidation is more likely, because gas from the Goryachinsky Spring contains the microbial methane as admixture. Isotopic characteristics typical of microbial gases undistorted by secondary oxidation (δ13C-C1= ‒61.5‰, δD-C1= ‒230.2‰, δ13C-C2= ‒56.6‰) are recorded in the Kotelnikovsky Spring northwest of Lake Baikal.
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