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橄榄岩的蛇纹石化过程可驱动热液系统并产生CH_4和氢气,并为生物体提供能量和电子来源的分子氢。对蛇纹石化气体的研究,可为非生物成因CH_4的形成提供证据,也具备有利的有机化合物合成条件,进而探索地球生命起源。本文采用分步加热质谱法测定了内蒙古温都尔庙地区蛇纹石化橄榄岩(大理岩)气体化学组成和碳同位素组成,结果表明,CO_2占有极高的比例,N_2和H_2的含量较高,CH_4和C_2H_6在400~600℃温度段释出含量较高。CO_2的δ~(13)C为-18.6‰~2.6‰,CH_4的δ~(13)C_1为-8.1‰~-51.8‰,CH_4、C_2H_6、C_3H_8和C_4H_(10)的碳同位组成随着碳数增加具有正序分布,完全反序和局部反序的分布特征,显示气体来源具有多样性,具有非生物成因气和生物成因气(热成因或细菌)的来源。
The serpentinization process of peridotites drives hydrothermal systems and produces CH 4 and hydrogen, as well as providing molecular energy and electronic sources of molecular hydrogen to organisms. The study of serpentinization gas can provide evidence for the formation of non-biological CH 4, and also has favorable synthesis conditions for organic compounds, thus exploring the origin of life on earth. In this paper, the chemical composition and carbon isotopic composition of serpentinized peridotite (marble) in the Wenduermiao area of Inner Mongolia were determined by the method of step-heating mass spectrometry. The results showed that CO 2 occupy a very high proportion and the contents of N 2 and H 2 are high, CH_4 and C_2H_6 were higher in the temperature range of 400 ~ 600 ℃. The δ13C of CO_2 was -18.6 ‰ ~ 2.6 ‰, the δ13C_1 of CH_4 was -8.1 ‰ ~ -51.8 ‰, and the carbon isotopic compositions of CH_4, C_2H_6, C_3H_8 and C_4H_10 were similar to those of carbon The increase in the number distribution has a positive sequence distribution, complete reverse sequence, and partial reverse sequence distribution, indicating a diversity of gas sources, with sources of abiotic gas and biogenic gas (pyrogenic or bacterial).