Reply to comment on "Origin of methane in serpentinite-hosted hydrothermal systems: The CH4-H2-H2O hydrogen isotope systematics of the Hakuba Happo hot spring" by Suda et al. [Earth Planet. Sci. Lett. 386 (2014) 112-125]
Reply to comment on "Origin of methane in serpentinite-hosted hydrothermal systems: The CH4-H2-H2O hydrogen isotope systematics of the Hakuba Happo hot spring" by Suda et al. [Earth Planet. Sci. Lett. 386 (2014) 112-125]
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回复 Suda 等人对“蛇纹岩热液系统中甲烷的起源：白马八方温泉的 CH4-H2-H2O 氢同位素系统学”的评论。
DOI：
10.1016/j.epsl.2014.06.005
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发表时间：
2014
影响因子：
5.3
通讯作者：
Maruyama S
中科院分区：
文献类型：
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作者：
Suda K;Ueno Y;Yoshiazaki M;Nakamura H;Kurokawa K;Nishiyama E;Yoshino K;Hongoh Y;Kawachi K;Omori S;Yamada K;Yoshida N;Maruyama S
首先，我们感谢Whiticar和Etiope的评论，并欢迎有机会澄清我们的解释，即根据CH 4-H2-H2O氢同位素系统学，白马八宝CH 4不太可能由H2作为氢源产生。Whiticar和Etiope在他们的评论中指出：（1）实验测定的CH 4-H2分馏并不一定代表自然体系中FTT反应产生的分馏，因为FTT反应过程中CH 4和H2之间的氢同位素分馏在低于实验条件的温度下会更大（> 200 ℃）;（2）甲烷生成反应后，氢的原始δD值可能发生了变化，目前尚不清楚。因此，将观察到的CH 4-H2分馏与先前的实验室实验进行比较是无效的。首先，已经在高温（> 200 ° C）下通过实验确定了FTT合成的氢同位素分馏（Fu等人，2007; McCollom等人，2010; Taran等人，2010年）。在较低的温度下，同位素分馏可能不同于
First of all we thank Whiticar and Etiope for their comment and welcome the opportunity to clarify our interpretation that the Hakuba Happo CH4 is unlikely to have been produced from H2 as a source of hydrogen based on the CH4–H2–H2O hydrogen isotope systematics. In their comment, Whiticar and Etiope pointed (1) experimentally-determined CH4–H2 fractionation does not necessarily represent those produced by FTT reaction in natural system, because the hydrogen isotope fractionation between CH4 and H2 during FTT reaction would be larger at lower temperature than the experimental conditions (> 200◦ C);(2) the original δD value of hydrogen may have been changed after CH4-producing reaction and still unknown. Therefore, comparison of the observed CH4–H2 fractionation to previous laboratory experiment is invalid. First, hydrogen isotope fractionation of FTT synthesis has been experimentally determined at high temperature (> 200◦ C)(Fu et al., 2007; McCollom et al., 2010; Taran et al., 2010). At lower temperature, the isotopic fractionation may possibly differ from the