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. 2015 Mar 20;6:200. doi: 10.3389/fmicb.2015.00200

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Copyright © 2015 Gründger, Jiménez, Thielemann, Straaten, Lüders, Richnow and Krüger.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Genetic diagrams for gasses of different samples: carbon isotopic composition of natural methane and CO₂ in groundwater samples from deep aquifers of coal-rich sedimentary basin and sediments (A). Hydrogen vs. carbon isotopic composition of methane (δ¹³C_CH4 and δD_CH4) of natural methane in groundwater samples (B). Zoning after Schoell (1980, 1983) and Whiticar et al. (1986). VPDB, Vienna PeeDee Belemnite; SMOW, Standard Mean Ocean Water.