期刊
CHEMICAL GEOLOGY
卷 583, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.chemgeo.2021.120449
关键词
Energetics; Chemolithotroph; Terrestrial hydrothermal system; Shallow-sea hydrothermal system; Deep-sea hydrothermal system
资金
- Center for Dark EnergyBiosphere Investigations (C-DEBI), an NSF [OCE0939564]
- NASA Astrobiology Institute -Life Underground (NAI-LU) grant [NNA13AA92A]
- USC Zumberge Fund Individual Grant
- NASA-NSF Origins of Life Ideas Lab program [NNN13D466T]
- Alfred P. Sloan Foundation through the Deep Carbon Observatory
- NASA Habitable Worlds [80NSSC20K0228]
By calculating the Gibbs energy from redox reactions in various hydrothermal systems worldwide, the study reveals trends in energy availability for microbial ecosystems, identifying reactions that yield the highest energy and the differences between shallow-sea and deep-sea hydrothermal systems.
Chemolithotrophic microorganisms are key primary producers in hydrothermal environments. However, the complex thermal and compositional gradients that frequently describe these settings commonly obfuscate which reactions are fueling such complex ecosystems. Nonetheless, potential sources of microbial energy can be identified by combining analytical geochemical data from hydrothermal systems and thermodynamic calculations. This approach provides a quantitative assessment of how habitats are shaped by environmental conditions such as temperature, pressure, pH and the concentrations of electron donors and acceptors. In this study, we have calculated the Gibbs energy available from 730 redox reactions in 30 terrestrial, shallow-sea, and deep-sea hydrothermal systems around the world (326 geochemical datasets) to reveal trends in how energy availability can shape hydrothermal ecology. The most energy-yielding (exergonic) reactions were predominantly the reduction of O, and MnO2 and the oxidation of Fe2+, pyrite, CO, and CH4. In contrast, the reduction of N2, CO, and CO2 and oxidation of N2, Mn, and NO, though still often exergonic, yielded significantly less energy. Also, our results show that, in terms Gibbs energies of reactions, shallow-sea hydrothermal vent systems are more like terrestrial hot springs than deep-sea hydrothermal systems. Per kilogram of water in hydrothermal fluid, energy yields from inorganic redox reactions are much higher in deep-sea hydrothermal systems than in the other systems considered here. Our results provide a comprehensive view of the distribution of energy supplies from redox reactions in high-temperature ecosystems on a global scale.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据