期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 117, 期 24, 页码 13283-13293出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2002619117
关键词
biogeochemistry; origins of life; hydrogen; Mid-Ocean Ridge; microbes
资金
- NSF
Free hydrogen (H-2) is a basal energy source underlying chemosynthetic activity within igneous ocean crust. In an attempt to systematically account for all H-2 within young oceanic lithosphere (<10 Ma) near the Mid-Ocean Ridge (MOR), we construct a box model of this environment. Within this control volume, we assess abiotic H2 sources (similar to 6 x 10(12) mol H-2/y) and sinks (similar to 4 x 10(12) mol H-2/y) and then attribute the net difference (similar to 2 x 10(12) mol H-2/y) to microbial consumption in order to balance the H-2 budget. Despite poorly constrained details and large uncertainties, our analytical framework allows us to synthesize a vast body of pertinent but currently disparate information in order to propose an initial global estimate for microbial H-2 consumption within young ocean crust that is tractable and can be iteratively improved upon as new data and studies become available. Our preliminary investigation suggests that microbes beneath the MOR may be consuming a sizeable portion (at least similar to 30%) of all produced H-2, supporting the widely held notion that subseafloor microbes voraciously consume H-2 and play a fundamental role in the geochemistry of Earth's ocean-atmosphere system.
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