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DOI | 10.1038/s41561-019-0509-1 |
Iron-oxidizer hotspots formed by intermittent oxic-anoxic fluid mixing in fractured rocks | |
Bochet, Olivier1; Bethencourt, Lorine2; Dufresne, Alexis2; Farasin, Julien1; Pedrot, Mathieu1; Labasque, Thierry1; Chatton, Eliot1; Lavenant, Nicolas1; Petton, Christophe1; Abbott, Benjamin W.2,3; Aquilina, Luc1; Le Borgne, Tanguy1 | |
2020-01-06 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2020 |
卷号 | 13期号:2页码:149-+ |
文章类型 | Article |
语种 | 英语 |
国家 | France; USA |
英文摘要 | Subsurface environments host most of the fresh water on Earth as well as diverse microorganisms that may constitute a significant part of the biosphere. However, the dynamics and spatial distribution of subsurface microorganisms and their response to hydrological processes are poorly understood. Here we used chemical and metagenomic analyses of groundwater in a fractured rock aquifer in western France to determine the role of fractures in the formation of deep microbial hotspots in the subsurface. The majority of fractures, sampled in a 130-m-deep borehole, were anoxic, but a fracture carrying oxic groundwater was detected at 54-m depth, associated with a fivefold increase in the abundance of iron-oxidizing bacteria. We developed a mechanistic model of fluid flow and mixing in fractures and found that such microbial hotspots are sustained by the mixing of fluids with contrasting redox chemistries at intersections of fractures. The model predicts that metre-scale changes in near-surface water table levels cause intermittent oxygen delivery through deep fractures, which can extend the depth of the habitable zone for iron-oxidizing bacteria hundreds of metres into the subsurface. Given that fractures are ubiquitous at multiple scales in the subsurface, such deep microbial hotspots may substantially influence microbial communities and their effect on Earth's biogeochemical cycles. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000519214500012 |
WOS关键词 | MICROBIAL COMMUNITIES ; LIFE ; DEEP ; FLOW ; TRANSPORT ; SINGLE ; ZONE ; INTERFACE ; BOREHOLE ; BACTERIA |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/249409 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Rennes, CNRS, UMR 6118, Geosci Rennes, Rennes, France; 2.Univ Rennes, CNRS, Ecobio, UMR 6553, Rennes, France; 3.Brigham Young Univ, Dept Plant & Wildlife Sci, Provo, UT 84602 USA |
推荐引用方式 GB/T 7714 | Bochet, Olivier,Bethencourt, Lorine,Dufresne, Alexis,et al. Iron-oxidizer hotspots formed by intermittent oxic-anoxic fluid mixing in fractured rocks[J]. NATURE GEOSCIENCE,2020,13(2):149-+. |
APA | Bochet, Olivier.,Bethencourt, Lorine.,Dufresne, Alexis.,Farasin, Julien.,Pedrot, Mathieu.,...&Le Borgne, Tanguy.(2020).Iron-oxidizer hotspots formed by intermittent oxic-anoxic fluid mixing in fractured rocks.NATURE GEOSCIENCE,13(2),149-+. |
MLA | Bochet, Olivier,et al."Iron-oxidizer hotspots formed by intermittent oxic-anoxic fluid mixing in fractured rocks".NATURE GEOSCIENCE 13.2(2020):149-+. |
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