Dataset description
We provide below the full data set used by Bochet et al. (2020) published in Nature Geoscience (DOI). This study aims to investigate the role of fractures in the formation of deep microbial hot spots. The data was acquired in the Ploemeur fractured rock observatory, which is part of the French network of hydrogeological observatories H+ (http://hplus.ore.fr/en/). Most of measurements were performed in the PZ26 borehole and in the Guidel area.
The data may be downloaded from the links below by creating a login and a password on the H+ database at http://hplus.ore.fr/en/database/acces-database.
The full dataset of the Ploemeur fractured rock observatory is available from https://hplus.ore.fr/en/ploemeur/.
Download links
| Chemistry |
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| Field measurements: PZ26 (conductivity, dissolved oxygen, pH, Eh) Ions concentration: PZ26 Gaz concentration: PZ26 Batchs: PZ26 |
| Borehole logs |
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| Optical and acoustical logs: PZ26 Fracture log: PZ26 Caliper: PZ26 Borehole inclination: PZ26 |
| O2 and Temperature logs |
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| O2 logging: PZ26, dry and recharge periods O2 logging Guidel: PSR1, PSR2, PZ15, PZ19, PZ21, PZ22, PZ23, PZ24, PZ25, PZ26, PZ2 T logging: PZ26, dry and recharge periods |
| Microbiology in fractures |
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| Metagenomic: PZ26 |
| Flow in borehole and piezometric head |
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| Flowmeter data in borehole: PZ26 Piezometric head: PZ15 and PZ23 |
Note that, due to the inclination of the PZ26 borehole (see borehole inclination file above), depths estimated from pressure measurements differ slightly from those estimated from the distance along borehole. In the temperature and O2 log files above, the depth is estimated from pressure measurements, while in the other files it is estimated from the distance along borehole. In the paper, all depths refer to distance along borehole.
Model
We provide below the Matlab code developed to simulate the depth of the habitable zone for iron oxidizing bacteria. The model quantifies the evolution of oxygen concentration with depth through first order degradation and dilution at intersection with anoxic fractures.
Matlab code – Fracture mixing model