We provide below the full data set used by Bochet et al. (2020) published in Nature Geoscience. 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+ ( 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 logging and a password on the H+ database at

The full dataset of the Ploemeur fractured rock observatory is available from , and



Field measurements : PZ26 (conductivity, dissolved oxygen, pH, Eh)

Ions concentration : PZ26

Gaz concentration : PZ26

Batchs : PZ26

Borehole logs

Optical and acoustical logs : PZ26

Fracture log : PZ26

Caliper : PZ26

Borehole inclination : PZ26

O2 and Temperature logs

O2 logging : PZ26, dry and recharge periods

O2 logging Guidel : PSR1, PSR2, PZ15, PZ19, PZ21, PZ22, PZ23, PZ24, PZ25, PZ26, PZ2

Temperature logging : PZ26, dry and recharge periods

Microbiology in fractures

Metagenomic : PZ26

Flow in borehole and piezometric head

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.



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.

Fracture mixing model

Matlab codes