10.5880/GFZ.4.6.2020.001 eng dataset GFZ German Research Centre for Geosciences datapub@gfz-potsdam.de http://www.gfz-potsdam.de Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences pointOfContact 2021-08-27 urn:ogc:def:crs:EPSG:4326 CO2 efflux, soil temperature and carbon/helium isotope results from the Los Humeros geothermal field, Mexico 2021-08-27 revision doi:10.5880/GFZ.4.6.2020.001 Jentsch, Anna GFZ German Research Centre for Geosciences, Potsdam, Germany author Jolie, Egbert GFZ German Research Centre for Geosciences, Potsdam, Germany author Jones, David G. BGS British Geological Survey, Keyworth, Nottingham, United Kingdom author Taylor-Curran, Helen BGS British Geological Survey, Keyworth, Nottingham, United Kingdom author Zimmer, Martin GFZ German Research Centre for Geosciences, Potsdam, Germany author Peiffer, Loic CICESE Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada, Baja California, Mexico author Lister, Bob BGS British Geological Survey, Keyworth, Nottingham, United Kingdom author GFZ Data Services publisher Magmatic volatiles can be considered as the surface fingerprint of active volcanic systems, both during periods of quiescent and eruptive volcanic activity. The spatial variability of gas emissions at Earth’s surface is a proxy for structural discontinuities in the subsurface of volcanic systems. We conducted extensive and regular spaced soil gas surveys within the Los Humeros geothermal field to improve the understanding of the structural control on fluid flow. Surveys at different scales were performed with the aim to identify areas of increased gas emissions on reservoir scale, their relation to unknown/knows volcano-tectonic structures on fault scale favoring fluid flow, and determine the origin of gas emissions. Herein, we show results from a carbon dioxide efflux scouting survey, which was performed across the main geothermal production zone together with soil temperature measurements. We identified five areas with increased carbon dioxide emissions, where further sampling was performed with denser sampling grids to understand the fault zone architecture and local variations in gas emissions. We show that a systematic sampling approach on reservoir scale is necessary for the identification and assessment of major permeable fault segments. The combined processing of CO2 efflux and carbon/helium isotopes facilitated the detection of permeable structural segments with a connection to the deep, high-temperature geothermal reservoir, also in areas with low to intermediate carbon dioxide emissions. The results of this study complement existing geophysical datasets and define further promising areas for future exploration activities in the north- and southwestern sector of the production field. The data are presented as one zip folder with 4 data tables (tab delimited text format) according to the measurement variable. The columns are defined in each data file. Complete Jentsch, Anna GFZ German Research Centre for Geosciences, Potsdam, Germany PhD ajentsch@gfz-potsdam.de pointOfContact multi-scale soil gas survey CO2 efflux carbon and helium isotopes geothermal exploration structural analysis EARTH SCIENCE > SOLID EARTH > GEOTHERMAL DYNAMICS > GEOTHERMAL TEMPERATURE EARTH SCIENCE > SOLID EARTH > TECTONICS > VOLCANIC ACTIVITY > ERUPTION DYNAMICS > VOLCANIC GASES NASA/GCMD Earth Science Keywords publication CC BY 4.0 CC BY 4.0 10.1016/j.jvolgeores.2020.106820 DOI IsSupplementTo Link to BGS Report when available URL References 10.1016/j.epsl.2008.07.051 DOI References 10.1016/S0883-2927(97)00076-0 DOI References 10.1017/S0016756899531774 DOI References 10.1016/0375-6742(74)90030-2 DOI References eng geoscientificInformation Large-scale CO2 efflux survey -97.4649 -97.4244 19.6615 19.6989 Area A -97.4634 -97.4603 19.6911 19.6947 Area B -97.4515 -97.4505 19.6956 19.6966 Area D -97.4551 -97.4541 19.6733 19.6754 Area E -97.4608 -97.4574 19.6699 19.6751 http://doi.org/10.5880/GFZ.4.6.2020.001 WWW:LINK-1.0-http--link Data Access - DOI Data Access - DOI information