Isotope compositions in a natural gas seep, French Alps
The Fontaine Ardente (FA) and Rochasson (ROC) natural gas seepage sites are located southwest (FA) and east (ROC) of Grenoble, France. For both field sites, gas is thought to originate from buried Middle Jurassic mudstones and argillaceous limestones and thought to migrate upward along small faults. At FA, the site located along a small seepage close to the river bed of a small creek. The gas seepage site at ROC is located along the flank of a thalweg and is linked to a small landslide in clayey horizons. New methane clumped isotope data is correlated to previously published data by Gal et al (2017) and recent isotopic data acquired within SECURe deliverable 3.4. During October 2019, 5 samples were collected from the FA and ROC sites and the following analyses were conducted: - Gas composition (C1-C5, CO2, N2, H2S, Ar) and and stable isotope analyses (methane δ13C and δD, CO2 δ13C, δ15N) - Methane clumped isotope analyses (Δ13CD and ΔDD) The dataset was created within SECURe project (Subsurface Evaluation of CCS and Unconventional Risks) - https://www.securegeoenergy.eu/. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 764531
dataset
:
http://data.bgs.ac.uk/id/dataHolding/13607742
English
Geoscientific information
GEMET - INSPIRE themes, version 1.0:
BGS Thesaurus of Geosciences:
Carbon dioxide
Isotopes
NGDC Deposited Data
UKCCS
Methane
Free:
Free:
NERC_DDC
5.6200,
44.9800,
5.7700,
45.2300
FR, FRA, FRANCE [id=210000]
creation: 2021-04-21
2019-10-13
-
2019-10-18
text table
TNO
Jurgen Foeken
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Utrecht
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British Geological Survey
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Data Quality
Gas sampling was performed by inserting a soil probe or burying an inverted funnel over an active gas vent. The gas was pumped slowly from the gas vent into 1L gas-tight glass vessels through a drying agent filled with Mg(ClO4)2. Three samples were collected in Isotubes. Both the vessel and the Isotubes were flushed with 3 volumes of gas before it was collected. Three samples were sampled directly at the main gas vents, whereas an additional two were sampled in the vicinity of the main gas vents from soil gas. Major gas composition of the FA and ROC samples was measured on a gas chromatograph at GFZ. Carbon isotopes (δ13C) of CH4 and CO2 were measured on a MAT 253 GC-IRMS at GFZ. Methane clumped isotope analyses are conducted on a Thermo Scientific IRMS-253 Ultra.
INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
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Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
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c0a47230-55f5-4e78-e054-002128a47908
British Geological Survey
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2024-04-24