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 764 531

Date (Creation): 2021-04-21

Citation identifier: http://data.bgs.ac.uk/id/dataHolding/13607742

Point of contact

Organisation name	Individual name	Electronic mail address	Role
TNO	Jurgen Foeken	not available	Originator
British Geological Survey	Enquiries	not available	Distributor
British Geological Survey	Enquiries	not available	Point of contact

Maintenance and update frequency: notApplicable

GEMET - INSPIRE themes, version 1.0

Geology

BGS Thesaurus of Geosciences

Carbon dioxide
Isotopes
NGDC Deposited Data
UKCCS
Methane

dataCentre

Keywords

NERC_DDC

Access constraints: Other restrictions

Other constraints: licenceOGL

Other constraints: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Use constraints: Other restrictions

Other constraints: The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.

Other constraints: Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"

Spatial representation type: Text, table

Language: English

Topic category

Geoscientific information

Geographic identifier: FR
ISO 3166_1 alpha-2 2009 revision

Geographic identifier: FRA
ISO 3166_1 alpha-3 2009 revision

Geographic identifier: FRANCE [id=210000]
British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation

Begin date: 2019-10-13

End date: 2019-10-18

Unique resource identifier: WGS 84 (EPSG::4326)

Distribution format

Name	Version
MS Excel

Distributor contact

Organisation name	Individual name	Electronic mail address	Role
British Geological Survey	Enquiries	not available	Distributor

OnLine resource

Protocol	Linkage	Name
	https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item164845	Data

OnLine resource

Protocol	Linkage	Name
	https://doi.org/10.5285/d421bd1f-233f-4738-80ec-bb53fd91b0d7	Digital Object Identifier (DOI)

Hierarchy level: Dataset

Other: dataset

Conformance result

Title: INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology

Date (Publication): 2011

Explanation: See the referenced specification

Pass: No

Conformance result

Title: 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

Date (Publication): 2010-12-08

Explanation: See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Pass: No

Statement: 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.