Identification

Title

Isotope compositions in a natural gas seep, French Alps

Abstract

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

Resource type

dataset

Resource locator

https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item164845

name: Data

function: download

https://doi.org/10.5285/d421bd1f-233f-4738-80ec-bb53fd91b0d7

name: Digital Object Identifier (DOI)

function: information

Unique resource identifier

code

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

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Carbon dioxide

Isotopes

Methane

originating controlled vocabulary

title

reference date

date type

revision

effective date

2011

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

5.6200

East bounding longitude

5.7700

North bounding latitude

45.2300

South bounding latitude

44.9800

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

FR

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

FRA

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

FRANCE [id=210000]

Temporal reference

Temporal extent

Begin position

2019-10-13

End position

2019-10-18

Dataset reference date

date type

creation

effective date

2021-04-21

Frequency of update

notApplicable

Quality and validity

Lineage

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.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

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

Data format

name of format

MS Excel

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

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.

Responsible organisations

Responsible party

organisation name

TNO

full postal address

Postbus 80015, 3508 TA

Utrecht

email address

not available

responsible party role

originator

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

distributor

Responsible party

organisation name

British Geological Survey

email address

not available

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Environmental Science Centre,Keyworth

NOTTINGHAM

NG12 5GG

United Kingdom

telephone number

+44 115 936 3100

email address

enquiries@bgs.ac.uk

responsible party role

pointOfContact

Metadata date

2023-05-24

Metadata language