Noble Gas Release from Bedded Rock Salt during Deformation

Journal Article · 19 June 2019 · Geofluids

DOI: https://doi.org/10.1155/2019/2871840 · OSTI ID:1528637

Bauer, Stephen J.  ^[1]; Gardner, W. Payton ^[2]; Lee, Hyunwoo ^[3]

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1. Geothermal Research Department, MS 1033, Sandia National Laboratories, Albuquerque, NM 87185, USA
2. Department of Geosciences, University of Montana, Missoula, MT, USA
3. School of Earth and Environmental Sciences, Seoul National University, Seoul 08826, Republic of Korea

Geogenic noble gases are contained in crustal rocks at inter- and intracrystalline sites. In this study, bedded rock salt from southern New Mexico was deformed in a variety of triaxial compression states while measuring the release of naturally contained helium and argon utilizing mass spectrometry. Noble gas release is empirically correlated to volumetric strain and acoustic emissions. At low confining pressures, rock salt deforms primarily by microfracturing, rupturing crystal grains, and releasing helium and argon with a large amount of acoustic emissions, both measured real-time. At higher confining pressure, microfracturing is reduced and the rock salt is presumed to deform more by intracrystalline flow, releasing less amounts of noble gases with fewer acoustic emissions. Our work implies that geogenic gas release during deformation may provide an additional signal which contains information on the type and amount of deformation occurring in a variety of earth systems.

• Sponsoring Organization: USDOE
• Grant/Contract Number: NA0003525
• OSTI ID: 1528637
• Alternate ID(s): OSTI ID: 1529138
• Journal Information: Geofluids, Journal Name: Geofluids Vol. 2019; ISSN 1468-8115
• Publisher: Hindawi Publishing CorporationCopyright Statement
• Country of Publication: Canada
• Language: English