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Measuring the Stable Isotope Composition of Water in Brine from Halite Fluid Inclusions and Borehole Brine Seeps Using Cavity Ring-Down Spectroscopy

Journal Article · · ACS Earth and Space Chemistry
Naturally occurring bedded salt deposits are considered robust for the permanent disposal of heat-generating nuclear waste due to their unique physical and geological properties. The Brine Availability Test in Salt (BATS) is a US-DOE Office of Nuclear Energy funded project that uses heated borehole experiments underground (~655 meters depth) at the Waste Isolation Pilot Plant (WIPP) in the bedded salt deposits of the Salado Formation to investigate the capacity for safe disposal of high-level, heat generating nuclear waste in salt. Uncertainties associated with brine mobility near heat-generating waste motivates the need to characterize the processes and sources of brine in salt deposits. Intragranular halite fluid inclusions are a potential source of brine that can migrate under temperature gradients toward heat sources. We developed a methodology to measure the stable isotopic compositions of water (δDVSMOW, δ18OVSMOW) in brine from halite fluid inclusions using Cavity Ring-Down Spectroscopy that accounts for memory effects using a unique reference-sample-reference bracketing approach and that minimizes sample size requirements. We applied this approach to halite samples obtained from WIPP and compare these data to seeped brines collected from horizontal boreholes at WIPP after drilling at ambient conditions. Here, the stable isotope compositions that we obtain for halite fluid inclusions (δ18OVSMOW = +3.24 ± 0.53‰, δDVSMOW = -25.3 ± 5.1‰, ±1σ, n = 5) generally agree with previous measurements and likely reflect a combination of syn-depositional and/or postdepositional processes. The seep brines are isotopically distinct (δ18OVSMOW = +3.46 ± 0.84‰, δDVSMOW = +7.3 ± 3.5‰, ±1σ, n = 35) and instead resemble evaporated seawater. We discuss our results in the context of prior WIPP-proximal waters and lay the groundwork for using stable isotopes of water in brine as a tool to assess the heat-induced mobilization of halite fluid inclusions in ongoing heating experiments that comprise the Brine Availability Test in Salt.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE), Office of Spent Fuel and Waste Disposition. Office of Spent Fuel and Waste Science and Technology; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525; 89233218CNA000001
OSTI ID:
2496663
Alternate ID(s):
OSTI ID: 2482103
Report Number(s):
LA-UR--24-23008
Journal Information:
ACS Earth and Space Chemistry, Journal Name: ACS Earth and Space Chemistry Journal Issue: 1 Vol. 9; ISSN 2472-3452
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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