Stable isotopes of lithium as Indicators of coal seam gas-bearing aquifers

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dc.contributor.authorOwen, DDRen_AU
dc.contributor.authorMillot, Ren_AU
dc.contributor.authorNégrel, Pen_AU
dc.contributor.authorMeredith, KTen_AU
dc.contributor.authorCox, MEen_AU
dc.date.accessioned2015-09-09T22:10:35Zen_AU
dc.date.available2015-09-09T22:10:35Zen_AU
dc.date.issued2015-08-21en_AU
dc.date.statistics2015-09-07en_AU
dc.description.abstractIn this study lithium isotopes were used in combination with hydrochemistry to investigate interactions between coal-seam-gas bearing sedimentary bedrock aquifers and surrounding basalt and alluvial aquifers in a large catchment in eastern Australia. Understanding groundwater transport and aquifer connectivity is critical to managing coal seam gas (or coal bed methane) developments, because large volumes of water need to be extracted in order to release the sorbed gas; however, to date lithium isotopes have not been applied to coal seam gas groundwater management problems and no information on the δ7Li of coal or coal-seam groundwater is available. Li/Cl and Li/Na ratios in the coal-bearing and sedimentary bedrock aquifers are distinct (>0.0001) from alluvial and basalt aquifers (<0.0001). Preliminary δ7Li results for coal measure samples are typically between 7 and 11‰; many of these samples also contain methane, and can therefore be expected to be influenced by coal and the early stages methanogenesis. Interestingly the coal measure with lowest δ7Li value occurs in an area where the coal measures outcrop and direct recharge is likely, with nearby basalt groundwater having much higher δ7Li values (δ7Li>18‰). Preliminary lithium isotope results show that δ7Li may be effective in distinguishing groundwater flow paths in the coal-bearing aquifer from basalt aquifers, and from a transitional zone between the alluvium and underlying coal measures. Further lithium isotope analysis is being carried out to: a) compare the δ7Li between alluvial, basalt and coal-bearing aquifers to further investigate aquifer connectivity; b) to describe δ7Li for CSG production waters with low- and high-methane groundwater in the coal-bearing aquifer; c) to describe the δ7Li from coal and basalt leachate. © 2015, Elsevier B.V.en_AU
dc.identifier.citationOwen, D. D. R., Millot, R., Négrel, P., Meredith, K., & Cox, M. E. (2015). Stable isotopes of lithium as indicators of coal seam gas-bearing aquifers. Procedia Earth and Planetary Science, 13, 278-281. doi:10.1016/j.proeps.2015.07.065en_AU
dc.identifier.govdoc6041en_AU
dc.identifier.issn1878-5220en_AU
dc.identifier.journaltitleProcedia Earth and Planetary Scienceen_AU
dc.identifier.pagination278-281en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.proeps.2015.07.065en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6187en_AU
dc.identifier.volume13en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectStable isotopesen_AU
dc.subjectLithiumen_AU
dc.subjectIndicatorsen_AU
dc.subjectCoalen_AU
dc.subjectAquifersen_AU
dc.subjectSedimentary rocksen_AU
dc.titleStable isotopes of lithium as Indicators of coal seam gas-bearing aquifersen_AU
dc.typeJournal Articleen_AU
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