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dc.contributor.authorMcNamara, David D.
dc.contributor.authorLister, Aaron
dc.contributor.authorPrior, Dave J.
dc.date.accessioned2017-08-14T14:08:15Z
dc.date.issued2016-05-10
dc.identifier.citationMcNamara, David D., Lister, Aaron, & Prior, Dave J. (2016). Calcite sealing in a fractured geothermal reservoir: Insights from combined EBSD and chemistry mapping. Journal of Volcanology and Geothermal Research, 323, 38-52. doi: http://dx.doi.org/10.1016/j.jvolgeores.2016.04.042en_IE
dc.identifier.issn0377-0273
dc.identifier.urihttp://hdl.handle.net/10379/6726
dc.description.abstractFractures play an important role as fluid flow pathways in geothermal resources hosted in indurated greywacke basement of the Taupo Volcanic Zone, New Zealand, including the Kawerau Geothermal Field. Over time, the permeability of such geothermal reservoirs can be degraded by fracture sealing as minerals deposit out of transported geothermal fluids. Calcite is one such fracture sealing mineral. This study, for the first time, utilises combined data from electron backscatter diffraction and chemical mapping to characterise calcite vein fill morphologies, and gain insight into the mechanisms of calcite fracture sealing in the Kawerau Geothermal Field. Two calcite sealing mechanisms are identified 1) asymmetrical syntaxial growth of calcite, inferred by the presence of single, twinned, calcite crystals spanning the entire fracture width, and 2) 3D, interlocking growth of bladed vein calcite into free space as determined from chemical and crystallographic orientation mapping. This study also identifies other potential uses of combined EBSD and chemical mapping to understand geothermal field evolution including, potentially informing on levels of fluid supersaturation froni the study of calcite lattice distortion, and providing information on a reservoir's history of stress, strain, and deformation through investigation of calcite crystal deformation and twinning patterns. (C) 2016 Elsevier B.V. All rights reserved.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherElsevieren_IE
dc.relation.ispartofJournal Of Volcanology And Geothermal Researchen
dc.subjectCalciteen_IE
dc.subjectFracture sealingen_IE
dc.subjectKawerau geothermal fielden_IE
dc.subjectReservoiren_IE
dc.subjectPermeabilityen_IE
dc.subjectTaupo volcanic zoneen_IE
dc.subjectLow temperature deformationen_IE
dc.subjectSoultz sous foretsen_IE
dc.subjectNew Zealanden_IE
dc.subjectCrack sealen_IE
dc.subjectActive riften_IE
dc.subjectFluid flowen_IE
dc.subjectE-twinsen_IE
dc.subjectGrowthen_IE
dc.subjectSystemen_IE
dc.titleCalcite sealing in a fractured geothermal reservoir: Insights from combined EBSD and chemistry mappingen_IE
dc.typeArticleen_IE
dc.date.updated2017-07-22T15:11:28Z
dc.identifier.doi10.1016/j.jvolgeores.2016.04.042
dc.local.publishedsourcehttps://doi.org/10.1016/j.jvolgeores.2016.04.042en_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funder|~|
dc.description.embargo2018-05-10
dc.internal.rssid11991913
dc.local.contactDavid Mcnamara, -. - Email: david.d.mcnamara@nuigalway.ie
dc.local.copyrightcheckedYes
dc.local.versionACCEPTED
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