Accumulative evidence highlighting that the Narrabri and Gunnedah formations are mythical

Simple item page
dc.contributor.authorKelly, BFJen_AU
dc.contributor.authorCendón, DIen_AU
dc.contributor.authorIverach, CPen_AU
dc.contributor.authorHarris, SJen_AU
dc.contributor.authorHankin, SIen_AU
dc.date.accessioned2021-12-24T00:57:08Zen_AU
dc.date.available2021-12-24T00:57:08Zen_AU
dc.date.issued2017-07-12en_AU
dc.date.statistics2021-11-03en_AU
dc.description.abstractThe Narrabri and Gunnedah Formations, used to describe the valley-filling sedimentary sequences in portions of the Murray-Darling Basin, have never been formally defined. The hydrogeological evidence for naming these formations is reviewed in the context of modern sedimentary models. Are we using the right architectural model? Hundreds of lithological logs from the Murrumbidgee, Namoi, and Gwydir catchments are used to examine the evolution of each alluvial aquifer. For each depth interval, the catchment-wide proportions of coarse (gravel, sand) and fine (silt, clay) sediments is determined. Sediment size distributions are then examined in the context of past climates and the conceptual inland fluvial model for distributive fluvial systems. Vertical hydraulic connectivity is examined using new hydrogeochemical data and nested groundwater hydrograph sets. All systems show the core features of aggradational distributive fluvial systems. The valley-filling sequences for all catchments examined transitioned from high energy wet environments at depth, dominated by sand and gravel deposits, through to the modern-day low-energy silt and clay dominated depositional environments. Gravel and sand deposits dominate in the proximal portion of the catchment, and low energy silt and clay deposits dominate in the distal portions. The apparent existence of the Narrabri and Gunnedah Formations is due to changing sediment grain size proportion and channel fill sand connectivity. Both the facies and hydrograph analyses show that semi-confining layers are only local. Extensive hydrogeochemical data from the Namoi catchment show continuity of mixing between basement and surface inflows. All catchments have many sedimentary architectural features consistent with the distributive fluvial system model, and reflect changing climate throughout the Neogene and Quaternary. Use of the Narrabri and Gunnedah Formation nomenclature, which has been incorporated into the National Aquifer Framework, is not supported by either the sedimentological, hydrograph or hydrogeochemical record.en_AU
dc.identifier.citationKelly, B.F., Cendón, D.I., Iverach, C.P., Harris, S. J. & Hankin, S. (2017). Accumulative evidence highlighting that the Narrabri and Gunnedah formations are mythical. Paper presented to the 2017 Biennial Australasian Groundwater Conference, UNSW Sydney, 11 - 13 July 2017. Retrieved from: http://agc-2017.p.agc2017.currinda.com/days/2017-07-12/abstract/249en_AU
dc.identifier.conferenceenddate13 July 2017en_AU
dc.identifier.conferencename2017 Biennial Australasian Groundwater Conferenceen_AU
dc.identifier.conferenceplaceSydney, Australiaen_AU
dc.identifier.conferencestartdate11 July 2017en_AU
dc.identifier.urihttp://agc-2017.p.agc2017.currinda.com/days/2017-07-12/abstract/249en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/12665en_AU
dc.language.isoenen_AU
dc.publisherNational Centre for Groundwater Research And Trainingen_AU
dc.subjectNew South Walesen_AU
dc.subjectAustraliaen_AU
dc.subjectSedimentary basinsen_AU
dc.subjectValleysen_AU
dc.subjectQuaternary perioden_AU
dc.subjectSanden_AU
dc.subjectClaysen_AU
dc.subjectSilten_AU
dc.subjectWatershedsen_AU
dc.titleAccumulative evidence highlighting that the Narrabri and Gunnedah formations are mythicalen_AU
dc.typeConference Paperen_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
GW008_FA Updated.pdf
Size:
4.1 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications