https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/81432 Wed, 24 Feb 2021 00:21:21 GMT 2021-02-24T00:21:21Z https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90688 Title: Summary of results. NTGS laser ablation ICP-MS in situ monazite petrochronology project: Constraining the chronologic history of the Delny and Entire Point shear zones, and the timing of metamorphism in the Aileron and Irindina provinces Author: Reno, BL; Weisheit, A; Beyer, EE; Thompson, JM; Meffre, S Abstract: This record presents trace-element and chronologic data collected on monazite at the Australian Research Council Centre of Excellence in Ore Deposits (CODES) at the University of Tasmania. Analyses were carried out in March and April of 2016 and May of 2017 in support of Northern Territory Geological Survey (NTGS) regional geoscientific investigations and mapping programs. Isotope data and interpretations for monazite from 18 samples taken from the Aileron and Irindina provinces in HUCKITTA in the Northern Territory are presented herein. Monazite was analysed in order to constrain the timing, duration, and rate of metamorphism in this region, and to constrain the timing of movement and deformation on the Delny and Entire Point shear zones and Jervois Fault Zone.; A total of 18 samples were analysed from two collections: one set of monazite chronologic data was obtained from a total of 14 samples from the Palaeoproterozoic Aileron Province, and another set was obtained from 4 samples of the Yambla Gneiss in the Neoproterozoic-Palaeozoic Irindina Province. Wed, 01 Jan 2020 00:00:00 GMT https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90688 2020-01-01T00:00:00Z https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90626 Title: Revised stratigraphy of drillhole BL002, northeastern Amadeus Basin, Northern Territory Author: Normington, VJ Abstract: A revised stratigraphy is presented for drillhole BL002, located on the northeastern margin of the Amadeus Basin in the Northern Territory. The revisions include newly defined boundaries and updates of the Neoproterozoic stratigraphic nomenclature to align with the recently amended stratigraphy of the Amadeus Basin. In descending order, drillhole BL002 now includes a fault zone, a palaeoweathering zone, and the Gillen Formation of the Bitter Springs Group. Wed, 01 Jan 2020 00:00:00 GMT https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90626 2020-01-01T00:00:00Z https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90622 Title: Characterisation of the Neoproterozoic succession of the northeastern Amadeus Basin, Northern Territory Author: Normington, VJ; Donnellan, N Abstract: The Neoproterozoic to Palaeozoic Amadeus Basin is a large (~170 000 km2), elongate intracratonic basin in central Australia, located predominantly in the Northern Territory but extending into Western Australia. It preserves a depositional history spanning the Neoproterozoic to Devonian, which is punctuated by a number of epeirogenic, orogenic and erosional episodes that have resulted in unconformities and time breaks of local and/or regional extent. In addition, there is a recognised, but poorly documented, contribution of halotectonic activity during both depositional and tectonic periods of basin history. The focus of this study is the Neoproterozoic succession of the Amadeus Basin; this is best exposed along the structurally controlled northeast margin of the basin, which therefore was the location of the field investigations.; This Record addresses the lack of type sections and formal definitions for some units, and provides the first formal definitions for other units. The work has resulted in important revisions to the stratigraphy of the Neoproterozoic succession of the Amadeus Basin, including the promotion of the Bitter Springs Formation and its constituent Gillen, Loves Creek and Johnnys Creek members to group and formation status respectively, as well as the formalisation of the 'Finke beds' as the Wallara Formation. For each of the units in the Neoproterozoic succession, the following topics are addressed:; - diagnostic outcrop characteristics; - derivation of name and synonymy; - distribution of type and reference sections; - lithology and thickness; - bedding characteristics, sedimentary structures and fossils; - age, contacts and correlative units.; In addition, this Record includes numerous field images with detailed captions documenting the main characteristics of the units. Wed, 01 Jan 2020 00:00:00 GMT https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90622 2020-01-01T00:00:00Z https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90621 Title: Summary of results. Joint NTGS-GA geochronology project: western Amadeus Basin, July 2019-June 2020 Author: Beyer, EE; Verdel, C; Normington, VJ; Magee, C Abstract: This Record presents data collected between December 2019 and February 2020 as part of the ongoing Northern Territory Geological Survey-Geoscience Australia SHRIMP geochronology project under the National Collaboration Framework agreement and Geoscience Australia's Exploring for the Future Program. New U-Pb SHRIMP zircon geochronological and trace element results derived from 11 sedimentary samples from the western Amadeus Basin in the Northern Territory are presented herein. Results for each sample, comprising sample location and geological context, a description of the target mineral for geochronology, the relevant analytical data, and a brief geochronological interpretation are documented. Wed, 01 Jan 2020 00:00:00 GMT https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/90621 2020-01-01T00:00:00Z