https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/84322 2026-08-20T01:30:23Z 2026-08-20T01:30:23Z Grosjean, E Denman, J Wang, L Anderson, J Jorgensen, D https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/94739 2026-07-21T22:53:34Z 2026-01-01T00:00:00Z

Title: Petrography of the Birrindudu Basin and surrounds Author: Grosjean, E; Denman, J; Wang, L; Anderson, J; Jorgensen, D Abstract: As part of the Resourcing Australia's Prosperity initiative, an expanded drill core sampling program of legacy drillholes within the broader Birrindudu Deep Dive region was carried out in 2024 in the Northern Territory Geological Survey core repository in Darwin. Over 1,000 samples from 23 drillholes were collected for analytical work to support the assessment of resources in the region. As part of this sampling program, 72 samples from 19 legacy drillholes, and two legacy field samples were selected for thin section petrography. These samples are interpreted to belong to the Daly Basin, Kalkarindji Igneous Province, Birrindudu Basin, Pine Creek Orogen and Inverway Metamorphics as well as metamorphosed basement that is currently not assigned a formal name.; This record presents the results of the petrographic and semi-quantitative X-ray Diffraction analysis undertaken by Microanalysis Australia under contract to Geoscience Australia, on rock samples from selected drillholes and field samples across the Birrindudu Deep Dive area. These samples are expected to improve the geological knowledge of the region, by shedding light on the wider stratigraphic relationships and associated energy and mineral systems of the BDD region.

2026-01-01T00:00:00Z Giuliano, WC https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/94738 2026-07-21T22:48:28Z 2016-01-01T00:00:00Z

Title: Raw geochemical results from samples in the McArthur Basin Author: Giuliano, WC Abstract: The Proterozoic McArthur Basin, Northern Territory, Australia, hosts some of the oldest proven hydrocarbon sources in the world including the organic rich black shale unit in the McArthur Group, the Barney Creek Formation. Stratigraphically positioned between dolomitic carbonate units, the depositional setting for the Barney Creek Formation has been in debate for at least three decades. Published literature supports both an anoxic coastal lagoon/lacustrine environment and also a relatively deep-marine low-energy deposition. Here we employ high-resolution records of stable isotope ratios (d13C, d18O 87Sr/86Sr) and elemental concentrations (Ba/Ca) in the carbonates rich sedimentary record of the McArthur Group (cores LV09001, McA5, BJ2, BCF 4) as proxies to constrain paleo-depositional environments. Using samples from the LV09001 core, we were able to create a high-resolution, geochemical and isotope ratio profile of the Glyde Package, McArthur Group. Ranging from the Emmerugga Dolomite to the Donnegan Member. Acquired d13C, 87Sr/86Sr and Ba/Ca stratigraphic trends indicate a changing paleo-environment at the time of sediment deposition and carbonate precipitation. In particular a systematic negative d13C anomaly, magnitude around 2.5‰, is recorded in the Barney Creek Formation, where Ba/Ca ratios are also anomalously high and coeval 87Sr/86Sr trend indicates a 'non-marine' restricted environment. Observed light carbon (12C), and elevated barium concentrations (Ba/Ca ratios) are likely controlled by local cycling of organic matter in a redox-stratified restricted basin analogous to modern Black Sea. A restricted setting also aids in chemical and redox stratification, creating deep water anoxic and low energy conditions for the deposition of the Barney Creek Formation. Finally, our constraints from coupled C and Sr isotope data, collected from the most 'marine' carbonate intervals, suggest that the inferred d13C and 87Sr/86Sr signatures of Proterozoic paleo-seawater (at about 1640 Ma) were close to -0.5 to 0 per mil, and 0.705 to 0.706, respectively. -- from thesis abstract

2016-01-01T00:00:00Z Giogioni, M Brocks, JJ Jarrett, AJM Klaebe, RM https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/94733 2026-07-02T04:48:53Z 2013-01-01T00:00:00Z

Title: Isotope, elemental and biomarker data of samples collected in the Amadeus Basin Author: Giogioni, M; Brocks, JJ; Jarrett, AJM; Klaebe, RM

2013-01-01T00:00:00Z Riedman, LA https://geoscience.nt.gov.au/gemis/ntgsjspui/handle/1/94732 2026-07-02T17:10:50Z 2026-01-01T00:00:00Z

Title: Palaeontological and geochemical analyses on samples taken across the Northern Territory Author: Riedman, LA

2026-01-01T00:00:00Z