New insights to the lithostratigraphy of the Pedirka Basin, Northern Territory
Details:
Title
New insights to the lithostratigraphy of the Pedirka Basin, Northern Territory,
Creator
Doig, A.,
Jarrett, A. J. M,
Verdel, C,
Issued by
Northern Territory Geological Survey,
Collection
E-Publications,
E-Books,
PublicationNT,
NTGS Record 2023-013,
NTGS Record,
Date
2023-11-21,
Location
Simpson Desert,
Abstract
The Pedirka Basin is a Permian to Triassic intra-cratonic sedimentary basin located in the southeast corner of the Northern Territory and extending into South Australia and Queensland. It comprises a stacked succession up to 1.5 km thick of glacial, fluvioglacial, fluvial, lacustrine, coal swamp and continental redbed deposits.
This Record presents a revision of the stratigraphy and depositional environments in the Northern Territory portion of the Pedirka Basin. This revision is based on two main investigative components. Firstly, in-depth logging, comprising detailed observations of HyLoggerTM imagery, visual lithological logging of drill core, and interpretation of wireline logs (where available), which together have enabled updated facies interpretations and refinement of depositional settings of the formations. Secondly, new palynology results have more tightly constrained the ages of the stratigraphic intervals and provided additional information on depositional environments. In addition, recent collaborative work has provided new insights into the correlation of units across the Pedirka Basin and overlying Eromanga Basin boundary.
Outcomes include a sedimentological analysis of the Crown Point Formation that demonstrates interfingering and repetition of facies types, resulting in the use of the term 'Tirrawarra Sandstone equivalent' in the Northern Territory to be abandoned. The internal subdivision of the Purni Formation has been refined and updated; multiple lines of evidence indicate that deposition of the basal part of the Purni Formation occurred in a reducing lacustrine environment or possibly a restricted marine influence. In addition, the study has noted the presence of Late Permian sedimentation in the Pedirka Basin; due to this finding, and from evidence of other workers, the term 'Simpson Basin' should be disbanded and the entire Permo- Triassic stratigraphy be included in the Pedirka Basin
As a result, the lithology and stratigraphy of the Pedirka Basin in the Northern Territory have been updated. This will have direct relevance for the exploration of a range of subsurface resources including energy systems (petroleum, coal, carbon capture and storage, hydrogen, geothermal) and groundwater.
In line with this work, publicly available data was collated into a NTGS digital information package (Doig and Jarrett 2021), and these data have been used to refine the basin history and petroleum prospectivity of the region.,
Notes
Made available by via Publications (Legal Deposit) Act 2004 (NT),
With the exception of the Northern Territory of Australia logo, other government and corporate logos, and where otherwise noted, all material in this publication is provided under a Creative Commons Attribution 4.0 International licence. You are free to re-use the work under the licence, on the condition that you attribute the Northern Territory of Australia (Northern Territory Geological Survey) and Commonwealth of Australia (CSIRO), and comply with the other licence terms.,
Language
English,
Subject
Imagery,
Stratigraphy,
Lithology,
Walkandi Formation,
Hylogger,
Eromanga Basin,
McDills SG5307,
Peera Peera Formation,
Simpson Desert North SG5304,
Crown Point Formation,
Pedirka Basin,
Hale River SG5303,
Simpson Desert South SG5308,
Purni Formation,