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Pre-Tertiary basement structure of the central Murray Basin, and its effect on groundwater flow patterns
Abstract
The Murray Basin has an area of 320 000 km2 and is one of the most important sedimentary basins in Australia in terms of agricultural and cultural development. It is essentially a closed groundwater basin which consists of a thin cover (200-600 m) of sediments containing 4600 million megalitres of water varying in salinity from 500 mg/L to over 35 000 mg/L total dissolved salts.This study of the central Murray Basin covers an area of 200 x 300 km, and is based on 1700 km of seismic refraction, over 300 vertical electrical soundings and the analysis of several thousand bore logs.The pre-Tertiary basement surface was found to have highly variable relief of up to 300 m. A rectilinear system of crustal fractures has been responsible for the formation of a basement ridge complex, identified as the Ivanhoe Block. A three dimensional (3D) representation of the basement has been developed to highlight dominant trends. Occlusion of aquifers across the Ivanhoe Block is a controlling factor affecting the regional groundwater flow, and is a contributing cause of the outflow of saline groundwater to the land surface and the river system.
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Many areas within the WLRWHA are very dependent on seasonal rainfall and the ground water, which flows predominately in lines westward within the Ivanhoe block and deeply affected by the pulses coming from the snow melts in the Lachlan.
“Therefore, many areas within the WLRWHA are very dependent on seasonal rainfall and the ground water, which flows predominately in lines westward within the Ivanhoe block and deeply affected by the pulses coming from the snow melts in the Lachlan (Kemp 2010; Odins et al. 1991).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
Higher salinity occurs in areas where fresh ground water is unable to reach, including areas to the west of the Willandra Trough and to the south.
“This also results in higher salinity in areas where the fresh ground water is unable to reach (areas to the west of the Willandra Trough and to the south).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
The geometry of NNE troughs (Willandra trough, Iona Ridge, Balranald Trough) constrains the flow of ground water into a parallel flow alongside the Willandra trough and restricts the flow westward.
“For the ground water, this means that the conclusions from their studies show that the geometry of NNE troughs (Willandra trough, Iona Ridge, Balranald Trough) constrain the flow of ground water into a parallel flow alongside the Willandra trough and restrict the flow westward (See Figure 6) (Odins et al. 1991).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
Many areas within the WLRWHA are very dependent on seasonal rainfall and the ground water, which flows predominately in lines westward within the Ivanhoe block and is deeply affected by the pulses coming from the snow melts in the Lachlan.
“Therefore, many areas within the WLRWHA are very dependent on seasonal rainfall and the ground water, which flows predominately in lines westward within the Ivanhoe block and deeply affected by the pulses coming from the snow melts in the Lachlan (Kemp 2010; Odins et al. 1991).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
Seismic explorations by Odins et al. define the hydrogeography of the study area as primarily defined by the pre-Tertiary geological basement.
“Seismic explorations detailed by Odins et al. (1991) define the hydrogeography of the study area as to be primarily defined by the pre-Tertiary geological basement.”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. (1991)
Higher salinity occurs in areas where the fresh ground water is unable to reach (areas to the west of the Willandra Trough and to the south).
“This also results in higher salinity in areas where the fresh ground water is unable to reach (areas to the west of the Willandra Trough and to the south).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
The geometry of NNE troughs (Willandra trough, Iona Ridge, Balranald Trough) constrain the flow of ground water into a parallel flow alongside the Willandra trough and restrict the flow westward.
“For the ground water, this means that the conclusions from their studies show that the geometry of NNE troughs (Willandra trough, Iona Ridge, Balranald Trough) constrain the flow of ground water into a parallel flow alongside the Willandra trough and restrict the flow westward (See Figure 6) (Odins et al. 1991).”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
Seismic explorations detailed by Odins et al. (1991) define the hydrogeography of the study area as primarily defined by the pre-Tertiary geological basement.
“Seismic explorations detailed by Odins et al. (1991) define the hydrogeography of the study area as to be primarily defined by the pre-Tertiary geological basement.”
From Exploratory GIS: modelling past land use and occupancy with functional connectivity, willandra lakes region world heritage area, NSW, australia (2022) · cites this paper as Odins et al. 1991
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Research works printed but not linked: 1
- Odins, J. A. (1975). ‘The application of seismic refraction to groundwater studies of unconsolidated sediments’. Unpub. M.Sc. Thesis, University NSW, Kensington, Australia.
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Thomas, K. (2022) · Journal of Computer Applications in Archaeology · doi:10.5334/jcaa.98 · Cited by 1
Metadata
- Authors
- Odins, J. A., Williams, R. M., O’Neill, D. J., & Lawson, S. J.
- Affiliations
- Department of Water Resources, P.O. Box 3720 Parramatta, , N.S.W, . 2150
- Venue
- Exploration Geophysics
- Published
- 1991-06-01
- Volume
- 22
- Issue
- 2
- Pages
- 285-290
- ISSN
- 0812-3985
- 1834-7533
- Cited by
- 3
- References
- 0
- Language
- en
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