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Geophysical indicators of controls on soil salinisation and implications, Longford Basin, Northern Tasmania

Citation

Direen, N and Roach, MJ, Geophysical indicators of controls on soil salinisation and implications, Longford Basin, Northern Tasmania, Exploration Geophysics, 28, (1-2) pp. 34-38. ISSN 0812-3985 (1997) [Refereed Article]

DOI: doi:10.1071/EG997034

Abstract

A SIROTEM survey and experimental petrophysical data from drillcores have enabled a study of apparent conductance anomalies in and around the Longford Basin of northern Tasmania. Within the basin depocentre, conductance anomalies due to the thickness irregularity of highly conductive layers reflect stacking and migration of fluvial systems. Outside the basin margins, conductance anomalies reflect changes in the conductivity of drainage bedload which is a function of watershed lithology. The anomalously conductive Tertiary sediments have three possible sources for stored salt: Inheritance from erosion of conductive Triassic red bed sequences in the basement below the Tertiary sequence; relict meteoric salt from proximity to a drowned estuary; or ions released from extensive lateritisation of lavas after a period of Eocene to Miocene basaltic volcanism. © 1997, CSIRO. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geophysics not elsewhere classified
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Environment not elsewhere classified
Author:Direen, N (Dr Nicholas Direen)
Author:Roach, MJ (Dr Michael Roach)
ID Code:12114
Year Published:1997
Deposited By:Earth Sciences
Deposited On:1997-08-01
Last Modified:2011-08-15
Downloads:0

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