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

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Direen, NG and Roach, MJ (1997) Geophysical indicators of controls on soil salinisation and implications, Longford Basin, northern Tasmania. Exploration Geophysics, 28. pp. 34-38. ISSN 0812-3985

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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.

Item Type: Article
Journal or Publication Title: Exploration Geophysics
Page Range: pp. 34-38
ISSN: 0812-3985
Identification Number - DOI: 10.1071/EG997034
Additional Information:

Copyright 1997 CSIRO

Date Deposited: 11 Jun 2012 23:27
Last Modified: 18 Nov 2014 04:38
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