Report
TR20_139_140
Date
01/01/1977
Author(s)
Cromer, W.C.
Title
Gravity survey of the Devonport-Port Sorell-Sassafras area
Tenement(s)
Physical Description
1 volumes, 2 pp, 2 figures
Digital Media
Other Ref.
Map (250K)
SK55-3 BURNIE
Map (50/100K)
81151 Devonport
,
81152 Sheffield
,
82153 Rubicon
,
82154 Port Sorell
Geographic
Devonport
,
Port Sorell
,
Sassafras
Activities
Geology
,
Geophysics
,
Gravity
,
Structure
Minerals
Deposits
Keywords
Basalt
,
Deep Leads
,
Devonport-Port Sorell Sub-Basin
Annotation
Previous regional gravity surveys in northern Tasmania delineated large negative anomalies associated with Tertiary structural troughs. Leaman (1973) extended the coverage to the Devonport-Port Sorell area and showed that anomalies of 13 and 6 mgal were related to the Wesley Vale and Port Sorell basins respectively. Both contain a thick Tertiary succession of sediments and basalts. The gravity data also suggested that a third trough existed north of Sassafras, and that it may represent a southward continuation of the Wesley Vale basin.