This dataset comprises lineaments interpreted from 250m gridded gravity data. The data is presented as Bouguer gravity using an industry standard reduction (continental crust) density of 2.67 T/m3 for the density of bedrock . Analysis has focussed on interpreting structural trends not addressed closely by the work completed by the former Department of Primary Industries (DPI) - specifically NNE-SSW, ENE-WSW and WNW-ESE trends.
The dataset was compiled by GHD to inform the report 'Potential Influences of Geological Structures on Groundwater Flow Systems' for DEPI's Secure Allocation Future Entitlements (SAFE) Project.
Search Words:
Inland waters
,
Geoscientific information
Publication Date:
01 February 2018
Dataset Status:
Victoria
Progress:
Completed
Access Constraint:
Creative Commons Attribution 4.0 (CC-BY)
(
License Text
)
General
Data Existence:
Metadata Name
Descriptions
Resource Name:
LINEAMENTS_GRAVITY
Title:
Lineaments interpreted from Gravity Data
Anzlic ID:
ANZVI0803005006
Custodian:
Owner:
Jurisdiction:
Victoria
Abstract:
This dataset comprises lineaments interpreted from 250m gridded gravity data. The data is presented as Bouguer gravity using an industry standard reduction (continental crust) density of 2.67 T/m3 for the density of bedrock . Analysis has focussed on interpreting structural trends not addressed closely by the work completed by the former Department of Primary Industries (DPI) - specifically NNE-SSW, ENE-WSW and WNW-ESE trends.
The dataset was compiled by GHD to inform the report 'Potential Influences of Geological Structures on Groundwater Flow Systems' for DEPI's Secure Allocation Future Entitlements (SAFE) Project.
Search Words:
Inland waters
,
Geoscientific information
Purpose:
Geographic Extent Polygon:
Geographic Bounding Box:
-34
141
150
-39
Beginning to Ending Date:
2011-06-30 - 2012-06-30
Maintainence and Update Frequency:
As needed
Stored Data Format:
Available Format(s) Types:
DIGITAL
Positional Accuracy:
Not known
Attribute Accuracy:
Not known
Logical Consistency:
Not known
Data Source:
Dataset Source: The source gravity data was processed using ER Mapper and an industry standard reduction (continental crust) density of 2.67 T/m3 to derive a 250m gridded Bouguer gravity dataset. Follow-on lineament analysis was undertaken with an emphasis on the interpretation of structures cross-cutting the bedrock lithology grain. This is in contrast to the bedrock structural interpretation completed by the (former) Department of Primary Industries (DPI) which has largely identified key lineaments parallel to the bedrock lithology grain.
Linear structures evident to a greater or lesser extent from all of the east, north, north-east, north-west and overhead vertical sun angles were interpreted. For this study, because of the importance of NNW trending bedrock lithology grain and ENE (particularly) and WNW (to a lesser extent) trending cross-cutting structures, the sun-angles chosen for geophysical image display tend to be NNW to NNE and high in the sky (+70 degrees).
In relation to the gravity lineament interpretation:
The former DPI basement fault dataset and the current gravity lineaments represent the complete lineament interpretation of the gravity data;
The digitised gravity lineaments are more related to lithological boundaries (e.g. edge of granites, dykes, etc) than structural features such as faulting;
If there is sufficient bedrock control (e.g. bedrock and bores) then bedrock geology effects can be removed to give an enhanced bedrock profile;
There may be high density bedrock e.g. metamorphic or greenstone rocks (which are evident from topographic highs in outcrop) under basin cover in difference to less dense, more erodible bedrock (such as granite) which may be bedrock lows.
Dataset Originality: Derived
))