L178 Central Victoria (Stawell / Bendigo / Melbourne Zones) Seismic Transect, VIC, 2006 Stacked and Migrated Seismic data and images for line 06GA-V1, 06GA-V2, 06GA-V3, and 06GA-V4  

Authors / CoAuthors

Costelloe, R.D. | Nakamura, A. | Barton, T. | Tassell, H.

Abstract

A ~400 km long deep crustal reflection seismic survey was acquired in central Victoria, Australia, in 2006. It has provided information on crustal architecture across the western Lachlan Orogen and has greatly added to the understanding of the tectonic evolution. The east-dipping Moyston Fault is confirmed as the suture between the Delamerian and western Lachlan Orogens, and is shown to extend down to the Moho. The Avoca Fault, the boundary between the Stawell and Bendigo Zones, is a west-dipping listric reverse fault that intersects the Moyston Fault at a depth of about 22 km, forming a V-shaped geometry. Both the Stawell and Bendigo Zones can be divided broadly into a lower crustal region of interlayered and imbricated metavolcanic and metasedimentary rocks and an upper crustal region of tightly folded metasedimentary rocks. The Stawell Zone was probably part of a Cambrian accretionary system along the eastern Gondwanaland margin, and mafic rocks may have been partly consumed by Cambrian subduction. Much of the Early Cambrian oceanic crust beneath the Bendigo Zone was not subducted, and is preserved as a crustal-scale imbricate thrust stack. The seismic data have shown that a thin-skinned structural model appears to be valid for much of the Melbourne Zone, whereas the Stawell and Bendigo Zones have a thick-skinned structural style. Internal faults in the Stawell and Bendigo Zones are mostly west-dipping listric faults, which extend from the surface to near the base of the crust. The Heathcote Fault Zone, the boundary between the Bendigo and Melbourne Zones, extends to at least 20 km, and possibly to the Moho. A striking feature in the seismic data is the markedly different seismic character of the mid to lower crust of the Melbourne Zone. The deep seismic reflection data for the Melbourne Zone have revealed a multilayered crustal structure that supports the Selwyn Block model. Raw data for this survey are available on request from clientservices@ga.gov.au

Product Type

dataset

eCat Id

74819

Contact for the resource

Keywords

Australian and New Zealand Standard Research Classification (ANZSRC)

• Seismology and Seismic Exploration

( {1} )

• HVC_144637

( {1} )

• Seismic Data seismic survey

( Theme )

• geophysics

( Theme )

• mineral exploration

( Theme )

• seismic reflection

( Theme )

• seismic sections

( Theme )

• mining

( {1} )

• AU-VIC

( {1} )

• Published_External

Publication Date

2006-01-01T00:00:00

Creation Date

Security Constraints

Australian Government Security ClassificationSystem    

Classification - unclassified

Legal Constraints

Creative Commons Attribution 4.0 International Licence    

Access - license

Use - license

Status

Purpose

Maintenance Information

asNeeded

Topic Category

geoscientificInformation

Series Information

Lineage

Terrex Seismic was contracted by ANSIR to conduct seismic recording operations for approximately 400 km of 2D data within the central region of Victoria. Recording commenced on the 12th May 2006 and was completed twenty-four (24) days later on the 5th June 2006.

Parent Information

Extents

[-37, -35.5, 142.5, 146]

Reference System

Spatial Resolution

Service Information

Associations

Downloads and Links

Processed Seismic Package  

Source Information

Source data not available.