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  DEPARTMENT OF PRIMARY INDUSTRIES DPI


Geology of the Corryong

1:100 000 Map Area

Project team
Carol Simpson, Marc Hendrickx, Linda Bibby, Rebecca Allen, Diana Page, Chris Woodful, Chris Ferguson and Clare Carney

Project scope
The Geological Survey of Victoria mapped the Corryong area between 1996 and 1999, with the products released in November 2001 at the 14th VIMP launch. Geological mapping and interpretation of geophysical data over the Corryong 1:100 000 map area and the Victorian parts of the Rosewood and Kosciusko 1:100 000 map areas (CORRYONG) were the main focus of the project.

Description
CORRYONG is in the extreme northeast of the state within the Eastern Highlands, a mountainous tract of country covering a large portion of eastern Victoria. Several wide, flat river valleys cut into the highlands in the map area and drain into the Murray River system.
CORRYONG is in the eastern part of the Lachlan Fold Belt. It is within the Omeo Structural Zone, and includes parts of the High Plains and Corryong subzones, and the Wagga-Omeo Metamorphic Belt.

Its geological history involved deposition of a large volume of turbidites in a deep water setting (Pinnak Sandstone and Bendoc Group) that were then deformed and intruded by large granites during the Benambran and Bindian orogenies. Both regional and contact metamorphism accompanied intrusion of the granitic rocks. Early Devonian crustal extension resulted in emplacement of the bimodal Tintaldra Dyke Swarm, eruption of the Mount Burrowa Volcanic Group and intrusion of a suite of strongly fractionated leucocratic granites. These rocks are regarded as a co-genetic suite. The Dartella Caldera also formed at this time. The area was deformed again after the eruption of the calderas, possibly during the Tabberabberan Orogeny.

The dearth of preserved rocks of Late Devonian to Late Cretaceous age remains a major problem for the tectonic reconstruction of this time period. A landscape of low relief and probably low elevation had formed over most of southeastern Australia by the end of the Late Mesozoic.
At about 100 Ma, substantial uplift in the northern part of Victoria, including the Corryong region, occurred as a result of the breakup of the Gondwana supercontinent. Stream incision and erosion initiated during the uplift continues to the present day. Alluvial and colluvial deposits of late Cainozoic age fill the valleys of the Murray River and its tributaries.

The structural history involves deformation, metamorphism and intrusion in the Early Silurian Benambran Orogeny, followed by southward transport of the Omeo Zone during the Bindian Orogeny. A group of Early Devonian intrusions cuts across the predominant north to northwest trend of the folds and granite foliation and therefore post-dates this deformation. Post-Early Devonian deformation produced a series of mostly north- to northeast-trending brittle faults and alteration zones, and probably reactivated existing NNW-trending faults. Much later movement, followed by erosion, led to large relief changes across some of the northeast trending faults, such as the Walwa Fault.
Commodities exploited in the past include gold, tin, tungsten, base metals, fluorite, barite, dimension stone and construction materials.
There is potential for gold deposits hosted by Ordovician sedimentary rocks, base metal mineralisation in the Silurian granites and Devonian dyke swarms, tin deposits associated with the Silurian S-type granites, and fluorite deposits. There is also potential for economic feldspar deposits and dimension stone in the Devonian granites.

View north from Mount Boebuck. The plateau in the distance is formed by the
Jemba Ignimbrite. The hills in the middle distance are Pinnak Sandstone.

Large tors of Harringtons Tonalite exposed along the Indi River.

Folds in Pinnak Sandstone along the Indi River.

Pine Mountain fluorite mine workings, 1950's.

Products
The results of the Corryong mapping project are published as four 1:50 000 scale geological maps and a 1:100 000 geological interpretation of geophysical features. The accompanying report contains information on previous work, physiography, regional geology and geological history, geophysics, stratigraphy, intrusive history, metamorphic and structural geology, economic geology and an assessment of the prospectivity of the area.
* Report containing explanatory notes, detailing the geology, geophysical characteristics and prospectivity of the area.
* Corryong and parts of Mannus and Khancoban 1:50 000 geological map
* Nariel and part of Geehi 1:50 000 geological map
* Cravensville 1:50 000 geological map
* Shelley and part of Jingellic 1:50 000 geological map
* Corryong and parts of Rosewood and Kosciusko 1:100 000 map: geological interpretation of geophysical features
* A Geoscientific data CD containing the digital information relevant to the area (including mining and open-file company exploration data).

Simplified geological map of CORRYONG.

 

Contacts
For further information contact:
Peter O’Shea
Manager, Regional Mapping
Ph: (03) 9658 4525
Fax: (03) 9658 4555
Peter.O’Shea@dpi.vic.gov.au

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© The State of Victoria, 1996 - 2007.
This document was published on 28/06/2007.

http://www.dpi.vic.gov.au/dpi/nrenmp.nsf/FID/-8347BB3E13A11D7A4A256AB100164C26?OpenDocument


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