GSV Report 109 - Nagambie and part of Yea 1:100 000 map area geological report
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Product description:Download The downloadable version of this report is supplied in PDF format and is a large file (31.1MB). Abstract This report describes the geology of the area covered by the Nagambie 1:100 000 mapsheet 7924, and the northern part of the Yea 1:100 000 mapsheet 7923. It contains a summary of previous work, and gives a comprehensive account of the physiography, geological history and landscape evolution, and structural and economic geology. The geological and geophysical characteristics of Palaeozoic and Cainozoic rock units are described, and depositional models are suggested for each. A comprehensive list of references is included, and numerous photographs and line drawings accompany the text. Particular emphasis is placed on the lithostratigraphic subdivision of the Late Silurian to Middle Devonian marine sedimentary rock sequence which accumulated on the shelf along the eastern margin of the Gondwana landmass. Mud-dominated deposition was periodically disrupted by the influx of coarser grained clastic material during discrete periods of turbidite deposition. A major period of marine transgression is recorded in the sedimentary sequence. The Wilson Creek Shale and the Norton Gully Sandstone and Montys Hut formations of the Walhalla Group are recognised in this region for the first time. Previously undifferentiated sediments are described and include the new Waranga Formation. The poorly understood Broadford and Puckapunyal formations are redefined. During the Middle Devonian Tabberabberan Deformation, Palaeozoic rocks were faulted and folded into broad north-south trending regional anticlinoria and synclinoria. Subsequent deformation created east-west trending folds in the north, and warped the early formed folds to give them doubly plunging, curvilinear axial traces producing a regional basin and dome interference pattern. During the Late Devonian, granite intruded and metamorphosed the Palaeozoic rocks. The post-Palaeozoic history is one of successive periods of uplift and erosion related to the tectonic effects of the breakup of the Gondwana landmass, and the development of a seafloor spreading centre between Australia and Antarctica. The formation of the Central Victorian Highlands and the development and subsequent infilling of the Murray Basin are discussed in relation to the regional tectonics and global eustatic and climatic oscillations. Bibliographic reference Edwards J., Olshina A. and Slater K.R., 1997. Nagambie and part of Yea 1:100 000 map geological report. Geological Survey of Victoria Report 109. Related products:
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