Journal article
Redefined crustal structure of the Buchan Rift, northeast Victoria: evidence from potential field modelling of newly acquired land-based gravity data
TE Ogden, MA McLean, TJ Rawling, RA Cayley
Australian Journal of Earth Sciences | TAYLOR & FRANCIS LTD | Published : 2016
Abstract
The Buchan Rift, in northeastern Victoria, is a north–south-trending basin, which formed in response to east–west crustal extension in the Early Devonian. The rift is filled mostly with Lower Devonian volcanic and volcaniclastic rock of the Snowy River Volcanics. Although the structure and geometry of the Buchan Rift and its major bounding faults are well mapped at the surface, a discrepancy exists between the surface distribution of the thickest rift fill and its expected potential field response. To investigate this variation, two new detailed land-based gravity surveys, which span the rift and surrounding basement rocks in an east–west orientation, have been acquired and integrated with p..
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Funding Acknowledgements
The authors would like to acknowledge the Geological Survey of Victoria for funding this research. Ken Sherry and Suzanne Haydon are thanked for help with acquisition and processing. Thank you also to Abe Jones, Dani Majer-Kielbaska and Masha Pastuhov for their assistance in the field. John and Nicky from Wombargo are thanked for all their help and hospitality during each of the field seasons. Constructive reviews by Peter Betts and Mark Lackie improved the manuscript, including by expanding its scope to include a more general discussion of the mechanics of overthrust rift margins, and are greatly appreciated. Publication is with permission of the Director of the Geological Survey of Victoria.