3D Victoria Report 9 - Spatial analysis of gravity gradients (worms) and fault architecture in Victoria
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Product description:Summary The interpretation of potential field data can be problematical as there is no unique geological solution to a mass distribution. The use of an automated edge detection technique (“worms”) has advantages in reducing ambiguity and increasing constraints on the geological interpretation. Two such algorithms are applied to the Victorian gravity field, and their outputs processed for ease of visualisation and analysis.A primary objective in using the worm data is to help constrain a 3D architecture. There is good correlation between the GSV 1:1,000,000 scale geological coverage and the interpreted gravity architecture which adds confidence to the interpretation under cover. Elements given more emphasis in the gravity interpretation are deep seated fracture zones that cross cut the major regional scale faults and along which granites and other concealed bodies were emplaced. An additional objective is to provide a template for exploration for hydrothermal deposits where relative proximity to long strike length boundaries, as pathways for fluids, can be a factor in the localisation of mineralisation. These pathways include blind structures and boundaries without a related potential field gradient. Interpretation seeks to capture these elements through an evaluation of fault strike length. An influence on gold localisation, at the regional scale, may be where early formed northeast-southwest trending faults cross cut the regional scale northwest-southeast and north-south trending faults. Download The downloadable version of this report is supplied as a PDF file (22.9MB). Bibliographic reference Murphy, B., 2010. Spatial analysis of gravity gradients (worms) and fault architecture in Victoria. GeoScience Victoria 3D Victoria Report 9. Department of Primary Industries. | ||||||
