Interpreting Aeromagnetic Data in Areas of Limited Outcrop: an Example From the Arunta Block, Northern Territory

Gunn, Peter; Maidment, David W.; Milligan, Peter

doi:10.1071/eg995227

Cited by 16 publications

(16 citation statements)

References 3 publications

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“…Extrapolation of contacts and structural trends into areas covered by Phanerozoic sedimentary rocks (~90% of the continental U.S.) is aided by interpretation of aeromagnetic data (North American Magnetic Anomaly Group, 2002). Aeromagnetic maps have been used in the interpretation of basement lithotypes and structure, including the western United States (e.g., Lidiak, 1974;Ramberg and Smithson, 1975;Cordell and Grauch, 1985;Finn et al, 2001;Sims and Stein, 2003;Grauch et al, 2003;Finn and Sims, 2005), Canada (e.g., Pilkington et al, 2000;Ross et al, 1991), Australia (e.g., Gunn et al, 1997), and elsewhere (e.g., Henkel, 1991).…”

Section: Methodsmentioning

confidence: 99%

Untitled

2007

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This paper presents a plate-scale model for the Precambrian growth and evolution of the North American continent. The core of the North American continent (Canadian shield) came together in the Paleoproterozoic (2.0-1.8 Ga) by plate collisions of Archean continents (Slave with Rae-Hearne, then Rae-Hearne with Superior) as well as smaller Archean continental fragments (Wyoming, Medicine Hat, Sask, Marshfi eld, Nain cratons). The resulting Trans-Hudson orogen was a collisional belt similar in scale to the modern Himalayas. It contains mainly reworked Archean crust, but remnants of juvenile volcanic belts are preserved between Archean masses. The thick, buoyant, and compositionally depleted mantle lithosphere that now underlies North America, although dominantly of Archean age, took its present shape by processes of collisional orogenesis and likely has a scale of mantle heterogeneity similar to that exhibited in the overlying crust.In marked contrast, lithosphere of southern North America (much of the conti nental United States) was built by progressive addition of a series of dominantly juvenile vol canic arcs and oceanic terranes accreted along a long-lived southern (present coordinates) plate margin. Early juvenile additions ( Pembine-Wausau, Elves Chasm arcs) formed at the same time (1.84-1.82 Ga) the core was assembling. Following fi nal assembly of the Archean and Paleoproterozoic core of North America by 1.8 Ga, major accretionary provinces (defi ned mainly by isotopic model ages) were added by arc-continent accretion, analogous to present-day convergence between Australia and Indonesia. Also similar to Indonesia, some accreted terranes contain older continental crustal material [Archean(?) Mojavia], but the extent and geometry of older crust are not well known. Accretion-ary provinces are composed of numerous 10 to 100 km scale terranes or blocks, separated by shear zones, some of which had compound histories as terrane sutures and later crustalassembly structures. Major northeast-trending provinces are the Yavapai province (1.80-1.70 Ga), welded to North America during the 1.71-1.68 Ga Yavapai orogeny; the Mazatzal province (1.70-1.65 Ga), added during the 1.65-1.60 Ga Mazatzal orogeny; the Granite-Rhyolite province (1.50-1.30 Ga), added during the 1.45-1.30 Ga tectonic event associated with A-type intracratonic magmatism; and the Llano-Grenville province (1.30-1.00 Ga), added during the 1.30-0.95 Ga broader Grenville orogeny. During each episode of addition of juvenile lithosphere, the transformation of juvenile crust into stable continental lithosphere was facilitated by voluminous granitoid plutonism that stitched new and existing orogenic boundaries. Slab roll back created transient extensional basins (1.70 and 1.65 Ga) in which Paleoproterozoic quartziterhyolite successions were deposited, then thrust imbricated as basins were inverted.The lithospheric collage that formed from dominantly juvenile terrane accretion and stabilization (1.8-1.0 Ga) makes up about half of the present-day North American con...

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Section: Methodsmentioning

confidence: 99%

Untitled

2007

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“…1). Because of its prominence, the Cork Fault has been interpreted to represent a major feature associated with the Neoproterozoic break-up of Rodinia (Finlayson et al, 1988;Gunn et al, 1997;Murray and Kirkegaard, 1978;Shaw et al, 1996;Veevers, 2000;Veevers and Powell, 1984).…”

Section: Introductionmentioning

confidence: 99%

Imaging the basement architecture across the Cork Fault in Queensland using magnetic and gravity data

Spampinato

Aillères

Betts

et al. 2015

Precambrian Research

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“…A magnetic anomaly's amplitude is closely correlated with its magnetization, which depends on the rocks' magnetic susceptibility According to Gunn et al (1997), in low magnetic latitude areas like Nigeria, low susceptible magnetic features can look as high magnetic anomalies and vice versa. Hence, the residual magnetic intensity image depicts fewer magnetically susceptible areas as high magnetic values indicated at Dogo ruwa which is the license area where mining activities taken place depicted on the local geological map figure (1) according to Solomon (2022).…”

Section: The Residual Mapmentioning

confidence: 99%

Reassessment of Geophysical Investigation of Zinc(Z), Cupper (Cu) and Lead (Pb) Potential Mineralization Deposits using Aeromagnetic Data in Wase Middle Benue Trough, Nigeria

Babagana¹,

Adamu²,

Idris³

et al. 2023

IJRASET

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This effort aims to delineate structures responsible for exploring mineral resources in the Wase middle Benue trough area of Northcentral, Nigeria by evaluating the aeromagnetic data over that region. Oasis Montaj version 6.4 was used to qualitatively and quantitatively evaluate the aeromagnetic data. Techniques for Source Parameter Imaging (SPI) interpretation, including First Vertical Derivative, Analytical Signal, Upward Continuation, and Tilt Derivative, were used in the study. Analytic signal and tilt derivative maps showed different patterns of magnetic signatures independent of magnetization direction with amplitude ranging from 0.1 to 0.2nT/m and -1.3 to 1.4nT/m. They also showed qualitative interpretation applied aids enhance linear features at the expense of deep intrusive bodies like lineaments, fractures, and fault zones which trend Northeast Southwest (NE- SW) in the map of the study area. The boundaries of the geologically interesting anomalies were noticeably accentuated by the upward continuation done at 2 km. Nonetheless, this provides an approximation of the depth of the source of magnetic signatures in the area. The depth measured by SPI ranged from 103.9 to 1473.0 m. In the Eastern and Western regions of the region, respectively, shallow and deep-seated bodies are seen. The depth of the analysis was about 2000m, in conclusion, it was believed that the linear characteristics in the area that are trending northeast to southwest are possible structures for the prospecting of mineral deposits like zinc, copper, and lead

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Interpreting Aeromagnetic Data in Areas of Limited Outcrop: an Example From the Arunta Block, Northern Territory

Cited by 16 publications

References 3 publications

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Imaging the basement architecture across the Cork Fault in Queensland using magnetic and gravity data

Reassessment of Geophysical Investigation of Zinc(Z), Cupper (Cu) and Lead (Pb) Potential Mineralization Deposits using Aeromagnetic Data in Wase Middle Benue Trough, Nigeria

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