1887
2nd Australasian Exploration Geoscience Conference: Data to Discovery
  • ISSN: 2202-0586
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Abstract

Summary

We investigated a remanent anomaly in the main part of a Brazilian intracontinental Paleo/Mesoproterozoic rift using different geophysical methods. To enhance the anomaly signature at different depths we used RTP, DZ, THDR, 3D-AS, and UpCon techniques, generating a magnetic-structural interpretation of the main non-mapped features of the region. To identify the presence of non- induced magnetization in this particular anomaly and its total magnetization direction, we used the Maxi-Min, Magnetic Vector Inversion and Helbig’s Magnetic Moment Analysis techniques. We found total magnetization inclination and declination (I, D) of (49.10, -25.10), (46.30, -10.05) and (43.94, -19.53), respectively.

Based only on the TMI, we modelled this anomaly considering remanence using Magnetic Vector Inversion technique. Two bodies of great extension were identified at depths ranging between ~9 and 20 km. The anomaly was interpreted as a within-plate mafic pluton representing a magma chamber of continental tholeiitic association with associated feeder conduits. These results are crucial to understand the tectonic evolutional framework from this region affected by several superimposed events, including the Neoproterozoic Brasiliano Orogeny.

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/content/journals/10.1080/22020586.2019.12072923
2019-12-01
2026-01-19

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References

  1. Almeida, T. 2009. Contribuição das imagens R99sar e de dados geofísicos para o mapeamento geológico do Rifte Araí, nordeste de Goiás: Ph.D. thesis, Universidade de Brasília.
  2. Alvarenga, C.J.S., Botelho, N.F., Dardenne, M.A., Lima, O.T.B., and Almeida, T., 2007a, Mapa Geológico da Folha SD.23-V-C-VI — Nova Roma — Escala: 1:100.000 (Cartas, mapas ou similares/Mapa).
  3. Alvarenga, C.J.S., Botelho, N.F., Dardenne, M.A., Lima, O.N.B., and Machado, M.A., 2007b, Nota Explicativa das folhas SD.23-V-C-III (Monte alegre de Goiás), SD.23-V- C-V (Cavalcante), SD.23-V-C-VI (Nova Roma) — Escala: 1:100.000, CPRM, 67.
  4. Blum, M. L. B., 1999, Processamento e interpretação de dados de geofísica aérea no Brasil Central e sua aplicação à geologia regional e à prospecção mineral: Ph.D. thesis, Universidade de Brasília.Botelho, N.F., Alvarenga, C.J.S., Dardenne, M.A., and Almeida, T., 2007, Mapa Geológico da Folha SD.23-V-C-V — Cavalcante — Escala: 1:100.000 (Cartas, mapas ou similares/Mapa).
  5. Botelho, N.F., Dantas, E.L., Laux, J.H., and Junges, S.L., 2006, The Paleoproterozoic peraluminous Aurumina granite suite, Goiás and Tocantins: Whole-rock geochemistry and Sm-Nd isotopic constraints: The Paleoproterozoic Record of the São Francisco Craton, Brazil, IGCP, Expanded Abstracts, 9-21.
  6. Cooper, G.R.J., and Cowan, D.R., 2004, Filtering using variable order vertical derivatives: Computers & Geosciences, 30, 455-459.
  7. Cordani, R., and Shukowsky, W., 2009, Virtual Pole from Magnetic Anomaly (VPMA): A procedure to estimate the age of a rock from its magnetic anomaly only: Journal of Applied Geophysics, 69(2), 96-102.
  8. Cordell, L., and Grauch, V.J.S., 1985, Mapping basement magnetization zones from aeromagnetic data in the San Juan basin, New Mexico, In: W. J. Hinze (ed.), The utility of regional gravity and magnetic anomaly maps: SEG, 181-197.
  9. Cuadros, F.A., Botelho, N.F., Fuck, R.A., and Dantas, E.L., 2017a, The peraluminous Aurumina granite suite in central Brazil: An example of mantle-continental crust interaction in a Paleoproterozoic cordilleran hinterland setting?: Precambrian Research, 299, 75-100.
  10. Cuadros, F.A., Botelho, N.F., Fuck, R.A., and Dantas, E.L., 2017b, The Ticunzal Formation in central Brazil: Record of Rhyacian sedimentation and metamorphism in the western border of the São Francisco Craton: Journal of South American Earth Sciences, 79, 307-325.
  11. Ellis, R.G., de Wet, B., and MacLeod, I.N., 2012, Inversion of magnetic data for remanent and induced sources: 22nd International Geophysical Conference and Exhibition, ASEG, Brisbane, Extended Abstracts , 1-4.
  12. Fedi, M., Florio, G., Rapolla, A.,1994, A method to estimate the total magnetization direction from a distortion analysis of magnetic-anomalies: Geophysical Prospecting, 42 (3), 261-274.
  13. Fuck, R.A., Dantas, E.L., Pimentel, M.M., Botelho, N.F., Armstrong, R., Laux, J.H., Junges, S.L., Soares, J.E.P., and Praxedes, I.F., 2014, Paleoproterozoic crust-formation and reworking events in the Tocantins Province, Central Brazil: A contribution for Atlantica supercontinent reconstruction: Precambrian Research, 244, 53-74.
  14. Helbing, K., 1963, Some integrals of magnetic anomalies and their relation to the parameters of the disturbing body: Zeitschrift für Geophysik, 29, 83–96.
  15. Isles, D.J., and Rankin, L.R., 2013, Geological interpretation of aeromagnetic data: ASEG.
  16. Jacobsen, B.H., 1987, A case for upward continuation as a standard separation filter for potential-field maps: Geophysics, 52, 1138-1148.
  17. Klein, E.L., and Moura, C.A.V., 2008, São Luís craton and Gurupi belt (Brazil): possible links with the West-African craton and surrounding Pan-African belts, In: Pankhurst, R.J., Trouw, R.A.J., Brito Neves, B.B., de Wit, M.J. (Eds.), West Gondwana: Pre-Cenozoic Correlations Across the South Atlantic Region: Geological Society, London, Special Publications, 294, 137–151.
  18. Li, X., 2006, Understanding 3D analytic signal amplitude: Geophysics, 71, 13-16.
  19. Li, Y., and Oldenburg, D.W., 1996, 3-D inversion of magnetic data: Geophysics, 61, 394-408.
  20. Macleod, I.N., and Ellis, R.G., 2013, Magnetic Vector Inversion, a Simple Approach to the Challenge of Varying Direction of Rock Magnetization: 23rd International Geophysical Conference and Exhibition, ASEG, Melbourne, Extended Abstracts, 1-6.
  21. Marini, O.J., Fuck, R.A., Dardenne, M.A., and Danni, J.C.M., 1984, Província Tocantins: setores central e sudeste, In: Almeida, F.F.M., Hasui, Y. (Eds.), O Pré-Cambriano do Brasil: Edgard Blücher Ltd, 205-264.
  22. Moro, P.S., Vidotti, R.M., and Dantas, E.L, 2018, Structural framework from gravity and magnetic data in the paleo/mesoproterozoic Araí rift-sag Basin, Central Brazil: Geophysics, 83(4), B195-B207.
  23. Nabighian, M.N., Ander, M.E., Grauch, V.J.S., et al., 2005, Historical development of the magnetic method in exploration: Geophysics, 70, 33ND-61ND.
  24. Phillips, J.D., 2005, Can we estimate magnetization directions from aeromagnetic data using Helbig’s integrals?: Earth Planets Space, 57, 681-689.
  25. Phillips, J.D., Nabighian, M.N., Smith, D.V., and Li, Y., 2007, Estimating locations and total magnetization vectors of compact magnetic sources from scalar, vector, or tensor magnetic measurements through combined Helbig and Euler analysis: 77th Annual Meeting, SEG, San Antonio, Texas, 23-28.
  26. Pilkington, M., and Tschirhart, V., 2017, Practical considerations in the use of edge detectors for geologic mapping using magnetic data: Geophysics, 82(3), J1-J8.
  27. Pimentel, M.M., and Botelho, N.F., 2001, Sr and Nd isotopic characteristics of 1, 77-1, 58 Ga rift-related granites and volcanics of the Goiás tin province, Central Brazil: Anais da Academia Brasileira de Ciências, 73, 263-276.
  28. Pimentel, M.M., Fuck, R.A., and Botelho, N.F., 1999, Granites and the geodynamic history of the neoproterozoic Brasília belt, Central Brazil: a review: Lithos, 46, 463-483.
  29. Pimentel, M.M., Heaman, L., Fuck, R.A., and Marini, O.J., 1991, U-Pb zircon geochronology of Precambrian tin- bearing continental-type acid magmatism in central Brazil: Precambrian Research, 52, 321-335.
  30. Pimentel, M.M., Jost, H., and Fuck, R.A., 2004, O embasamento da Faixa Brasília e o Arco Magmático de Goiás, In: Mantesso-Neto, V., Bartorelli, A., Carneiro, C.D.R., Brito-Neves, B.B. (Eds.), Geologia do continente Sul-Americano: evolução da obra de Fernando Flávio Marques de Almeida: Ed. Beca, 355-368.
  31. Roest, W.R., Verhoef, J., and Pilkington, M., 1992, Magnetic interpretation using the 3D analytic signal: Geophysics, 57(1), 116–125.
  32. Sousa, I.M.C., Giustina, M.E.S.D., and Oliveira, C.G., 2016, Crustal evolution of the northern Brasília Belt basement, central Brazil: A Rhyacian orogeny coeval with a pre- Rodinia supercontinent assembly: Precambrian Research, 273, 129-150.
  33. Souza, J. D., Kosin, M., Heineck, C.A., et al., 2004, Folha SD.23, In: Schobbenhaus, C., Gonçalves, J.H., Santos, J.O.S., Abram, M.B., Leão Neto, R., Matos, G.M.M., Vidotti, R.M., Ramos, M.A.B., and Jesus, J.D.A. (eds.), Carta Geológica do Brasil ao Milionésimo, Sistemas de Informações Geográficas-SIG: Programa Geologia do Brasil, CD-ROM.
  34. Unrug, R., 1996, The Assembly of Gondwanaland: Episodes, 19, 11-20.
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  • Article Type: Research Article
Keyword(s): inversion; magnetic; Proterozoic; remanent; rift

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