2.5-D gravity model of the Ni-Cu-PGM mineralized Mount Ayliff Intrusion (Insizwa complex), South Africa

Journal of Applied Geophysics

Volumn 35, Issue 1, 1996, Pages 27-43

  Sander, B K ^a   Cawthorn, R G ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

COPPER NICKEL DEPOSITS; EXPLORATORY BOREHOLES; GEOLOGIC MODELS; GRAVITATIONAL PROSPECTING; ORE DEPOSIT GEOLOGY; TECTONICS;

FAULT LINEAMENTS; GEOLOGICAL TRANSGRESSIONS; GRAVITY ANOMALIES; INTRUSIONS;

MINERAL EXPLORATION;

COPPER; IGNEOUS INTRUSION; MINERALIZATION; NICKEL; PGE; PICRITE;

SOUTH AFRICA, TRANSKEI, MOUNT AYLIFF INTRUSION;

EID: 0030304999     PISSN: 09269851     EISSN: None     Source Type: Journal    
DOI: 10.1016/0926-9851(95)00027-5     Document Type: Article

References (38)

1. Bruynzeel, D., 1957, A petrographic study of the Waterfall Gorge profile at Insizwa. Ann. Univ. Stellenbosch, 33: 481-538.
2. Busby, J.P., 1987. An interactive Fortran 77 program using GKS graphics for 2.5D modelling of gravity and magnetic data. Comput. Geosci., 13(6): 639-644.
3. Caston, D.L., 1979. 1:250,000 Geological Sheet 3128 Umtata. Geol. Surv. S. Afr., Pretoria.
4. Cawthorn, R.G., De Wet, M., Hatton, C.J. and Cassidy, K.F., 1991. Titanium-rich chromite from the Mount Ayliff Intrusion, Transkei: Further evidence for high Ti tholeiitic magma. Am. Mineral., 76: 561-573.
5. Chai, G. and Naldrett, A.J., 1992. Characteristics of Ni-Cu-PGE mineralization and genesis of the Jinchuan Deposit, northwest China. Econ. Geol., 87; 1475-1495.
6. Coggon, J.H., 1976. Magnetic and gravity anomalies of polyhedra. Geoexploration, 14: 93-105.
7. De Decker, R.H., 1981. Geology of the Kokstad area. 1: 250 000 Geological Sheet 3028 Kokstad and Explanation. Geol. Surv. S. Afr., Pretoria.
8. Dobrin, M.B., 1976. Introduction to Geophysical Prospecting. McGraw-Hill, New York, NY, 3rd ed., 630 pp.
9. Du Toit, A.L., 1910. Report on the copper-nickel deposits of the Insizwa Intrusion, Mount Ayliff, East Griqualand. 15th Annu. Rep. Cape of Good Hope Geol. Comm., Dep. Mines, Cape Town, 111 pp.
10. Götze, H.-J. and Lahmeyer, B., 1988. Application of three-dimensional interactive modelling in gravity and magnetics. Geophysics, 53(8): 1096-1108.
11. Grant, F.S. and West, G.F., 1965. Interpretation Theory in Applied Geophysics. McGraw-Hill, New York, NY, 584 pp.
12. Johnson, G.R. and Olhoeft, G.R., 1984. Density of rocks and minerals. In: R.S. Carmichael (Editor), Handbook of Physical Properties of Rocks, III. CRC Press, Orlando, FL, pp. 1-38.
13. Lightfoot, P.C. and Naldrett, A.J., 1983. The geology of the Tabankulu section of the Insizwa Complex. Transkei, Southern Africa, with reference to the nickel sulphide potential. Geol. Soc. S. Afr. Trans., 86(3): 169-187.
14. Lightfoot, P.C., Naldrett, A.J. and Hawkesworth, C.J., 1984. The geology and geochemistry of the Waterfall Gorge section of the Insizwa Complex with particular reference to the origin of the nickel sulphide deposits. Econ. Geol., 79: 1857-1879.
15. MacDougall, J.D., 1988. Continental Flood Basalts. Kluwer, Dordrecht, 360 pp.
16. Maske, S. and Cawthorn, R.G., 1986. The nickel occurrence in the Insizwa Complex, Transkei. In: C.R. Anhaeusser and S. Maske (Editors), Mineral Deposits of South Africa, 2. Geol. Soc. S. Afr., pp. 2149-2158.
17. McClay, K.R. and Campbell, I.H., 1976. The structure and shape of the Jimberlana Intrusion, Western Australia, as indicated by an investigation of the Bronzite Complex. Geol. Mag., 113(2): 129-139.
18. McQuillin, J. and Tuson, J., 1963. Gravity measurements over the Rhum Tertiary plutonic complex. Nature, 199: 1276-1277.
19. Naldrett, A.J., 1992. A model for the Ni-Cu-PGE ores of the Noril'sk Region and its application to other areas of flood basalt. Econ. Geol., 87: 1945-1962.
20. Naldrett, A.J. and Cabri, L.J., 1976. Ultramafic and related mafic rocks: their classification and genesis with special reference to the concentration of nickel sulphides and platinum-group elements. Econ. Geol., 71: 1131-1158.
21. Naldrett, A.J., Duke, J.M., Lightfoot, P.C. and Thompson, J.F.H., 1984. Quantitative modelling of the segregation of magmatic sulphides: an exploration guide. CIM Bull., 77(864): 46-56.
22. Naldrett, A.J., Fedorenko, V.A., Lightfoot, P.C., Kunilov, V.I., Gorbachev, N.S., Doherty, W. and Johan, Z., 1995. Ni-Cu-PGE deposits of Noril'sk region, Siberia: their formation in conduits for flood basalt volcanism. Trans. Inst. Min. Metall. B Appl. Earth Sci., 104: 18-36.
23. Nettleton, L.L., 1954. Regionals, residuals and structures. Geophysics, 19(1); 1-22.
24. Norton, D., Taylor, H.P. Jr. and Bird, D.K., 1984. The geometry and high-temperature brittle deformation of the Skaergaard Intrusion. J. Geophys. Res., 89: 10,178-10,192.
25. Podmore, F. and Wilson, A.M., 1987. A reappraisal of the structure and emplacement of the Great Dyke, Zimbabwe. In: H.C. Halls and W.F. Fahrig (Editors), Mafic Dyke Swarms. Geol. Assoc. Can. Spec. Pap., 34: 317-330.
26. Rasmussen, R. and Pedersen, L.B., 1979. End corrections in potential field modelling. Geophys. Prospect., 27: 749-760.
27. Sander, B.K., 1993. Aspects of the geology and sulphide ore potential of the Mount Ayliff Intrusion, Transkei. Ph.D. thesis. Dep. Geol., Univ. Witwatersrand, 370 pp. (2 vols.).
28. Sander, B.K. and Cawthorn, R.G., 1989. Gravity and magnetic signatures of the Mount Ayliff Intrusion, Transkei, and their application to Ni-Cu-PGE ore potential. In: M.D. Prendergast and M.J. Jones (Editors), Magmatic Sulphides - The Zimbabwe Volume. Spec. Publ. Inst. Min. Metall., London, pp. 229-247.
29. Scholtz, D.L., 1936. The magmatic nickeliferous ore deposits of East Griqualand and Pondoland. Trans. Geol. Soc. S. Afr., 39: 81-210.
30. Shuey, R.T. and Pasquale, A.S., 1973. End corrections in magnetic profile interpretation. Geophysics, 38(3): 507-512.
31. Smit, P.J., 1962. The Gravity Survey of the Republic of South Africa. Geol. Surv. Rep. S. Afri., Dep. Mines, Handb. 3(1).
32. Smit, P.J. and Maree, B.D., 1966. Densities of South African rocks for the interpretation of gravity anomalies. Geol. Surv. S. Afr. Bull., 48, 37 pp.
33. Talwani, M., Worzel, J.L. and Landisman, M., 1959. Rapid gravity computations for two-dimensional bodies with application to the Mendocino submarine fracture zone. J. Geophys. Res., 64(1): 49-59.
34. Telford, W.M., Geldart, L.P., Sheriff, R.E. and Keys, D.A., 1976. Applied Geophysics. Cambridge Univ. Press, Cambridge, 860 pp.
35. Thomas, R.J., 1989. A tale of two tectonic terranes. S. Afr. J. Geol., 92(4): 306-321.
36. Visser, D.J.L. et al., 1984. Geological map of the Republic of South Africa, Transkei, Ciskei, Lesotho and Swaziland. Gravity edition. Dep. Miner. Energy Affairs, Geol. Surv., Rep. S. Afr.
37. Walker, F. and Poldervaart, A., 1949. Karoo dolerites in the Union of South Africa. Bull. Geol. Soc. Am., 60: 591-706.
38. Yoder, H.S., 1988. The great basaltic 'floods'. A.L. Du Toit Memorial Lectures No. 20. S. Afr. J. Geol., 91(2): 139-156.