The role of strain localization in the segregation and ascent of anatectic melts, Namaqualand, South Africa

Journal of Structural Geology

Volumn 20, Issue 2-3, 1998, Pages 229-242

  Kisters, Alexander F M ^a,b   Gibson, Roger L ^b   Charlesworth, E Guy ^b   Anhaeusser, Carl R ^b  

^a RWTH AACHEN UNIVERSITY   (Germany)

^b UNIVERSITY OF THE WITWATERSRAND   (South Africa)

Author keywords

[No Author keywords available]

Indexed keywords

DEFORMATION; LITHOLOGY; MASS TRANSFER; MECHANICAL PERMEABILITY; PETROLOGY; STRAIN; TECTONICS;

ANATECTIC MELTS; GNEISS; MIGMATITE; STRAIN LOCALIZATION;

STRUCTURAL GEOLOGY;

ANATECTIC MELT; METAMORPHISM; STRAIN LOCALIZATION;

SOUTH AFRICA, NAMAQUALAND;

EID: 0032004284     PISSN: 01918141     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0191-8141(97)00081-3     Document Type: Article

References (57)

1. Allibone, A. H. and Norris, R. J. (1992) Segregation of leucogranite plutons during syn-anatectic deformation: an example from the Taylor Valley, Antarctica. Journal of Metamorphic Geology 10, 589-600.
2. Andreoli, M. A. G. and Hart, R. J. (1987) Explosive KREEP-norite from Namaqualand, South Africa, with implications for the Sudbury irruptive. International Workshop on Cryptoexplosions and Catastrophes in the Geological Record, Parys, South Africa, abstracts, 1-8.
3. Benedict, P. C., Wiid, D. de N., Cornelissen, A. K. and Staff (1964) Progress report on the geology of the O'okiep Copper District. In The Geology of Some Ore Deposits in Southern Africa, ed. S. H. Haughton, pp. 239-302. Geological Society of South Africa, 2.
4. Brown, M. (1994) The generation, segregation, ascent and emplacement of granite magma: the migmatite-to-crustally derived granite connection in thickened orogens. Earth Science Review 36, 83-130.
5. Brown, M., Rushmer, T. and Sawyer, E. W. (1995) Introduction to special section: Mechanisms and consequences of melt segregation from crustal protoliths. Journal of Geophysical Research 100, 15551-15564.
6. Clemens, J. D. and Mawer, C. K. (1992) Granite magma transport by fracture propagation. Tectonophysics 204, 339-360.
7. Clemens, J. D. and Vielzeuf, D. (1987) Constraints on melting and magma production in the crust. Earth and Planetary Science Letters 86, 287-306.
8. Clifford, T. N., Gronow, L., Rex, D. C. and Burger, A. J. (1975) Geochronological and petrogenetic studies of high grade metamorphic rocks and intrusives in Namaqualand, South Africa. Journal of Petrology 16, 154-188.
9. Clifford, T. N., Stumpfl, E. F., Burger, A. J., McCarthy, T. S. and Rex, D. C. (1981) Mineral-chemical and isotopic studies of Namaqualand granulites, South Africa: a Grenville analogue. Contributions in Mineralogy and Petrology 77, 225-250.
10. Clifford, T. N., Barton, E. S., Relief, E. A., Rex, D. C. and Fanning, C. M. (1995) A crustal progenitor for the intrusive anorthosite-charnockite kindred of the cupriferous Koperberg Suite, O'okiep District, Namaqualand, South Africa; New isotope data for the country rocks and intrusives. Journal of Petrology 36, 231-258.
11. Cruden, A. R. (1988) Deformation around a rising diapir modelled by creeping flow past a sphere. Tectonics 7, 1091-1101.
12. Dell'Angelo, L. N. and Tullis, J. (1988) Experimental deformation of partially molten granitic aggregates. Journal of Metamorphic Geology 6, 495-515.
13. Dipple, G. M. and Ferry, J. M. (1992) Metasomatism and fluid flow in ductile fault zones. Contributions in Mineralogy and Petrology 112, 149-164.
14. D'Lemos, R. S., Brown, M. and Strachan, R. A. (1992) The relationship between granite and shear zones: magma generation, ascent and emplacement within a transpressional orogen. Journal of the Geological Society of London 149, 487-490.
15. Emerman, S. H. and Marrett, R. (1990) Why dikes? Geology 18, 231-233.
16. England, R. W. (1990) The identification of granite diapirs. Journal of the Geological Society of London 147, 931-933.
17. Gibson, R.L., Robb, L.J., Kisters, A.F.M. and Cawthorn, R.G. (1996) Regional setting and geological evolution of the Okiep Copper District, Namaqualand, South Africa. South African Journal of Geology 99.
18. Hand, M. and Dirks, P. H. G. M. (1992) The influence of deformation on the formation of axial-planar leucosomes and the segregation of small melt bodies within the migmatitic Napperby Gneiss, Central Australia. Journal of Structural Geology 14, 591-604.
19. Hartnady, C., Joubert, P. and Stowe, C. (1985) Proterozoic crustal evolution in southwestern Africa. Episodes, 236-244.
20. Hollister, L. H. and Crawford, M. L. (1986) Melt-enhanced deformation: A major tectonic process. Geology 14, 558-561.
21. Hutton, D. H. W. (1988) Granite emplacement mechanisms and tectonic controls: inferences from deformation studies. Transactions of the Royal Society of Edinburgh Earth Sciences 79, 245-255.
22. Joubert, P. (1986) The Namaqualand metamorphic complex - a summary. In Mineral Deposits of Southern Africa, eds C. R. Anhaeusser and S. Maske, Vol. 2, pp. 1395-1420. Geological Society of South Africa.
23. Kisters, A. F. M. (1993) Structural relationships of economic ore-bearers in the Okiep Copper District, Namaqualand, NW Cape. Ph.D. thesis, University of the Witwatersrand, Johannesburg.
24. Kisters, A. F. M., Charlesworth, E. G., Anhaeusser, C. R. and Gibson, R. L. (1996a) Steep structure formation in the Okiep Copper District: Bulk inhomogeneous shortening of a high-grade metamorphic granite-gneiss sequence. Journal of Structural Geology 18, 735-751.
25. Kisters, A. F. M., Charlesworth, E. G., Gibson, R. L. and Anhaeusser, C. R. (1996b) The relationship between antiformal and monoclinal steep structures in the Okiep Copper District, Namaqualand: A case study. South African Journal of Geology 99, 185-195.
26. Kisters, A. F. M., Gibson, R. L., Charlesworth, E. G. and Anhaeusser, C. R. (1992) Megabreccia formation in the Okiep Copper District. Abstract Geocongress '92, Geological Society of South Africa, Bloemfontein, 228-230.
27. Kisters, A. F. M., Potgieter, J. E., Charlesworth, E. G., Anhaeusser, C. R., Gibson, R. L. and Watkeys, M. K. (1994) Emplacement features of cupriferous noritoids in the Okiep Copper District, Namaqualand, South Africa. Exploration and Mineral Geology 3, 297-310.
28. Lombaard, A. F. and Schreuder, F. J. G. (1978) Distribution pattern and general geological features of steep structures, megabreccias and basic rocks in the Okiep Copper District. In Mineralization in Metamorphic Terranes, ed. W. J. Verwoerd, pp. 269-295. Special Publication of the Geological Society of South Africa, 4.
29. Lombaard, A. F. and the Exploration Department Staff of the O'okiep Copper Company Ltd (1986) The copper deposits of the Okiep Copper District, Namaqualand. In Mineral Deposits of Southern Africa, ed. C. R. Anhaeusser and S. Maske, Vol. 2, pp. 1421-1445. Geological Society of South Africa.
30. McCaffrey, K. J. W. (1992) Igneous emplacement in a transpressive shear zone: Ox Mountains igneous complex. Journal of the Geological Society of London 149, 221-235.
31. McIver, J. P., McCarthy, T. S. and Packham, B. de. V. (1983) The copper-bearing basic rocks of Namaqualand, South Africa. Mineralogia Deposita 18, 135-160.
32. McKenzie, D. P. (1984) The generation and compaction of partially molten rock. Journal of Petrology 25, 713-765.
33. McLellan, E. L. (1988) Migmatite structures in the Central Gneiss Complex, Boca de Quadra, Alaska. Journal of Metamorphic Geology 6, 517-542.
34. Oliver, N. H. S., Valenta, R. K. and Wall, V. J. (1990) The effect of heterogeneous stress and strain on metamorphic fluid flow, Mary Kathleen, Australia, and a model for large-scale fluid flow circulation. Journal of Metamorphic Geology 8, 311-331.
35. Paterson, S. R. and Fowler, T. K. (1993) Re-examining pluton emplacement processes. Journal of Structural Geology 15, 191-206.
36. Percival, J. A. (1989) Melt-induced fluid pumping and the source of CO2 in granulites. In Fluid Movements - Element Transport and the Composition of the Deep Crust, ed. D. Bridgewater, pp. 61-69. Kluwer, Dordrecht, The Netherlands.
37. Petford, N. (1995) Segregation of tonalitic-trondhjemitic melts in the continental crust: The mantle connection. Journal of Geophysical Research 100, 15735-15744.
38. Petford, N., Kerr, R. C. and Lister, J. R. (1993) Dike transport of granitoid magmas. Geology 21, 845-848.
39. Raith, J. G. and Prochaska, W. (1995) Tungsten deposits in the Wolfram Schist, Namaqualand, South Africa: Strata-bound versus granite-related genetic concepts. Economic Geology 90, 1934-1959.
40. Robb, L. J., Armstrong, R. A. and Waters, D. J. (1998) Timing and duration of low-pressure granulite-facies metamorphism and crustal growth in Namaqualand, South Africa: Evidence from single-zircon U-Pb geochronology. Journal of Petrology (in press).
41. Robin, P.-Y. F. (1979) Theory of metamorphic segregation and related processes. Geochimica et Cosmochimica Acta 43, 1587-1600.
42. Rushmer, T. (1995) An experimental deformation study of partially molten amphibolite: Application to low-melt fraction segregation. Journal of Geophysical Research 100, 15681-15696.
43. Rutter, E. H. and Neumann, D. H. K. (1995) Experimental deformation of partially molten Westerly Granite under fluid-absent conditions, with implications for the extraction of granitic magmas. Journal of Geophysical Research 100, 15697-15716.
44. Rutter, M. J. and Wyllie, P. J. (1988) Melting of vapour-absent tonalite at 10 kbar to simulate dehydration melting in the deep crust. Nature 331, 159-160.
45. SACS (South African Commitee for Stratigraphy) (1980) Stratigraphy of South Africa. L. E. Kent (compiler), Part 1. Handbook of the Geological Survey of South Africa 8, 690.
46. Sawyer, E. W. (1991) Disequilibrium melting and the rate of melt-residuum separation during migmatization of mafic rocks from the Grenville Front Quebec. Journal of Petrology 32, 701-738.
47. Sawyer, E. W. (1994) Melt segregation in the continental crust. Geology 22, 1019-1022.
48. Sibson, R. H., Moore, J. McM. and Rankin, A. H. (1975) Seismic pumping - a hydrothermal mechanism. Journal of the Geological Society of London 131, 653-659.
49. Stevens, G., Clemens, J. D. and Droop, G. T. R. (1995) Hydrous cordierite in granulites: experiments and phase relationships. Contributions in Mineralogy and Petrology 117, 375-393.
50. Van der Molen, I. and Paterson, M. S. (1979) Experimental deformation of partially-melted granite. Contributions in Mineralogy and Petrology 70, 299-318.
51. Waters, D. J. (1988) Partial melting and the formation of granulite facies assemblages in Namaqualand, South Africa. Journal of Metamorphic Geology 6, 387-404.
52. Waters, D. J. (1989) Metamorphic evidence for the heating and cooling path of Namaqualand granulites. In Evolution of Metamorphic Belts, pp. 269-275. Special Publication of the Geological Society, 43.
53. Waters, D. J. (1990) Thermal history and tectonic setting of the Namaqualand granulites, Southern Africa: Clues to Proterozoic crustal development. In Granulites and Crustal Evolution, ed. D. Vielzeuf and Ph. Vidal, pp. 243-256. Kluwer Academic, Dordrecht.
54. Waters, D. J. and Whales, C. J. (1984) Dehydration melting and the granulite transition in metapelites from southern Namaqualand, S. Africa. Contributions in Mineralogy and Petrology 88, 269-275.
55. Weinberg, R. F. (1993) Drops, surface tension and diapir models. Journal of Structural Geology 15, 227-232.
56. Wickham, S. M. (1987) The segregation and emplacement of granitic magmas. Journal of the Geological Society of London 144, 281-297.
57. Williams, M. L., Hanmer, S., Kopf, C. and Darrach, M. (1995) Syntectonic generation and segregation of tonalitic melts from amphibolite dikes in the lower crust, Striding-Athabasca mylonite zone, northern Sasketchewan. Journal of Geophysical Research 100, 1995.