Constraints on the tectonometamorphic evolution of the Western Ethiopian Shield

Precambrian Research

Volumn 133, Issue 3-4, 2004, Pages 305-327

  Johnson, Timothy E ^a   Ayalew, Teklewold ^b   Mogessie, Aberra ^a   Kruger, F Johan ^c   Poujol, Marc ^d  

^a UNIVERSITY OF GRAZ   (Austria)

^b ADDIS ABABA UNIVERSITY   (Ethiopia)

^c UNIVERSITY OF THE WITWATERSRAND   (South Africa)

^d MEMORIAL UNIVERSITY OF NEWFOUNDLAND   (Canada)

Author keywords

East African Orogen; Gondwana; Metamorphism; Neoproterozoic; Structure; Western Ethiopian Shield

Indexed keywords

CRATON; LITHOLOGY; METAMORPHISM; PROTEROZOIC; TECTONICS;

ANALYTIC METHOD; ARTICLE; CHEMISTRY; EVOLUTION; GEOCHEMISTRY; GEOLOGY; ROCK;

AFRICA; EAST AFRICA; ETHIOPIA; SUB-SAHARAN AFRICA;

EID: 3342913661     PISSN: 03019268     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.precamres.2004.05.007     Document Type: Article

References (64)

1. Abdelsalam M.G., Stern R.J. Sutures and shear zones in the Arabian-Nubian Shield. J. Afr. Earth Sci. 23:1996;289-310
2. Abraham, A., 1989. Tectonic History of the Pan-African Low Grade Belt of Western Ethiopia. Ethiopian Institute of Geological Surveys, note no. 305, 22 pp.
3. Alemu, T., Abebe, T., 2000. Geology of the Gimbi Area. Geological Survey of Ethiopia, Memoir 15, 158 pp.
4. Allen A., Tadesse G. Geological setting and tectonic subdivision of the Neoproterozoic orogenic belt of Tuludimtu, western Ethiopia. J. Afr. Earth Sci. 36:2003;329-343
5. Augustithis S.S. Mineralogical and geochemical studies of the platiniferous dunite-birbirite-pyroxenite complex of Yubdo/Birbir, W. Ethiopia. Chemie der Erde. 24:1965;159-196
6. Ayalew, T., Bell, K., Moore, J.M., 1987. Magmatic arc intrusive complexes in the Birbir Domain, western Ethiopia. In: Current Research in African Earth Sciences. Balkema, Rotterdam, pp. 113-116.
7. Ayalew, T., Moore, J.M., 1989. The Gore-Gambella Geotraverse, Western Ethiopia: Open File Report. IDRC, 153 pp.
8. Ayalew T. Metamorphic and structural evolution of the Gore-Gambella area, Western Ethiopia. SINET: Ethiop. J. Science. 20:1997;235-259
9. Ayalew T., Peccerillo A. Petrology and geochemistry of the Gore-Gambella plutonic rocks: implications for magma genesis and the tectonic setting of the Pan-African Orogenic Belt of western Ethiopia. J. Afr. Earth Sci. 27:1998;397-416
10. Ayalew T., Bell K., Moore J.M., Parrish R.R. U-Pb and Rb-Sr geochronology of the Western Ethiopian Shield. Geol. Soc. Am. Bull. 102:1990;1309-1316
11. Bell K., Dodson M.H. The geochronology of the Tanzanian Shield. J. Geol. 89:1981;109-128
12. Berhe S.M. Ophiolites in Northeast and East Africa: implications for Proterozoic crustal growth. J. Geol. Soc. Lond. 147:1990;41-57
13. Bonavia F.F., Chorowicz J. Northward expulsion of the Pan-African of northeast Africa guided by a reentrant zone of the Tanzania craton. Geology. 20:1992;1023-1026
14. Braathen A., Grenne T., Selassie M.G., Worku T. Juxtaposition of Neoproterozoic units along the Baruda-Tulu Dimtu shear-belt in the East African Orogen of western Ethiopia. Precambrian Res. 107:2001;215-234
15. Davidson, A., 1983. The Omo River Project: Reconnaissance Geology and Geochemistry of parts of Illubabaor, Kefa, Gemu Gofa and Sidamo, Ethiopia. Ethiopian Institute of Geological Surveys, Bulletin 2, 89 pp.
16. DePaolo D.J. Neodymium isotopes in the Colorado Front Range and implications for crust formation and mantle evolution in the Proterozoic. Nature. 291:1981;193-197
17. de Wit, M.J., Chewaka, S., 1981. Plate tectonic evolution of Ethiopia and the origin of its mineral deposits: an overview. In: Plate Tectonics and Metallogenesis: Some Guidelines to Ethiopian Mineral Deposits. Ethiopian Institute of Geological Surveys, Bulletin 2, pp. 115-119.
18. 3+ concentrations in ferromagnesian silicates using stoichiometric criteria. Mineral. Mag. 51:1987;431-435
19. 2. Contrib. Mineral. Petrol. 106:1991;286-295
20. Gabert, G., 1984. Structural-lithologic units of Proterozoic rocks in East Africa, their base, cover and mineralization. In: Klerkx, J., Michot, J. (Eds.), African Geology, pp. 11-22.
21. Gichile S. Granulites in the Precambrian basement of southern Ethiopia: geochemistry, P-T conditions of metamorphism and tectonic setting. J. Afr. Earth Sci. 15:1992;251-263
22. Gichile S., Fyson W.K. An inference of the tectonic setting of the Adola Belt of southern Ethiopia from geochemistry of magmatic rocks. J. Afr. Earth Sci. 16:1993;235-246
23. Grenne, T., Braathen, A., Selassie, M.G., Worku, T., 1998. Results and models from fieldwork in the Meso-Neoproterozoic belt of eastern Ethiopia: the Wembera-Baruda-Bulen-Kilaj transect of the Metekel zone. Norges geologiske undersokelse Report 98.
24. Grenne T., Pedersen R.B., Bjerkgård T., Braathen A., Selassie M.G., Worku T. Neoproterozoic evolution of Western Ethiopia: igneous geochemistry, isotope systematics and U-Pb ages. Geol. Mag. 140:2003;373-395
25. Harris N.B.W., Hawkesworth C.J., Ries A.C. Crustal evolution in north-east and east Africa from model Nd ages. Nature. 309:1984;773-776
26. Holland T.J.B., Powell R. An internally consistent thermodynamic data set for phases of petrological interest. J. Metamorph. Geol. 16:1998;309-343
27. Kazmin V. Granulites in Ethiopian basement. Nature. 240:1972;90-92
28. Kazmin V., Shiferaw A., Balcha T. The Ethiopian basement: stratigraphy and possible manner of evolution. Geol. Runds. 67:1978;531-546
29. Kazmin V., Tefera M., Berhe S.M., Chewaka S. Precambrian structure and metallogeny of western Ethiopia. Ann. Geol. Surv. Egypt. 9:1979;1-18
30. Kebede T., Koeberl C., Koller F. Geology, geochemistry and petrogenesis of intrusive rocks of the Wallagga area, western Ethiopia. J. Afr. Earth Sci. 29:1999;715-734
31. Kebede T., Koeberl C., Koller F. Magmatic evolution of the Suquii-Wagaa garnet-bearing two-mica granite, Wallagga area, western Ethiopia. J. Afr. Earth Sci. 32:2001a;193-221
32. Kebede T., Kloetzli U.S., Koeberl C. U/Pb and Pb/Pb zircon ages from granitoid rocks of Wallagga area: constraints on magmatic and tectonic evolution of Precambrian rocks of western Ethiopia. Mineral. Petrol. 71:2001b;251-271
33. Kebede T., Koeberl C. Petrogenesis of A-type granitoids from the Wallagga area western Ethiopia: constraints from mineralogy, bulk-rock chemistry, Nd and Sr isotopic compositions. Precambrian Res. 121:2003;1-24
34. Kretz R. Symbols for rock forming minerals. Am. Mineral. 68:1983;277-279
35. Kröner A. Precambrian mobile belts of southern and eastern Africa-ancient sutures or sites of ensialic mobility? A case for crustal evolution towards plate tectonics. Tectonophysics. 40:1977;101-135
36. Kröner A. Ophiolites and the evolution of tectonic boundaries in the late Proterozoic Arabian-Nubian Shield of northeastern Africa and Arabia. Precambrian Res. 27:1985;277-300
37. Kröner A., Linnebacher P., Stern R.J., Reischmann T., Manton W., Hussein I.M. Evolution of Pan-African island-arc assemblages in the southern Red Sea Hills, and southwestern Arabia as exemplified by geochemistry and geochronology. Precambrian Res. 53:1991;99-118
38. Kusky T.M., Stern R.J., Tucker R.D. Evolution of the East African and related orogens, and the assembly of Gondwana. Precambrian Res. 123:2003;81-85
39. Loizenbauer J., Wallbrecher E., Fritz H., Neumayr P., Khudeir A.A., Kloetzli U. Structural geology, single zircon ages and fluid inclusion studies of the Meatiq metamorphic core complex: implications for Neoproterozoic tectonics in the Eastern Desert of Egypt. Precambrian Res. 110:2001;357-383
40. Ludwig, K.R., 1993. A Computer Program for Processing Pb-U-Th Isotope Data, Version 1.24, Denver. United States Geological Survey, Open File Report, 88-542, 32 pp.
41. Ludwig K.R. On the treatment of concordant uranium-lead ages. Geochim. Cosmochim. Acta. 62:1998;665-676
42. ®. Bekerley Geochronology Center Special Publication 1a, Bekerley, USA, 54 pp.
43. Meert J.G. A synopsis of events related to the assembly of eastern Gondwana. Tectonophysics. 362:2003;1-40
44. Mogessie A., Belete K.H., Hoinkes G. Yubdo-Tulu Dimtu mafic-ultramafic belt, Alaskan-type intrusions in western Ethiopia: its implication to the Arabian-Nubian Shield and tectonics of the Mozambique belt. J. Afr. Earth Sci. 30:2000;62
45. Moore, J.M., Morgan, J., Tefera, M., Teklay, M., 1987. Geology of the Gore-Gambella geotraverse, western Ethiopia. In: Current Research in African Earth Sciences. Balkema, Rotterdam, pp. 109-112.
46. Morrison G.W. Characteristics and tectonic setting of shoshonite rock association. Lithos. 13:1980;97-108
47. Pearce, J.A., 1982. Trace element characteristics of lavas from destructive plate boundaries. In: Thorpe, R.S. (Ed.), Orogenic Andesites and Related Rocks. New York, pp. 525-548.
48. Poujol M., Anhaeusser C.R. The Johannesburg Dome, South Africa: new single zircon U-Pb isotopic evidence for early Archaean granite- greenstone development within the central Kaapvaal Craton. Precambrian Res. 108:2001;139-157
49. Powell R., Holland T.J.B. An internally consistent thermodynamic dataset with uncertainties and correlations. III. Application methods, worked examples and a computer program. J. Metamorph. Geol. 6:1988;173-204
50. Powell R., Holland T.J.B. Optimal geothermometry and geobarometry. Am. Mineral. 79:1994;120-133
51. Shackleton, R.M., 1986. Precambrian collision tectonics in Africa. In: Coward, M.P., Ries, A.C. (Eds.), Collision Tectonics. Geological Society Special Publication 19. London, pp. 329-352.
52. Shackleton R.M. The final collision zone between East and West Gondwana: where is it? J. Afr. Earth Sci. 23:1996;271-287
53. 2O. Contrib. Mineral. Petrol. 101:1989;149-164
54. Stacey J.S., Kramers J.D. Approximation of terrestrial lead isotope evolution by a two stage model. Earth Planet. Sci. Lett. 26:1975;207-221
55. Stern R.J. Arc assembly and continental collision in the Neoproterozoic East African orogen. Annu. Rev. Earth Planet. Sci. 22:1994;319-351
56. Stern R.J. Crustal evolution in the East African Orogen; a neodymium isotopic perspective. J. Afr. Earth Sci. 34:2002;109-117
57. Stern R.J., Hedge C.E. Geochronologic and isotopic constraints on late Precambrian crustal evolution in the Eastern Desert of Egypt. Am. J. Sci. 285:1985;97-127
58. Tefera, M., Berhe, S.M., 1987. Geology of Sheet NC 36-16 (Gore Sheet). Ethiopian Institute of Geological Surveys. Unpublished manuscript.
59. Teklay, M., 1986. Petrology and Geochemistry of Supracrustal and Intrusive Rocks from the Birbir Domain of the Gore-Gambella Geotraverse. Unpublished M.Sc. Thesis. Addis Ababa University, 102 pp.
60. Vail J.R. Pan-African crustal accretion in north-east Africa. J. Afr. Earth Sci. 1:1983;285-294
61. Vail J.R. Relationship between tectonic terrains and favourable metallogenic domains in the Central Arabian-Nubian Shield. Institute of Mining and Metallurgy Transactions, Section B. Appl. Earth Sci. 94:1985;1-6
62. Warden A.J., Kazmin V., Kiesel W., Phol W. Some geochemical data of mafic ultramafic complex at Tulu-Dimtri, Ethiopia and their genetic significance. Sitzungsberichte der Österreichischen Akademie der Wissenschaften Mathematik-Naturwissenschaften. 191:1982;111-131
63. Yibas B., Reimold W.U., Anhaeusser C.R., Koeberl C. Geochemistry of the mafic rocks of the ophiolitic fold and thrust belts of southern Ethiopia: constraints on the tectonic regime during the Neoproterozoic (900-700 Ma). Precambrian Res. 121:2003;157-183
64. Wolde, B., Gore-Gambella Geotraverse Team 1996. Tonalite-trondhjemite- granite gneisses by partial melting of newly underplated basaltic crust: and example from the Neoproterozoic Birbir magmatic arc, western Ethiopia. Precambrian Res. 76, 3-14.