Fabric evolution across a discontinuity between lower and upper crustal domains from field, microscopic, and anisotropy of magnetic susceptibility studies in central eastern Eritrea, NE Africa

Tectonics

Volumn 26, Issue 3, 2007, Pages

  Ghebreab, W ^a   Kontny, A ^b   Greiling, R O ^b  

^a UNIVERSITY OF ASMARA   (Eritrea)

^b UNIVERSITY OF HEIDELBERG   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

DISCONTINUITY; FOLIATION; LOWER CRUST; MAGNETIC ANISOTROPY; MAGNETIC FABRIC; MAGNETIC FIELD; MICROSTRUCTURE; PROTEROZOIC; SHEAR ZONE; TECTONIC SETTING; UPPER CRUST;

AFRICA; EAST AFRICA; ERITREA; SUB-SAHARAN AFRICA;

EID: 34548321017     PISSN: 02787407     EISSN: None     Source Type: Journal    
DOI: 10.1029/2005TC001881     Document Type: Article

References (52)

1. Andersson, U.-B., W. Ghebreab, and M. Teklay (2006), Crustal evolution and metamorphism in east central Eritrea, southeast Arabian-Nubian Shield, J. Afr. Earth Sci., 44, 450-65.
2. Aranguren, A., J. Cuevas, and J. M. Tubia (1996), Composite magnetic fabrics from S-C mylonites, J. Struct. Geol., 18, 863-869.
3. Aubourg, C., R. Hebert, L. Jolivet, and G. Cartayrade (2000), The magnetic fabric of metasediments in a detachment shear zone: The example of Tinos Island (Greece), Tectonophysics, 321, 219-236.
4. Beyth, M., R. Stern, and A. Mathews (1997), Significance of high grade metasediments from the Neoproterozoic of Eritrea, Precambrian Res., 86, 45-58.
5. Beyth, M., D. Avigad, H.-U. Wetzel, A. Matthews, and S. M. Berhe (2003), Crustal exhumation and indications for Snowball Earth in the East African Orogen: North Ethiopia and east Eritrea, Precambrian Res., 123, 187-201.
6. Blasband, B., S. White, P. Brooijmans, H. De Brooder, and W. Visser (2000), Late Proterozoic extensional collapse in the Arabian-Nubian Shield, J. Geol. Soc., London, 157, 615-628.
7. Borradaile, G. J. (1987), Anisotropy of magnetic susceptibility: Rock composition versus strain, Tectonophysics, 138, 327-329.
8. Borradaile, G. J. (1988), Magnetic susceptibility, petrofabrics and strain, Tectonophysics, 156, 1-20.
9. Borradaile, G. J., and J. F. Dehls (1993), Regional kinematics inferred from magnetic subfabrics in Archaean rocks of northern Ontario, Canada, J. Struct. Geol., 15, 887-894.
10. Borradaile, G. J., and D. Gauthier (2001), AMS-detection of inverse fabrics without AARM in ophiolite dikes, Geophys. Res. Lett., 28, 3517-3520.
11. Borradaile, G. J., and B. Henry (1997), Tectonic applications of the magnetic susceptibility and its anisotropy, Earth Sci. Rev., 42, 49-93.
12. Borradaile, G. J., and M. Jackson (2004), Anisotropy of magnetic susceptibility (AMS): magnetic petrofabrics of deformed rocks, in Magnetic Fabric: Methods and Applications, edited by F. Martin-Hernandez, C. Aubourg, and M. Jackson, Geol. Soc. Spec. Publ., 238, 299-360.
13. Bucher, K., and M. Frey (1994), Petrogenesis of Metamorphic Rocks, 318 pp., Springer, New York.
14. Burke, K.. and C. Sengör (1986), Tectonic escape in the evolution of the continental crust, in Reflection Seismology: The Continental Crust, Geodyn. Ser., vol. 14, edited by M. Barazangi and L. Brown, pp. 41-53, AGU, Washington, D. C.
15. Dewey, J. F. (1988), Extensional collapse of orogens, Tectonics, 7, 1123-1139.
16. Drury, S. A., and S. M. Berhe (1993), Accretion tectonics in northern Eritrea revealed by remotely sensed imagery, Geol. Mag., 130, 177-190.
17. Drury, S. A., and C. R. DeSouza Filho (1998), Neoproterozoic terrane assemblages in Eritrea: Review and prospects, J. Afr. Earth Sci., 27, 331-348.
18. Drury, S. A., S. P. Kelley, S. M. Berhe, R. E. Collier, and M. Abraha (1994), Structures related to Red Sea evolution in northern Eritrea, Tectonics, 13, 1371-1380.
19. Fritz, H., E. Wallbrecher, A. A. Kudeir, F. Abu El Ela, and R. D. Dallmeyer (1996), Formation of Neoproterozoic metamorphic core complexes during oblique convergence, Eastern Desert, Egypt, J. Afr. Earth Sci., 23, 311-327.
20. Gass, J. G. (1981), Pan-African (Upper Proterozoic) plate tectonic of the Arabian-Nubian Shield, in Pre-cambrian Plate Tectonics, Dev. Precambrian Geol., vol. 4, edited by A. Kröner, pp. 387-403, Elsevier, New York.
21. Ghebreab, W. (1999), Tectono-metamorphic history of Neoproterozoic rocks in eastern Eritrea, Precambrian Res., 98, 83-105.
22. Ghebreab, W., and C. J. Talbot (2000), Red Sea extension influenced by Pan-African tectonic grain in eastern Ertirea, J. Struct. Geol., 22, 931-946.
23. 39 cooling ages of low-angle mylonites in Eritrea, Precambrian Res., 139, 20-41.
24. Grégoire, V., J. Darrozes, P. Gaillot, and A. Nedelec (1998), Magnetic grain fabric and distribution anisotropy vs. rock magnetic fabric: A three dimensional case study, J. Struct. Geol., 20, 937-944.
25. Greiling, R. O. (1997), Thrust tectonics in crystalline domains: The origin of a gneiss dome, Proc. Indian Acad. Sci., 100, 209-220.
26. Greiling, R. O., M. M. Abdeen, A. A. Dardir, H. El Akhal, M. F. El Ramly, G. M. Kamal El Din, A. A. Osman, A. A. Rashwan, A. H. N. Rice, and M. F. Sadek (1994), A structural synthesis of the Proterozoic Arabian-Nubian Shield in Egypt, Geol. Rundsch., 83, 484-501.
27. Henry, B. (1997), The magnetic zone axis: A new element of magnetic fabric for the interpretation of the magnetic lineation, Tectonophysics, 271, 325-331.
28. Housen, B. A., B. A. Van Der Pluijm, and E. J. Essene (1995), Plastic behaviour of magnetite and high strain obtained from magnetic grains in the Parry Sound shear zone, Ontario, Greenville Province, J. Struct. Geol., 17, 265-278.
29. Hrouda, F. (1982), Magnetic anisotropy of rocks and its application in geology and geophysics, Geophys. Surv., 5, 37-82.
30. Hrouda, F. (1994), A technique for the measurement of thermal changes of magnetic susceptibility of weakly magnetic rocks by the CS-2 apparatus and KLY-2 Kappabridge, Geophys. J. Int., 118, 604-612.
31. Hrouda, F., and J. Jézek (1999), Theoretical models for the relationship between magnetic anisotropy and strain: Effect of triaxial magnetic grains, Tectonophysics, 301, 183-190.
32. Hrouda, F., and S. Khan (1991), The magnetic fabric relationship between sedimentary and basement nappes in the High Tatra Mountains, N. Slovakia, J. Struct. Geol., 13, 431-442.
33. Hrouda, F., V. Jelinek, and L. Hruskova (1990), A package of programs for statistical evaluation of magnetic data using IBM-PC computers, Eos Trans. AGU, 71(43), 1289.
34. Jelinek, V. (1981), Characterization of the magnetic fabric ofrocks, Tectonophysics, 79, T63-T67.
35. Johnson, P. R., and B. Woldehaimanot (2003), Development of the Arabian-Nubian Shield: Perspectives on the accretion and deformation in the northern East African Orogen and the assembly of Gondwana, in Proterozoic East Gondwana: Supercontinent Assembly and Breakup, edited by M. Yoshida, B. F. Windley, and S. Dasgupta, Geol. Soc Spec. Publ., 206, 289-325.
36. Just, J., A. Kontny, H. de Wall, A. M. Hirt. and F. Martin-Hernández (2004), Development of magnetic fabrics during hydrothermal alteration in the Soultz-sous-Forets granite from the EPS-1 drilling, Upper Rhine Graben, in Magnetic Fabric - Methods and Applications, edited by F. Martín-Hernández et al., Geol. Soc. Spec. Publ., 238, 509-526.
37. Khan, M. A. (1962), The anisotropy of magnetic susceptibility of some igneous and Metamorphic rocks, J. Geophys. Res., 67, 2873-2885.
38. Kontay, A., and H. de Wall (2000), Case studies on the use of temperature-dependent susceptibility for the characteristic of magneto-mineralogical changes during metamorphism, Phys. Chem. Earth, Part A, 25, 421-429.
39. Kröner, A., and F. P. Sacci (1996), Evolution of the northern Somali basement: New constraints from zircon ages, J. Aft. Earth Sci., 22, 1-15.
40. Noltimier, H. C. (1971), Magnetic rock cylinders with negligible shape anisotropy, J. Geophys. Res., 76, 4035-4037.
41. O'Reilly, W. (1984), Rock and Mineral Magnetism, 220 pp., Elsevier,,New York.
42. Pereira, M. F., and J. B. Silva (2004), Development of local orthorhombic fabrics within a simpic-shear dominated sinistral transpression zone: The Arronche sheared gneisses (Iberian Massif, Portugal), in Flow Processes in Faults and Shear Zones, edited by G. I. Alsop et al., Geol. Soc. Spec. Publ., 224, 215-227.
43. Rochette, B., M. Jackson, and C. Aubourg (1992), Rock magnetism and the interpretation of anisotropy of magnetic susceptibility, Rev. Geophys., 30, 209-226.
44. Rogers, J. W., J. S. Miller, and S. A. Climents (1995), A Pan-African zone linking East and West Gondwana, Mem. Geol. Soc. India, 34, 11-23.
45. Schandelmeier, H., and P.-O. Reynolds (1997), Late Neoproterozoic (Vendian ∼570 Ma), in Paleogeographic-Paleotectonic Atlas of North-eastern Africa, Arabia and Adjacent Areas, edited by H. Schandelmeier and P.-O. Reynolds, pp. 5-13, Balkema, A. A., Brookfield, Vt.
46. Sidman, D., E. C. Ferré, C. Teyssier, and M. Jackson (2005), Magnetic fabric and microstructure of a mylonite: Example from the Bitterroot Shear Zone, western Montana, in High-Strain Zones: Structure and Physical Properties, edited by D. Bruhn and L. Burlini, Geol. Soc. Spec. Publ., 245, 143-163.
47. Stem, R. J. (1994), Arc assembly and continental collision in the Neoproterozoic East African Orogen: Implications for the consolidation of Gondwana-land, Annu. Rev. Earth Planer. Sci., 22, 319-351.
48. Talbot C. J., and W. Ghebreab (1997), Red Sea detachment and basement core complexes in Eritrea, Geology, 25, 568-655.
49. Tarling, D. H., and F. Hrouda (1993), The Magnetic Anisotropy of Rocks, 217 pp., CRC Press, Boca Raton, Fla.
50. Teklay, M., K. Berhe, U. Reinold, R. Armstrong, Y. Asmerom, and J. Watson (2002), Geochemistry and geochronology of Neoproterozoic low-K tholeiite-boninite association in central Eritrea, Gondwana Res., 5, 597-611.
51. Vail, R. J. (1985), Pan-African (Late Precambrian) tectonic terranes and the reconstruction of the Arabian-Nubian Shield, Geology, 13, 839-842.
52. Windley, P. F., M. J. Whitehouse, and M. A. O. Ba-Bttat (1996), Early Precambrian gneiss terranes and Pan-African island arcs in Yemen: Crustal accretion of the eastern Arabian Shield, Geology, 24, 131-134.