Steep structure
A steep structure is a unique structural feature found in the O'okiep Copper District (OCD), Namaqualand, Northern Cape Province, South Africa. These structures occur as narrow, east-west trending, antiformal and/or monoclinal zones of high strain characterised by the rotation of regional foliation into subvertical attitude.[2] [3] These structures commonly host plug- and dyke-like mafic- to intermediate cupriferous bodies of the Koperberg Suite in their central portions.[4] Steep structures are interpreted to have formed at the same time as the granulite-facies metamorphism during the waning stages of the Namaqua Orogeny.[2] [5] Steep structures are also intimately related to megabreccias, a term coined by geologists in the OCD for granite-gneiss and metasedimentary country rocks cemented by granitic material [6]
References
[edit ]- ^ Geology Explainer (23 August 2020). "Geology Facts - steep structures".
- ^ a b Kisters, Alexander F. M.; Guy Charlesworth, E.; Gibson, Roger L.; Anhaeusser, Carl R. (1996年06月01日). "Steep structure formation in the Okiep Copper District, South Africa: bulk inhomogeneous shortening of a high-grade metamorphic granite-gneiss sequence" . Journal of Structural Geology. 18 (6): 735–751. Bibcode:1996JSG....18..735K. doi:10.1016/S0191-8141(96)80008-3. ISSN 0191-8141.
- ^ Watkeys, M. K. (1996年06月01日). "The Klondike steep structure, Okiep Copper District, South Africa". South African Journal of Geology. 99 (2): 169–183. ISSN 1012-0750.
- ^ Clifford, Tom N.; Barton, Erika S. (2012年12月01日). "The O'okiep Copper District, Namaqualand, South Africa: a review of the geology with emphasis on the petrogenesis of the cupriferous Koperberg Suite". Mineralium Deposita. 47 (8): 837–857. Bibcode:2012MinDe..47..837C. doi:10.1007/s00126-012-0403-x. ISSN 1432-1866. S2CID 129735687.
- ^ Gibson, R. L.; Robb, L. J.; Kisters, A. F. M.; Cawthorn, R. G. (1996年06月01日). "Regional setting and geological evolution of the Okiep Copper District, Namaqualand, South Africa". South African Journal of Geology. 99 (2): 107–120. ISSN 1012-0750.
- ^ Kisters, Alexander F. M.; Gibson, Roger L.; Charlesworth, E. Guy; Anhaeusser, Carl R. (1998年02月01日). "The role of strain localization in the segregation and ascent of anatectic melts, Namaqualand, South Africa" . Journal of Structural Geology. Structures and Properties of High Strain Zones in Rocks. 20 (2): 229–242. Bibcode:1998JSG....20..229K. doi:10.1016/S0191-8141(97)00081-3. ISSN 0191-8141.
