Zones of high strain characterised by the rotation of regional foliation into subvertical attitude
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
metasedimentarycountry rocks cemented by granitic material [6]
^Clifford, Tom N.; Barton, Erika S. (2012-12-01). "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.
ISSN1432-1866.
S2CID129735687.