Zobrazeno 1 - 10
of 14
pro vyhledávání: '"Tom N. Clifford"'
Autor:
Erika S. Barton, Tom N. Clifford
Publikováno v:
Mineralium Deposita. 47:837-857
The O’okiep Copper District is the oldest formal mining area in South Africa. Between 1852 and 2002, the 2,500 km2 area yielded two million tons of copper from 32 mines ranging in ore tonnages from 140,000 to 37 million tons. This paper summarizes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b37e34754e2f8fad996c00e24632b2ad
https://doi.org/10.1007/s00126-012-0403-x
https://doi.org/10.1007/s00126-012-0403-x
Autor:
Tom N. Clifford
Publikováno v:
South African Journal of Geology. 111:117-140
The Neoproterozoic succession in the Outjo District of northern Namibia is a mainly sedimentary sequence that was deposited in the time-interval of approximately 800 to 600 Ma ago and was deformed and suffered mild greenschist facies regional metamor
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5b85ff5d4eb7bb138777c3c9e9cd899c
https://doi.org/10.2113/gssajg.111.1.117
https://doi.org/10.2113/gssajg.111.1.117
Autor:
Tom N. Clifford, Jacqueline Vander Auwera, Erika S. Barton, Jean-Paul Liégeois, Jean-Clair Duchesne
Publikováno v:
Precambrian Research. 153:116-142
The Namaquan (Grenville) Orogeny (late Mesoproterozoic) in the O’okiep District is characterized by two tectono-magmatic episodes: the O’okiepian Episode (1210–1180 Ma) with the intrusion of batholitic granites, and the Klondikean Episode (1040
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::953c00935af503bafe9a38c06dcc1e42
https://doi.org/10.1016/j.precamres.2006.11.005
https://doi.org/10.1016/j.precamres.2006.11.005
Publikováno v:
Journal of Petrology. 45:669-691
s, XVI Geokongres, Geological Society of South Africa, Stellenbosch, pp. 160---163. Van Zyl, D. (1978). A petrological approach towards the ore-bearing potentialities of the Okiep basic intrusives in Namaqualand. In: Verwoed, W. J. (ed.) Mineralizati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5ec12ed7da777238e9a45b0e32c524bd
https://doi.org/10.1093/petrology/egg097
https://doi.org/10.1093/petrology/egg097
Publikováno v:
Journal of Petrology. 36:231-258
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2752a4adfe1460063a92084135d535f3
https://doi.org/10.1093/petrology/36.1.231
https://doi.org/10.1093/petrology/36.1.231
Publikováno v:
Mineralium Deposita. 11:46-70
The copper deposits of the O'okiep District rank amongst the top three S. African producers, with an annual output of 3 million metric tons grading 1.65% Cu on average. They occur in what is now considered the S. extension of the 1200 m. y. Kibaran o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7de965ddcae478cc319edad5f223ad4d
https://doi.org/10.1007/bf00203094
https://doi.org/10.1007/bf00203094
Publikováno v:
Precambrian Research. 3:415-431
U-Pb isotopic data are presented for composite and size fractions of zircons from 15 samples of the Franzfontein granitic suite. These data reveal two distinctly different discordance trends that yield concordia intercept ages of 1730±30 m.y. and 18
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d8d772042269157e8a2ac23a440e3286
https://doi.org/10.1016/0301-9268(76)90036-x
https://doi.org/10.1016/0301-9268(76)90036-x
Publikováno v:
Journal of Petrology. 16:154-188
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81ea1431be33a5de8d22d23879c65ad0
https://doi.org/10.1093/petrology/16.1.154
https://doi.org/10.1093/petrology/16.1.154
Publikováno v:
Contributions to Mineralogy and Petrology. 77:225-250
The northwestern part of South Africa and southern South-West Africa/Namibia is amongst the most extensive granulite terranes in Africa. This work reports the results of electron microprobe studies of minerals from two-pyroxene, cordieriteorthopyroxe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7b15b2a64bd4f9d6dc240b81024c0f49
https://doi.org/10.1007/bf00373538
https://doi.org/10.1007/bf00373538
Autor:
Tom N. Clifford
Publikováno v:
Earth and Planetary Science Letters. 1:421-434
When the major mineral deposits of Africa are studied in relation to the structure of the continent, two tectono-metallogenic units emerge, as follows: (a)younger orogens consisting of zones which have suffered orogenesis from time to time during the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ca9d7d7eba4c44907dbb079b2bc566a
https://doi.org/10.1016/0012-821x(66)90039-2
https://doi.org/10.1016/0012-821x(66)90039-2