Zobrazeno 1 - 10
of 22
pro vyhledávání: '"S. A. de Waal"'
Autor:
S. A. de Waal
Publikováno v:
South African Journal of Geology. 115:345-368
Burnt Mountain is the name attached to a series of low, dark-coloured hills, dominantly composed of carbonaceous shale, siltstone, sandstone and various ferruginous rocks belonging to the Permian Verbrande Berg Formation, Ecca Group, Karoo Supergroup
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6b0439301798e93c3a04bf3d7a151d7
https://doi.org/10.2113/gssajg.115.3.345
https://doi.org/10.2113/gssajg.115.3.345
Publikováno v:
Journal of African Earth Sciences. 50:111-119
The combination of ion microprobe dating and cathodoluminescence (CL) imaging of zircons from a high-grade rock from the Central Zone of the Limpopo Belt were used to constrain the age of metamorphic events in the area. Zircon grains extracted from a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::344ddf918005065e3a0925312426027f
https://doi.org/10.1016/j.jafrearsci.2007.09.011
https://doi.org/10.1016/j.jafrearsci.2007.09.011
Publikováno v:
South African Journal of Geology. 109:279-300
The Lindeques Drift and Heidelberg Intrusions and the volcanic Roodekraal Complex belong to a high-Ti mafic igneous suite (HITIS) that was emplaced in the Kaapvaal Craton as km-sized bodies, to the north and north-east of the Vredefort impact structu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ece4ac7df7b045ee100b0d8173a5c06
https://doi.org/10.2113/gssajg.109.3.279
https://doi.org/10.2113/gssajg.109.3.279
Publikováno v:
Journal of African Earth Sciences. 43:537-548
The Schurwedraai alkali granite is one of a number of prominent ultramafic-mafic and felsic intrusions in the Neoarchaean to Palaeoproterozoic sub-vertical supracrustal collar rocks of the Vredefort Dome, South Africa. The alkali granite intruded the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::268557609a8c62b3d102f957c7dd20f9
https://doi.org/10.1016/j.jafrearsci.2005.09.009
https://doi.org/10.1016/j.jafrearsci.2005.09.009
Publikováno v:
Mineralogical Magazine. 67:1015-1021
We report in this paper the first occurrence of the rare assemblage corundum + quartz in the high-grade metamorphic zone in the core of the Namaqualand Metamorphic Complex (NMC) (South Africa). The magnetite-bearing rocks hosting the corundum-quartz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4321c28ce8a14481a0a4fbe9557fd3d1
https://doi.org/10.1180/0026461036750140
https://doi.org/10.1180/0026461036750140
Publikováno v:
South African Journal of Geology. 104:343-354
Mafic-ultramafic sills of up to 450m in thickness occur near the contact between sedimentary and volcanic rocks of the Silverton Formation, Transvaal Supergroup, on the farms Blaauwboschkraal, Zwartkopje and Waterval, some 10km north of Waterval Bove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::deaaed5d3e0211e814b98a5642cb8fc2
https://doi.org/10.2113/gssajg.104.4.343
https://doi.org/10.2113/gssajg.104.4.343
Publikováno v:
South African Journal of Geology. 104:309-318
Both Ni-Cu and PGE deposits are associated with mafic and ultramafic rocks, but the former often occur in dynamic magmatic systems such as lava channels and magma conduits whereas the later occur in larger layered intrusions. The contrasting modes of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f032007a516b530f622f338ad07beb9e
https://doi.org/10.2113/gssajg.104.4.309
https://doi.org/10.2113/gssajg.104.4.309
Autor:
Pavel Pitra, S. A. de Waal
Publikováno v:
Journal of Metamorphic Geology. 19:311-325
Metapelitic rocks from the Marble Hall Fragment, enclosed in the granites of the magmatic Bushveld Complex, record a two-stage, low-pressure, high-temperature metamorphism. An early paragenesis containing chiastolitic andalusite, cordierite, biotite
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e0e67b6d8b0aa223af06ed87d641a582
https://doi.org/10.1046/j.1525-1314.2001.00313.x
https://doi.org/10.1046/j.1525-1314.2001.00313.x
Publikováno v:
The Canadian Mineralogist. 39:547-556
Large, layered intrusions throughout the world are characterized by a remarkable paucity in economically important magmatic Ni–Cu sulfide deposits. The Sudbury intrusion in Canada is a notable exception, but sulfide ores there were formed by a uniq
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f13a69b6bec33ba08bd7b9903250bb1d
https://doi.org/10.2113/gscanmin.39.2.547
https://doi.org/10.2113/gscanmin.39.2.547
Publikováno v:
The Canadian Mineralogist. 39:557-571
The Uitkomst Complex, a Ni–Cu–PGE–Cr-mineralized layered basic intrusion situated approximately 200 km due east of Pretoria, South Africa, hosts commercially viable magmatic base-metal sulfide deposits. The Complex has a concordant 207Pb/206Pb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e43bff09d8267b2cec52682abc8dc2ee
https://doi.org/10.2113/gscanmin.39.2.557
https://doi.org/10.2113/gscanmin.39.2.557