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Journal articles on the topic 'Magmatism – South Africa'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

MIZUSAKI, ANA MARIA PIMENTEL, ANTONIO THOMAZ FILHO, and PEDRO DE CESERO. "Ages of the Magmatism and the Opening of the South Atlantic Ocean." Pesquisas em Geociências 25, no. 2 (1998): 47. http://dx.doi.org/10.22456/1807-9806.21166.

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The analysis of published and unpublished 368 K/Ar radiometric ages of basic, intermediate and alkaline volcanic rocks, related to the post-Paleozoic magmatism linked to the opening of the South Atlantic Ocean, yields some important evidence concerning the break up of the Gondwana supercontinent. At the Brazilian Equatorial margin, the Gondwana break up started in the Permo-Triassic, when the opening of the Equatorial South Atlantic Ocean began and spread out south-eastward up to the present day Amazon River mouth. During the middle Jurassic/lower Cretaceous (pre-Aptian), the continuity of thi

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2

Thomas, R. J., B. M. Eglington, and S. A. Bowring. "Dating the cessation of Kibaran magmatism in Natal, South Africa." Journal of African Earth Sciences (and the Middle East) 16, no. 3 (1993): 247–52. http://dx.doi.org/10.1016/0899-5362(93)90046-s.

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3

Ashwal, Lewis D., Madelein Patzelt, Mark D. Schmitz, and Kevin Burke. "Isotopic evidence for a lithospheric origin of alkaline rocks and carbonatites: an example from southern Africa." Canadian Journal of Earth Sciences 53, no. 11 (2016): 1216–26. http://dx.doi.org/10.1139/cjes-2015-0145.

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Alkaline rocks and carbonatites, including nepheline syenites, are well established as mantle-derived magmatic products, but the nature and location of their mantle sources is debated. Some workers have used isotopic compositions to infer mixed mantle plume type sources such as EM1, HIMU, and FOZO, implying derivation from the subcontinental asthenosphere. Other models favour an entirely lithospheric source, whereby the magmas, originally formed during intracontinental rifting, became deformed and subducted into the mantle lithosphere during later continental collisions, and constituted part o

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4

Melankholina, E. N., and N. M. Sushchevskaya. "Tectonics of the Southern Ocean passive margins in the Africa – East Antarctica region." Геотектоника, no. 4 (August 13, 2019): 25–42. http://dx.doi.org/10.31857/s0016-853x2019325-42.

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Based on geological and geophysical data for the conjugate margins of Africa – East Antarctica, the peculiarities of preparation of the breakup central Gondwana supercontinent are discussed. When using the historical approach, a significant inheritance of the Middle-Upper Jurassic tectono-magmatic development from the preceding time is shown. The first location of tectono-magmatic activity in zones of weakness on the proximal margin, its subsequent migration to distal margins and further oceanic opening is established. The geochemical features of magmas of the region and their sources are unde

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5

Milner, Simon C., Anton P. Le Roex, and Ronald T. Watkins. "Rb-Sr age determinations of rocks from the Okenyenya igneous complex, northwestern Namibia." Geological Magazine 130, no. 3 (1993): 335–43. http://dx.doi.org/10.1017/s001675680002001x.

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AbstractThe Okenyenya igneous complex is one of a suite of intrusions which define a prominent northeast-trending linear feature in Damaraland, northwestern Namibia. Precise Rb–Sr internal isochron ages range from 128.6 ± 1 to 123.4 ± 1.4 Ma for the major phases of intrusion identified within the complex. The tholeiitic gabbros forming the outer rings of the complex, and the later alkali gabbros which form the central hills, cannot be distinguished in terms of Rb–Sr ages, although field relations clearly indicate the younger age of the latter. The intrusionsof nepheline-syenite and essexite co

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6

THOMAZ FILHO, ANTONIO, ANA MARIA PIMENTEL MIZUSAKI, EDISON JOSE MILANI, and PEDRO DE CESERO. "RIFTING AND MAGMATISM ASSOCIATED WITH THE SOUTH AMERICA AND AFRICA BREAK UP." Revista Brasileira de Geociências 30, no. 1 (2000): 017–19. http://dx.doi.org/10.25249/0375-7536.2000301017019.

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7

Cook, Y. A. "Precambrian rift-related magmatism and sedimentation, south Victoria Land, Antarctica." Antarctic Science 19, no. 4 (2007): 471–84. http://dx.doi.org/10.1017/s0954102007000612.

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AbstractPrecambrian continental extension is described in detail for the first time in the Victoria Land segment of the Transantarctic Mountains and is comparable with plume related intercontinental rifting of the Afar area, Africa. The Baronick Formation comprises igneous-derived conglomerate, marble and volcanic to sub-volcanic igneous layers. Volcanic and carbonate horizons were eroded in a fluvial or marine environment and provided debris for mass flow and slump deposits which formed in a marginal marine basin in the Precambrian. Clasts in these deposits include basalt, trachyte and comend

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8

Harmer, R. E. "The Petrogenetic Association of Carbonatite and Alkaline Magmatism: Constraints from the Spitskop Complex, South Africa." Journal of Petrology 40, no. 4 (1999): 525–48. http://dx.doi.org/10.1093/petroj/40.4.525.

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9

Cuney, Michel. "Felsic magmatism and uranium deposits." Bulletin de la Société Géologique de France 185, no. 2 (2014): 75–92. http://dx.doi.org/10.2113/gssgfbull.185.2.75.

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Abstract The strongly incompatible behaviour of uranium in silicate magmas results in its concentration in the most felsic melts and a prevalence of granites and rhyolites as primary U sources for the formation of U deposits. Despite its incompatible behavior, U deposits resulting directly from magmatic processes are quite rare. In most deposits, U is mobilized by hydrothermal fluids or ground water well after the emplacement of the igneous rocks. Of the broad range of granite types, only a few have U contents and physico-chemical properties that permit the crystallization of accessory mineral

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10

Riley, Teal R., and Kim B. Knight. "Age of Pre-Break-Up Gondwana Magmatism." Antarctic Science 13, no. 2 (2001): 99–110. http://dx.doi.org/10.1017/s0954102001000177.

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Extensive outpourings of basalt, and to a lesser extent rhyolite, are closely associated with continental break-up and plume–lithosphere interactions. The Gondwana supercontinent began to fragment during Early–Middle Jurassic times and was associated with the eruption of over three million km3 of dominantly basaltic magma. This intense magmatic episode is recorded in volcanic rocks of the Karoo (Africa), Ferrar (Antarctica) and Chon Aike (South America). K–Ar and Rb–Sr whole rock geochronology has consistently failed to produce reliable ages for these volcanic rocks, but in the last four years

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11

Prevec, Stephen A. "Igneous Rock Associations 23. The Bushveld Complex, South Africa: New Insights and Paradigms." Geoscience Canada 45, no. 3-4 (2019): 117–35. http://dx.doi.org/10.12789/geocanj.2018.45.138.

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SUMMARYThe Bushveld Complex has continued to serve as the basis for study into the fundamental nature of petrological processes for layered intrusion formation and for oxide and sulphide hosted Platinum Group Element (PGE)–Cu–Ni ore deposits. These studies have included discoveries in terms of the physical extent of Bushveld magmatism, both laterally and internally. Lateral variations in the mafic to ultramafic Rustenburg Layered Suite of the Northern Lobe of the complex have also revealed petrologically distinctive Upper Critical Zone equivalent rocks (the so-called Flatreef) with enhanced co

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12

Poujol, M., J. Jaguin, J.-F. Moyen, P. Boulvais, and J.-L. Paquette. "Archaean S-Type granites: petrology, geochemistry and geochronology of the Lekkersmaak and Willie plutons, Kaapvaal Craton, South Africa." South African Journal of Geology 124, no. 1 (2021): 87–110. http://dx.doi.org/10.25131/sajg.124.0004.

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Abstract S-type granites correspond to reworking of pre-existing continental material and form by partial melting of (meta)sediments. Early-to-mid Archaean S-type granites are rare and are more frequently found, usually as relatively small intrusions, during the Neoarchaean and the Archaean-Proterozoic transition. In the context of Archaean geology, their paucity is therefore significant, in that it matches the uncommon nature of processes during this period. In this study, we focus on the Late Mesoarchaean Willie pluton and Neoarchaean Lekkersmaak pluton, which crop out to the south of the Mu

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13

Giuliani, Andrea, David Phillips, Roland Maas, et al. "LIMA U–Pb ages link lithospheric mantle metasomatism to Karoo magmatism beneath the Kimberley region, South Africa." Earth and Planetary Science Letters 401 (September 2014): 132–47. http://dx.doi.org/10.1016/j.epsl.2014.05.044.

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14

Schorn, Simon, Johann F. A. Diener, Dominik Sorger, and Chris Clark. "The contribution of charnockite magmatism to achieve near-ultrahigh temperatures in the Namaqua–Natal Metamorphic Province, South Africa." Lithos 368-369 (September 2020): 105585. http://dx.doi.org/10.1016/j.lithos.2020.105585.

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15

JAECKEL, P., A. KRÖNER, S. L. KAMO, G. BRANDL, and J. I. WENDT. "Late Archaean to early Proterozoic granitoid magmatism and high-grade metamorphism in the central Limpopo belt, South Africa." Journal of the Geological Society 154, no. 1 (1997): 25–44. http://dx.doi.org/10.1144/gsjgs.154.1.0025.

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16

Agangi, Andrea, Axel Hofmann, Vadim S. Kamenetsky, and Pieter Z. Vroon. "Palaeoarchaean felsic magmatism: A melt inclusion study of 3.45Ga old rhyolites from the Barberton Greenstone Belt, South Africa." Chemical Geology 414 (October 2015): 69–83. http://dx.doi.org/10.1016/j.chemgeo.2015.09.002.

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17

Nielsen, Troels F. D., Martin Jebens, Sven M. Jensen, and Karsten Secher. "Archetypal kimberlite from the Maniitsoq region, southern West Greenland and analogy to South Africa." Geological Survey of Denmark and Greenland (GEUS) Bulletin 10 (November 29, 2006): 45–48. http://dx.doi.org/10.34194/geusb.v10.4906.

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Ultramafic dyke rocks with kimberlitic megacrysts and mantle nodules have been known for decades from the northern part of the Archaean block and adjacent Proterozoic terranes in southern West Greenland (Fig. 1; Escher & Watterson 1973; Goff 1973; Scott 1981; Larsen & Rex 1992; Mitchell et al. 1999). Some of the dykes have proved to be diamondiferous (see Jensen et al. 2004a, b, for exploration results, diamond contents, and references). The c. 600 Ma old dykes werecalled ‘kimberlitic’ by Larsen & Rex (1992), but Mitchell et al. (1999) concluded that they were best referred to a ‘c

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18

Stone, Philip. "Geology reviewed for the Falkland Islands and their offshore sedimentary basins, South Atlantic Ocean." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 106, no. 2 (2015): 115–43. http://dx.doi.org/10.1017/s1755691016000049.

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ABSTRACTThe position of the Falkland Islands adjacent to the South American continental margin belies the close association of their geology with that of South Africa. A Mesoproterozoic basement is unconformably overlain by a Silurian to Devonian succession of fluvial to neritic and shallow marine, siliciclastic strata. This is disconformably succeeded by a largely Permian succession that, near its base, includes a glacigenic diamictite and, thence, passes upwards into a succession of deltaic and lacustrine strata. The lithological succession and the character of its deformation bear striking

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19

Boone, Samuel C., Barry P. Kohn, Andrew J. W. Gleadow, Christopher K. Morley, Christian Seiler, and David A. Foster. "Birth of the East African Rift System: Nucleation of magmatism and strain in the Turkana Depression." Geology 47, no. 9 (2019): 886–90. http://dx.doi.org/10.1130/g46468.1.

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Abstract The Turkana Depression of northern Kenya and southern Ethiopia contains voluminous plume-related basalts that mark the onset of the Paleogene–recent East African Rift System (EARS) at ca. 45 Ma. Thus, the Turkana Depression is crucial to understanding the inception of intracontinental rifting. However, the precise chronology of early rift-basin formation in Turkana is poorly constrained. We present apatite fission-track and (U-Th-Sm)/He thermochronology data from basement rocks from the margins of the north-south–trending Lokichar Basin that constrain the onset of rift-related cooling

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20

Riley, Teal R., and Philip T. Leat. "Chapter 2.2a Palmer Land and Graham Land volcanic groups (Antarctic Peninsula): volcanology." Geological Society, London, Memoirs 55, no. 1 (2021): 121–38. http://dx.doi.org/10.1144/m55-2018-36.

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AbstractThe break-up of Gondwana during the Early–Middle Jurassic was associated with flood basalt volcanism in southern Africa and Antarctica (Karoo–Ferrar provinces), and formed one of the most extensive episodes of continental magmatism of the Phanerozoic. Contemporaneous felsic magmatism along the proto-Pacific margin of Gondwana has been referred to as a silicic large igneous province, and is exposed extensively in Patagonian South America, the Antarctic Peninsula and elsewhere in West Antarctica. Jurassic-age silicic volcanism in Patagonia is defined as the Chon Aike province and forms o

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21

Humbert, Fabien, Andrea Agangi, Malcolm Massuyeau, et al. "Rifting of the Kaapvaal Craton during the early Paleoproterozoic: Evidence from magmatism in the western Transvaal subbasin (South Africa)." Precambrian Research 342 (June 2020): 105687. http://dx.doi.org/10.1016/j.precamres.2020.105687.

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22

Drabon, Nadja, Benjamin L. Byerly, Gary R. Byerly, Joseph L. Wooden, C. Brenhin Keller, and Donald R. Lowe. "Heterogeneous Hadean crust with ambient mantle affinity recorded in detrital zircons of the Green Sandstone Bed, South Africa." Proceedings of the National Academy of Sciences 118, no. 8 (2021): e2004370118. http://dx.doi.org/10.1073/pnas.2004370118.

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The nature of Earth’s earliest crust and the processes by which it formed remain major issues in Precambrian geology. Due to the absence of a rock record older than ∼4.02 Ga, the only direct record of the Hadean is from rare detrital zircon and that largely from a single area: the Jack Hills and Mount Narryer region of Western Australia. Here, we report on the geochemistry of Hadean detrital zircons as old as 4.15 Ga from the newly discovered Green Sandstone Bed in the Barberton greenstone belt, South Africa. We demonstrate that the U-Nb-Sc-Yb systematics of the majority of these Hadean zircon

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23

Lana, Cristiano, Ian Buick, Gary Stevens, Riana Rossouw, and Willem De Wet. "3230–3200 Ma post-orogenic extension and mid-crustal magmatism along the southeastern margin of the Barberton Greenstone Belt, South Africa." Journal of Structural Geology 33, no. 5 (2011): 844–58. http://dx.doi.org/10.1016/j.jsg.2011.03.007.

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24

Trumbull, R. B., M. Sudo, C. Harris, R. A. Armstrong, and C. H. de Beer. "The age of the Koegel Fontein anorogenic complex, South Africa, and its relationship to the regional timing of magmatism and breakup along the South Atlantic rifted margin." South African Journal of Geology 122, no. 1 (2019): 69–78. http://dx.doi.org/10.25131/sajg.122.0007.

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25

Humbert, F., A. Hofmann, M. de Kock, A. Agangi, Y.-M. Chou, and P. W. Mambane. "A geochemical study of the Crown Formation and Bird Member lavas of the Mesoarchaean Witwatersrand Supergroup, South Africa." South African Journal of Geology 124, no. 3 (2021): 663–84. http://dx.doi.org/10.25131/sajg.124.0022.

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Abstract The ca. 2.97 to 2.80 Ga Witwatersrand Supergroup, South Africa, represents the oldest intracontinental sedimentary basin of the Kaapvaal craton. Two volcanic units occur in this supergroup: the widespread Crown Formation lavas in the marine shale-dominated West Rand Group and the more geographically restricted Bird Member lavas, intercalated with fluvial to fluvio-deltaic sandstone and conglomerate of the Central Rand Group. These units remain poorly studied as they are rarely exposed and generally deeply weathered when cropping out. We report whole-rock major and trace elements, Hf a

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Barton, J. M. "The geology of the area surrounding the Venetia kimberlite pipes, Limpopo Belt, South Africa: A complex interplay of nappe tectonics and granitoid magmatism." South African Journal of Geology 106, no. 2-3 (2003): 109–28. http://dx.doi.org/10.2113/106.2-3.109.

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27

Clemens, J. D., and G. Stevens. "S- to I- to A-type magmatic cycles in granitic terranes are not globally recurring progressions. The cases of the Cape Granite Suite of Southern Africa and central Victoria in southeastern Australia." South African Journal of Geology 124, no. 3 (2021): 565–74. http://dx.doi.org/10.25131/sajg.124.0007.

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Abstract Recurring progression from S- to I- to A-type granites has been proposed for a subset of granitic rocks in eastern Australia. The wider applicability and the validity of this idea is explored using the Cape Granite Suite (CGS) of South Africa and the granitic and silicic volcanic rocks of central Victoria, in southeastern Australia. Within the CGS there is presently little justification for the notion that there is a clear temporal progression from early S-type, through I-type to late A-type magmatism. The I- and S-type rocks are certainly spatially separated. However, apart from a si

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Moyen, J.-F., M. Cuney, D. Baratoux, P. Sardini, and S. Carrouée. "Multi-scale spatial distribution of K, Th and U in an Archaean potassic granite: a case study from the Heerenveen batholith, Barberton Granite-Greenstone Terrain, South Africa." South African Journal of Geology 124, no. 1 (2021): 53–86. http://dx.doi.org/10.25131/sajg.124.0005.

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Abstract We describe the multi-scale distribution of K, Th and U in the ca. 3.1 Ga Heerenveen batholith of the Barberton Granite-Greenstone Terrain. Data were obtained with a combination of tools, including a portable gamma-ray spectrometer from the scale of the whole batholith to the scale of outcrops, and autoradiography for the thin section scale. U is concentrated preferentially in minor phases in the border shear zones of the batholith and, within these shear zones, in late pegmatites as well as fractures. The processes responsible for the concentration of U in the Heerenveen batholith is

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29

Laurent, O., M. Rapopo, G. Stevens, et al. "Contrasting petrogenesis of Mg–K and Fe–K granitoids and implications for post-collisional magmatism: Case study from the Late-Archean Matok pluton (Pietersburg block, South Africa)." Lithos 196-197 (May 2014): 131–49. http://dx.doi.org/10.1016/j.lithos.2014.03.006.

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30

Graham, I. T., S. A. De Waal, and R. A. Armstrong. "New U–Pb SHRIMP zircon age for the Schurwedraai alkali granite: Implications for pre-impact development of the Vredefort Dome and extent of Bushveld magmatism, South Africa." Journal of African Earth Sciences 43, no. 5 (2005): 537–48. http://dx.doi.org/10.1016/j.jafrearsci.2005.09.009.

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31

Drabon, Nadja, Christoph E. Heubeck, and Donald R. Lowe. "Evolution of an Archean fan delta and its implications for the initiation of uplift and deformation in the Barberton greenstone belt, South Africa." Journal of Sedimentary Research 89, no. 9 (2019): 849–74. http://dx.doi.org/10.2110/jsr.2019.46.

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ABSTRACT The 3.28 to 3.23 Ga Mapepe Formation in the Barberton greenstone belt, South Africa, marks the initiation of widespread tectonic uplift and deformation after nearly 300 million years of predominantly basaltic and komatiitic magmatism under largely anorogenic conditions. This rapid transition is recorded in the eastern Barite Valley area by the buildup of a fan delta. Well-exposed sections there reach about 450 m thick and can be divided (from base to top) into five informal members: Member 1 is dominated by mudstone with subordinate banded ferruginous chert and turbiditic sandstone re

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32

D’Eyrames, Elisabeth, Emilie Thomassot, Yumi Kitayama, Alexander Golovin, Andrey Korsakov, and Dmitri Ionov. "A mantle origin for sulfates in the unusual “salty” Udachnaya-East kimberlite from sulfur abundances, speciation and their relationship with groundmass carbonates." Bulletin de la Société géologique de France 188, no. 1-2 (2017): 6. http://dx.doi.org/10.1051/bsgf/2017007.

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The Udachnaya-East pipe in Yakutia in Siberia hosts a unique dry (serpentine-free) body of hypabyssal kimberlite (<0.64wt% H2O), associated with a less dry type of kimberlite and a serpentinized kimberlitic breccia. The dry kimberlite is anomalously rich in salts (Na2O and Cl both up to 6wt%) whereas the slightly less dry and the breccia kimberlite are salt free. Yet the Udachnaya kimberlite is a group-I kimberlite, as is the archetypical kimberlite from Kimberley, South Africa. Samples were studied from the three different types of kimberlite (dry-salty, n=8, non-salty, n=5 and breccia, n=

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Kanouo, Nguo Sylvestre, David Richard Lentz, Khin Zaw, et al. "New Insights into Pre-to-Post Ediacaran Zircon Fingerprinting of the Mamfe PanAfrican Basement, SW Cameroon: A Possible Link with Rocks in SE Nigeria and the Borborema Province of NE Brazil." Minerals 11, no. 9 (2021): 943. http://dx.doi.org/10.3390/min11090943.

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The pre- to post-Late Neoproterozoic geological histories in the south to southwestern part of Mamfe Basin (SW Cameroon) were reported following analysis of the zircon crystals from their host rocks. A genetic model was developed for the zircon host rocks’ formation conditions, and the registered post-emplacement events were presented. The obtained ages were correlated with the data available for rocks in the Cameroon Mobile Belt, SE Nigeria, and the Borborema Province of NE Brazil. Separated zircons from Araru black to whitish gneiss, Araru whitish-grey gneiss, and Mboifong migmatite were ana

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Zahour, R., G. Zahour, Y. Zerhouni, S. Alikouss, Z. Baroudi, and H. El Hadi. "Hydrothermalism Associeted To Ediacarian Volcanism Of Ait Sawn And Tissouktai (Eastern Anti- Atlas, Morocco)." European Scientific Journal, ESJ 12, no. 24 (2016): 316. http://dx.doi.org/10.19044/esj.2016.v12n24p316.

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In the South East of Ouarzazate (south west of the Saghro massif, Anti Atlas) outcrop the geological formations of Ait Sawn and Tissouktai. These, attributed to the Ediacaran (or terminal Neoproterozoic), consist of basic volcanic facies, intermediate and acid intercalated with pyroclastics and epiclastic levels. This set is traversed locally by acidic veins. The rocks studied suffered intense weathering processes marked by the development of secondary minerals which are also formed in the hydrothermal veins and at the expense of the primary magmatic minerals and mesostasis. The main paragenes

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35

Klemd, Reiner, Andreas Beinlich, Matti Kern, et al. "Magmatic PGE Sulphide Mineralization in Clinopyroxenite from the Platreef, Bushveld Complex, South Africa." Minerals 10, no. 6 (2020): 570. http://dx.doi.org/10.3390/min10060570.

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The Platreef, at the base of the northern limb of the Bushveld Complex in South Africa, hosts platinum-group element (PGE) mineralization in association with base-metal sulphides (BMS) and platinum-group minerals (PGM). However, whilst a magmatic origin of the stratiform mineralization of the upper Platreef has been widely confirmed, the processes responsible for the PGE and BMS mineralization and metasomatism of the host rocks in the Platreef are still under discussion. In order to contribute to the present discussion, we present an integrated petrographical, mineral-chemical, whole-rock trac

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Buchanan, Paul C., Christian Koeberl, and Wolf Uwe Reimold. "Petrogenesis of the Dullstroom Formation, Bushveld Magmatic Province, South Africa." Contributions to Mineralogy and Petrology 137, no. 1-2 (1999): 133–46. http://dx.doi.org/10.1007/s004100050587.

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37

Siegesmund, S., S. Oriolo, B. Schulz, T. Heinrichs, M. A. S. Basei, and B. Lammerer. "The birth of the Alps: Ediacaran to Paleozoic accretionary processes and crustal growth along the northern Gondwana margin." International Journal of Earth Sciences 110, no. 4 (2021): 1321–48. http://dx.doi.org/10.1007/s00531-021-02019-7.

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AbstractNew whole-rock geochemical and coupled U–Pb and Lu–Hf LA-ICP-MS zircon data of metasedimentary rocks of the Austroalpine, South Alpine and Penninic basement domains are presented, to disentangle the pre-Variscan tectonic evolution of the proto-Alps. The studied units seem to record distinct stages of protracted Late Ediacaran to Carboniferous tectonosedimentary processes prior to the Variscan collision. In the case of Austroalpine and South Alpine units, nevertheless, no major differences in terms of provenance are observed, since most detrital zircon samples are characterized by a maj

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Rozendaal, A., and R. Scheepers. "Magmatic and related mineral deposits of the Pan-African Saldania belt in the Western Cape Province, South Africa." Journal of African Earth Sciences 21, no. 1 (1995): 107–26. http://dx.doi.org/10.1016/0899-5362(95)00083-6.

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Latypov, R., S. Chistyakova, and J. Kramers. "Arguments against syn-magmatic sills in the Bushveld Complex, South Africa." South African Journal of Geology 120, no. 4 (2017): 565–74. http://dx.doi.org/10.25131/gssajg.120.4.565.

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Kroonenberg, S. B., E. W. F. de Roever, L. M. Fraga, et al. "Paleoproterozoic evolution of the Guiana Shield in Suriname: A revised model." Netherlands Journal of Geosciences - Geologie en Mijnbouw 95, no. 4 (2016): 491–522. http://dx.doi.org/10.1017/njg.2016.10.

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AbstractThe Proterozoic basement of Suriname consists of a greenstone–tonalite–trondhjemite–granodiorite belt in the northeast of the country, two high-grade belts in the northwest and southwest, respectively, and a large granitoid–felsic volcanic terrain in the central part of the country, punctuated by numerous gabbroic intrusions. The basement is overlain by the subhorizontal Proterozoic Roraima sandstone formation and transected by two Proterozoic and one Jurassic dolerite dyke swarms. Late Proterozoic mylonitisation affected large parts of the basement. Almost 50 new U–Pb and Pb–Pb zircon

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Zaccarini, Federica, and Giorgio Garuti. "Zoned Laurite from the Merensky Reef, Bushveld Complex, South Africa: “Hydrothermal” in Origin?" Minerals 10, no. 4 (2020): 373. http://dx.doi.org/10.3390/min10040373.

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Laurite, ideally (Ru,Os)S2, is a common accessory mineral in podiform and stratiform chromitites and, to a lesser extent, it also occurs in placer deposits and is associated with Ni-Cu magmatic sulfides. In this paper, we report on the occurrence of zoned laurite found in the Merensky Reef of the Bushveld layered intrusion, South Africa. The zoned laurite forms relatively large crystals of up to more than 100 µm, and occurs in contact between serpentine and sulfides, such as pyrrhotite, chalcopyrite, and pentlandite, that contain small phases containing Pb and Cl. Some zoned crystals of laurit

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Ogilvie-Harris, R. C., M. Field, R. S. J. Sparks, and M. J. Walter. "Perovskite from the Dutoitspan kimberlite, Kimberley, South Africa: implications for magmatic processes." Mineralogical Magazine 73, no. 6 (2009): 915–28. http://dx.doi.org/10.1180/minmag.2009.073.6.915.

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AbstractPerovskite compositions are used to investigate the relationship between the minor components (i.e. LREE, Fe3+ and Nb) and the oxygen fugacity (fo2) of perovskite in four different kimberlite lithofacies from the Dutoitspan pipe, Kimberley, South Africa, which range from diamondiferous to barren. The perovskite textures and chemical variations provide insight into magmatic and eruptive processes. Some crystals display cores with rims separated by a sharp boundary. The cores contain larger Na and LREE contents relative to the rims, which show a large increase in Fe3+ and Al. The mid-gra

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Vonopartis, Leonidas, Paul Nex, Judith Kinnaird, and Laurence Robb. "Evaluating the Changes from Endogranitic Magmatic to Magmatic-Hydrothermal Mineralization: The Zaaiplaats Tin Granites, Bushveld Igneous Complex, South Africa." Minerals 10, no. 4 (2020): 379. http://dx.doi.org/10.3390/min10040379.

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The stanniferous granites of the Zaaiplaats Tin Field are part of the A-Type Lebowa Granite Suite, within the greater Bushveld Igneous Complex of northeast South Africa. The tin field comprises three granites: (1) the Nebo, a leucocratic, equigranular biotite granite; (2) The brick-red hypidiomorphic Bobbejaankop granite, which is extensively microclinized with chloritized biotite and characteristic synneusis-textured quartz; and (3) The variably altered roof facies of the Bobbejaankop granite known as the Lease microgranite. The Bobbejaankop and Lease granites were both extensively mined for

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Shellnutt, J. Gregory, Ngoc Ha T. Pham, Steven W. Denyszyn, Meng-Wan Yeh, and Tung-Yi Lee. "Timing of collisional and post-collisional Pan-African Orogeny silicic magmatism in south-central Chad." Precambrian Research 301 (October 2017): 113–23. http://dx.doi.org/10.1016/j.precamres.2017.08.021.

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de Beer, C. H., and P. H. Macey. "Lithostratigraphy of the Mesoproterozoic Windpoort Granite (Spektakel Suite), western Namaqualand, South Africa." South African Journal of Geology 122, no. 2 (2019): 249–56. http://dx.doi.org/10.25131/sajg.122.0017.

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AbstractThe Windpoort Granite is a porphyritic, leucocratic granite belonging to the Spektakel Suite, a group of late- to post-tectonic granites intruded into the orthogneisses and supracrustal metamorphic rocks in western Namaqualand. Like other granites of this type, it is devoid of penetrative tectonic foliation, at most displaying a magmatic foliation parallel to the boundaries of the intrusion. Its main characteristic setting it apart from other Spektakel Suite granites in western Namaqualand is its tightly packed arrangement of small stubby alkali feldspar phenocrysts. Its U-Pb LA-ICPMS

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Plasman, Matthieu, Sophie Hautot, Pascal Tarits, et al. "Lithospheric Structure of a Transitional Magmatic to Amagmatic Continental Rift System—Insights from Magnetotelluric and Local Tomography Studies in the North Tanzanian Divergence, East African Rift." Geosciences 9, no. 11 (2019): 462. http://dx.doi.org/10.3390/geosciences9110462.

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Continental break-up is controlled by several parameters and processes (rheology, inherited structures, magmatism, etc). Their impact, chronology and interactions are still poorly known and debated, particularly when rifting interacts with cratons. In order to better understand the rifting initiation in a cratonic lithosphere, we analysed 22 magnetotelluric (MT) soundings collected along two East-West profiles in two different rift segments of the North Tanzanian Divergence. The North Tanzanian Divergence, where the East African Rift is at its earliest stage, is a remarkable example of the tra

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Morel, M. L. A., N. S. C. Simon, G. R. Davies, and G. D. Pearson. "Modification of cratonic lithosphere: Influence of tectono-magmatic events on Kaapvaal craton (South Africa)." Geochimica et Cosmochimica Acta 70, no. 18 (2006): A428. http://dx.doi.org/10.1016/j.gca.2006.06.862.

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Upton, Brian G. J. "Tectono-magmatic evolution of the younger Gardar southern rift, South Greenland." Geological Survey of Denmark and Greenland (GEUS) Bulletin 29 (November 8, 2013): 1–24. http://dx.doi.org/10.34194/geusb.v29.4692.

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The 1300–1140 Ma Gardar period in South Greenland involved continental rifting, sedimentation and alkaline magmatism. The latest magmatism was located along two parallel rift zones, Isortoq–Nunarsuit in the north and the Tuttutooq–Ilimmaasaq–Narsarsuaq zone in the south addressed here. The intrusive rocks crystallised at a depth of troctolitic gabbros. These relatively reduced magmas evolved through marked iron enrichment to alkaline salic differentiates. In the Older giant dyke complex, undersaturated augite syenites grade into sodalite foyaite. The larger, c . 1163 Ma Younger giant dyke comp

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Déléris, J., A. Nédélec, E. Ferré, et al. "The Pan-African Toro Complex (northern Nigeria): magmatic interactions and structures in a bimodal intrusion." Geological Magazine 133, no. 5 (1996): 535–52. http://dx.doi.org/10.1017/s0016756800007822.

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AbstractThe Toro Complex is one of the Pan-African Older Granites of Nigeria, first described as a reversely zoned pluton made of a central dioritic mass surrounded by a broad granitic rim. It has been thoroughly reinvestigated both from the petrographic and structural points of view, with the help of systematic anisotropy of magnetic susceptibility (AMS) measurements. The granite main body is a hornblende–biotite porphyritic monzogranite characterized by an early submagmatic fabric displaying a concentric pattern of foliations and west plunging lineations (stage 1). This fabric is overprinted

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Maier, W. D. "The potential for magmatic Ni sulfide ores in South African komatiites: a review." South African Journal of Geology 106, no. 1 (2003): 35–40. http://dx.doi.org/10.2113/1060035.

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