Geochemical Characteristics and Origin of the Lebowa Granite Suite, Bushveld Complex

Hill, Malcolm; Barker, Fred G.; Hunter, D.R.; Knight, R.J.

doi:10.1080/00206819709465331

Cited by 44 publications

(42 citation statements)

References 44 publications

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“…Recent petrogenetic models for A-type granites have involved either extensive crystallisation from mantle-derived magmas (+ crustal assimilation) or partial melting of crustal protoliths and the merits of these models have been extensively discussed in the literature (e.g. Collins et al, 1982, Clemens et al, 1986Whalen et al, 1987;Hill et al, 1996;Whalen et al, 1996). The ∂ 18 O values for the Lebowa Suite range from +5.9‰ to +9.5‰, which precludes a predominant pelitic source for the Suite (Hill et al, 1996).…”

Section: Geologic Settingmentioning

confidence: 98%

Rb-Sr and Nd-Sm isotopes in fluorite related to the granites of the Bushveld Complex

Kinnaird

Kruger

Cawthorn

2004

South African Journal of Geology

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Section: Geologic Settingmentioning

confidence: 98%

Rb-Sr and Nd-Sm isotopes in fluorite related to the granites of the Bushveld Complex

Kinnaird

Kruger

Cawthorn

2004

South African Journal of Geology

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“…Compared with the Fennoscandian bimodal suite the volume of both the granites in the Lebowa suite and the mafic rocks of the Bushveld complex is much larger (Hill et al, 1996;Kleemann and Twist, 1989). The Bushveld complex also shows a more intimate association between the mafic and the felsic members, with the granites intruding on top of the mafic layered intrusion (Hill et al, 1996;Wilson et al, 2000).…”

Section: Similar Early Paleoproterozoic Magmatism In Other Cratonsmentioning

confidence: 94%

“…The Bushveld complex also shows a more intimate association between the mafic and the felsic members, with the granites intruding on top of the mafic layered intrusion (Hill et al, 1996;Wilson et al, 2000). In Fennoscandia the only felsic intrusions that are found in the vicinity of the mafic layered intrusions are the Kynsijärvi syenite and the Nuorunen granite, both of which are found within some kilometers of the mafic complexes ( Figs.…”

Section: Similar Early Paleoproterozoic Magmatism In Other Cratonsmentioning

confidence: 95%

“…Amphibolites mostly produce tonalitic instead of granitic melts in the partial melting processes and thus cannot be considered as the most likely sources for the A-type granites (Beard and Lofgren, 1991;Patiño Douce and Beard, 1995;Rapp et al, 1991;Rushmer, 1991;Winther and Newton, 1991). Tonalites have been proposed as possible sources for the A-type granites (Skjerlie and Johnston, 1993), although they are not considered as viable sources for the more Lauri and Mänttäri, 2002;Lauri et al, 2006;Luukkonen, 1988;Mikkola et al, 2010) and the Lebowa granite suite, Bushveld complex, South Africa (includes La, Ce, Nd, Sm, Eu, Gd, Tb, Yb, and Lu in A, excludes Nb and Dy in B; data from Hill et al, 1996). The value plotted is the median value of each group.…”

Section: The Origin Of the Early Paleoproterozoic A-type Granite Magmasmentioning

confidence: 97%

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Early Paleoproterozoic felsic and mafic magmatism in the Karelian province of the Fennoscandian shield

Lauri

Mikkola

Karinen

2012

Lithos

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“…A-type silicic magmatism is most often connected to an extensional tectonic setting. Also, A-type volcanic rocks and granites are associated with some mafi c layered intrusions, like the Bushveld complex in South Africa (e.g., Walraven, 1985;Kleemann & Twist, 1989;Hill et al, 1996). In Bushveld, the silicic volcanic rocks predate the intrusion of the mafi c magma and the granites represent the latest phase of the extensional magmatic cycle.…”

Section: Geochemical Classifi Cation Based On Immobile Elementsmentioning

confidence: 99%

The earliest Paleoproterozoic supracrustal rocks in Koillismaa, northern Finland - Their petrographic and geochemical characteristics and lithostratigraphy

Lauri¹,

Karinen²,

Räsänen³

2003

Bull Geol Soc Finland

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The 2.44 Ga Koillismaa layered igneous complex (KLIC) in northern Finland is interpreted to have formed as a consequence of early Paleoproterozoic continental rifting. Associated with the mafi c layered intrusions are felsic to intermediate volcanic and plutonic rocks of approximately the same age. The supracrustal rocks on top of the KLIC have been divided into three stratigraphic groups. The lowermost of these, the Sirniö Group, is thought to predate the KLIC and thus to represent the original roof. The overlying Kynsijärvi and Hautavaara Groups are somewhat younger than the layered intrusions. The Sirniö Group comprises two formations of felsic and intermediate volcanic rocks. The Sirniövaara Formation, also called as the Koillismaa granophyre, consists of a thick rhyodacitic unit with granophyric groundmass and some breccia interlayers. The Sirniövaara rhyodacite consists of plagioclase, quartz and biotite. Minor and accessory phases include ilmenite, magnetite, apatite, titanite, zircon and fl uorite. Low-grade metamorphic minerals such as chlorite, epidote, carbonate and sericite are also commonly present. The granophyric texture is considered to have formed as a consequence of contact metamorphism and hydrothermal alteration associated with the emplacement of the KLIC. Above the Sirniövaara Formation is the Unijoki Formation, a heterogeneous group of felsic to intermediate volcanic rocks. The felsic rocks of the Unijoki Formation resemble the Sirniövaara rhyodacite whereas the intermediate rocks generally contain amphibole, instead of biotite, as the predominant mafi c mineral. The rocks of the Sirniö Group show A-type geochemical character, e.g., high alkali content, Fe/Mg, 10000*Ga/Al, LREE, Y and Zr. In addition to primary compositional variation, metamorphic, and possibly hydrothermal, disturbance are recorded in the Sirniö Group lithologies. We consider them to be an example of early Paleoproterozoic rift-related volcanic rocks and tentatively correlative to the Salla Group in northern Finland. Similar rift-related volcanic rocks of ~2.44 Ga age have also been described elsewhere in northern Finland, northwest Russia and the Kola Peninsula, commonly in close association with the 2.44 Ga mafi c layered intrusions.

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Geochemical Characteristics and Origin of the Lebowa Granite Suite, Bushveld Complex

Cited by 44 publications

References 44 publications

Rb-Sr and Nd-Sm isotopes in fluorite related to the granites of the Bushveld Complex

Rb-Sr and Nd-Sm isotopes in fluorite related to the granites of the Bushveld Complex

Early Paleoproterozoic felsic and mafic magmatism in the Karelian province of the Fennoscandian shield

The earliest Paleoproterozoic supracrustal rocks in Koillismaa, northern Finland - Their petrographic and geochemical characteristics and lithostratigraphy

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