Lithostratigraphy of the Palaeoproterozoic Hekpoort formation (Pretoria Group, Transvaal Supergroup), South Africa

Show simple item record Lenhardt, Nils Altermann, W. Humbert, F. De Kock, M. 2021-10-08T10:09:38Z 2021-10-08T10:09:38Z 2020-12
dc.description.abstract The Palaeoproterozoic Hekpoort Formation of the Pretoria Group is a lava-dominated unit that has a basin-wide extent throughout the Transvaal sub-basin of South Africa. Additional correlative units may be present in the Kanye sub-basin of Botswana. The key characteristic of the formation is its general geochemical uniformity. Volcaniclastic and other sedimentary rocks are relatively rare throughout the succession but may be dominant in some locations. Hekpoort Formation outcrops are sporadic throughout the basin and mostly occur in the form of gentle hills and valleys, mainly encircling Archaean domes and the Palaeoproterozoic Bushveld Complex (BC). The unit is exposed in the western Pretoria Group basin, sitting unconformably either on the Timeball Hill Formation or Boshoek Formation, which is lenticular there, and on top of the Boshoek Formation in the east of the basin. The unit is unconformably overlain by the Dwaalheuwel Formation. The type-locality for the Hekpoort Formation is the Hekpoort farm (504 IQ Hekpoort), ca. 60 km to the west-southwest of Pretoria. However, no stratotype has ever been proposed. A lectostratotype, i.e., the Mooikloof area in Pretoria East, that can be enhanced by two reference stratotypes are proposed herein. The Hekpoort Formation was deposited in a cratonic subaerial setting, forming a large igneous province (LIP) in which short-termed localised ponds and small braided river systems existed. It therefore forms one of the major Palaeoproterozoic magmatic events on the Kaapvaal Craton. en_ZA
dc.description.department Geology en_ZA
dc.description.librarian am2021 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Lenhardt, N., Altermann, W., Humbert, F. et al. 2020, 'Lithostratigraphy of the Palaeoproterozoic Hekpoort Formation (Pretoria Group, Transvaal Supergroup), South Africa', South African Journal of Geology, vol. 123, no. 4, pp. 655-668. en_ZA
dc.identifier.issn 1012-0750
dc.identifier.other 10.25131/sajg.123.0043
dc.language.iso en en_ZA
dc.publisher Geological Society of South Africa en_ZA
dc.rights © 2020 Geological Society of South Africa en_ZA
dc.subject Lithostratigraphy en_ZA
dc.subject Palaeoproterozoic Hekpoort Formation en_ZA
dc.subject Pretoria Group en_ZA
dc.subject Botswana en_ZA
dc.title Lithostratigraphy of the Palaeoproterozoic Hekpoort formation (Pretoria Group, Transvaal Supergroup), South Africa en_ZA
dc.type Article en_ZA

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