Lithostratigraphy of the palaeoproterozoic hekpoort formation (Pretoria group, transvaal supergroup), South Africa

Lenhardt，N.1; Altermann，W.2; Humbert，F.2,3; de Kock，M.2

2020

10.25131/sajg.123.0043

SOUTH AFRICAN JOURNAL OF GEOLOGY   影响因子和分区

1012-0750

1996-8590

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.

SCI

英语

其他

WOS:000599415200014

2-s2.0-85101311469

Scopus

1.Department of Geology,University of Pretoria,Pretoria,Private Bag X20,0028,South Africa
2.Department of Geology,University of Johannesburg,Johannesburg,P.O. Box 524, Auckland Park,2006,South Africa
3.Center of Marine Magnetism,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen, Guangdong,China

Lenhardt，N.,Altermann，W.,Humbert，F.,et al. Lithostratigraphy of the palaeoproterozoic hekpoort formation (Pretoria group, transvaal supergroup), South Africa[J]. SOUTH AFRICAN JOURNAL OF GEOLOGY,2020,123(4):655-668.

Lenhardt，N.,Altermann，W.,Humbert，F.,&de Kock，M..(2020).Lithostratigraphy of the palaeoproterozoic hekpoort formation (Pretoria group, transvaal supergroup), South Africa.SOUTH AFRICAN JOURNAL OF GEOLOGY,123(4),655-668.

Lenhardt，N.,et al."Lithostratigraphy of the palaeoproterozoic hekpoort formation (Pretoria group, transvaal supergroup), South Africa".SOUTH AFRICAN JOURNAL OF GEOLOGY 123.4(2020):655-668.