Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa)
The sedimentary rocks of the Karoo Supergroup in the Tuli Basin (South Africa) consist of various terrigenous clastic and chemical deposits (parabreccias, conglo-breccias, conglomerates, sandstones, fine-grained sediments, calcretes and silc~etes). Four stratigraphic units were identified: the Basal...
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Rhodes University
2001
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ftrhodesunivcory:vital:4999 2023-05-15T18:28:37+02:00 Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) Bordy, Emese M 2001 545 leaves pdf http://hdl.handle.net/10962/d1005612 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:4999 English eng Rhodes University Faculty of Science, Geology vital:4999 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:4999 http://hdl.handle.net/10962/d1005612 Bordy, Emese M River sediments -- South Africa Sedimentology Limpopo river Sedimentology -- Limpopo river Limpopo river (South africa) Thesis Doctoral PhD 2001 ftrhodesunivcory 2022-12-26T13:45:28Z The sedimentary rocks of the Karoo Supergroup in the Tuli Basin (South Africa) consist of various terrigenous clastic and chemical deposits (parabreccias, conglo-breccias, conglomerates, sandstones, fine-grained sediments, calcretes and silc~etes). Four stratigraphic units were identified: the Basal, Middle and· Upper Units, and the CI~rens Formation. The palaeo-environmental reconstructions of the four stratigraphic units are based on evidence provided by primary sedimentary structures, palaeo-flow measurements, clast size/shape analysis, petrographic studies, palaeontological findings, borehole data and stratigraphic relations. The facies associations of the Basal Unit are interpreted as colluvial fan and low sinuosity, braid~d river channel with coal-bearing overbank and thaw-lake deposits. The interpreted depositional environment implies a cold climate, non-glacial subarctic fluvio-Iacustrine system. The current indicators of the palaeo-river system suggest flow direction from ENE to WSW. The lithologies of the Basal Unit are very similar to the deposits of the fluvial interval in the Vryheid Formation (Ecca Group) of the main Karoo Basin. There is no indubitable evidence for glacial activity (e.g. striated pavements or clasts, varvites, etc.), therefore the presence of unequivocal Dwyka Group correlatives in the Tuli Basin remains uncertain. The sedimentary structures and palaeo-current analysis indicate that the beds of the Middle Unit were deposited by an ancient river system flowing in a north-northwesterly direction. A lack of good quality exposures did not allow the reconstruction of the fluvial style, but the available data indicate a high-energy, perhaps braided fluvial system. The lack of bio- and chronostr~igraphic control hampers precise correlation and enables only the lithocorrelation of the Middle Unit with other braided river systems either in the Beaufort Group or in the Molteno Formation of the main Karoo Basin. The depositional environment of the Upper Unit is interpreted as a ... Doctoral or Postdoctoral Thesis Subarctic Rhodes University Cory: Repository |
institution |
Open Polar |
collection |
Rhodes University Cory: Repository |
op_collection_id |
ftrhodesunivcory |
language |
English |
topic |
River sediments -- South Africa Sedimentology Limpopo river Sedimentology -- Limpopo river Limpopo river (South africa) |
spellingShingle |
River sediments -- South Africa Sedimentology Limpopo river Sedimentology -- Limpopo river Limpopo river (South africa) Bordy, Emese M Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
topic_facet |
River sediments -- South Africa Sedimentology Limpopo river Sedimentology -- Limpopo river Limpopo river (South africa) |
description |
The sedimentary rocks of the Karoo Supergroup in the Tuli Basin (South Africa) consist of various terrigenous clastic and chemical deposits (parabreccias, conglo-breccias, conglomerates, sandstones, fine-grained sediments, calcretes and silc~etes). Four stratigraphic units were identified: the Basal, Middle and· Upper Units, and the CI~rens Formation. The palaeo-environmental reconstructions of the four stratigraphic units are based on evidence provided by primary sedimentary structures, palaeo-flow measurements, clast size/shape analysis, petrographic studies, palaeontological findings, borehole data and stratigraphic relations. The facies associations of the Basal Unit are interpreted as colluvial fan and low sinuosity, braid~d river channel with coal-bearing overbank and thaw-lake deposits. The interpreted depositional environment implies a cold climate, non-glacial subarctic fluvio-Iacustrine system. The current indicators of the palaeo-river system suggest flow direction from ENE to WSW. The lithologies of the Basal Unit are very similar to the deposits of the fluvial interval in the Vryheid Formation (Ecca Group) of the main Karoo Basin. There is no indubitable evidence for glacial activity (e.g. striated pavements or clasts, varvites, etc.), therefore the presence of unequivocal Dwyka Group correlatives in the Tuli Basin remains uncertain. The sedimentary structures and palaeo-current analysis indicate that the beds of the Middle Unit were deposited by an ancient river system flowing in a north-northwesterly direction. A lack of good quality exposures did not allow the reconstruction of the fluvial style, but the available data indicate a high-energy, perhaps braided fluvial system. The lack of bio- and chronostr~igraphic control hampers precise correlation and enables only the lithocorrelation of the Middle Unit with other braided river systems either in the Beaufort Group or in the Molteno Formation of the main Karoo Basin. The depositional environment of the Upper Unit is interpreted as a ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Bordy, Emese M |
author_facet |
Bordy, Emese M |
author_sort |
Bordy, Emese M |
title |
Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
title_short |
Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
title_full |
Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
title_fullStr |
Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
title_full_unstemmed |
Sedimentology of the Karoo Supergroup in the Tuli Basin (Limpompo River area, South Africa) |
title_sort |
sedimentology of the karoo supergroup in the tuli basin (limpompo river area, south africa) |
publisher |
Rhodes University |
publishDate |
2001 |
url |
http://hdl.handle.net/10962/d1005612 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:4999 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
vital:4999 https://corycommons.ru.ac.za/vital/access/manager/Repository/vital:4999 http://hdl.handle.net/10962/d1005612 |
op_rights |
Bordy, Emese M |
_version_ |
1766211166169726976 |