Cretaceous erosion in central South Africa: evidence from upper-crustal xenoliths in kimberlite diatremes

Hanson, E Kelsey; Moore, John M; Bordy, Emese M; Marsh, Julian S; Howarth, Geoffrey H; Robey, Julian van Aardt

Title: Cretaceous erosion in central South Africa: evidence from upper-crustal xenoliths in kimberlite diatremes
Creator: Hanson, E Kelsey
Creator: Moore, John M
Creator: Bordy, Emese M
Creator: Marsh, Julian S
Creator: Howarth, Geoffrey H
Creator: Robey, Julian van Aardt
Date Issued: 2009
Date: 2009
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/144978
Identifier: vital:38397
Identifier: https://doi.org/10.2113/gssajg.112.2.125
Description: Twelve Group II and fourteen Group I kimberlite diatremes in central South Africa were examined for upper crustal xenoliths in order to estimate the extent of various lithological units of the Karoo Supergroup in the main Karoo basin at times of kimberlite eruption, the Cretaceous erosional history of the area, and the approximate vertical extent of the kimberlite diatremes prior to erosion. Sandstone and amygdaloidal basaltic lava xenoliths from the Karoo Supergroup were specifically selected as their modal mineralogies and geochemical compositions respectively can be attributed to specific stratigraphic positions within the Karoo Supergroup. Results indicated that, at the time of Group II kimberlite eruption (120 Ma), basaltic lavas of the Drakensberg Group covered the entire area, but by the time of Group I kimberlite eruption (85 Ma), they were restricted to the south-eastern half of the study area.
Format: 16 pages
Format: pdf
Language: English
Relation: South African Journal of Geology
Relation: Hanson, E.K., Moore, J.M., Bordy, E.M., Marsh, J.S., Howarth, G. and Robey, J.V.A., 2009. Cretaceous erosion in central South Africa: Evidence from upper-crustal xenoliths in kimberlite diatremes. South African Journal of Geology, 112(2), pp.125-140
Relation: South African Journal of Geology volume 112 number 2 125 140 September 2009 1012-0750
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the GeoScienceWorld Statement (https://pubs.geoscienceworld.org/pages/information_for_librarians)

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