Rhodes University
Oxbow Section.xls (86 kB)

Stratigraphy and age of Karoo basalts of Lesotho and implications for correlations within the Karoo igneous province. Oxbow Section.xls

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posted on 2020-04-21, 10:09 authored by Julian S Marsh, Peter R Hooper, Jakub Rehacek, Robert A. Duncan, Alasdair R. Duncan
The Lesotho remnant contains the type succession for Karoo low-Ti basalts of central southern Africa. The 40Ar/39Ar dating indicates that the sequence was emplaced within a very short period at about 180 Ma and consists of a monotonous pile of compound basalt lava flows which lacks significant palaeosols and persistent sedimentary intercalations. We have used geochemistry to establish a stratigraphic subdivision of the lava pile. Thin units of basalt flows, the Moshesh's Ford, Golden Gate, Sani, Roma, Letele, and Wonderkop units, with diverse geochemical character and restricted geographical distribution, are present at the base of the succession.

Location of this section is described in Marsh et al. (1997) AGU Geophysical Monograph, 100, 247-272.

Title of data set: Oxbow Section

The Mahlasela Pass road has been reconstructed and lies to the N of the stream whereas the old pass, sampled for this collection, lay to the south.

Rahacek (1995) PhD thesis. Washington State University, designated samples OXB54-60 as belonging to the Pitseng Unit.


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