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Radiometric dating at PTB sites in South Africa

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CaseHeader

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HeritageAuthority(s): 

Case Type: 

ProposalDescription: 

The End-Permian Mass Extinction (EPME) is generally regarded as the largest mass extinction in Phanerozoic history. In marine strata the main extinction event is well-constrained, and has been radiometrically-dated to an interval of some 60 000 years, approximately 251.9 million years ago. However, the age and duration of the EPME on land, as well as its possible synchronicity with that of the marine realm, is debated. Here, we aim to further our research on dating the EPME in the South African basin.

Expanded_Motivation: 

My colleagues and I recently collected sedimentological (facies sequences), palaeontological (biostratigraphic ranges), geochemical (stable isotope analyses) and detrital zircon (ID-TIMS) data from Nooitgedacht 68 in the Xhariep District of the South African Karoo Basinn. We demonstrated that the palaeontologically and sedimentologically defined Permo-Triassic boundary broadly agrees with our radiometric date. However, more recently Gastaldo et al also sampled detrital zircons from the same locality and obtained a Permian date, which was considered Triassic, casting doubt on our radiometric date and the position of the Permo-Triassic boundary in South Africa. Using detrital zircons instead of pristine ash beds is not ideal as there is a large margin of error. However, pristine ash beds have yet to be found at any PTB site in South Africa. The best way to remedy this is to collect many detrital samples through the EPME in order to obtain a trend. While we are doing this, we intend to collect any fossils we find at these sites.

ApplicationDate: 

Thursday, May 25, 2023 - 10:55

CaseID: 

21433

OtherReferences: 

ReferenceList: 

CitationReferenceTypeDate Retrieved
19. Botha, J., A. K. Huttenlocker, R. M. H. Smith, R. Prevec, P. Viglietti and S. P. Modesto. 2020. New geochemical and palaeontological data from the Permian-Triassic boundary in the South African Karoo Basin test the synchronicity of terrestrial and marine extinctions. Palaeogeography, Palaeoclimatology, Palaeoecology. 540: 109467. DOI: doi.org/10.1016/j.palaeo.2019.109467.
Thursday, May 25, 2023
 
 

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