Late Paleoproterozoic mafic magmatism and the Kalahari craton during Columbia assembly

Cedric Djeutchou, Michiel O. de Kock, Hervé Wabo, Camilo E. Gaitán, Ulf Söderlund, Ashley P. Gumsley

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The 1.87–1.84 Ga Black Hills dike swarm of the Kalahari craton (South Africa) is coeval with several regional magmatic provinces used here to resolve the craton’s position during Columbia assembly. We report a new 1850 ± 4 Ma (U-Pb isotope dilution–thermal ionization mass spectrometry [ID-TIMS] on baddeleyite) crystallization age for one dike and new paleomagnetic data for 34 dikes of which 8 have precise U-Pb ages. Results are constrained by positive baked-contact and reversal tests, which combined with existing data produce a 1.87–1.84 Ga mean pole from 63 individual dikes. By integrating paleomagnetic and geochronological data sets, we calculate poles for three magmatic episodes and produce a magnetostratigraphic record. At 1.88 Ga, the Kalahari craton is reconstructed next to the Superior craton so that their ca. 2.0 Ga poles align. As such, magmatism forms part of a radiating pattern with the coeval ca. 1.88

Original languageEnglish
Pages (from-to)1375-1380
Number of pages6
JournalGeology
Volume49
Issue number11
DOIs
Publication statusPublished - Nov 2021

ASJC Scopus subject areas

  • Geology

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