Ulf Söderlund
Professor
Late Paleoproterozoic mafic magmatism and the Kalahari craton during Columbia assembly
Author
Summary, in English
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 Ga Circum-Superior large igneous province
Department/s
- Lithosphere and Biosphere Science
Publishing year
2021-11
Language
English
Pages
1375-1380
Publication/Series
Geology
Volume
49
Issue
11
Document type
Journal article
Publisher
Geological Society of America
Topic
- Geology
Status
Published
ISBN/ISSN/Other
- ISSN: 0091-7613