Late Paleoproterozoic mafic magmatism and the Kalahari craton during Columbia assembly
(2021) In Geology 49(11). p.1375-1380- 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,... (More)
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
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- author
- Djeutchou, Cedric ; de Kock, Michiel O. ; Wabo, Hervé ; Gaitán, Camilo E. ; Söderlund, Ulf LU and Gumsley, Ashley P. LU
- organization
- publishing date
- 2021-11
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Geology
- volume
- 49
- issue
- 11
- pages
- 6 pages
- publisher
- Geological Society of America
- external identifiers
-
- scopus:85118656332
- ISSN
- 0091-7613
- DOI
- 10.1130/G48811.1
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2021 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license
- id
- 54e323f8-79d1-4ac6-8003-bea26b74bf7c
- date added to LUP
- 2021-11-22 12:14:57
- date last changed
- 2022-04-27 05:54:44
@article{54e323f8-79d1-4ac6-8003-bea26b74bf7c, abstract = {{<p>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</p>}}, author = {{Djeutchou, Cedric and de Kock, Michiel O. and Wabo, Hervé and Gaitán, Camilo E. and Söderlund, Ulf and Gumsley, Ashley P.}}, issn = {{0091-7613}}, language = {{eng}}, number = {{11}}, pages = {{1375--1380}}, publisher = {{Geological Society of America}}, series = {{Geology}}, title = {{Late Paleoproterozoic mafic magmatism and the Kalahari craton during Columbia assembly}}, url = {{http://dx.doi.org/10.1130/G48811.1}}, doi = {{10.1130/G48811.1}}, volume = {{49}}, year = {{2021}}, }