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The Mutare–Fingeren dyke swarm : the enigma of the Kalahari Craton’s exit from supercontinent Rodinia

Gumsley, Ashley P. LU ; de Kock, Michiel ; Ernst, Richard ; Gumsley, Anna ; Hanson, Richard ; Kamo, Sandra ; Knoper, Michael ; Lewandowski, Marek ; Luks, Bartłomiej and Mamuse, Antony , et al. (2024) In Geological Society Special Publication 537. p.359-380
Abstract

The Rodinia supercontinent broke apart during the Neoproterozoic. Rodinia break-up is associated with widespread intraplate magmatism on many cratons, including the c. 720–719 Ma Franklin large igneous province (LIP) of Laurentia. Coeval magmatism has also been identified recently in Siberia and South China. This extensive magmatism terminates ∼1 myr before the onset of the Sturtian Snowball Earth. However, LIP-scale magmatism and global glaciation are probably related. U–Pb isotope dilution–thermal ionization mass spectrometry (ID-TIMS) baddeleyite dating herein identifies remnants of a new c. 724–712 Ma LIP on the eastern Kalahari Craton in southern Africa and East Antarctica: the combined Mutare–Fingeren Dyke Swarm. This dyke swarm... (More)

The Rodinia supercontinent broke apart during the Neoproterozoic. Rodinia break-up is associated with widespread intraplate magmatism on many cratons, including the c. 720–719 Ma Franklin large igneous province (LIP) of Laurentia. Coeval magmatism has also been identified recently in Siberia and South China. This extensive magmatism terminates ∼1 myr before the onset of the Sturtian Snowball Earth. However, LIP-scale magmatism and global glaciation are probably related. U–Pb isotope dilution–thermal ionization mass spectrometry (ID-TIMS) baddeleyite dating herein identifies remnants of a new c. 724–712 Ma LIP on the eastern Kalahari Craton in southern Africa and East Antarctica: the combined Mutare–Fingeren Dyke Swarm. This dyke swarm occurs in northeastern Zimbabwe (Mutare Dyke Swarm) and western Dronning Maud Land (Fin-geren Dyke Swarm). It has incompatible element-enriched mid-ocean ridge basalt-like geochemistry, suggest-ing an asthenospheric mantle source for the LIP. The Mutare–Fingeren LIP probably formed during rifting. This rifting would have occurred almost ∼100 myr earlier than previous estimates in eastern Kalahari. The placement of Kalahari against southeastern Laurentia in Rodinia is also questioned. Proposed alternatives, invoking link-ing terranes between Kalahari and southwestern Laurentia or close to northwestern Laurentia, also present chal-lenges with no discernible resolution. Nevertheless, LIP-scale magmatism being responsible for the Sturtian Snowball Earth significantly increases.

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publication status
published
subject
in
Geological Society Special Publication
volume
537
pages
22 pages
publisher
Geological Society of London
external identifiers
  • scopus:85177566674
ISSN
0305-8719
DOI
10.1144/SP537-2022-206
language
English
LU publication?
yes
id
335434a4-b8ec-4e9a-b5ff-cecf50e20a05
date added to LUP
2025-01-15 12:28:51
date last changed
2025-04-04 14:40:32
@article{335434a4-b8ec-4e9a-b5ff-cecf50e20a05,
  abstract     = {{<p>The Rodinia supercontinent broke apart during the Neoproterozoic. Rodinia break-up is associated with widespread intraplate magmatism on many cratons, including the c. 720–719 Ma Franklin large igneous province (LIP) of Laurentia. Coeval magmatism has also been identified recently in Siberia and South China. This extensive magmatism terminates ∼1 myr before the onset of the Sturtian Snowball Earth. However, LIP-scale magmatism and global glaciation are probably related. U–Pb isotope dilution–thermal ionization mass spectrometry (ID-TIMS) baddeleyite dating herein identifies remnants of a new c. 724–712 Ma LIP on the eastern Kalahari Craton in southern Africa and East Antarctica: the combined Mutare–Fingeren Dyke Swarm. This dyke swarm occurs in northeastern Zimbabwe (Mutare Dyke Swarm) and western Dronning Maud Land (Fin-geren Dyke Swarm). It has incompatible element-enriched mid-ocean ridge basalt-like geochemistry, suggest-ing an asthenospheric mantle source for the LIP. The Mutare–Fingeren LIP probably formed during rifting. This rifting would have occurred almost ∼100 myr earlier than previous estimates in eastern Kalahari. The placement of Kalahari against southeastern Laurentia in Rodinia is also questioned. Proposed alternatives, invoking link-ing terranes between Kalahari and southwestern Laurentia or close to northwestern Laurentia, also present chal-lenges with no discernible resolution. Nevertheless, LIP-scale magmatism being responsible for the Sturtian Snowball Earth significantly increases.</p>}},
  author       = {{Gumsley, Ashley P. and de Kock, Michiel and Ernst, Richard and Gumsley, Anna and Hanson, Richard and Kamo, Sandra and Knoper, Michael and Lewandowski, Marek and Luks, Bartłomiej and Mamuse, Antony and Söderlund, Ulf}},
  issn         = {{0305-8719}},
  language     = {{eng}},
  pages        = {{359--380}},
  publisher    = {{Geological Society of London}},
  series       = {{Geological Society Special Publication}},
  title        = {{The Mutare–Fingeren dyke swarm : the enigma of the Kalahari Craton’s exit from supercontinent Rodinia}},
  url          = {{http://dx.doi.org/10.1144/SP537-2022-206}},
  doi          = {{10.1144/SP537-2022-206}},
  volume       = {{537}},
  year         = {{2024}},
}