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Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn

Smirnov, Aleksey V. ; Evans, David A. D. ; Ernst, Richard E. ; Söderlund, Ulf LU and Li, Zheng-Xiang (2013) In Precambrian Research 224. p.11-22
Abstract
Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the similar to 2.41 Ga Widgiemooltha dyke swarm of the Yilgarn craton in western Australia, confirming earlier results from that unit, in which the primary origin of characteristic remanent magnetization is now confirmed by baked-contact tests. The corresponding paleomagnetic pole (10.2 degrees S, 159.2 degrees E, A(95) = 7.5 degrees), in combination with newly available ages on dykes from Zimbabwe, allow for a direct connection between the Zimbabwe and Yilgarn cratons at 2.41 Ga, with implied... (More)
Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the similar to 2.41 Ga Widgiemooltha dyke swarm of the Yilgarn craton in western Australia, confirming earlier results from that unit, in which the primary origin of characteristic remanent magnetization is now confirmed by baked-contact tests. The corresponding paleomagnetic pole (10.2 degrees S, 159.2 degrees E, A(95) = 7.5 degrees), in combination with newly available ages on dykes from Zimbabwe, allow for a direct connection between the Zimbabwe and Yilgarn cratons at 2.41 Ga, with implied connections as early as their cratonization intervals at 2.7-2.6 Ga. The proposed "Zimgarn" supercraton was likely distinct from Vaalbara (Kaapvaal plus Pilbara) at 2.4 Ga, but both of those entities independently fragmented at ca. 2.1-2.0 Ga, reassembling into the Kalahari and West Australian cratons by 1.95-1.8 Ga. (c) 2012 Elsevier B.V. All rights reserved. (Less)
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author
; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Paleomagnetism, Paleoproterozoic, Yilgarn, Pilbara, Zimbabve craton, Kaapvaal craton
in
Precambrian Research
volume
224
pages
11 - 22
publisher
Elsevier
external identifiers
  • wos:000313765800002
  • scopus:84867584189
ISSN
0301-9268
DOI
10.1016/j.precamres.2012.09.020
language
English
LU publication?
yes
id
2fa94aa0-c475-4521-9d24-9fda0ebac235 (old id 3596052)
date added to LUP
2016-04-01 10:09:31
date last changed
2022-04-12 02:28:23
@article{2fa94aa0-c475-4521-9d24-9fda0ebac235,
  abstract     = {{Original connections among the world's extant Archean cratons are becoming tractable by the use of integrated paleomagnetic and geochronologic studies on Paleoproterozoic mafic dyke swarms. Here we report new high-quality paleomagnetic data from the similar to 2.41 Ga Widgiemooltha dyke swarm of the Yilgarn craton in western Australia, confirming earlier results from that unit, in which the primary origin of characteristic remanent magnetization is now confirmed by baked-contact tests. The corresponding paleomagnetic pole (10.2 degrees S, 159.2 degrees E, A(95) = 7.5 degrees), in combination with newly available ages on dykes from Zimbabwe, allow for a direct connection between the Zimbabwe and Yilgarn cratons at 2.41 Ga, with implied connections as early as their cratonization intervals at 2.7-2.6 Ga. The proposed "Zimgarn" supercraton was likely distinct from Vaalbara (Kaapvaal plus Pilbara) at 2.4 Ga, but both of those entities independently fragmented at ca. 2.1-2.0 Ga, reassembling into the Kalahari and West Australian cratons by 1.95-1.8 Ga. (c) 2012 Elsevier B.V. All rights reserved.}},
  author       = {{Smirnov, Aleksey V. and Evans, David A. D. and Ernst, Richard E. and Söderlund, Ulf and Li, Zheng-Xiang}},
  issn         = {{0301-9268}},
  keywords     = {{Paleomagnetism; Paleoproterozoic; Yilgarn; Pilbara; Zimbabve craton; Kaapvaal craton}},
  language     = {{eng}},
  pages        = {{11--22}},
  publisher    = {{Elsevier}},
  series       = {{Precambrian Research}},
  title        = {{Trading partners: Tectonic ancestry of southern Africa and western Australia, in Archean supercratons Vaalbara and Zimgarn}},
  url          = {{http://dx.doi.org/10.1016/j.precamres.2012.09.020}},
  doi          = {{10.1016/j.precamres.2012.09.020}},
  volume       = {{224}},
  year         = {{2013}},
}