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New U–Pb geochronologic and palaeomagnetic constraints on the late Palaeoproterozoic Hartley magmatic event : evidence for a potential large igneous province in the Kaapvaal Craton during Kalahari assembly, South Africa

Alebouyeh Semami, Farnaz; de Kock, Michiel; Söderlund, Ulf LU ; Gumsley, Ashley LU ; da Silva, Richard; Beukes, Nicolas and Armstrong, Richard (2016) In GFF 138(1). p.164-182
Abstract

The volcanic Hartley Formation (part of the Olifantshoek Supergroup, which is dominated by red bed successions) in South Africa recorded depositional and tectonic conditions along the western Kaapvaal Craton during the late Palaeoproterozoic. It formed in association with red bed deposition elsewhere in the cratonic hinterland and along the craton’s northern margin. However, the exact correlation of the Olifantshoek Supergroup with these other red-bed successions is hindered by poor geochronological constraints. Herein, we refine the age and palaeopole of the Hartley Formation, and provide geochronological constraints for large-scale 1.93–1.91 Ga bimodal magmatism on the Kaapvaal Craton (herein named the Hartley large igneous province).... (More)

The volcanic Hartley Formation (part of the Olifantshoek Supergroup, which is dominated by red bed successions) in South Africa recorded depositional and tectonic conditions along the western Kaapvaal Craton during the late Palaeoproterozoic. It formed in association with red bed deposition elsewhere in the cratonic hinterland and along the craton’s northern margin. However, the exact correlation of the Olifantshoek Supergroup with these other red-bed successions is hindered by poor geochronological constraints. Herein, we refine the age and palaeopole of the Hartley Formation, and provide geochronological constraints for large-scale 1.93–1.91 Ga bimodal magmatism on the Kaapvaal Craton (herein named the Hartley large igneous province). We present new age constraints for the mafic and felsic phases of this event at 1923 ± 6 Ma and 1920 ± 4 Ma, respectively, which includes the first reported age dating of the Tsineng Dyke Swarm that has been linked to Hartley volcanism. A mean 1.93–1.91 Ga palaeomagnetic pole for the Hartley large igneous province at 22.7°N, 328.6°E with A95 = 11.7° represents a significant improvement on a previously published virtual geomagnetic pole. This improved pole is used to refine the late Palaeoproterozoic apparent polar wander path of the Kaapvaal Craton. This can assist in correlation of red-bed successions in southern Africa.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
apparent polar wander path, dyke swarm, geochronology, large igneous province, Orosirian period, palaeomagnetism
in
GFF
volume
138
issue
1
pages
19 pages
publisher
Geological Society of Sweden
external identifiers
  • Scopus:84959093409
ISSN
1103-5897
DOI
10.1080/11035897.2015.1124917
language
English
LU publication?
yes
id
fb0a5552-b741-48ee-a1f4-201cf3783788
date added to LUP
2016-09-21 08:19:40
date last changed
2016-10-18 10:09:46
@misc{fb0a5552-b741-48ee-a1f4-201cf3783788,
  abstract     = {<p>The volcanic Hartley Formation (part of the Olifantshoek Supergroup, which is dominated by red bed successions) in South Africa recorded depositional and tectonic conditions along the western Kaapvaal Craton during the late Palaeoproterozoic. It formed in association with red bed deposition elsewhere in the cratonic hinterland and along the craton’s northern margin. However, the exact correlation of the Olifantshoek Supergroup with these other red-bed successions is hindered by poor geochronological constraints. Herein, we refine the age and palaeopole of the Hartley Formation, and provide geochronological constraints for large-scale 1.93–1.91 Ga bimodal magmatism on the Kaapvaal Craton (herein named the Hartley large igneous province). We present new age constraints for the mafic and felsic phases of this event at 1923 ± 6 Ma and 1920 ± 4 Ma, respectively, which includes the first reported age dating of the Tsineng Dyke Swarm that has been linked to Hartley volcanism. A mean 1.93–1.91 Ga palaeomagnetic pole for the Hartley large igneous province at 22.7°N, 328.6°E with A<sub>95</sub> = 11.7° represents a significant improvement on a previously published virtual geomagnetic pole. This improved pole is used to refine the late Palaeoproterozoic apparent polar wander path of the Kaapvaal Craton. This can assist in correlation of red-bed successions in southern Africa.</p>},
  author       = {Alebouyeh Semami, Farnaz and de Kock, Michiel and Söderlund, Ulf and Gumsley, Ashley and da Silva, Richard and Beukes, Nicolas and Armstrong, Richard},
  issn         = {1103-5897},
  keyword      = {apparent polar wander path,dyke swarm,geochronology,large igneous province,Orosirian period,palaeomagnetism},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {164--182},
  publisher    = {ARRAY(0x8983620)},
  series       = {GFF},
  title        = {New U–Pb geochronologic and palaeomagnetic constraints on the late Palaeoproterozoic Hartley magmatic event : evidence for a potential large igneous province in the Kaapvaal Craton during Kalahari assembly, South Africa},
  url          = {http://dx.doi.org/10.1080/11035897.2015.1124917},
  volume       = {138},
  year         = {2016},
}