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Identification of the ca. 720 Ma Irkutsk LIP and its plume centre in southern Siberia : The initiation of Laurentia-Siberia separation

Ernst, R. E. ; Gladkochub, D. P. ; Söderlund, U. LU ; Donskaya, T. V. ; Pisarevsky, S. A. ; Mazukabzov, A. M. and El Bilali, H. (2023) In Precambrian Research 394.
Abstract

Widespread 720 Ma magmatism has been linked with the break-up of Rodinia and the onset of the Sturtian ‘Snowball Earth’ event. We report a new U-Pb baddeleyite age from the Baikal dyke subswarm in southern Siberia which increases the known extent of the 720 Ma Irkutsk LIP and confirms a previous hypothesis that the Baikal and Sayan subswarms converge at the southern tip of the Irkutsk promontory. Together they define a mantle plume centre with direct links to the 720 Ma Franklin plume centre of northern Laurentia, thus constraining the paleo-reconstruction of southern Siberia and northern Laurentia. It is inferred that this combined 720 Franklin – Irktusk LIP event is associated with the breakup of southern Siberia from northern... (More)

Widespread 720 Ma magmatism has been linked with the break-up of Rodinia and the onset of the Sturtian ‘Snowball Earth’ event. We report a new U-Pb baddeleyite age from the Baikal dyke subswarm in southern Siberia which increases the known extent of the 720 Ma Irkutsk LIP and confirms a previous hypothesis that the Baikal and Sayan subswarms converge at the southern tip of the Irkutsk promontory. Together they define a mantle plume centre with direct links to the 720 Ma Franklin plume centre of northern Laurentia, thus constraining the paleo-reconstruction of southern Siberia and northern Laurentia. It is inferred that this combined 720 Franklin – Irktusk LIP event is associated with the breakup of southern Siberia from northern Laurentia during fragmentation of the Rodinia supercontinent. Expansion of 720 Ma magmatism into Siberia greatly increases the scale of the Franklin-Irktusk LIP.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Continental Reconstruction, Dyke swarm, Large Igneous Province, LIP, U-Pb dating
in
Precambrian Research
volume
394
article number
107111
publisher
Elsevier
external identifiers
  • scopus:85163213283
ISSN
0301-9268
DOI
10.1016/j.precamres.2023.107111
language
English
LU publication?
yes
id
07e24e0e-739f-4236-a04f-7ae0649fbe1c
date added to LUP
2023-09-04 15:15:19
date last changed
2023-09-04 15:15:19
@article{07e24e0e-739f-4236-a04f-7ae0649fbe1c,
  abstract     = {{<p>Widespread 720 Ma magmatism has been linked with the break-up of Rodinia and the onset of the Sturtian ‘Snowball Earth’ event. We report a new U-Pb baddeleyite age from the Baikal dyke subswarm in southern Siberia which increases the known extent of the 720 Ma Irkutsk LIP and confirms a previous hypothesis that the Baikal and Sayan subswarms converge at the southern tip of the Irkutsk promontory. Together they define a mantle plume centre with direct links to the 720 Ma Franklin plume centre of northern Laurentia, thus constraining the paleo-reconstruction of southern Siberia and northern Laurentia. It is inferred that this combined 720 Franklin – Irktusk LIP event is associated with the breakup of southern Siberia from northern Laurentia during fragmentation of the Rodinia supercontinent. Expansion of 720 Ma magmatism into Siberia greatly increases the scale of the Franklin-Irktusk LIP.</p>}},
  author       = {{Ernst, R. E. and Gladkochub, D. P. and Söderlund, U. and Donskaya, T. V. and Pisarevsky, S. A. and Mazukabzov, A. M. and El Bilali, H.}},
  issn         = {{0301-9268}},
  keywords     = {{Continental Reconstruction; Dyke swarm; Large Igneous Province; LIP; U-Pb dating}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Precambrian Research}},
  title        = {{Identification of the ca. 720 Ma Irkutsk LIP and its plume centre in southern Siberia : The initiation of Laurentia-Siberia separation}},
  url          = {{http://dx.doi.org/10.1016/j.precamres.2023.107111}},
  doi          = {{10.1016/j.precamres.2023.107111}},
  volume       = {{394}},
  year         = {{2023}},
}