Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin

D. A. Jerram, I. R. Sharp, T. H. Torsvik, R. Poulsen, T. Watton, U. Freitag, A. Halton, S. C. Sherlock, J. A.S. Malley, A. Finley, J. Roberge, R. Swart, C. Puigdefabregas, C. H. Ferreira, V. Machado

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

© 2018 Elsevier B.V. The breakup of Africa from South America is associated with the emplacement of the Paraná-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paraná-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39 Ar/ 40 Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82–81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.
Original languageAmerican English
JournalTectonophysics
DOIs
StatePublished - 1 Jan 2018

Fingerprint

Angola
Basalt
Tectonics
Stretching
volcanology
margins
paleontology
flood basalt
Namibia
plate tectonics
plates (tectonics)
emplacement
pulses
plume
basalt
plumes
Cretaceous
Africa
South America
trends

Cite this

Jerram, D. A. ; Sharp, I. R. ; Torsvik, T. H. ; Poulsen, R. ; Watton, T. ; Freitag, U. ; Halton, A. ; Sherlock, S. C. ; Malley, J. A.S. ; Finley, A. ; Roberge, J. ; Swart, R. ; Puigdefabregas, C. ; Ferreira, C. H. ; Machado, V. / Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin. In: Tectonophysics. 2018.
@article{e84c66b4b5d64e09b51d819a5ccdb713,
title = "Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin",
abstract = "{\circledC} 2018 Elsevier B.V. The breakup of Africa from South America is associated with the emplacement of the Paran{\'a}-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paran{\'a}-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39 Ar/ 40 Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82–81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.",
author = "Jerram, {D. A.} and Sharp, {I. R.} and Torsvik, {T. H.} and R. Poulsen and T. Watton and U. Freitag and A. Halton and Sherlock, {S. C.} and Malley, {J. A.S.} and A. Finley and J. Roberge and R. Swart and C. Puigdefabregas and Ferreira, {C. H.} and V. Machado",
year = "2018",
month = "1",
day = "1",
doi = "10.1016/j.tecto.2018.07.027",
language = "American English",
journal = "Tectonophysics",
issn = "0040-1951",
publisher = "Elsevier",

}

Jerram, DA, Sharp, IR, Torsvik, TH, Poulsen, R, Watton, T, Freitag, U, Halton, A, Sherlock, SC, Malley, JAS, Finley, A, Roberge, J, Swart, R, Puigdefabregas, C, Ferreira, CH & Machado, V 2018, 'Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin', Tectonophysics. https://doi.org/10.1016/j.tecto.2018.07.027

Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin. / Jerram, D. A.; Sharp, I. R.; Torsvik, T. H.; Poulsen, R.; Watton, T.; Freitag, U.; Halton, A.; Sherlock, S. C.; Malley, J. A.S.; Finley, A.; Roberge, J.; Swart, R.; Puigdefabregas, C.; Ferreira, C. H.; Machado, V.

In: Tectonophysics, 01.01.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Volcanic constraints on the unzipping of Africa from South America: Insights from new geochronological controls along the Angola margin

AU - Jerram, D. A.

AU - Sharp, I. R.

AU - Torsvik, T. H.

AU - Poulsen, R.

AU - Watton, T.

AU - Freitag, U.

AU - Halton, A.

AU - Sherlock, S. C.

AU - Malley, J. A.S.

AU - Finley, A.

AU - Roberge, J.

AU - Swart, R.

AU - Puigdefabregas, C.

AU - Ferreira, C. H.

AU - Machado, V.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - © 2018 Elsevier B.V. The breakup of Africa from South America is associated with the emplacement of the Paraná-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paraná-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39 Ar/ 40 Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82–81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.

AB - © 2018 Elsevier B.V. The breakup of Africa from South America is associated with the emplacement of the Paraná-Etendeka flood basalt province from around 134 Ma and the Tristan da Cunha plume. Yet many additional volcanic events occur that are younger than the main pulse of the Paraná-Etendeka and straddle the rift to drift phases of the main breakup. This contribution reports on new geochronological constraints from the Angolan part of the African Margin. Three coastal and one inland section have been sampled stretching across some 400 Km, with 39 Ar/ 40 Ar, U-Pb and Palaeontology used to provide age constraints. Ages from the new data range from ~100 to 81 Ma, with three main events (cr. 100, 91 and 82–81 Ma). Volcanic events are occurring within the Early to Late Cretaceous, along this part of the margin with a general younging towards Namibia. With the constraints of additional age information both onshore and offshore Angola, a clear younging trend at the early stages of rift to drift is recorded in the volcanic events that unzip from North to South. Similar age volcanic events are reported from the Brazilian side of the conjugate margin, and highlight the need to fully incorporate these relatively low volume volcanic pulses into the plate tectonic breakup models of the South Atlantic Margin.

UR - https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85056736457&origin=inward

UR - https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85056736457&origin=inward

U2 - 10.1016/j.tecto.2018.07.027

DO - 10.1016/j.tecto.2018.07.027

M3 - Article

JO - Tectonophysics

JF - Tectonophysics

SN - 0040-1951

ER -