Paleomagnetic results from Saudi Arabia and the Permo-Triassic Pangea configuration

Paleomagnetic results from Saudi Arabia and the Permo-Triassic Pangea configuration The Pangea configuration for the interval of Late Carboniferous to Early Jurassic is still debated: was it similar to the well known Wegenerian Pangea or did Gondwanaland move with respect to Laurussia along a major right-lateral lineament of several thousand kilometres during the Triassic, as suggested by Irving? We try here to answer this important question with the paleomagnetic study of well dated Permo-Triassic sediments from a borehole in Saudi Arabia. Sediments of the same age have also been sampled at the surface, but proved to be remagnetized, probably by a strong desert alteration. The paleomagnetic study of the bore-hole core yielded a high temperature component magnetization thought to be of primary origin carried either by magnetite (Late Permian limestones) or hematite (Early Triassic red shales) with antipodal normal and reversed inclinations. Its co-latitude and pole directions compare well with those from a selection of South American, African, Madagascar, and Moroccan poles. A new reliable pole west Gondwana with a mean age of 244 ± 11 m.y. is derived (λ = 53.4°N, Φ = 259.4°E, A 95 = 3.6 in West African coordinates), and its comparison with the Laurussian poles of same age window strongly suggests a Pangea in which the northern part of South America was facing the east of North America (Pangea B of Irving) at the Permo-Triassic boundary. A large right-lateral strike-slip movement of some 3500 km during the Triassic is thus required to reconstruct Pangea to its Jurassic pre-Atlantic opening position. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Earth and Planetary Science Letters Elsevier

Paleomagnetic results from Saudi Arabia and the Permo-Triassic Pangea configuration

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Publisher
Elsevier
Copyright
Copyright © 1997 Elsevier Science B.V. All rights reserved.
ISSN
0012-821X
eISSN
1385-013X
DOI
10.1016/S0012-821X(97)00047-2
Publisher site
See Article on Publisher Site

Abstract

The Pangea configuration for the interval of Late Carboniferous to Early Jurassic is still debated: was it similar to the well known Wegenerian Pangea or did Gondwanaland move with respect to Laurussia along a major right-lateral lineament of several thousand kilometres during the Triassic, as suggested by Irving? We try here to answer this important question with the paleomagnetic study of well dated Permo-Triassic sediments from a borehole in Saudi Arabia. Sediments of the same age have also been sampled at the surface, but proved to be remagnetized, probably by a strong desert alteration. The paleomagnetic study of the bore-hole core yielded a high temperature component magnetization thought to be of primary origin carried either by magnetite (Late Permian limestones) or hematite (Early Triassic red shales) with antipodal normal and reversed inclinations. Its co-latitude and pole directions compare well with those from a selection of South American, African, Madagascar, and Moroccan poles. A new reliable pole west Gondwana with a mean age of 244 ± 11 m.y. is derived (λ = 53.4°N, Φ = 259.4°E, A 95 = 3.6 in West African coordinates), and its comparison with the Laurussian poles of same age window strongly suggests a Pangea in which the northern part of South America was facing the east of North America (Pangea B of Irving) at the Permo-Triassic boundary. A large right-lateral strike-slip movement of some 3500 km during the Triassic is thus required to reconstruct Pangea to its Jurassic pre-Atlantic opening position.

Journal

Earth and Planetary Science LettersElsevier

Published: May 1, 1997

References

  • Identification of ferromagnetic minerals in a rock by coercivity and unblocking temperature properties
    Lowrie, W.
  • Permo-Triassic reconstruction of western Pangea and the evolution of the Gulf of Mexico/Caribbean region
    Pindell, J.L.; Dewey, J.F.
  • Paleomagnetism of the Lesotho basalt, Southern Africa
    Kosterov, A.A.; Perrin, M.
  • Evolution of Pangea: paleomagnetic constraints from the Southern Alps, Italy
    Muttoni, G.; Kent, D.V.; Channell, J.E.T.
  • A Middle-Triassic paleomagnetic pole for the Eurasian plate from Heming (France)
    Théveniaut, H.; Besse, J.; Edel, J.B.; Westphal, M.; Duringer, P.

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