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Title

Style of rifting and the stages of Pangea breakup

Publication Year

2015

Author(s)
  • de Lamotte, Dominique Frizon
  • Fourdan, Brendan
  • Leleu, Sophie
  • Leparmentier, Francois
  • de Clarens, Philippe
Source
TECTONICS Volume: 34 Issue: 5 Pages: 1009-1029 Published: 2015
ISSN
0278-7407 eISSN: 1944-9194
Abstract

Pangea results from the progressive amalgamation of continental blocks achieved at 320Ma. Assuming that the ancient concept of active versus passive rifting remains pertinent as end-members of more complex processes, we show that the progressive Pangea breakup occurred through a succession of rifting episodes characterized by different tectonic evolutions. A first episode of passive continental rifting during the Upper Carboniferous and Permian led to the formation of the Neo-Tethys Ocean. Then at the beginning of Triassic times, two short episodes of active rifting associated to the Siberian and Emeishan large igneous provinces (LIPs) failed. The true disintegration of Pangea resulted from (1) a Triassic passive rifting leading to the emplacement of the central Atlantic magmatic province (200Ma) LIP and the subsequent opening of the central Atlantic Ocean during the lowermost Jurassic and from (2) a Lower Jurassic active rifting triggered by the Karoo-Ferrar LIP (183Ma), which led to the opening of the West Indian Ocean. The same sequence of passive then active rifting is observed during the Lower Cretaceous with, in between, the Parana-Etendeka LIP at 135Ma. We show that the relationships between the style of rifts and their breakdown or with the type of resulting margins (as magma poor or magma dominated) are not straightforward. Finally, we discuss the respective role of mantle global warming promoted by continental agglomeration and mantle plumes in the weakening of the continental lithosphere and their roles as rifting triggers.

Author Keyword(s)
  • Pangea breakup
  • rifting style
  • mantle plume
  • large igneous province
  • mantle global warming
KeyWord(s) Plus
  • ATLANTIC MAGMATIC PROVINCE
  • TRIASSIC-JURASSIC BOUNDARY
  • VOLCANIC RIFTED MARGINS
  • FLOOD BASALTS
  • MANTLE PLUMES
  • MORONDAVA BASIN
  • SIBERIAN TRAPS
  • LITHOSPHERIC EXTENSION
  • STRUCTURAL STYLES
  • PLATE-TECTONICS
ESI Discipline(s)
  • Geosciences
Web of Science Category(ies)
  • Geochemistry & Geophysics
Adress(es)

[de Lamotte, Dominique Frizon] Univ Cergy Pontoise, Dept Sci Terre & Environm, Pontoise, France; [de Lamotte, Dominique Frizon; Leparmentier, Francois; de Clarens, Philippe] Total EP, Paris, France; [Fourdan, Brendan] Univ Rennes 1, Geosci Rennes CNRS UMR 6118, Rennes, France; [Leleu, Sophie] Univ Bordeaux Montaigne, ENSEGID, Bordeaux INP, Pessac, France

Reprint Adress

de Lamotte, DF (reprint author), Univ Cergy Pontoise, Dept Sci Terre & Environm, Pontoise, France.

Country(ies)
  • France
CNRS - Adress(es)
  • Géosciences Rennes, UMR6118
Accession Number
WOS:000356621800010
uid:/J7PNCP2V
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