論文

査読有り
2015年6月

One or two oroclines in the Variscan orogen of Iberia? Implications for Pangea amalgamation

GEOLOGY
  • Daniel Pastor-Galan
  • ,
  • Thomas Groenewegen
  • ,
  • Daniel Brouwer
  • ,
  • Wout Krijgsman
  • ,
  • Mark J. Dekkers

43
6
開始ページ
527
終了ページ
530
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1130/G36701.1
出版者・発行元
GEOLOGICAL SOC AMER, INC

The supercontinent Pangea formed in the late Carboniferous as a result of the Gondwana-Laurussia collision, producing the strongly sinuous Variscan-Alleghanian orogen. Iberia is interpreted to comprise two Variscan bends, forming an S-shaped orogenic belt: the Cantabrian orocline to the north and the Central Iberian bend to the south. Coeval formation of both oroclines, however, requires significant north-south shortening (in present-day coordinates) during Pangea's amalgamation. In contrast to the Cantabrian orocline, neither the kinematics nor geometry of the Central Iberian bend is well constrained. We provide paleomagnetic data from the southern limb of the Central Iberian bend, showing similar to 60 degrees counterclockwise vertical axis rotation during the late Carboniferous to early Permian, comparable to that determined for the southern limb of the Cantabrian orocline. This result is incompatible with the hypothesized S-shaped bend in the Iberian Variscides. We argue that Central Iberia, if really bent, must have acquired its curvature before the Cantabrian orocline, the curvature being an inherited structure. We propose a new mechanism of Pangea formation, compatible with the geology, geochronology, and paleomagnetism, in which a clockwise rotation of Gondwana produces the necessary change in the stress field to form the late Variscan Cantabrian orocline.

Web of Science ® 被引用回数 : 37

リンク情報
DOI
https://doi.org/10.1130/G36701.1
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000358572600020&DestApp=WOS_CPL

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