論文

2015年5月

Significance of detrital zircons in Siluro-Devonian rocks from Iberia

JOURNAL OF THE GEOLOGICAL SOCIETY
  • G. Gutierrez-Alonso
  • ,
  • J. Fernandez-Suarez
  • ,
  • D. Pastor-Galan
  • ,
  • S. T. Johnston
  • ,
  • U. Linnemann
  • ,
  • M. Hofmann
  • ,
  • J. Shaw
  • ,
  • J. R. Colmenero
  • ,
  • P. Hernandez

172
3
開始ページ
309
終了ページ
322
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1144/jgs2014-118
出版者・発行元
GEOLOGICAL SOC PUBL HOUSE

Seven samples of Siluro-Devonian sedimentary rocks from the Cantabrian and Central Iberian zones of the Iberian Variscan belt have been investigated for provenance and contain four main age populations in variable relative proportion: Ediacaran-Cryogenian (c. 0.55-0.8 Ga), Tonian-Stenian (0.85-1.2 Ga), Palaeoproterozoic (c. 1.8-2.2 Ga) and Archaean (c. 2.5-3.3 Ga). Five samples contain very minor Palaeozoic (Cambrian) zircons and six samples contain minor but significant zircons of Middle and Early Mesoproterozoic (Ectasian-Calymmian, 1.6-1.8) age. These data highlight the transition from an arc environment to a stable platform following the opening of the Rheic Ocean. Variations in detrital zircon populations in Middle-Late Devonian times reflect the onset of Variscan convergence between Laurussia and Gondwana. The presence of a high proportion of zircons of Tonian-Stenian age in Devonian sedimentary rocks may be interpreted as (1) the existence of a large Tonian-Stenian arc terrane exposed in the NE African realm (in or around the Arabian-Nubian Shield), (2) the participation, from the Ordovician time, of a more easterly alongshore provenance of Tonian-Stenian zircons, and (3) an increase in the relative proportion of Tonian-Stenian zircons with respect to the Ediacaran-Cryogenian population owing to the drift of the Avalonian-Cadomian ribbon continent, or the progressive burial of Ediacaran-Cryogenian rocks coeval with the denudation of older source rocks from the craton interior.

Web of Science ® 被引用回数 : 16

リンク情報
DOI
https://doi.org/10.1144/jgs2014-118
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000353722600005&DestApp=WOS_CPL
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84928880652&origin=inward

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