A late Paleoproterozoic key pole for the Fennoscandian Shield: A paleomagnetic study of the Keuruu diabase dykes, Central Finland
作者: R. KleinL.J. PesonenI. MänttäriJ.S. Heinonen
作者单位: 1Department of Physics, P.O. Box 64, University of Helsinki, FI-00014 Helsinki, Finland
2Geological Survey of Finland, P.O. Box 96, FI-02151 Espoo, Finland
3Department of Geosciences and Geography, P.O. Box 64, University of Helsinki, FI-00014, Finland
刊名: Precambrian Research, 2016, Vol.286 , pp.379-397
来源数据库: Elsevier Journal
DOI: 10.1016/j.precamres.2016.10.013
关键词: Fennoscandian ShieldLate PaleoproterozoicPaleomagnetismRock magnetismGeochemistry
英文摘要: Abstract(#br)We present an updated paleomagnetic pole and a new isotope age for the late Paleoproterozoic (Svecofennian) diabase dykes from Keuruu, Central Finland. The paleomagnetic results reveal a dual-polarity remanent magnetization with asymmetry, which we explain by an unremoved secondary component contaminating both normal (N) and reversed (R) vectors. The ChRM is carried by magnetite, most of which are primary grains crystallized from basaltic magma. The primary nature of the ChRM is further supported by positive baked contact tests. An R polarity dyke shows a U-Pb concordia age of 1870±9Ma. Zircons from another dyke of N polarity reveal a mean Pb-Pb age of 1867±8Ma....
全文获取路径: Elsevier  (合作)
影响因子:4.441 (2012)

  • magnetism 
  • Finland 芬兰
  • diabase 辉绿岩
  • study 学习