Mesoproterozoic geomagnetic reversal asymmetry in light of new paleomagnetic and geochronological data for the Häme dyke swarm, Finland: Implications for the Nuna supercontinent

详细信息    查看全文

• 作者：J. Salminen^a ; ^{Johanna.m.salminen@helsinki.fi} ; R. Klein^a ; ^{robert.klein@helsinki.fi} ; T. Veikkolainen^a ; ^{toni.veikkolainen@helsinki.fi} ; S. Mertanen^b ; ^{satu.mertanen@gtk.fi} ; I. M&auml ; ntt&auml ; ri^b ; ^{irmeli.manttari@gtk.fi}
• 关键词：Paleomagnetism ; Geochronology ; Nuna ; Reversal asymmetry ; Geocentric axial dipole
• 刊名：Precambrian Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：288
• 期：Complete
• 页码：1-22
• 全文大小：3533 K
• 卷排序：288

文摘

A new paleomagentic pole at 23.6°N, 209.8°E has been obtained for Häme dykes. Precise U-Pb ages of 1642 ± 2 Ma and 1647 ± 14 Ma for two reversely magnetized dykes are acquired. The pole is used to fix the core of the Nuna supercontinent on shallow latitudes. The Geocentric Axial Dipole model of the geomagnetic field is supported at 1.7–1.4 Ga.