Paleomagnetism of 2.44 Ga mafic dykes in Russian Karelia, eastern Fennoscandian Shield — implications for continental reconstructions

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• 作者：Mertanen ; S. ; Halls ; H.C. ; Vuollo ; J.I. ; Pesonen ; L.J. ; Stepanov ; V.S.
• 关键词：Dikes ; Fennoscandia ; Paleomagnetism ; Paleoproterozoic ; Reconstruction
• 刊名：Precambrian Research
• 出版年：1999
• 出版时间：December, 1999
• 年：1999
• 卷：98
• 期：3-4
• 页码：197-221
• 全文大小：704 K

文摘

Results of a paleomagnetic study of Paleoproterozoic dykes and Archean host rocks in the eastern Fennoscandian shield are reported here. Most of the dykes are related to ca 2440Ma layered intrusions and have isotopic ages between 2349 and 2476Ma. The dykes form an extensive NW–SE and E–W trending swarm. The majority are unaltered gabbronorites which carry stable remanent magnetizations with multicomponent nature. The high temperature remanence component (D), which is thought to represent the primary 2.44Ga magnetization of the dykes, has a paleomagnetic pole at 20°S, 278.8°E (A95=6.0°, N