Transitional (2.1 Ga) Fe-tholeiitic-tholeiitic magmatism in the Fennoscandian Shield signifying lithospheric thinning during Palaeoproterozoic extensional tectonics

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• 作者：Nykä ; nen ; Vesa M. ; Vuollo ; Jouni I. ; Liipo ; Jussi P. ; Piirainen ; Tauno A.
• 刊名：Precambrian Research
• 出版年：1994
• 出版时间：November, 1994
• 年：1994
• 卷：70
• 期：1-2
• 页码：45-65
• 全文大小：1.71 M

文摘

The Palaeoproterozoic sedimentary cover of the Archaean basement complex in the Fennoscandian Shield is intruded by several stages of mantle-derived magmas. The 2.1 Ga Fe-tholeiitic magmatism, which is characterized by hypabyssal intrusions, dykes and volcanic flows intersecting the cover, also forms a widespread dyke swarm within the basement in North Karelia, eastern Finland. There are certain differences between these age-related sets of dykes, suggesting lithospheric thinning resulting from extensional tectonics during 2.1 Ga events.