Paleoproterozoic evolution of Fennoscandia and Greenland  

作　　者：Raimo Lahtinen Adam A. Garde Victor A. Melezhik 

机构地区：[1]Geological Survey of Finland, P.O. Box 96, F1-02151 Espoo, Finland. [2]Geological Survey of Denmark and Greenland, Фster Voldgade 10, DK-1350 Copenhagen K, Denmark. [3]Geological Survey of Norway, N-7491 Trondheim, Norway University of Bergen, N-5007 Bergen, Norway.

出　　处：《Episodes》2008年第1期20-28,共9页地质幕（英文版）

摘　　要：The Paleoproterozoic evolution of Fennoscandia and Greenland can be divided into major rifting and orogenic stages. The Paleoproterozoic rifting of Fennoscandia started with 2.505-2.1 Ga, multiphase, southwest-prograding, intraplate rifting. Both Fennoscandia and Greenland experienced 2.1- 2.04 Ga drifting and separation of their Archean cratons by newly-formed oceans. The main Paleoproterozoic orogenic evolution of Fennoscandia resulted in the Lapland-Kola orogen （1.94-1.86 Ga） and the composite Svecofennian orogen （1.92-1.79 Ga）. The Paleoproterozoic orogens in Greenland, from north to south, are the lnglefield mobile belt （1.95-1.92 Ga）, the Rinkian .fold belt/Nagssugtoqidian orogen （1.88-1.83 Ga） and the Ketilidian orogen （c. 1.8 Ga）. The Lapland-Kola orogen, Inglefield mobile belt and the Rinkian fold belt/Nagssugtoqidian orogen are continent-continent collision zones with limited formation of new Paleoproterozoic crust, whereas the Ketilidian orogen displays a convergent plate-tectonic system, without subsequent collision. The composite Svecofennian orogen is responsible for the main Paleoproterozoic crustal growth of Fennoscandia.

关 键 词：演化过程 地球科学 格陵兰岛 芬诺斯坎底亚 

分 类 号：P53[天文地球—古生物学与地层学]