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Geological Magazine; January 2002; v. 139; no. 1; p. 73-87; DOI: 10.1017/S0016756801006094
© 2002 Cambridge University Press (CUP)
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Article

Early Proterozoic nappe formation: an example from Sodankylä, Finland, Northern Baltic Shield

P. M. EVINS* and K. LAAJOKI

University of Oulu, Department of Geology, PL 3000, 90401, Oulu, Finland

* Author for correspondence: pevins{at}paju.oulu.fi

The Central Lapland Greenstone belt comprises rift-related metavolcanic and metasedimentary rocks representing one of the largest supracrustal belts in the Baltic Shield. The Sodankylä area in the central part of the belt represents a complex thrust duplex within a nappe overlying Belomorian Archaean basement and autocthonous Luirojoki calc-silicate rocks. Here, an early D1 schistosity is axial planar to at least three coaxial generations of southward-verging, subhorizontal, E–W-plunging D1 folds associated with major southwards thrusting. D2 is represented by broad, map-scale, upright, NE-trending folds in the south and crenulations in the north. Staurolite-grade metamorphism represented by post-tectonic andalusite + staurolite + kyanite assemblages occurred after D2 folding. Later D3 deformation was limited to local NW-trending folds and sinistral faults. The internal nappe-like structure of the Central Lapland Greenstone belt suggests that it represents the foreland of a large collisional complex cored by the Lapland Granulite belt.






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