Paleomagnetic studies of rapakivi complexes in the Fennoscandian Shield : Implications for the origin of Proterozoic massif-type anorthosite magmatism

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Salminen , J , Elming , S-A , Mertanen , S , Wang , C , Almqvist , B & Moakhar , M O 2021 , ' Paleomagnetic studies of rapakivi complexes in the Fennoscandian Shield : Implications for the origin of Proterozoic massif-type anorthosite magmatism ' , Precambrian Research , vol. 365 , 106406 . https://doi.org/10.1016/j.precamres.2021.106406

Title: Paleomagnetic studies of rapakivi complexes in the Fennoscandian Shield : Implications for the origin of Proterozoic massif-type anorthosite magmatism
Author: Salminen, Johanna; Elming, Sten-Ake; Mertanen, Satu; Wang, Chong; Almqvist, Bjarne; Moakhar, Mohsen Oveisy
Other contributor: University of Helsinki, Doctoral Programme in Geosciences
University of Helsinki, Geological Survey of Finland
University of Helsinki, Department of Geosciences and Geography

Date: 2021-10
Language: eng
Number of pages: 30
Belongs to series: Precambrian Research
ISSN: 0301-9268
DOI: https://doi.org/10.1016/j.precamres.2021.106406
URI: http://hdl.handle.net/10138/335786
Abstract: Paleomagnetic studies have been performed on five rapakivi related complexes in Sweden and Finland. Poles of varying quality have been defined and the majority of the similar to 1640-1497 Ma poles are clustering on low latitudinal positions. By combining data from similar to 1500 Ma intrusions a new high-quality pole (Plat: 13 degrees N; Plon: 190 degrees E; A(95): 11 degrees, K: 14) for Baltica has been defined. Tectonic reconstructions, on the basis of the new data and previously published high-quality data, indicate that Baltica experienced stable low latitude to equatorial positions during 1640-1470 Ma, temporally coinciding with globally pronounced rapakivi-anorthosite magmatism. Our study argues against single hotspot source for similar to 1640-1620 Ma, similar to 1590-1520 Ma, and 1470-1410 Ma rapakivianorthosites, but supports a model of large-scale superswell under a stationary low-latitude position of supercontinent Nuna for the origin of rapakivi-anorthosite magmatism. However, a possibility for convergent tectonism as the origin cannot be ruled out.
Subject: 1171 Geosciences
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