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Paleomagnetic studi...
Paleomagnetic studies of rapakivi complexes in the Fennoscandian shield – Implications to the origin of Proterozoic massif-type anorthosite magmatism
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- Salminen, Johanna (författare)
- Geological Survey of Finland, P.O. Box 96, FI-02151 Espoo, Finland; Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Finland
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- Elming, Sten-åke (författare)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Mertanen, Satu (författare)
- Geological Survey of Finland, P.O. Box 96, FI-02151 Espoo, Finland
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- Wang, Chong (författare)
- Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Finland; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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- Almqvist, Bjarne (författare)
- Uppsala universitet,Geofysik,Department of Earths Sciences, Uppsala University, 75236 Uppsala, Sweden
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- Moakhar, Mohsen Oveisy (författare)
- Science Faculty, Physics Group, Razi University, Kermanshah, Iran
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Geological Survey of Finland, PO. Box 96, FI-02151 Espoo, Finland; Department of Geosciences and Geography, University of Helsinki, P.O. Box 64, 00014, Finland Geovetenskap och miljöteknik (creator_code:org_t)
- Elsevier, 2021
- 2021
- Engelska.
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Ingår i: Precambrian Research. - : Elsevier. - 0301-9268 .- 1872-7433. ; 365
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
Nyckelord
- Paleomagnetism
- Massif anorthosites
- Rapakivi
- Proterozoic
- Baltica
- Nuna supercontinent
- Prospekteringsgeofysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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