Paleomagnetic studies of rapakivi complexes in the Fennoscandian shield – Implications to the origin of Proterozoic massif-type anorthosite magmatismVisa övriga samt affilieringar
2021 (Engelska)Ingår i: Precambrian Research, ISSN 0301-9268, E-ISSN 1872-7433, Vol. 365, artikel-id 106406Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
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 ∼1640–1497 Ma poles are clustering on low latitudinal positions. By combining data from ∼1500 Ma intrusions a new high-quality pole (Plat: 13°N; Plon: 190°E; A95: 11°, 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 ∼1640–1620 Ma, ∼1590–1520 Ma, and 1470–1410 Ma rapakivi-anorthosites, 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.
Ort, förlag, år, upplaga, sidor
Elsevier, 2021. Vol. 365, artikel-id 106406
Nationell ämneskategori
Geofysik
Forskningsämne
Prospekteringsgeofysik
Identifikatorer
URN: urn:nbn:se:ltu:diva-87300DOI: 10.1016/j.precamres.2021.106406ISI: 000703586700018Scopus ID: 2-s2.0-85118713174OAI: oai:DiVA.org:ltu-87300DiVA, id: diva2:1599250
Forskningsfinansiär
Finlands Akademi, 319277Vetenskapsrådet
Anmärkning
Validerad;2021;Nivå 2;2021-09-30 (alebob)
2021-09-302021-09-302025-10-21Bibliografiskt granskad