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• W2000919623 abstract "The 1.88 Ga old within-plate continental tholeiites belong to the mainly metavolcanic, bimodal Bergslagen Supracrustal Series (BSS) in the Svecofennian domain of the Baltic shield. The BSS evolved in an intracontinental rift. Despite only moderate lithospheric extension (β < 2) the degree of mantle melting was relatively high (tholeiites instead of alkali-basalts), possibly due to the thermal state of the convecting upper mantle at the time, ca. 150°C hotter than at present and to a relatively low solidus temperature of the lithospheric mantle source. There are no indications for a mantle-plume origin of these continental basalts. The tholeiites are the (near-) surface expression of a 10–20 km thick magmatic crustal underplate that probably underlies most of the SW Svecofennian domain and caused the Svecofennian crust to be three-layered, thick, but yet isostatically stable. Underplating strengthened the lithosphere sufficiently to control the time of cratonization. Geodynamic models for the origin of the BSS consistent with our interpretations are gravitational collapse of an overthickened continental accreted terrane margin, or back-arc processes related to a marginal volcanic arc 250 km further south. A tentative reconstruction of relative plate motions during Svecofennian time indicates predominantly longitudinal motion of the plates in question and complies with the relatively slow latitudinal drift of the shield at the time. Recent ion-microprobe U-Pb ages of Proterozoic zircons in Svecofennian metasediments imply about 0.2 Ga of pre-Svecofennian crustal evolution, while the Nd model-ages of the most primitive metatholeiites may be indicative of initial mantle differentiation as early as 2.4 Ga BP, accompanying protocrust formation." @default.
• W2000919623 created "2016-06-24" @default.
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• W2000919623 date "1991-08-01" @default.
• W2000919623 modified "2023-09-23" @default.
• W2000919623 title "Early Proterozoic continental tholeiites from western Bergslagen, Central Sweden, III. Geodynamic inferences" @default.
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• W2000919623 doi "https://doi.org/10.1016/0301-9268(91)90082-l" @default.
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