Palaeomagnetism of Proterozoic rocks from the Ukrainian Shield: new tectonic reconstructions of the Ukrainian and Fennoscandian shields

Elming, Sten-åke; Mikhailova, N. P.; Kravchenko, S. N.

doi:10.1016/s0040-1951(01)00032-4

Cited by 41 publications

(17 citation statements)

References 29 publications

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“…During previous palaeomagnetic studies collections were taken at 9 sites throughout the VVM (Mikhailova et al, 1994;Elming et al, 2001). The position of sites is shown in Fig.…”

Section: Sampling and Laboratory Techniquementioning

confidence: 99%

“…According to this popular palaeogeographic model (e.g., Buchan et al, 2000;Elming et al, 2001) the East European Craton consists of Fennoscandia, Volgo-Uralia and Sarmatia. In turn, Sarmatia is composed of the Ukrainian Shield and Voronezh Massif.…”

Section: Introductionmentioning

confidence: 99%

“…Attempts were made to test a relative Mesoproterozoic position of Fennoscandia and Sarmatia comparing paleopoles of similar aged rocks from these continental landmasses (Iosifidi et al, 1998;Elming et al, 2001;Pesonen et al, 2003). Iosifidi et al (1998) suggested that the consolidation of Fennoscandia and Sarmatia took place between 1770−1340 Ma.…”

Section: Introductionmentioning

confidence: 99%

“…Iosifidi et al (1998) suggested that the consolidation of Fennoscandia and Sarmatia took place between 1770−1340 Ma. Elming et al (2001) concluded that the docking of these blocks occurred sometimes after 1800 Ma. Pesonen et al (2003) estimated the collision of the Fennoscandian and Ukrainian Shields to be between 1770 and 1700 Ma.…”

Section: Introductionmentioning

confidence: 99%

“…There are no signs of regional metamorphism and tectonic deformations within the pluton (Amelin et al, 1994). The anorthosites have been previously shown to possess a stable primary thermoremanent magnetization (Mikhailova et al, 1994;Elming et al, 2001). The anorthosites from the v. Golovino and v. Turchinka quarries (the VVM) are precisely dated by the U-Pb zircon/baddeleyite technique (Amelin et al, 1994;Verhoglyad, 1995).…”

Section: Introductionmentioning

confidence: 99%

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First estimate for the age of a mesoproterozoic palaeomagnetic pole from the Volodarsk-Volynsky Massif, the Ukrainian Shield

Kravchenko¹

2005

Stud Geophys Geod

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Palaeomagnetic data are presented from the southern Volodarsk-Volynsky Massif (VVM) of the Korosten Pluton, the Ukrainian Shield. Laboratory experiments (AF and thermal demagnetization, IRM acquisition, thermal separation), field tests (consistency and secular variation methods) and optical observations indicate that single domain and nearly single domain magnetite is the dominant carrier of a primary TRM in the anorthosites. Palaeomagnetic poles from the three sampling sites (Golovino and Turchinka quarries) are indistinguishable at the 95% confidence level and have been combined to yield a mean pole at P lat = 30°N, P lon = 178°E, a 95 = 3.4°. In the large slow cooling Korosten Pluton the U-Pb zircon/baddeleyite (U zb ) technique gives an age for the anorthosites, which are not equivalent to the time of magnetic blocking. Based on integrated analysis of geochronologic information and blockingtemperature data for magnetic minerals proposed by Briden et al. (1993), a first attempt has been undertaken to estimate the palaeomagnetic pole age from the Mesoproterozoic anorthosites. The Korosten Pluton has cooled from 850°C (the closure temperature of U-Pb systematics in zircon/baddeleyite) to 350°C (the closure temperature of K-Ar systematics in biotite) during 150 Ma after the emplacement of the anorthosites. Assuming a uniform cooling of the intrusion yields a rate of 3.3°C/Ma. The cooling rate for the granites is 3.1°C/Ma. The mafic and acid rocks have an average rate of 3.2°C/Ma. Using the cooling gradient for the VVM (3.2°C/Ma) and the mean natural blocking temperature of magnetite (520°C) can be determined a remanence age. The estimate for TRM acquisition is 1656 ± 10.0 Ma. The magnetic pole for the VVM is in good agreement with the mean pole from the Baltic quartz porphyry dykes with an age of 1630 − 1648 Ma. The VVM pole is best dated and requires a revision of the latest paleogeographic reconstructions for the Fennoscandian and Ukrainian Shields at 1770 and 1650 Ma. (Pesonen et al., 2003). K e y w o r d s : Mesoproterozoic, Ukrainian Shield, anorthosite, palaeomagnetism, pole age Stud.

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“…During previous palaeomagnetic studies collections were taken at 9 sites throughout the VVM (Mikhailova et al, 1994;Elming et al, 2001). The position of sites is shown in Fig.…”

Section: Sampling and Laboratory Techniquementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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