Isotope data on the age and genesis of layered basic-ultrabasic intrusions in the Kola Peninsula and northern Karelia, northeastern Baltic Shield
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The Precambrian drift history and paleogeography of Baltica
2021, Ancient Supercontinents and the Paleogeography of EarthNeoarchean–Paleoproterozoic supercycles
2021, Ancient Supercontinents and the Paleogeography of EarthUltra-depleted 2.05 Ga komatiites of Finnish Lapland: Products of grainy late accretion or core-mantle interaction?
2020, Chemical GeologyCitation Excerpt :Any event that occurred later than that would not have afforded sufficient time to develop such radiogenic ε143Nd and ε176Hf in the mantle domain. It is noteworthy that 2.45 Ga coincides with the ages of abundant mafic layered intrusions (Alapieti et al., 1990; Balashov et al., 1993; Amelin et al., 1995; Yang et al., 2016) and komatiitic lavas (Puchtel et al., 1997, 2016b) throughout the Fennoscandian Shield, indicating that large volumes of mafic magma were indeed produced in this part of the planet at that time. Using this extent and time of melting, and applying a bulk DRe = 0.2, model calculations indicate that the melting event that produced this light REE depletion would have reduced the 187Re/188Os ratio in the chondritic reservoir from 0.4019 to 0.2694 at 2.45 Ga.
Chemical weathering of mafic rocks in boreal subarctic environment (northwest Russia) under influence of glacial moraine deposits
2019, Chemical GeologyCitation Excerpt :Detailed geological and petrological descriptions of the Kivakka layered intrusion can be found in the work of Koptev-Dvornikov (2001). The isotopic dating of the massif yielded the following ages: 2420 ± 23 Ma (SmNd), 2445 ± 3.4 Ma (Zr) and 2444 ± 1 Ma and 2445 ± 2 Ma (Amelin and Semenov, 1990a, 1990b, 1996; Barkov et al., 1991; Balashov et al., 1993). The climate of most of the territory is mildly cold, transitionining between oceanic and continental, with a dominant influence of the Arctic and Northern Atlantics.