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K. Condie, C. O'Neill, R. Aster (2009)
Evidence and implications for a widespread magmatic shutdown for 250 My on EarthEarth and Planetary Science Letters, 282
P. Eriksson, K. Condie (2014)
Cratonic sedimentation regimes in the ca. 2450-2000Ma period: relationship to a possible widespread magmatic slowdown on Earth?Gondwana Research, 25
C. Partin, A. Bekker, P. Sylvester, N. Wodicka, R. Stern, T. Chacko, L. Heaman (2014)
Filling in the juvenile magmatic gap: Evidence for uninterrupted Paleoproterozoic plate tectonicsEarth and Planetary Science Letters, 388
A. Stepanova, E. Sal’nikova, A. Samsonov, S. Egorova, Y. Larionova, V. Stepanov (2015)
The 2.31 Ga mafic dykes in the Karelian Craton, eastern Fennoscandian shield: U–Pb age, source characteristics and implications for continental break-up processesPrecambrian Research, 259
(1984)
Mafic dikes of northern Karelia
The 2405 Ma and 2310 Ma Mafic Dyke Swarms in the Karelian Craton : Age , Chemical and Sr - Nd Isotope Composition , and Tectonic Setting
J. Salminen, H. Halls, S. Mertanen, L. Pesonen, J. Vuollo, U. Söderlund (2014)
Paleomagnetic and geochronological studies on Paleoproterozoic diabase dykes of Karelia, East Finland—Key for testing the Superia supercratonPrecambrian Research, 244
S. Pehrsson, K. Buchan, B. Eglington, R. Berman, R. Rainbird (2014)
Did plate tectonics shutdown in the Palaeoproterozoic? A view from the Siderian geologic recordGondwana Research, 26
ACTA GEOLOGICA SINICA (English Edition) Vol. 90 Supp. 1 July 2016 http://www.geojournals.cn/dzxben/ch/index.aspx http://mc.manuscriptcentral.com/ags Stepanova A.V., Salnikova E.B., Samsonov A.V., Larionova Yu.O., Egorova S.V., Stepanov V.S., 2016. The 2405 Ma and 2310 Ma Mafic Dyke Swarms in the Karelian Craton: Age, Chemical and Sr-Nd Isotope Composition, and Tectonic Setting. Acta Geologica Sinica (English Edition), 90(supp. 1): 123. The 2405 Ma and 2310 Ma Mafic Dyke Swarms in the Karelian Craton: Age, Chemical and Sr-Nd Isotope Composition, and Tectonic Setting 1 2 3 3 1 1 Stepanova A.V. , Salnikova E.B. , Samsonov A.V. , Larionova Yu.O. , Egorova S.V. , Stepanov V.S. 1 IG KarRC RAS, Petrozavodsk185910, Russia; 2 IPGG RAS, Saint-Petersburg, 199034, Russia; 3 IGEM RAS, Moscow, 119017, Russia Until recently the time period 2400 - 2200 Ma in the primary melts evolution originated via DM-type mantle Erath history was characterized by low amount of age data source melting. for igneous events, and was even considered as ‘magmatic Both ca. 2405 Ma and 2310 Ma age groups of dykes age gap’ (Condie et al, 2009; Eriksson and Condie, 2014). were previously considered as feeder system of Jatulian Nevertheless new age data received recently around the (2300-2100 Ma) continental flood basalts that are world (Partin et al, 2014; Pehrsson et al, 2014) suggest widespread in the Karelian craton because of strong that drawing a gap was a result of low amount of age data. similarity in their chemical composition (Ein, 1984). We get U-Pb (ID TIMS) baddeleyite age data for mafic These correlations with Middle Paleoproterozoic basalts dyke swarms in the Russian side of the Karelian craton suggest probability of wide spreading of ca. 2300 igneous that fall into the ‘magmatic age gap’ interval. event in the Fennoscandian Shield. Now the only one dyke of age 2405±5 Ma is recognized. This EW-oriented dyke is compositionally References Ein, A.S., 1984. Mafic dikes of northern Karelia, in: Intrusive similar with dykes of younger 2310 Ma event. These Basites and Hyperbasites of Karelia. Petrozavodsk, pp. 30–41. dolerites are evolved with low contents of MgO and high Condie, K.C., O’Neill, C., Aster, R.C., 2009. Evidence and Fe and Ti. They also characterized by low values of Nb/ implications for a widespread magmatic shutdown for 250 My Nb* = 0.32-0.35, and e (2400)=-0.2 that suggest high Nd on Earth. Earth and Planetary Science Letters 282, 294–298. degrees of crustal contamination. Eriksson, P.G., Condie, K.C., 2014. craton ic sedimentation The younger ca. 2310 Ga mafic dykes are wide spread regimes in the ca. 2450–2000Ma period: Relationship to a possible widespread magmatic slowdown on Earth? in the central and northern parts of the Karelian craton Gondwana Research 25, 30–47. (Salminen et al, 2014; Stepanova et al, 2015).This age Partin, C.A., Bekker, A., Sylvester, P.J., Wodicka, N., Stern, group includes low-Mg high-Fe tholeiitic dykes that vary R.A., Chacko, T., Heaman, L.M., 2014. Filling in the juvenile in trace element and Sr-Nd isotopic composition. magmatic gap: evidence for uninterrupted Paleoproterozoic In the central part of the craton these dykes form a plate tectonics. Earth and Planetary Science Letters 388, 123– regular swarm that traced for 40 km (Stepanova et al, Pehrsson, S.J., Buchan, K.L., Eglington, B.M., Berman, R.M., 2015). These dykes are evolved and intensively Rainbird, R.H., 2014. Did plate tectonics shutdown in the contaminated tholeiites with LREE enrichment, and e Nd Palaeoproterozoic? A view from the Siderian geologic values of +0.4-+0.8. record. Gondwana Research 26, 803–815. Another swarm of age ca. 2310 Ma recently recognized Salminen, J., Halls, H.C., Mertanen, S., Pesonen, L.J., Vuollo, J., in the northern part of the craton. The quartz-bearing Söderlund, U., 2014. Paleomagnetic and geochronological doleritic dykes vary in thickness from several meters up to studies on Paleoproterozoic diabase dykes of Karelia, East 100 meters and form regular NE-oriented swarm. Despite Finland—Key for testing the Superia supercraton. Precambrian Research 244, 87–99. the fact that these dykes are evolved they have relatively Stepanova, A. V., Salnikova, E.B., Samsonov, A. V., Egorova, S. low content of incompatible trace element concentrations, V., Larionova, Y.O., Stepanov, V.S., 2015. The 2.31Ga mafic flat HREE patterns, and slightly enriched LREEs. dykes in the Karelian craton , eastern Fennoscandian shield: Together with Nb/Nb* values of 0.5 and e values of Nd (2300) U–Pb age, source characteristics and implications for 1.7 suggest a crustal contamination involvement into continental break-up processes. Precambrian Research 259, 43–57. * Corresponding author. E-mail: stepanov@krc.karelia.ru
Acta Geologica Sinica (English Edition) – Wiley
Published: Oct 1, 2016
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