First findings of Paleo- and Mesoarchean zircons in the rocks from the Central Arctic province of oceanic rises as an evidence of the ancient continental crust. / Sergeev, S.A.; Presnyakov, S.L.; Antonov, A.V.; Belyatsky, B.V.; Rodionov, N.V.; Shevchenko, S.S.
In: Doklady Earth Sciences, Vol. 463, No. 1, 2015, p. 684-689.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - First findings of Paleo- and Mesoarchean zircons in the rocks from the Central Arctic province of oceanic rises as an evidence of the ancient continental crust
AU - Sergeev, S.A.
AU - Presnyakov, S.L.
AU - Antonov, A.V.
AU - Belyatsky, B.V.
AU - Rodionov, N.V.
AU - Shevchenko, S.S.
PY - 2015
Y1 - 2015
N2 - © 2015, Pleiades Publishing, Ltd. This report presents the results of local U–Pb zircon dating (SIMS SHRIMP II) for a sample of migmatite gneiss dredged on the western slope of Alpha Ridge in the Arctic Ocean in the course of the “Arktika-2012” Russian polar expedition. The distribution of U–Pb ages of the examined zircon points to the Early Precambrian origin of this gneiss, for the bulk of the zircon was crystallized at least 3450 Ma ago from a magmatic melt under acidic volcanism at the primary crust formation. Zircon of the second generation was crystallized 3300 Ma ago under the remelting of acid volcanics and appearance of migmatite gneisses under the amphibolite facies of metamorphism. Most likely, a partial recrystallization of zircon and formation of microfolded structures and foliation took place 3000 Ma ago at the stage of rocks deformation. The latest zircon was formed 1900 Ma ago from the crust fluid or melt under the low-gradient metamorphism. In view of the possibility of the appearance of the
AB - © 2015, Pleiades Publishing, Ltd. This report presents the results of local U–Pb zircon dating (SIMS SHRIMP II) for a sample of migmatite gneiss dredged on the western slope of Alpha Ridge in the Arctic Ocean in the course of the “Arktika-2012” Russian polar expedition. The distribution of U–Pb ages of the examined zircon points to the Early Precambrian origin of this gneiss, for the bulk of the zircon was crystallized at least 3450 Ma ago from a magmatic melt under acidic volcanism at the primary crust formation. Zircon of the second generation was crystallized 3300 Ma ago under the remelting of acid volcanics and appearance of migmatite gneisses under the amphibolite facies of metamorphism. Most likely, a partial recrystallization of zircon and formation of microfolded structures and foliation took place 3000 Ma ago at the stage of rocks deformation. The latest zircon was formed 1900 Ma ago from the crust fluid or melt under the low-gradient metamorphism. In view of the possibility of the appearance of the
U2 - 10.1134/S1028334X15070053
DO - 10.1134/S1028334X15070053
M3 - Article
VL - 463
SP - 684
EP - 689
JO - Doklady Earth Sciences
JF - Doklady Earth Sciences
SN - 1028-334X
IS - 1
ER -
ID: 3980387