Research output: Contribution to journal › Article › peer-review
Age and Sources of Rocks of the Kodar Group of the Udokan Complex (Aldan Shield): Results of Geochemical, U–Th–Pb (LA-ICP-MS) Geochronological and Nd–Hf Isotopic Studies. / Kovach, V. P.; Adamskaya, E. V.; Kotov, A. B. et al.
In: Stratigraphy and Geological Correlation, Vol. 32, No. 5, 10.2024, p. 445-468.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Age and Sources of Rocks of the Kodar Group of the Udokan Complex (Aldan Shield): Results of Geochemical, U–Th–Pb (LA-ICP-MS) Geochronological and Nd–Hf Isotopic Studies
AU - Kovach, V. P.
AU - Adamskaya, E. V.
AU - Kotov, A. B.
AU - Podkovyrov, V. N.
AU - Larin, A. M.
AU - Sklyarov, E. V.
AU - Zagornaya, N. Yu
AU - Skovitina, T. M.
AU - Plotkina, Yu V.
AU - Fedoseenko, A. M.
AU - Ton, Y.
N1 - This work was supported by the Russian Science Foundation (project no. 21-17-00164; geochronological, geochemical, and Nd–Hf isotopic studies) and state contract of the Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, no. FMUW-2022-0003
PY - 2024/10
Y1 - 2024/10
N2 - The results of geochemical and Nd isotopic studies of rocks and U–Th–Pb (LA-ICP-MS) geochronological and Hf isotopic studies of detrital zircon from metaterrigenous rocks of the Kodar Group of the Udokan Complex (Aldan Shield) are presented. It is established that the age of rocks of the Kodar Group is 1.99–1.91 Ga, whereas the age of rocks of the Chinei and Kemen groups of the Udokan Complex is 1.90–1.87 Ga (Kovach et al., 2018, 2023a). This allows us to raise the issue of recognition of the Kodar Group as an independent stratigraphic subdivision. The terrigenous rocks of the group were sourced from the Archean igneous and metamorphic rock of the Chara–Olekma Geoblock and probably the Kalar and Kurulta blocks of the Stanovoi suture zone, as well as the Paleoproterozoic (2.04–1.99, 2.08, 2.20, and 2.30 Ga) complexes of active continental margins or ensialic island arcs in the western–northwestern and southern (in the present-day coordinates) frame of the Chara–Olekma Geoblock, which are unidentified in the region at the current erosion level. Erosion of rocks of magmatic arcs and the continental slope led to the deposition of rocks of the Kodar Group in a retroarc foreland basin, whereas further collapse of the orogen and the formation of an intracontinental extension basin were responsible for the deposition of terrigenous rocks of the Chinei and Kemen groups. The obtained data indicate widespread previously unidentified Paleoproterozoic continental crust formation at about 2.04–1.97 Ga in the western part of the Aldan Shield.
AB - The results of geochemical and Nd isotopic studies of rocks and U–Th–Pb (LA-ICP-MS) geochronological and Hf isotopic studies of detrital zircon from metaterrigenous rocks of the Kodar Group of the Udokan Complex (Aldan Shield) are presented. It is established that the age of rocks of the Kodar Group is 1.99–1.91 Ga, whereas the age of rocks of the Chinei and Kemen groups of the Udokan Complex is 1.90–1.87 Ga (Kovach et al., 2018, 2023a). This allows us to raise the issue of recognition of the Kodar Group as an independent stratigraphic subdivision. The terrigenous rocks of the group were sourced from the Archean igneous and metamorphic rock of the Chara–Olekma Geoblock and probably the Kalar and Kurulta blocks of the Stanovoi suture zone, as well as the Paleoproterozoic (2.04–1.99, 2.08, 2.20, and 2.30 Ga) complexes of active continental margins or ensialic island arcs in the western–northwestern and southern (in the present-day coordinates) frame of the Chara–Olekma Geoblock, which are unidentified in the region at the current erosion level. Erosion of rocks of magmatic arcs and the continental slope led to the deposition of rocks of the Kodar Group in a retroarc foreland basin, whereas further collapse of the orogen and the formation of an intracontinental extension basin were responsible for the deposition of terrigenous rocks of the Chinei and Kemen groups. The obtained data indicate widespread previously unidentified Paleoproterozoic continental crust formation at about 2.04–1.97 Ga in the western part of the Aldan Shield.
KW - Aldan Shield
KW - Kodar Group
KW - Udokan Complex
KW - detrital zircon
KW - geochronology
KW - tectonic evolution
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85204421598&origin=inward&txGid=4cbd3c4e9b07cda77354be6359d0e171
UR - https://www.mendeley.com/catalogue/85a5a8e4-9dae-301d-8e8f-276b325f3f10/
U2 - 10.1134/S0869593824700102
DO - 10.1134/S0869593824700102
M3 - Article
VL - 32
SP - 445
EP - 468
JO - Stratigraphy and Geological Correlation
JF - Stratigraphy and Geological Correlation
SN - 0869-5938
IS - 5
ER -
ID: 60794380