scholarly journals The exotic inim block of the argun continental superterrane of the central asian fold belt: results of U-Th-pb geochronological (LA-ICP-MS) and Sm-Nd isotopic-geochemical studies

2019 ◽  
Vol 484 (6) ◽  
pp. 734-738
Author(s):  
R. O. Ovchinnikov ◽  
A. A. Sorokin ◽  
A. B. Kotov ◽  
E. B. Sal'nikova ◽  
V. P. Kovach ◽  
...  
Keyword(s):  
Continental Crust ◽  
Central Asian Fold Belt ◽  
Fold Belt ◽  
Early Precambrian ◽  
Metasedimentary Rocks ◽  
Tectonic Events ◽  
Central Asian ◽  
Icp Ms ◽  
Archean Crust ◽  
Geochemical Studies

The results of studies indicate that the age of the protoliths of garnet-bearing biotite–sericite–muscovite schists of the Inim Block is <991 Ma, and they are derived from rocks of the Neo-, Meso-, and Paleoproterozoic (as well as Archean) crust. This suggests that the Inim Block is exotic relatively to the Argun Superterrane due to the formation of the protolith of its metasedimentary rocks largely from erosion products of the Early Precambrian continental crust, the presence of which within the Argun Superterrane is not proven. It is not excluded that the Inim Block is a fragment of the Dzhugdzhur–Stanovoi Superterrane implanted in the structure of the Argun Superterrane as a result of Mesozoic tectonic events.

The Exotic Inim Block of the Argun Superterrane of the Central Asian Fold Belt: Results of U–Th–Pb Geochronological (LA-ICP-MS) and Sm–Nd Isotopic–Geochemical Studies

2019 ◽  
Vol 484 (2) ◽  
pp. 151-155
Author(s):  
R. O. Ovchinnikov ◽  
A. A. Sorokin ◽  
A. B. Kotov ◽  
E. B. Sal’nikova ◽  
V. P. Kovach ◽  
...  
Keyword(s):  
Central Asian Fold Belt ◽  
Fold Belt ◽  
Central Asian ◽  
Icp Ms ◽  
Geochemical Studies

scholarly journals Age and formation features of the Ordovician Chalovskaya sequence in the Argun Massif, eastern part of the Central Asian fold belt

2019 ◽  
Vol 27 (3) ◽  
pp. 3-23
Author(s):  
Yu. N. Smirnova ◽  
A. A. Sorokin
Keyword(s):  
Active Continental Margin ◽  
Detrital Zircons ◽  
Central Asian Fold Belt ◽  
Early Paleozoic ◽  
Fold Belt ◽  
Late Precambrian ◽  
Central Asian ◽  
Icp Ms ◽  
Geochemical Studies ◽  
Metaterrigenous Rocks

In this paper we present the results of the mineralogical and geochemical studies of metaterrigenous rocks of the Grebnev and Magdagachi formations of the Chalovskaya Sequence – one of the key stratigraphic divisions of the Argun continental Massif in the eastern part of the Central Asian fold belt, and U–Pb geochronological (LA-ICP-MS) data for the detrital zircons from these rocks. It is established that the youngest zircons in the metasandstones of the Grebnev Formation have an age of ~478 Ma, and in the metaalevrolites of the Magdagachi Formation ~448 Ma. Together with the previously obtained data on the age of metadacites from the Isagachi Formation (476 ± 8 Ma), this information indicates the Ordovician age of the Chalovskaya Sequence, previously attributed to the Late Precambrian. It was shown that the accumulation of sediments of the Chalovskaya Sequence took place in an environment of an active continental margin or island arc simultaneously with intense magmatic activity. Taking into account the fact that the Early Paleozoic suprasubduction magmatism manifested within all the continental massifs of the eastern part of the Central Asian fold belt (Argun, Mamyn, Bureya, Jiamusi, Khanka), it cannot be excluded that the mentioned continental massifs have a common geodynamic history.

Formation of the Neoproterozoic Continental Crust in the Structures of the Central Segment of the Central Asian Fold Belt

Petrology ◽  
2021 ◽  
Vol 29 (2) ◽  
pp. 195-220
Author(s):  
I. K. Kozakov ◽  
V. P. Kovach ◽  
E. B. Salnikova ◽  
A. N. Didenko ◽  
Yu. V. Plotkina ◽  
...  
Keyword(s):  
Continental Crust ◽  
Central Asian Fold Belt ◽  
Fold Belt ◽  
Central Segment ◽  
Central Asian

scholarly journals Age and sources of the Lower Mesozoic metasedimentary rocks of the Un'ja-Bom terrane in the Mongol-Okhotsk fold belt: results of the U–Th–Pb geohronological (LA–ICP–MS) AND Sm–Nd isotope studies

2019 ◽  
Vol 484 (4) ◽  
pp. 455-459
Author(s):  
V. A. Zaika ◽  
A. A. Sorokin ◽  
V. P. Kovach ◽  
A. P. Sorokin ◽  
A. B. Kotov
Keyword(s):  
Sedimentary Rocks ◽  
Detrital Zircons ◽  
Fold Belt ◽  
Relative Probability ◽  
Nd Isotope ◽  
Metasedimentary Rocks ◽  
Icp Ms ◽  
Isotope Studies ◽  
Geochemical Studies ◽  
Age Estimates

The results of the U—Th—Pb geochronological studies indicate that in the Un’ja-Bom terrane the youngest peaks on the relative probability curves of ages are 207 and 212 Ma for zircons from the metasiltstone of the Kurnal formation and from the metasiltstone of the Amkan formation. Similar age estimates for the youngest peaks were obtained for the detrital zircons from the metasedimentary rocks of the Tukuringra terrain of the eastern part of the Mongol-Okhotsk belt, which indicates that the Lower Mesozoic flyschoid complexes in the structure of this belt are developed much wider than is currently believed. The results obtained in our U—Th—Pb geochronological and Sm—Nd isotope geochemical studies suggest’s that the sedimentary rocks material was carried to the sedimentation basin mainly from the continental massifs of the Amur superterrane.

scholarly journals AGE OF THE EARLY PRECAMBRIAN (?) INTRUSIVE COMPLEXES OF THE NORTHERN BUREYA CONTINENTAL MASSIF, CENTRAL ASIAN FOLD BELT

2018 ◽  
Vol 37 (4) ◽  
pp. 56-70
Author(s):  
R.O. Ovchinnikov ◽  
◽  
A.A. Sorokin ◽  
N.M. Kudryashov ◽  
◽  
...  
Keyword(s):  
Central Asian Fold Belt ◽  
Fold Belt ◽  
Massif Central ◽  
Early Precambrian ◽  
Central Asian
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