Provenance Area and U-Pb Age of Detrital Zircons from the Upper Proterozoic Deposits of the Polar Urals

World Multidisciplinary Earth Sciences Symposium 2017

Ulyasheva, Natalia^1 ; Grakova, Oksana^1 ; Pystin, Aleksandr^1 ; Pystina, Yulia^1

Ural Branch of RAS, Komi Science Centre, Institute of Geology, Syktyvkar, Russia^1

关键词: Acid rocks;    Average composition;    Detrital zircon;    Limited distribution;    Metasedimentary rocks;    Precambrian;    Proterozoic;    Rare elements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/95/3/032027/pdf
DOI  :  10.1088/1755-1315/95/3/032027

来源: IOP

【 摘 要 】

Conducted isotopic-geochemical study of the Upper Proterozoic rocks of the Nyarovey series was provided from the Polar Urals. U-Pb LA-SF-ICP-MS dating of detrital zircons from metasandstone the lower part of the series showed that the eroded substrate was dominated by Proterozoic rocks. Analysis of the obtained dating allowed us to conclude that the final stages of sedimentation Nyarovey series are limited to the age of 660 million years ago. According to the contents of indicator rare elements in the meta-sedimentary rocks of the Nyarovey series, it was established that in the provenance area the acid rocks, as well as the formation of the basic and average composition, prevailed. The obtained results indicate the inaccuracy of the selection of the Nyarovey series as the Middle Riphean stratum and suggest that in the Upper Precambrian section of the Northern Urals region the Middle Riphean deposits, if present, have an extremely limited distribution. The obtained results indicate that the Nyarovey series is distinguished as the Middle Riphean of the strontium. They give reason to believe that in the Upper Precambrian section of the Northern Urals of the region, the Middle Riphean of sediment, if present, has extremely limited distribution.