Abstract
We performed U-Pb dating of detrital zircons collected from Middle–Upper Jurassic strata of the Sugoi synclinorium and Cretaceous rocks of the Omsukchan (Balygychan-Sugoi) basin, in order to identify their provenance and correlate Jurassic–Cretaceous sedimentation of the south-eastern Verkhoyansk-Kolyma orogenic belt with various magmatic belts of the north-east Asia active margins. In the Middle–Late Jurassic, the Uda-Murgal magmatic arc represented the main source area of clastics, suggesting that the Sugoi basin is a back-arc basin. A major shift in the provenance signature occurred during the Aptian, when granitoids of the Main (Kolyma) batholith belt, along with volcanic rocks of the Uyandina-Yasachnaya and Uda-Murgal arcs, became the main sources of clastics deposited in the Omsukchan basin. In a final Mesozoic provenance shift, granitoids of the Main (Kolyma) batholith belt, along with volcanic and plutonic rocks of the Uyandina-Yasachnaya and Okhotsk-Chukotka arcs, became the dominant sources for clastics in the Omsukchan basin in the latest Cretaceous. A broader comparison of detrital zircon age distributions in Jurassic–Cretaceous deposits across the south-eastern Verkhoyansk-Kolyma orogen illustrates that the Sugoi and Omsukchan basins did not form along the distal eastern portion of the Verkhoyansk passive margin, but in the Late Mesozoic back-arc basins.
Highlights
For almost 400 million years during the Early Paleozoic–Mesozoic, the Pacific Margin of NE Asia was characterized by the initiation, evolution, termination, and revival of Magmatic arcs in response to subduction and collisional processes along the complex, long-lived north-east Asia active Margins (Figure 1)
U-Pb dating of detrital zircons from Middle–Upper Jurassic clastic rocks of the Sugoi synclinorium and Cretaceous clastic and volcaniclastic rocks of the Omsukchan basin across the south-eastern Verkhoyansk-Kolyma orogenic belt has revealed new insights
U-Pb dating of detrital zircons from Middle–Upper Jurassic clastic rocks of the Sugoi synclinorium and Cretaceous clastic and volcaniclastic rocks of the Omsukchan basin across the south-eastern Verkhoyansk-Kolyma orogenic belt has revealed new insights regarding the Mesozoic tectonic and paleogeographic evolution of the area
Summary
For almost 400 million years during the Early Paleozoic–Mesozoic, the Pacific Margin of NE Asia was characterized by the initiation, evolution, termination, and revival of Magmatic arcs in response to subduction and collisional processes along the complex, long-lived north-east Asia active Margins (Figure 1). Fragments of the Paleozoic Magmatic arcs, such as the Maya-Abkit and North-Okhotsk arcs, are scattered within continental blocks of the Kolyma-Omolon Superterrane in the central part of the Verkhoyansk-Kolyma orogenic belt. We present the first detrital zircon U-Pb data from Mesozoic rocks in the Sugoi and Omsukchan (Balygychan-Sugoi) basins, located in the south-eastern part of the Verkhoyansk-Kolyma orogenic belt in north-east Asia in order to reconstruct the provenance and tectonic evolution of the this key part of NE Asia. The uppermost part of the succession of the Omolon Terrane comprises Devonian to early Mississippian arc-related volcanic rocks of the Kedon Formation (North-Okhotsk arc) and late Mississippian clastic rocks [5,8,27,28,29,30]. SHRIMP zircon U-Pb dating of small island arc-type granitic plutons within the Rassokha block of the Omulevka Terrane yielded a crystallization age of 440 ± 2 Ma [31] (Figure 1)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
