Silurian Granitoid Magmatism of the Rassokha Terrane (North-East Russia)

Sychev, S. N.; Khudoley, A. K.; Lebedeva, O. Yu.; Rogov, A. V.; Соколов, С. Д.; Chamberlain, Kevin R.; Maklashin, V. S.; Lvov, P. A.

doi:10.1134/s1028334x20100104

Cited by 4 publications

(5 citation statements)

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“…Zircons of these ages could also be sourced from the southern part of the Prikolyma Terrane, based on comparable derital zircon age signatures (1750-2800 Ma) in Devonian-Carboniferous strata from that region [21]. The Maya-Abkit Magmatic belt, in the eastern part of the Omulevka Terrane [31] and Omolon-Taigonos area [34], possibly represents the source area for the 420-430 Ma old zircon (Figures 8 and 9). Zircons of comparable ages have also been reported from Devonian-Carboniferous clastic rocks across the southern part of the Prikolyma Terrane [21].…”

Section: Discussionmentioning

confidence: 99%

“…Paleoproterozoic detrital zircons, with predominant age peaks at 1860-2050 Ma, were likely derived from metamorphic basement complexes in the Omolon Terrane [26,108,109] (Figure 8) or could alternatively have been recycled from Devonian-Carboniferous sedimentary strata deposited across the southern part of the Prikolyma Terrane [21]. The Ordovician-Silurian zircons were possibly sourced from the Maya-Abkit Magmatic belt (Figures 8 and 9), which contains volcanic rocks dated at 433-425 Ma and 440 ± 2 Ma in the Omolon-Taigonos area [34] and in the Rassokha block of the Omulevka Terrane [31], respectively (Figures 1 and 2). Alternatively, abundant 425-450 Ma zircons have also been reported from Emsian-Eifelian sandstones of southern Prikolyma [21] and could also be the source of similarly aged zircons in the Omsukchan basin.…”

Section: Discussionmentioning

confidence: 99%

“…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]. The Omulevka Terrane, in general, consists of Cambrian to Triassic clastic and carbonate rocks, but the Rassokha and Uvyazka blocks in the eastern part of the terrane contain Early Silurian arc-related felsic Magmatic rocks [31] and Middle Devonian trachyte plutons [32].…”

Section: Geological Setting 21 Kolyma-omolon Superterranementioning

confidence: 99%

“…In the South Verkhoyansk region, Ordovician Mafic dikes and sills with baddeleyite U-Pb ages of 445-458 Ma have been reported [35][36][37], while Ordovician arc-related volcanic and volcaniclastic rocks occur in the Omulevka Terrane [38][39][40]. 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).…”

Section: Main Paleozoic-mesozoic Magmatic Belts Of the Ne Asia Activementioning

confidence: 99%

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Detrital Zircon U-Pb Data for Jurassic–Cretaceous Strata from the South-Eastern Verkhoyansk-Kolyma Orogen—Correlations to Magmatic Arcs of the North-East Asia Active Margin

Ershova

Stöckli

2021

Minerals

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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.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Setting 21 Kolyma-omolon Superterranementioning

confidence: 99%

Section: Main Paleozoic-mesozoic Magmatic Belts Of the Ne Asia Activementioning

confidence: 99%

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Detrital Zircon U-Pb Data for Jurassic–Cretaceous Strata from the South-Eastern Verkhoyansk-Kolyma Orogen—Correlations to Magmatic Arcs of the North-East Asia Active Margin

Ershova

Stöckli

2021

Minerals

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“…In the eastern direction, the passive margin Omulevka terrane was in contact with the Rassokha terrane, where the Ordovician rocks consisted of clastic rocks interbedded with tuffs of basalt to andesite composition, and rare basalt flows marking the approximate location of the Amandykan island arc [11,65,68,69]. Recent SHRIMP U-Pb zircon dating of a small granite massif with an island arc-type chemical composition, yielded a 440 ± 2 Ma age of intrusion [70]. A granite intrusion that was close in age (445.7 ± 1.5 Ma, SHRIMP U-Pb zircon dating) was documented on the northwest margin of the Okhotsk massif (Figure 14) [71].…”

Section: Tectonic Setting and Magma Source Of The Suordakh Event Intr...mentioning

confidence: 99%

Late Ordovician Mafic Magmatic Event, Southeast Siberia: Tectonic Implications, LIP Interpretation, and Potential Link with a Mass Extinction

et al. 2020

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A geochronological, isotopic, and geochemical study of the Suordakh event of mafic magmatic intrusions on the southeast Siberian margin was undertaken. U-Pb baddeleyite dating of a mafic sill intruding lower Cambrian rocks, yielded a 458 ± 13 Ma emplacement age. The chemical composition and stratigraphic setting of this dated sill differed from that previously attributed to the Suordakh event, implying that additional intrusions, previously mapped as Devonian, potentially belonged to the Suordakh event. No correlation between L.O.I. and concentration of highly mobile major and trace elements was documented, showing small or no influence of hydrothermal alteration on the chemical composition of the intrusions. A new tectonic reconstruction located an island arc and active margin relatively close to the study area. However, all samples had chemical compositions close to that of OIB and did not display Ta-Nb and Ti-negative anomalies, nor other features typical for subduction-related magmatism. The major and trace element distribution was most characteristic of within-plate basalts with the mantle source composition being transitional from spinel to garnet lherzolite. Combining four U-Pb baddeleyite dates of mafic sills and dykes from southeast Siberia, the age of the Suordakh event was estimated at 454 ± 10 Ma. The area of the Suordakh event was at least 35,000–40,000 km2 (an estimate including sills previously interpreted as Devonian), and could be increased with additional dating in Southeastern Siberia. Similar ages for within-plate intrusions were reported from South Korea, West Mongolia, South Argentina, North Iran and Northwest Canada, and these ca. 450 Ma ages were collectively close in timing with the latest Ordovician (Hirnantian) mass extinction. More high-precision dating is necessary to fully test a link between the Suordakh event (and the other age-correlative events) and the end-Ordovician mass extinction.

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