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This study provides SHRIMP-RG data on zircons from garnet gedritites, the products of retro-grade metamorphism of eclogite-like rocks constituting belonging to the basement of the Omolon Massif. The earliest episode recorded by oscillatory-zoned cores having high HREE and Ti contents occurred at 3.25–3.22 Ga (Paleoarchean) and is interpreted to rep...
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... least altered sample of eclogite-like rock from our collection with orthopyroxene-plagioclase rims constituting not more than 10 vol.% of the rock (sam- ple А339) is distinguished chemically on the TAS dia- gram (The Petrographic …, 2009) as an ultramafic picrobasalt (Table 1). Unlike the lavas with a respec- tive basicity, this rock has elevated Al 2 O 3 and CaO contents and lower Mg-number while the range of other parameters is similar to that of hornblendite (The Petrographic …, 2009, Table 6, p. 117). ...
Context 2
... the lavas with a respec- tive basicity, this rock has elevated Al 2 O 3 and CaO contents and lower Mg-number while the range of other parameters is similar to that of hornblendite (The Petrographic …, 2009, Table 6, p. 117). Com- pared to sample А339, the dated garnet gedritite (sam- ple 329a) has higher SiO 2 and K 2 O contents (Table 1) and plots at the interface of four fields (ultramafic picrobasalts, moderately alkaline picrobasalts, trachy- basalts, and basalts). The garnet gedritite has higher Al 2 O 3 and lower CaO contents than the eclogite-like rock. ...
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... This tectonic province represents the northeastern part of the 'Kolyma loop' (Figure 1). It is located between the South Anyui suture and the Omolon cratonic block, underlain by Archean crust (Akinin and Zhulanova 2016). On the east, the complexes of the Oloy province are unconformably overlain by volcanic rocks of the OCVB; its western part is concealed by Cenozoic sediments of the Kolyma Basin. ...
Across western and northern Chukotka, a region spanning 400 000 km2, we have defined three different tectono-magmatic systems that were active during the Aptian-Albian (123-100 Ma) time span: (1) the Tytylveem post-collisional belt (123-105 Ma); (2) the Chaun province of extension-related magmatism (109-100 Ma); and (3) the earliest eruptive units (106-100 Ma) of the subduction-related Okhotsk-Chukotka volcanic belt (OCVB). The observed tectono-magmatic systems are characterized by their location and by their different chemical and isotopic compositions. The general enrichment of magma sources successively increases from the OCVB to the Tytylveem belt and then to the Chaun province. While the Tytylveem belt was active, the volcanic loci shifted northwest along the strike of the belt, perhaps because of diachronous delamination of the lithosphere of the once present but extinct South Anyui ocean. On the scale of the entire region of NE Asia, the tectonic re-arrangement that controlled magmatism in the Early Cretaceous was marked by the extinction of major subduction zones on the periphery of the closing Oimyakon and South Anyui oceanic basins followed by magmatic events likely caused by lithospheric delamination and / or extension. Along the Pacific margin of Asia, subduction-related volcanism was nearly continuous during the entire Cretaceous.
... The distributions of the U-Pb and Pb-Pb ages of magmatic rocks from the Okhotsk and Prikolyma cratonic terranes are highly similar to those from the Siberian craton basement (Beus and Miledin, 1990;Beus, 1992;Khudoley et al., 2007;Kuzmin, 1993;Kuzmin et al., 1995;Prokopiev et al., 2009;and references therein). The available U-Pb ages from the basement of the Omolon cratonic terrane appear to be older than the Siberian craton provenance of 3850-3220 and 2700-1900 Ma (Akinin and Zhulanova, 2016;Shevchenko, 2006), but ages at ca. 1700 Ma are unknown. The peak at 1722 Ma is highly distinctive (33 %) in metasandstone (sample 2003/06, Fig. 7). ...
... Some samples Fig. 10. Tectono-stratigraphic columns summarizing (a) the main provenance of detrital zircons (modified based on Sokolov and Byalobzhesky, 1996, Oxman, 1997, Shevchenko, 2006, Khanchuk, 2006, Khudoley et al., 2007, Prokopiev et al., 2009, Gagieva and Zhulanova, 2011, Akinin and Zhulanova, 2016, Goryachev et al., 2017, Prokopiev et al., 2019, Ledneva et al., 2019, Moiseev, 2020, and Ganelin et al., 2022, and (b) the relative age probability spectra for sandstones of Ust'-Belaya and the Algan terranes. The letter 'N' indicates the total number of reported concordant ages. ...
The West Koryak and Koryak fold-and-thrust belts (FTB) are typical accretionary orogens that formed during
subduction of the Paleo-Pacific plate beneath eastern Asia. The geological histories of the basins that formed
across supra-subduction volcanic belts remain poorly understood. To address this research gap, this study presents
the petrographic compositions and U-Pb ages of detrital zircons from Late Paleozoic –Campanian sandstones
and assessed the provenance and tectonic histories of the active margins in northeast Asia. The Tolovka
thrust sheet of Ust’-Belaya terrane is composed of sandstones of different ages and origin. The quartz arenites
were deposited in a passive margin environment in the Late Mesoproterozoic–Early Neoproterozoic (?) time. The
most likely provenances for detrital zircons were the eastern part of the Siberian craton. The maximum depositional
age of the lithic arenites is Middle Triassic. The source of zircons may constitute a coeval and Early
Carboniferous supra-subduction magmatic rock of the Koni-Taigonos volcanic belt. Berriasian-Valanginian volcaniclastics
of the Mavrina thrust sheet of Ust’-Belaya terrane formed in the forearc basin of the Uda-Murgal
volcanic belt. Early and Late Jurassic complexes were the main source for detrital zircons. Albian-Campanian
volcaniclastics of the Algan terrane were deposited in continental slope basins along the Okhotsk-Chukotka
convergent margin. A possible source for Precambrian-aged zircons was cratonic terranes of the Verkhoyansk-
Kolyma FTB. The Ediacaran–Early Cambrian detrital zircons were sourced from subducted-related complexes
of the West- Koryak FTB. The Carboniferous-Late Cretaceous detrital zircons were derived from a suprasubduction
of volcanic belts.
... For example, the Archean and Paleoproterozoic detrital zircons could derive from the Siberian Craton, the basement of which contain abundant rocks with similar ages [27]. Similar ages are also characteristic of rocks in the crystalline basement of the craton terranes: Okhotsk and Omolon blocks [1,14,15]. At the same time, the presence of well-rounded zircon grains indicates their redeposition from older terrigenous rocks, which could have a local origin. ...
... Akinin and Zhulanova (2016), 2)Avchenko and Chudnenko (2020), 3) Drachev (2016), 4) Kaparulina et al. (2016), 5) Konstaninovsky (2007), 6) Prokopiev et al. (2009), 7) Miller et al. (2009), 8) Katkov et al. (2007), 9) Filatova and Khain (2008), 10) Akinin and Miller (2011), 11) Belyi (1977), 12) Kabanova et al. (2011), 13) Tikhomirov et al. (2012), 14) Tschegg et al. (2011), 15) Naugler et al (1974), 16) Nikolaeva et al. (2013). ...
The Arctic's glacial history has classically been interpreted from marine records in terms of the fluctuations of the Eurasian and North American ice sheets. However, the existence, size, and timing of the East Siberian Ice Sheet (ESIS) remains highly uncertain. A recently discovered glacially scoured cross-shelf trough extending to the edge of the continental shelf north of the De Long Islands has provided additional evidence that glacial ice existed on parts of the East Siberian Sea (ESS) during previous glacial periods (MIS 6 and 4). This study concentrates on defining the mineralogical signature and dynamics of the ESIS. Sediment materials from the East Siberian shelf and slope were collected during the 2014 SWERUS-C3 expedition. The cores studied are 20-GC1 from the East Siberian shelf, 23-GC1 and 24-GC1 from the De Long Trough (DLT), and 29-GC1 from the southern Lomonosov Ridge (LR). Heavy mineral assemblages were used to identify prominent parent rocks in hinterland and other sediment source areas. The parent rocks areas include major eastern Siberian geological provinces such as the Omolon massif, the Chukotka Fold Belt, the Verkhoyansk Fold Belt, and possibly the Okhotsk–Chukotka Volcanic Belt. The primary riverine sources for the ESS sediments are the Indigirka and Kolyma rivers, which material then was glacially eroded and re-deposited in the DLT. The higher abundances of hornblendes in the heavy mineral assemblages may indicate ESS paleovalley of the Indigirka river as a major pathway of sediments, while the Kolyma river paleovalley pathway relates to a higher share of pyroxenes and epidote. Mineralogical signature in the DLT diamicts, consisting predominantly of amphiboles and pyroxenes with minor content of garnet and epidote, show clear delivery from the eastern sector of the ESIS. Although the physical properties of the DLT basal diamict closely resemble a pervasive diamict unit recovered across the southern LR, their source material is slightly different according to their heavy mineral content. Assemblages with elevated amphibole and garnet content, along with higher titanite and ilmenite content from core 29-GC1 from the southern LR emphasise the Verkhoyansk Fold Belt as a possible source. This suggests that glacial ice not only grew out from the East Siberian shelf, but also from the New Siberian Islands and westerly sources due to the dynamics in the ice flow and deposition. An increase in the iron oxides in the sediments overlying the diamicts relates to the deglaciation cycle of the ESIS when the central plateau, or at least the shoreline and river discharge region, were possibly free from ice, and the reworking as well as enrichment of iron oxides was possible. This indicates sea-ice rather than iceberg transport for the present distal shelf sediments.
... The Prikolyma Terrane is composed of intensely deformed Paleoproterozoic to Carboniferous rocks, overlain by less deformed Permian and Mesozoic clastic and volcaniclastic rocks (e.g., [5,8,[21][22][23][24]). The Omolon Terrane comprises Archean to Paleoproterozoic metamorphic basement (e.g., [25,26]), unconformably overlain by Mesoproterozoic to Ordovician clastic and carbonate rocks. 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]. ...
... Precambrian zircons are not abundant, represent a subsidary component of the zircon population (<28−10%) (Figure 8), and cluster predominantly between 1800-2000 and 2500-2800 Ma. Metamorphic complexes in the basement of the Omolon Terrane, located to the north-east of the Sugoi synclinorium, represent a possible source for the Archean and Paleoproterozoic zircons (e.g., [26,108,109]) (Figures 2 and 3). Zircons of these ages could also be sourced from the southern part of the Prikolyma Terrane, based on comparable derital ...
... Precambrian zircons are not abundant, represent a subsidary component of the zircon population (<28−10%) (Figure 8), and cluster predominantly between 1800-2000 and 2500-2800 Ma. Metamorphic complexes in the basement of the Omolon Terrane, located to the north-east of the Sugoi synclinorium, represent a possible source for the Archean and Paleoproterozoic zircons (e.g., [26,108,109]) (Figures 2 and 3). 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]. ...
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.
... Their relation to the basement of an ancient continent or block can be estimated from comparison of ages of xenogenic zircons with the main tectonomagmatic events within the Siberian Continent and Omolon Terrane (Fig. 14c). The U-Pb ages of the basement [22]; (9) U-Pb ages of clastic zircon grains; (10-12) ages of metamorphic event: (10) Ar-Ar method [18]; (11) Ar-Ar method [12]; (12) K-Ar method [24]; (13) amount of zircon grains taken into account; (14,15) density curves of distribution of U-Pb ages and their maxima; N, amount of grains taken into account: (14) accessory xenogenic zircons from igneous rocks [6,24,25], (15) clastic zircons from sandstone blocks in mélange of Eonaivaam River [15]; (16,17) ranges of ages of main tectonic events: (16) Siberian Craton [43], (17) of the Omolon Block [1] are inconsistent with the maxima of density distribution curve for xenogenic zircons. Their age is similar to the stages of tectonomagmatic events typical of the Siberian Craton [43] in the ranges of 1900-2100 and 2700-2800 Ma. ...
Vendian and Permian–Triassic plagiogranite magmatism is distinguished for the Ust-Belsky and Algansky terranes of West Koryak fold system. The U‒Pb zircon ages from Vendian and Permian–Triassic plagiogranites are 556 ± 3 Ma (SIMS), 538 ± 7 Ma (LA–ICP–MS) and 235 ± 2 Ma (SIMS), respectively. It is revealed that Vendian and Permian–Triassic plagiogranites are mainly low-K and low-Al. Sr‒Nd isotopy and rare earth element patterns make it possible to suggest their formation as partial melting of primarily mantle substrate or fractional crystallization of the basic magma. Vendian plagiogranites formed within active margin in ensimatic island arc simultaneously with deposition of the lower part of the volcano-sedimentary complex of Otrozhninskaya sheet. We suggest that the Permian–Triassic plagiogranites were formed within the limits of the Ust-Belsky segment of the Koni-Taigonos arc during partial melting of melanocratic ophiolite material built up as fragments in the accretionary structure of that arc or by fractional crystallization of basic magmas melted from a similar substrate.
... The narrow range of Precambrian ages (c. 1.9-1.7 Ga) corresponds to the ages of the Precambrian basement of the cratonal part of the Omolon terrane (Parfenov 1991;Nokleberg et al. 1994;Akinin & Zhulanova 2016). ...
This paper synthesizes the framework and geologic evolution of the Arctic-Alaska–Chukotka microplate (AACM) from its origin as part of the continental platform fringing Baltica and Laurentia, to its southward motion during formation of the Amerasia Basin (Arctic Ocean) and its progressive modification as part of the dynamic northern paleo-Pacific margin. A synthesis of data refines the crustal identity, limits, and history of the AACM, which, together with regional geologic constraints, provides a tectonic framework to aid in its pre-Cretaceous restoration. Recently published seismic reflection data and interpretations, integrated with regional geologic constraints, provide the basis for a new crustal transect (CALE Transect C) linking the Amerasia Basin and the Pacific margin along two paths that span 5100 km from the Lomonosov Ridge (near the North Pole), across the Amerasia Basin, Chukchi Sea and Bering Sea, ending at the subducting Pacific plate margin in the Aleutian Islands. We propose a new plate tectonic model in which the AACM originated as part of a re-entrant in the paleo-Pacific margin and moved to its present position during slab-related magmatism and southward retreat of paleo-Pacific subduction, largely coeval with the rifting and formation of the Amerasia Basin in its wake.
... The composition of minerals and symbols are shown in Table 1. microgabbronorites of the Pekulney Ridge do not correspond to amphibole-two-pyroxene crystalline schists but to eclogite-like rocks: only for them typical is low silicic acid with high alumina and iron [47,49]. Under high general pressure, characteristic for Archean granulite complexes, such component ratio determines crystallization of garnet, a barophilic mineral rich in alumina and iron but silica-poor. ...
... Plagioclases and clinopyroxenes from the Pekulney Ridge rocks, described in [5][6][7] as Precambrian amphibole-two-pyroxene crystalline schists, contain melt inclusions, which is Note. These properties, including mineral compositions, refer to the amphibole-two-pyroxene crystalline schists from the Aulandzha Block of the Omolon Massif basement [49]. Their Paleoarchean age is conirmed by the latest results of U-Pb SHRIMP-RG dating of zircons [51]. ...
... The narrow range of Precambrian ages (c. 1.9-1.7 Ga) corresponds to the ages of the Precambrian basement of the cratonal part of the Omolon terrane (Parfenov 1991;Nokleberg et al. 1994;Akinin & Zhulanova 2016). ...
This paper synthesizes the framework and geological evolution of the Arctic Alaska-Chukotka microplate (AACM), from its origin as part of the continental platform fringing Baltica and Laurentia to its southward motion during the formation of the Amerasia Basin (Arctic Ocean) and its progressive modification as part of the dynamic northern palaeo-Pacific margin. A synthesis of the available data refines the crustal identity, limits and history of the AACM and, together with regional geological constraints, provides a tectonic framework to aid in its pre-Cretaceous restoration. Recently published seismic reflection data and interpretations, integrated with regional geological constraints, provide the basis for a new crustal transect (the Circum-Arctic Lithosphere Evolution ('CALE') Transect C) linking the Amerasia Basin and the Pacific margin along two paths that span 5100 km from the Lomonosov Ridge (near the North Pole), across the Amerasia Basin, Chukchi Sea and Bering Sea, and ending at the subducting Pacific plate margin in the Aleutian Islands. We propose a new plate tectonic model in which the AACM originated as part of a re-entrant in the palaeo-Pacific margin and moved to its present position during slab-related magmatism and the southward retreat of palaeo-Pacific subduction, largely coeval with the rifting and formation of the Amerasia Basin in its wake.
... The Omolon block has Precambrian sources with ages similar to the main peaks in this unit, namely 3.2 Ga (minor), 2.6 Ga, and 2.0-1.8 Ga (Akinin and Zhulanova, 2015). Thus, a Kolyma-Omolon source for the Late Jurassic-Early Cretaceous strata is possible. ...
