The composition and age of the Ul’ya flora (Okhotsk-Chukotka volcanic belt, North-East of Russia): paleobotanical and geochronological constraints

Abstract The Ul’ya flora comes from the Amka Formation of the Ul’ya Depression, located in the Okhotsk–Chukotka volcanic belt (North-East Russia). This flora includes ~50 species, among which conifers predominate. Ferns and angiosperms are also diverse. The Ul’ya flora is characterized by high endemism and by the presence of numerous Early Cretaceous relicts (Hausmannia, Podozamites, Phoenicopsis, Baiera, Sphenobaiera). Four new endemic species of conifers from the Ul’ya flora are described: Elatocladus amkensis Golovneva, sp. nov., Araucarites sheikashoviae Golovneva, sp. nov., Elatocladus gyrbykensis Golovneva, sp. nov. and Pagiophyllum umitbaevii Golovneva, sp. nov. Two-lobed leaves of Sphenobaiera are assigned to S. biloba Prynada based on their epidermal structure. Because of its systematic composition the Ul’ya flora is correlated with the Coniacian Chaun flora of Central Chukotka, with the Coniacian Aliki flora from the Viliga–Tumany interfluve area, and with the Coniacian Kholchan flora of the Magadan Region. The U-Pb age of zircon (ID-TIMS method) from plant-bearing tuffites within the Amka Formation at the Uenma River is 86.1 ± 0.3 Ma. Thus, Coniacian age (most likely the end of the Coniacian, near the Coniacian/Santonian boundary) is assigned to the Ul’ya flora and plant-bearing pyroclastic deposits of the Amka Formation on the basis of paleobotanical and isotopic data.

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The Chingandzha flora of the Okhotsk-Chukotka volcanic belt

Palaeobotany ◽

10.31111/palaeobotany/2019.10.13 ◽

2019 ◽

Vol 10 ◽

pp. 13-179

Author(s):

L. B. Golovneva

Keyword(s):

River Basin ◽

Volcanic Belt ◽

Flowering Plants ◽

Sedimentary Deposits ◽

North East ◽

The North ◽

Magadan Region ◽

Chukotka Volcanic Belt ◽

Systematic Composition ◽

Coastal Lowlands

The Chingandzha flora comes from the volcanic-sedimentary deposits of the Chingandzha Formation (the Okhotsk-Chukotka volcanic belt, North-East of Russia). The main localities of the Chingandzha flora are situated in the Omsukchan district of the Magadan Region: on the Tap River (basin of the middle course of the Viliga River), on the Kananyga River, near the mouth of the Rond Creek, and in the middle reaches of the Chingandzha River (basin of the Tumany River). The Chingandzha flora includes 23 genera and 33 species. Two new species (Taxodium viligense Golovn. and Cupressinocladus shelikhovii Golovn.) are described, and two new combinations (Arctopteris ochotica (Samyl.) Golovn. and Dalembia kryshtofovichii (Samyl.) Golovn.) are created. The Chingandzha flora consists of liverworts, horsetails, ferns, seed ferns, ginkgoaleans, conifers, and angiosperms. The main genera are Arctop teris, Osmunda, Coniopteris, Cladophlebis, Ginkgo, Sagenoptepis, Sequoia, Taxodium, Metasequoia, Cupressinocladus, Protophyllocladus, Pseudoprotophyllum, Trochodendroides, Dalembia, Menispermites, Araliaephyllum, Quereuxia. The Chingandzha flora is distinct from other floras of the Okhotsk-Chukotka volcanic belt (OCVB) in predominance of flowering plants and in absence of the Early Cretaceous relicts such as Podozamites, Phoenicopsis and cycadophytes. According to its systematic composition and palaeoecological features, the Chingandzha flora is similar to the Coniacian Kaivayam and Tylpegyrgynay floras of the North-East of Russia, which were distributed at coastal lowlands east of the mountain ridges of the OCVB. Therefore, the age of the Chingandzha flora is determined as the Coniacian. This flora is assigned to the Kaivayam phase of the flora evolution and to the Anadyr Province of the Siberian-Canadian floristic realm. The Chingandzha flora is correlated with the Coniacian Aleeky flora from the Viliga-Tumany interfluve area and with other Coniacian floras of the OCVB: the Chaun flora of the Central Chukotka, the Kholchan flora of the Magadan Region and the Ul’ya flora of the Ul’ya Depression.

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The distribution of Sphenobaiera biloba Prynada in the Cretaceous of Northeastern Asia

Palaeobotany ◽

10.31111/palaeobotany/2018.9.18 ◽

2018 ◽

Vol 9 ◽

pp. 18-31

Author(s):

N. V. Nosova ◽

L. B. Golovneva

Keyword(s):

River Basin ◽

Volcanic Belt ◽

Northeastern Russia ◽

Eastern Siberia ◽

Northeastern Asia ◽

Epidermal Structure ◽

Northern Asia ◽

Lena River ◽

Chukotka Volcanic Belt ◽

Volcanogenic Deposits

A revision of Sphenobaiera biloba Prynada from Northeastern Asia is based on restudy of the type material from the Zyryanka River Basin (Prynada’s collection), as well as additional specimens from the type locality (Samylina’s collection) and collections from the Ul’ya and Anadyr rivers. A new extended diagnosis of S. biloba based on the leaf morphology and epidermal structure is proposed. Geographic and stratigraphic distribution of this species in Northern Asia is discussed. S. bilobais known in the Aptian of Eastern Siberia (Lena River Basin) and from the early-middle Albian to Coniacian of northeastern Russia. In the Late Cretaceous this species was considered as relict and related with volcanogenic deposits of the Okhotsk-Chukotka volcanic belt.

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Systematic composition and evolutionary significance of floristic assemblage of the Toptan Formation (Lower Cretaceous, North-East of Russia)

Palaeobotany ◽

10.31111/palaeobotany/2017.8.28 ◽

2017 ◽

Vol 8 ◽

pp. 28-44 ◽

Cited By ~ 2

Author(s):

L. B. Golovneva ◽

S. V. Shczepetov ◽

A. E. Livach

Keyword(s):

Main Part ◽

Floral Development ◽

Floristic Composition ◽

Flowering Plants ◽

Evolutionary Significance ◽

North East ◽

The North ◽

Magadan Region ◽

Plant Remains ◽

Systematic Composition

The analysis of the distribution of plant remains in deposits of the Aigur and Toptan formations (Omsukchan district of the Magadan Region) showed that the main part of the species that were included in the Toptan stratoflora (Samylina, 1976), in fact come from the Aigur Formation. Floristic assemblages of the Aigur and Toptan formations are very similar in systematic composition. Increasing the diversity of flowering plants and reduction of typical Cretaceous taxa (cycadophytes and Ginkgoales was not indicated on the boundary between these formation. Thus, there is no evidence of significant changes in the floristic composition at this stratigraphic level and the existence of independent Toptanian stage in the evolution of the mid-Cretaceous flora of the North-East of Russia. Floristic assemblages from the Galimyi, Aigur and Toptan formations are proposed to be merged into a single Sugoi flora, which should be attributed to the Buor-Kemus stage of floral development (lower-middle Albian). The description of the lectostratotype of the Toptan Formation is first published and distribution of this formation is illustrated.

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Geochronology and thermochronology of Cretaceous plutons and metamorphic country rocks, Anyui-Chukotka fold belt, North East Arctic Russia

Stephan Mueller Special Publication Series ◽

10.5194/smsps-4-157-2009 ◽

2009 ◽

Vol 4 ◽

pp. 157-175 ◽

Cited By ~ 16

Author(s):

E. L. Miller ◽

S. M. Katkov ◽

A. Strickland ◽

J. Toro ◽

V. V. Akinin ◽

...

Keyword(s):

Volcanic Rocks ◽

Volcanic Belt ◽

High Heat ◽

White Mica ◽

The Arctic ◽

Second Phase ◽

Quartz Veins ◽

North East ◽

Chukotka Volcanic Belt ◽

Uplift And Erosion

Abstract. U-Pb isotopic dating of seven granitoid plutons and associated intrusions from the Bilibino region (Arctic Chukotka, Russia) was carried out using the SHRIMP-RG. The crystallization ages of these granitoids, which range from approximately 116.9±2.5 to 108.5±2.7 Ma, bracket two regionally significant deformational events. The plutons cut folds, steep foliations and thrust-related structures related to sub-horizontal shortening at lower greenschist facies conditions (D1), believed to be the result of the collision of the Arctic Alaska-Chukotka microplate with Eurasia along the South Anyui Zone (SAZ). Deformation began in the Late Jurassic, based on fossil ages of syn-orogenic clastic strata, and involves strata as young as early Cretaceous (Valanginian) north of Bilibino and as young as Hauterivian-Barremian, in the SAZ. The second phase of deformation (D2) is developed across a broad region around and to the east of the Lupveem batholith of the Alarmaut massif and is interpreted to be coeval with magmatism. D2 formed gently-dipping, high-strain foliations (S2). Growth of biotite, muscovite and actinolite define S2 adjacent to the batholith, while chlorite and white mica define S2 away from the batholith. Sillimanite (± andalusite) at the southeastern edge the Lupveem batholith represent the highest grade metamorphic minerals associated with D2. D2 is interpreted to have developed during regional extension and crustal thinning. Extension directions as measured by stretching lineations, quartz veins, boudinaged quartz veins is NE-SW to NW-SE. Mapped dikes associated with the plutons trend mostly NW-SE and indicate NE-SW directed extension. 40Ar/39Ar ages from S2 micas range from 109.3±1.2 to 103.0±1.8 Ma and are interpreted as post-crystallization cooling ages following a protracted period of magmatism and high heat flow. Regional uplift and erosion of many kilometers of cover produced a subdued erosional surface prior to the eruption of volcanic rocks of the Okhotsk-Chukotka volcanic belt (OCVB) whose basal units (~87 Ma) overlie this profound regional unconformity. A single fission track age on apatite from granite in the Alarmaut massif yielded an age of 90±11 Ma, in good agreement with this inference.

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The diachronous formation of the Enmyvaam and Amguema-Kanchalan volcanic fields in the Okhotsk-Chukotka volcanic belt (NE Russia): Evidence from isotopic data

Doklady Earth Sciences ◽

10.1134/s1028334x10090072 ◽

2010 ◽

Vol 434 (1) ◽

pp. 1172-1178 ◽

Cited By ~ 7

Author(s):

V. G. Sakhno ◽

V. F. Polin ◽

V. V. Akinin ◽

S. A. Sergeev ◽

A. A. Alenicheva ◽

...

Keyword(s):

Volcanic Belt ◽

Isotopic Data ◽

Volcanic Fields ◽

Chukotka Volcanic Belt ◽

Ne Russia

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Mineralogy of the Svetloye epithermal district, Okhotsk-Chukotka volcanic belt, and its insights for exploration

Ore Geology Reviews ◽

10.1016/j.oregeorev.2021.104257 ◽

2021 ◽

pp. 104257

Author(s):

Tamara Yu. Yakich ◽

Yury S. Ananyev ◽

Alexey S. Ruban ◽

Roman Yu. Gavrilov ◽

Dmitry V. Lesnyak ◽

...

Keyword(s):

Volcanic Belt ◽

Chukotka Volcanic Belt

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EVALUATION OF THE IMPACT OF ENVIRONMENTAL CONDITIONS ON THE STATUS OF THE BODY OF YOUNG PEOPLE OF 17-19 YEARS OF DIFFERENT ETHNIC GROUPS OF THE NORTH-EAST RUSSIA

Hygiene and Sanitation ◽

10.18821/0016-9900-2017-96-8-766-769 ◽

2019 ◽

Vol 96 (8) ◽

pp. 766-769 ◽

Cited By ~ 1

Author(s):

Inessa V. Averyanova ◽

S. I. Vdovenko ◽

A. L. Maksimov

Keyword(s):

Gas Exchange ◽

Climatic Conditions ◽

The Body ◽

External Respiration ◽

Adaptive Responses ◽

Northeast Russia ◽

North East ◽

The North ◽

Magadan Region ◽

The Impact

Natural and climatic conditions of the environment of Northeast Russia and particularly Magadan region are the very factor mostly influencing adaptive responses by individuals inhabiting the region. Compensatory and adaptive responses in indigenes and newcomers of the region can be assumed to have their specific features. In 2009 there was executed the examination of the cardiovascular and respiratory systems and gas exchange in 392 cases aged of 17-19 years, including Europeans (Caucasians) born in the North in the 1st-2nd generation and indigenes. The methodologically similar study was carried out in 2014 in 265 persons, referred to the same cohorts of North-born Caucasians and Indigenes from the Magadan region. The results of the study executed in 2009 testified to a small number of physiological parameters that were reliably different in Caucasians vs. Indigene subjects. In 2014 no difference was found between the two examined cohorts throughout the observed parameters. The revealed changes in gas exchange, external respiration and cardiovascular systems demonstrated by modern young Indigenes of Northeast Russia testified to the fall in the effectiveness of their breathing. All that makes them farther from the classic “polar metabolic type” and their morphofunctional status becomes closer to European male subjects of Northeast Russia. Thus, we can observe a clear tendency towards “convergence in programs” of the adaptive changes between populations of the North residents undergoing similar natural, environmental and social factors.

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Золотая минерализация штокового рудного поля (Магаданская область)

Bulletin of the North-East Science Center ◽

10.34078/1814-0998-2021-1-13-29 ◽

2021 ◽

pp. 13-29

Author(s):

A. N. Glukhov ◽

◽

M. I. Fomina ◽

E. E. Kolova ◽

◽

...

Keyword(s):

Volcanic Belt ◽

Rare Metal ◽

Geological Structure ◽

Physicochemical Conditions ◽

Epithermal Mineralization ◽

Ore Bodies ◽

Mineral Associations ◽

Rare Metal Mineralization ◽

Chukotka Volcanic Belt ◽

Formation Conditions

The authors briefly characterize the geology and structure of the Shtokovoye ore field attached to the area where the Khurchan-Orotukan zone of tectonic-magmatic activation overlays the structures of the Yana-Kolyma ore-bearing belt. Studied are mineral associations and physicochemical conditions of gold ore bodies, located both in granites and in hornfelsed sedimentary masses. By the main features of its geological structure, ore composition, and physicochemical formation conditions, the Shtokovoye ore field mineralization corresponds to the "depth" group of the gold-rare-metal formation, analogous to the Butarnoye, Basugunyinskiye, Dubach, and Nadezhda occurrences. Its ores are peculiar in the late epithermal mineralization, which is associated with the Okhotsk-Chukotka volcanic belt and overlays the sinaccretional gold-rare-metal mineralization.

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