Late Mesozoic and Cenozoic volcanism of the East Sikhote-Alin area (Russian Far East): A new synthesis of geological and petrological data

2017 ◽  
Vol 47 ◽  
pp. 358-371 ◽  
Author(s):  
Yurii A. Martynov ◽  
Alexander I. Khanchuk ◽  
Andrei V. Grebennikov ◽  
Alexander A. Chashchin ◽  
Vladimir K. Popov
2015 ◽  
Vol 9 (6) ◽  
pp. 411-427 ◽  
Author(s):  
V. G. Gonevchuk ◽  
A. I. Khanchuk ◽  
G. A. Gonevchuk ◽  
V. A. Lebedev

Author(s):  
L. А. Fedina ◽  
◽  
О. L. Burundukova ◽  

Wild ginseng Panax ginseng C. A. Mey. (Araliaceae) is a rare medicinal plant. The aim of this work is to assess the state of ginseng cenopopulations in the Ussuriysky State Nature Reserve, and to search of indicator species of its optimal habitats. The reserve is located on the southern spurs of the Sikhote-Alin ridge in the basins of the Artyomovka and Komarovka rivers. In the course of route studies in the period from 2012 to 2019, phenological observations, description of habitats, determination of the age status and morphometry of 77 plants found in 8 types of forest were carried out. A large part of the finds belong to the cedar forests hornbeam – 44.4 %. Analysis of the species composition of the immediate environment of the relic, performed on 36-meter sites, revealed 41 species of vascular plants. Based on the generalized analysis of author's and literature data, a list of 7 species–indicators of optimal habitats for ginseng reintroduction was selected: Oxalis acetosella, Phryma asiatica, Hylomecon vernalis, Thalictrum filamentosum, Maianthemum bifolium, Galium davuricum, Carex ussuriensis. The number and composition of associated species varies depending on the type of forest. Long-term observations carried out in the reserve have revealed significant changes in the phenology of P. ginseng. In recent years, there has been a shift in the beginning of the growing season, flowering and ripening of fruits to earlier dates. Modern findings of ginseng in atypical habitats are described, indicating a broader ecological amplitude of its growth than was indicated by the first researchers. The age composition of the population is normal, but incomplete, there are no senile, very few mature generative plants, the rise falls on the group of medium-generative plants. In order to construct a vitality spectrum, plants from the most numerous age group in the generative middle-aged state g2 (n = 22) are ranked according to stem height into three vitality classes: higher (> 55 cm), medium (35-55 cm) and lower (< 35 cm). Frequency distribution analysis revealed predominance plants of the higher and middle classes of vitality. The vital spectrum indicates the equilibrium state of the population. Good fruiting and renewal of ginseng indicates the preservation of the species in the protected area, and the compliance of modern conditions of natural habitats to its ecological optimum.


2019 ◽  
Vol 98 ◽  
pp. 07006
Author(s):  
George Chelnokov ◽  
Ivan Bragin ◽  
Natalia Kharitonova

Low-enthalpy thermal waters (30-50°C) of HCO3-Na and HCO3-SO4-Na types with nitrogen as a dominant associated gas discharge on the southern continental margin of the Russian Far East and traditionally are of great importance for recreation and balneology facilities. All studied thermal waters have meteoric origin and relate to Palaeocene granite intrusions. Based on the chemical characteristics and isotopic composition, thermal waters are divided onto “immature” thermal waters with a short residence time (3H=1.3±0.2TU), and “mature” thermal waters (3H=0.3±0.2TU) originated as a result of a longer evolution history (more than 60 years). The chemical composition of waters is largely determined by water-rock interactions, residence time and the local geothermal gradient.


Author(s):  
N. S. Probatova

Five new species of the family Poaceae are described from the Russian Far East: Agrostis czernjaginae Prob. (sect. Trichodium) (revealed chromosome number 2n = 42) from thermal springs of Kamchatka, Bromopsis kozhevnikovii Prob. (sect. Rhizomatosae) from high mountains of Dusse-Alin Range in the Khabarovsk Territory, Poa amurica Prob. (sect. Stenopoa) from Selemdzha River in the Amur Region, Koeleria dersu Prob. et Prokopenko (sect. Koeleria) from the eastern macroslope of Sikhote-Alin in the Primorye Territory, Agrostis × lapenkoi Prob. (probably, intersectional hybrid: A. giganteaRoth × A. clavata Trin.) from Ussuri River basin, also in the Primorye Territory.


2016 ◽  
Vol 25 (2) ◽  
pp. 314-317
Author(s):  
A.L. Lvovsky

A new species, Buvatina dubatolovi sp. nov., closely related to the East European B. iremella Junnilainen et Nupponen, 1999, is described from the Botchinskiy Nature Reserve (Sikhote-Alin Range) at the Russian Far East.


2019 ◽  
Vol 98 ◽  
pp. 01025 ◽  
Author(s):  
Natalia Kharitonova ◽  
Georgy Chelnokov ◽  
Ivan Bragin ◽  
Hitomi Nakamura ◽  
Hikaru Iwamori ◽  
...  

Two types of cold CO2 rich groundwaters are located within the northern part of the Sikhote-Alin ridge: the first type is a Ca–Mg–HCO3 water with low TDS content (≤ 1.7 g/l) and high concentrations of Fe2+, Mn2+, Ba2+, and SiO2, whilst the second type is a Na–HCO3 water with a high TDS content (≈ 14 g/l) and elevated concentrations of Li+, Btot, Sr2+, Br–, and I–. A notable feature of these waters is a predominance of CO2 in the gas phase (up to 99 vol. %) and low contents of other gases (CH4, N2, O2, etc.). The origins of both water types can be identified on the basis of water (δD, δ18O) and gas (δ13C, 3He/4He, 4He/20Ne) isotopic compositions considered in the context of the geology and hydrology of the region.


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