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Том 33, 6, 2014 |
| Y.D. Zakharov, L.G. Bondarenko, A.M. Popov.
Lower Triassic stratigraphic units of South Primorye.
Paper 1. First findings of ammonoids of the genus Churkites
at the Ussuri Gulf coast 3 E.P. Razvozjaeva, G.L. Kirillova, P.N. Prokhorova. Comparative analysis of the fragments of the Mesozoic continental margin of East Asia: the Kyndal depression, Bureya Basin, Russia, and the Suibin depression, Sangjiang Basin, China 16 V.A. Simonov, V.S. Prikhodko, S.V. Kovyazin, A.V. Kotlyarov. Petrogenesis of meymechites from Sikhote-Alin from melt inclusions 34 V.B. Kaplun. Geoelectrical sections of the northwestern boundary of the Middle Amur sedimentary basin, the Far East, from data of magnetotelluric soundings 50 M.N. Luneva, V.V. Pupatenko. Splitting of ScS and S shear waves from a deep focus Okhotsk earthquake, 2013.05.24, Mw8.4, and its strong aftershocks 63 P.M. Anderson, A.V. Lozhkin, P.S. Minuyk, A.Yu. Pakhomov. Environmental changes of the Okhotsk-Kolyma divide from glacial lake sediments during the Holocene 70 V.T. S’edin, Yu.I. Melnichenko. Shirotny fault of the Philippine Sea – Structural peculiarities and evolution 81 G.A. Chelnokov, E.G. Kalitina, I.V. Bragin, N.A. Kharitonova. Hydrochemistry and genesis of thermal waters Goriachiy Kliuch, Primorye 99 M.V. Shaldybin, O.K. Kirilyuk, A.V. Dembovetsky, Yu.M.Lopushnyak, N.S. Konovalova, E.V. Utkina, G.V. Kharitonova. Mineralogical composition of Daurian Baer mounds soils 111 Jubilees Didenko А. N. 127 Obituaries Sorikina A.T. (1932–2014) 129 Index of paperspublished in 2014 г. 130 Y.D. Zakharov, L.G. Bondarenko, A.M. Popov Lower Triassic stratigraphic units of South Primorye. Paper 1. First findings of ammonoids of the genus Churkites at the Ussuri Gulf coast Ammonoids of the genus Churkites, typical representative of the early Olenekian assemblage (Anasibirites nevolini Zone), have been discovered in the upper part of the Tri Kamnya Cape section at the western coast of the Ussuri Gulf in South Primorye for the first time. Churkites cf. syaskoi Zakh. et Shig. was found there in association with ammonoids Inyoites, Clypeoceras, Owenites, Juvenites, Prionites, Glyptophiceras, Brayardites, Mianwaliites, Pseudoflemingites, Aspenites, Rohillites, Pseudoaspedites, Anaxenaspis, Anasibirites, Monneticeras?, Shamaraites, Palaeokazakhstanites, Xenoceltites and Arctoceras, most of which are known from the SMID (Artyom) section, where the Anasibirites nevolini Zone has been investigated in detail. In the quarry of the village of Smolyaninovo, a type locality of the Churkites syaskoi, the latter was found in association with Clypeoceras, Juvenites, Mianwaliites, Prionitidae gen. et sp. indet., and, also, Preflorianites? and Hanielites?. The ammonoids from the Smithian Substage of the Olenekian Stage of the Ungun (Khabarovsk area) and Perevalnyj (South Primorye) sections have been revised. Key words: Lower Triassic, Olenekian Stage, ammonoids, conodonts, South Primorye. E.P. Razvozjaeva, G.L. Kirillova, P.N. Prokhorova Comparative analysis of the fragments of the Mesozoic continental margin of East Asia: the Kyndal depression, Bureya Basin, Russia, and the Suibin depression, Sangjiang Basin, China Two fragments of the Late Mesozoic continental margin – the Kyndal depression in Russia and Suibin Basin in China were correlated on the basis of modern geological-geophysical evidence. Seismostratigraphic models and sedimentation history of the basins are presented and similarities and differences between them are shown. Common features reflect global records on the East Asian margin. A thick coal-bearing, mostly terrigenous series, accumulated in both depression which are promising for hydrocarbon discoveries. It was inferred that conditions for hydrocarbon preservation in the Kyndal depression appear to be better, as compared to the Suibin depression. Key words: continental margin, tectono-stratigraphic unit, megasequence, seismic profile, reflecting horizon, seismofacies, back-stripping analysis, East Asia. V.A. Simonov, V.S. Prikhodko, S.V. Kovyazin, A.V. Kotlyarov Petrogenesis of meymechites from Sikhote-Alin from melt inclusions New information on the physical-chemical conditions of the petrogenesis of meymechites from Sikhote-Alin has been obtained from studying the composition of minerals and melt inclusions. The data on the composition of minerals of subvolcanic and ultrabasic rocks from two localities (the Anyui and Katen river basins) indicate the similarity of the meymechites under study with standard rocks of the Maimecha-Kotui province and their formation in the intraplate conditions. Experiments carried out with melt inclusions in olivines and also calculation modeling based on the compositions of glass impurities reveal slight differences in temperature regimes of the magmatic systems which formed meymechites from the localities along the Anyui river (1235–1280º C) and Katen river (1230–1300 ºC). The olivine inclusions were studied and it was shown that crystallization of meymechites from Sikhote-Alin originated from basaltic melts, the chemical composition of which is identical to olivine basalts and picrobasalts, as a result of olivine cumulation. Data on the specific distribution features of titanium, rare and rare earth elements in the melt inclusions testify that plume magmatic systems took an active part in the formation of the meymechite complexes in Sikhote-Alin. A direct analysis with ion probe of the content of the volatile components in the glasses of heated melt inclusions in olivines revealed substantial differences in the water content in the magmatic systems forming meymechites of the Anyui (0.82–0.9 wt % up to 2.45 wt%) and Katen (0.22–0.30 wt %) river basins. Key words: melt inclusions, petrogenesis, meymechites, Sikhote-Alin. V.B.
Kaplun
Geoelectrical sections of the northwestern boundary of the Middle Amur sedimentary basin (the Far East) from data of magnetotelluric soundings Based on the data of magnetotelluric soundings (MTS), carried out at the northwestern boundary of the Middle Amur sedimentary basin (MASB), the geoelectrical sections were constructed down to 3 and 6 km depths along three profiles across the strike of the basin. Using the results of MTS data interpretation and involving the data of seismic methods including method of converted waves of earthquakes (MCWE) and common midpoint method (CMP); electrical prospecting methods including vertical electrical sounding (VES) and differential-normalized electrical prospecting (DNEP), and, also, using drilling data, the comprehensive geological-geophysical sections have been constructed. As a result, the structure of the sedimentary cover and the basement has been visualized and the anomalous areas have been distinguished; their electrical properties have been determined. Key words: magnetotelluric sounding, deep structure, Middle Amur sedimentary basin, Far East. M.N.
Luneva, V.V. Pupatenko
Splitting of ScS and S shear waves from a deep focus Okhotsk earthquake, 2013.05.24, Mw8.4, and its strong aftershocks Splitting parameters of ScS and S waves from the strong Okhotsk earthquake (Mw8.4) and largest aftershocks from a mantle transition zone in the backarc area of the Kamchatka subduction zone were measured. The results obtained show that fast azimuths of ScS waves dominate in eastern directions (110–149º), normal to the trench strike, and time delay between split shear ScS waves (δt) in the range of 0.9–1.6 sec. The azimuth of the fast S wave from the Okhotsk earthquake is eastward-directed (89°), and the time delay of the waves is as much as 2.5 sec. From the aftershocks, the azimuths of the fast S wave are parallel to the trench strike, δt are estimated at 1.2–1.3 sec. Fast azimuth patterns of ScS and S waves are consistent with the transverse isotropic symmetry of the medium with the symmetry axis oriented along the slab dip and with the inclined symmetry axis oriented parallel to the trench strike, respectively. Key words: seismic anisotropy, shear wave splitting, ScS, and local S waves, deep focus earthquakes, Kamchatka subduction zone. P.M. Anderson, A.V. Lozhkin, P.S. Minuyk, A.Yu. Pakhomov Environmental changes of the Okhotsk-Kolyma divide from glacial lake sediments during the Holocene Investigations of glacial lake sediments, located near the modern altitudinal boundary of larch forest (between 750–810 m absolute elevation), reveal continuous records of vegetation and climate changes over the last 12,000 years in the area of the Okhotsk-Kolyma divide. For the first time, pollen accumulation rates (PAR), which are suggestive of pollen productivity, were used as a key indicator to interpret the response of alpine plant communities to climate changes. The palynological data imply that several treeline fluctuations of ~100–200 m occurred during the Holocene. A belt of tundra, dominated by shrub pine, was first established beyond the alpine treeline near 7650 ± 50 BP. The abrupt appearance of the shrub pine in the study area is characteristic of a sharp vegetation boundary found in other records from the north of the Far East that corresponds to the Boreal-Atlantic boundary of the Holocene. The birch pollen zone, which occurs in the earlier portions of the records, is characteristic of the transition from the Pleistocene to the Holocene. Key words: Pleistocene, Holocene, pollen zone, Alpine treeline, NE Russia. V.T. S’edin, Yu.I. Melnichenko Shirotny fault of the Philippine Sea – Structural peculiarities and evolution Topographical and geological structural peculiarities allow an establishing of an extensive linear zone of tectonically dissected relief in the deep-water part of the Philippine Sea, which is marked by a chain of local depressions and associated block uplifts. It is located in the southern West Philippine troughs stretching in sublatitudinal direction almost along 13° N from the Philippine trench in the west and up to Kyushu-Palau Range in the east. The structural position, topographical features of its components along with geological structure permit this structure to be referred to as a tectonic zone earlier being called by the authors Shirotny fault. It was most probably formed in the Late Mesozoic time in the abyssal part of the Pacific Ocean. Active tectonic processes within its limits resumed in the Middle Paleogene and completed by Late Eocene. They probably were not followed by active magmatism. In the Late Eocene time, there commenced processes of normal deep-water sedimentation. The Shirotny fault is a structure genetically related to other linear tectonic zones of the Philippine Sea (Central and Yap faults, Okinawa-Luson fault zone). Key words: topography, geological structure, Shirotny fault, Philippine Sea. G.A. Chelnokov, E.G. Kalitina, I.V. Bragin, N.A. Kharitonova Hydrochemistry and genesis of thermal waters Goriachiy Kliuch, Primorye (Far East of Russia) The paper presents original data on hydrochemical, microbiological and isotope composition of the nitric thermal waters Goriachiy Kliuch (Primorye). A year-round study was first made of the thermal water state and environmental conditions that revealed that underground waters heated over 300C in fractured siliceous rocks of the Upper Permian, don't undergo considerable seasonal fluctuations of temperature and discharge during the year, and minor seasonal changes of a chemical composition result from water-rock-organic interaction. Isotope investigations (δ18О, δ2Н and 3H) indicate the atmospheric origin of the thermal waters and a long period of circulation over 50 years. When readily slacking rocks and aggressive gases are absent, transport of elements into water delayed causing a low mineralization of waters. The temperature of thermal waters depends on the depth of their circulation that is about 1-2 km. The processes of a cycle carbon and nitrogen were found to be most active in the thermal waters with participation of microorganisms. Key words: nitric thermal waters, genesis, fluorine, isotopes, Primorye, Far East of Russia. M.V. Shaldybin, O.K. Kirilyuk, A.V. Dembovetsky, Yu.M.Lopushnyak, N.S. Konovalova, E.V. Utkina, G.V. Kharitonova Mineralogical composition of Daurian Baer mounds soils The mineralogical composition and particle-size distribution of Daurian Baer mounds soils (South Transbaikal Region, Amur River basin) were studied by the methods of X-ray and laser diffractometry, scanning electron microscopy, and energy-dispersive analysis. Both similarities and differences in the composition of the Baer mounds soils of the Daurian and Caspian regions were recognized. The soils are characterized by coarse texture and close differential distribution of individual fractions. The mineralogical composition of soils is based on such framework minerals as quartz and feldspars. It is shown that the Daurian Baer mounds soils differ from those of the Caspian region in the insignificant content of fine-dispersed fractions, absence of essential features of salinization, and lesser microaggregation. Their lesser microaggregation determines the essentially lesser erosional stability of soils and Daurian Baer mounds, and, consequently, the formation of deflation basins in the mounds. Key words: X-ray and laser diffractometry, soils, Baer mounds, Amur River basin. |