New data on the late holocene seismicity of the southwestern edge of the Baikal Rift Zone     

A. V. Panin 《Doklady Earth Sciences》2011,438(1):563-568

Three strong earthquakes that occurred since the end of 8th century have been identified by archeoseismic data in the southwestern part of the Tere Khol’ Depression. The dates for these events are the 9th, 12th, and first two-thirds of 19th century, and the average recurrence interval is 500 years. The relative seismic passivity of the Tere Khol’ Depression at present may be related to the relatively recent discharge of stress in seismogenerating sources.  相似文献   

Perspective targeting CuAuMo porphyries of Romanian Carpathians: blind porphyry mineralization and its variable distal expression as vein and skarns     

Serban Nicolae Vlad 《Central European Journal of Geosciences》2011,3(3):318-335

Romania has a genuine accumulation of “blind” porphyry CuAuMo systems associated with Cu skarns or AuAg (PbZn) epithermal vein sets. Many such hidden structures were discovered inadvertently during state exploration based on local tradition that Romanian Carpathians are rich in vein and skarn ore types. Notable dichotomy between porphyries associated with peripheral skarns versus epithermal ores is expressed by age (Mesozoic versus Tertiary), precious metal content, alteration types and zoning, shape/size and extension of ore bodies. Preliminary conclusions on metallic/alteration assemblages around porphyries in addition to geophysical information about inferred deep-seated Alpine plutonism promote potential exploration vectors for what will be an increasingly important deposit type in the future.  相似文献   

Morphology and post-Chaudian (Late Pleistocene) evolution of the submarine Danube fan complex     

H.K. Wong  N. Panin  C. Dinu  P. Georgescu  C. Rahn 《地学学报》1994,6(5):502-511

The Danube deep sea fan in the northwestem Black Sea has a lateral dimension of over 150 km and stretches from several hundred metres water depth down to the abyssal plain. Eight seismic sequences have been recognized in the fan complex. Each sequence consists of channel, levee and overbank deposits, as well as mass transport units. The Danube and the Ukrainian rivers have aggraded two surficial channel-levee systems which diverge and decrease in volume downfan. The channels of these systems have a low sinuosity, implying young age, steep gradients and/or limited sediment supply. Significant channel migration occurred in the course of fan development, which could be largely controlled by relative sea-level changes. The six youngest sequences mapped have been correlated to sea-level fluctuations from the post-Chaudian regression to the present day.  相似文献   

Age of the Chibit Glaciation in Gornyi Altai     

Zolnikov  I. D.  Deev  E. V.  Kurbanov  R. N.  Panin  A. V.  Vasiliev  A. V.  Pozdnyakova  N. I.  Turova  I. V. 《Doklady Earth Sciences》2021,496(2):176-181

Doklady Earth Sciences - New results of Optically-Stimulated Luminescence (OSL) dating that make it possible to clarify the age of the Chibitskii glaciation in the Altai Mountains are reported....  相似文献   

The Riverine Past of Lake Seliger     

Konstantinov  E. A.  Panin  A. V.  Karpukhina  N. V.  Bricheva  S. S.  Borisova  O. K.  Naryshkina  N. N.  Gurinov  A. L.  Zakharov  A. L. 《Water Resources》2021,48(5):635-645

Water Resources - Lake Seliger has been always classified as a former glacial water body, a remnant of a vast proglacial lake, which has existed since the disappearance of the last glacial Ice...  相似文献   

EXPERIENCE IN THE DEVELOPMENT AND USE OF A GEOLOGY-GEOMORPHOLOGY BLOCK IN A GEOGRAPHIC INFORMATION SYSTEM     

A. V. Bredikhin  A. V. Panin 《地理信息系统科学与遥感》2013,50(1):50-58

The authors describe the results of a long-term program for the testing and refinement of a geology-geomorphology block in an instructional GIS at a scientific field station administered by Moscow University. Particular attention is devoted to the formulation of a series of practical exercises designed to familiarize students with the capabilities and limitations of GIS in the solution of practical geological and geomorphological problems. Translated by Edward Torrey, Alexandria, VA 22308 from: Geomorfologiya, 1994, No. 2, pp. 86-94.  相似文献   

Evolution of Tere-Khol lake and the holocene dynamics of the environment in the southeastern part of the Sayan-Tuva highland     

A. V. Panin  M. A. Bronnikova  O. N. Uspenskaya  I. A. Arzhantseva  E. A. Konstantinov  A. V. Koshurnikov  E. V. Selezneva  Yu. N. Fuzeina  E. D. Sheremetskaya 《Doklady Earth Sciences》2012,446(2):1204-1210

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Downstream variation in bed sediment size along the East Carpathian rivers: evidence of the role of sediment sources     

Maria Rădoane  Nicolae Rădoane  Dan Dumitriu  Crina Miclăuş 《地球表面变化过程与地形》2008,33(5):674-694

Taking as an example six main rivers that drain the western flank of the Eastern Carpathians, a conceptual model has been developed, according to which fluvial bed sediment bimodality can be explained by the overlapping of two grain size distribution curves of different origins. Thus, for Carpathian tributaries of the Siret, coarse gravel joins an unimodal distribution presenting a right skewness with enhanced downstream fining. The source of the coarse material distributions is autohtonous (by abrasion and hydraulic sorting mechanisms). A second distribution with a sandy mode is, in general, skewed to the left. The source of the second distribution is allohtonous (the quantity of sand that reaches the river‐bed through the erosion of the hillslope basin terrains). The intersection of the two distributions occurs in the area of the 0·5–8 mm fractions, where, in fact, the right skewness (for gravel) and left skewness (for sand) histogram tails meet. This also explains the lack of particles in the 0·5–8 mm interval. For rivers where fine sediment sources are low, the 0·5–8 mm fractions have a higher proportion than the fractions under 1 mm. For the Siret River itself, bed sediment bimodality is greatly enhanced due to the fact that the second mode is more than 25% of the full sample. As opposed to its tributaries, the source of the first mode, of gravel, is allohtonous to the Siret river, generated by the massive input of coarse sediment through the Carpathian tributaries, while the second mode, of the sands, is local. In this case we can also observe that the two distributions of particles of different origins overlap in the 0·5–8 mm fraction domain, creating the illusion of ‘particle lack’ in the fluvial bed sediments. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

On the influence of reflection over a rhythmic swash zone on surf zone dynamics     

Rafael Almar  Alexandre Nicolae Lerma  Bruno Castelle  Timothy Scott 《Ocean Dynamics》2018,68(7):899-909

The reflection of incident gravity waves over an irregular swash zone morphology and the resulting influence on surf zone dynamics remains mostly unexplored. The wave-phase resolving SWASH model is applied to investigate this feedback using realistic low-tide terraced beach morphology with well-developed beach cusps. The rhythmic reflection generates a standing wave that mimics a subharmonic edge wave, from the superimposition of incident and two-dimensional reflected waves. This mechanism is enhanced by shore-normal, narrow-banded waves in both direction and frequency. Our study suggests that wave reflection over steep beaches could be a mechanism for the development of rhythmic morphological features such as beach cusps and rip currents.  相似文献   

Tame and chaotic behavior in the planar isosceles 3-body problem     

Florin Nicolae Diacu 《Celestial Mechanics and Dynamical Astronomy》1990,50(4):313-324

We show that every planar isosceles solution of the three-body problem encounters a collision of the symmetric particles, either forwards or backwards in time. Regularizing analytically this collision, the solution has at least a syzygy configuration and/or leads to a total collapse. Some further simple results support the intuitive image on the tame local behavior of the motion as long as it does not lead to a triple collision. As a main result we prove that total collapse singularities, can be regularized in aC ¹-fashion with respect to time, for all values of the masses. Using symbolic dynamics, the chaotic character of theC ¹-regularized solutions is pointed out.  相似文献