A comparison of measured and calculated elastic anisotropies of marble     

Karel Klíma  Vladislav Babuška 《Studia Geophysica et Geodaetica》1968,12(4):377-384

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Effect of small potassium-rich dykes on regional gamma-spectrometry image of a potassium-poor volcanic complex: A case from the Doupovské hory Volcanic Complex, NW Czech Republic   总被引：1，自引：0，他引：1  

Skcelov Zuzana  Rapprich Vladislav  Ml och Bed&#x;ich 《Journal of Volcanology and Geothermal Research》2009,187(1-2):26-32

Basaltic rocks with low K, U and Th contents dominate the entire Volcanic Complex of the Doupovské hory Mts. Significant potassium anomaly exceeding 1.5 atomic wt.% of potassium over an area of 4 × 8 km and 2 atomic wt.% of potassium over an area of 2 × 6 km was defined by airborne gamma-ray spectrometry above the central part of the Doupovské hory Volcanic Complex. The following detailed field study, supported by field and laboratory gamma-spectrometry measurements and geochemical analyses of rock samples, resulted in discovery of a swarm of potassium-rich trachytic dykes. The existence of such highly-differentiated rocks in the volcanic complex was unknown till present. These dykes are commonly less than 1 m wide, but their potassium content varies between 4 and 8 atomic wt.%. Owing to this high-K composition and relative abundance of dykes, the dyke rocks significantly modify the regional pattern of gamma-spectrometry data. The potassium anomaly cannot be explained by the presence of Flurbühl intrusive body dominated by ijolites and essexites, as all these rocks are poor in K, with potassium typically not exceeding 1.5 wt.%. On the other hand, much more extensive intermediate trachybasaltic lavas with K content varying within the range 1.8–3 wt.% cause only minor or undetectable anomalies.  相似文献   

Dynamics of “jumping” Trojans: a perturbative treatment     

Vladislav V. Sidorenko 《Celestial Mechanics and Dynamical Astronomy》2018,130(10):67

The term “jumping” Trojan was introduced by Tsiganis et al. (Astron Astrophys 354:1091–1100, 2000) in their studies of long-term dynamics exhibited by the asteroid (1868) Thersites, which had been observed to jump from librations around \(L_4\) to librations around \(L_5\). Another example of a “jumping” Trojan was found by Connors et al. (Nature 475:481–483, 2011): librations of the asteroid 2010 TK7 around the Earth’s libration point \(L_4\) preceded by its librations around \(L_5\). We explore the dynamics of “jumping” Trojans under the scope of the restricted planar elliptical three-body problem. Via double numerical averaging we construct evolutionary equations, which allow analyzing transitions between different regimes of orbital motion.  相似文献   

The thermo-tectonic history of the Song-Kul plateau, Kyrgyz Tien Shan: Constraints by apatite and titanite thermochronometry and zircon U/Pb dating     

Johan De Grave  Stijn Glorie  Mikhail M. Buslov  Andrei Izmer  Alena Fournier-Carrie  Vladislav Yu. Batalev  Frank Vanhaecke  Marlina Elburg  Peter Van den haute 《Gondwana Research》2011,20(4):745-763

The Song-Kul Basin sits on a plateau at the Northern and Middle Kyrgyz Tien Shan junction. It is a lacustrine basin, occupied by Lake Song-Kul and predominantly developed on igneous basement. This basement was targeted for a multi-method chronological study to identify the different magmatic episodes responsible for basement formation and to constrain the timing of the development of its present-day morphology. Zircon U/Pb dating by LA-ICP-MS revealed four different magmatic episodes: a Late Cambrian (~ 500 Ma) island arc system, a Late Ordovician (~ 450 Ma) subduction related intrusion, an Early Permian (~ 290 Ma) collisional stage, and a Middle to Late Permian (~ 260 Ma) post-collisional magmatic pulse. Middle to Late Triassic (~ 200–230 Ma) titanite fission-track ages and Late Triassic – Early Jurassic (~ 180–210 Ma) apatite fission-track ages and thermal history modeling indicate the Song-Kul basement was already emplaced in the shallow crust at that time. An exhumed fossil apatite fission-track partial annealing zone is recognized in the bordering Song-Kul mountain ranges. The area experienced only minor post-Early Mesozoic denudation. The igneous basement was slowly brought to apatite (U–Th)/He retention temperatures in the Late Cretaceous–Palaeogene. Miocene to present reactivation of the Tien Shan does not manifestly affect this part of the orogen.  相似文献   

The Sorgenfrei–Tornquist Zone as the mantle edge of Baltica lithosphere: new evidence from three-dimensional seismic anisotropy     

Vladislav Babu&#;ka  Jaroslava Plomerová 《地学学报》2004,16(5):243-249

Joint analysis of shear‐wave splitting parameters and directional dependence of teleseismic P residuals based on data from the seismic experiment TOR across the Trans‐European Suture Zone suggest that the Sorgenfrei–Tornquist Zone (STZ) in northern Denmark forms the south‐western margin of Baltica in the upper mantle. Different lithosphere thickness and different orientation of seismic anisotropy in the mantle lithosphere identify three domains separated by the STZ between Denmark and southern Sweden and the Thor Suture between northern Germany and Denmark. We suggest that the anisotropy reflects frozen‐in olivine fabrics, most probably created during early stages of the evolution of the European continent. The middle Danish block might represent a microplate caught in between Avalonia and Baltica before the Caledonian orogeny.  相似文献   

Comprehensive framework for gradient-based optimization in closed-loop reservoir management     

Vladislav Bukshtynov  Oleg Volkov  Louis J. Durlofsky  Khalid Aziz 《Computational Geosciences》2015,19(4):877-897

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Quasi-satellite orbits in the general context of dynamics in the 1:1 mean motion resonance: perturbative treatment     

Vladislav V. Sidorenko  Anatoly I. Neishtadt  Anton V. Artemyev  Lev M. Zelenyi 《Celestial Mechanics and Dynamical Astronomy》2014,120(2):131-162

Our investigation is motivated by the recent discovery of asteroids orbiting the Sun and simultaneously staying near one of the Solar System planets for a long time. This regime of motion is usually called the quasi-satellite regime, since even at the times of the closest approaches the distance between the asteroid and the planet is significantly larger than the region of space (the Hill’s sphere) in which the planet can hold its satellites. We explore the properties of the quasi-satellite regimes in the context of the spatial restricted circular three-body problem “Sun–planet–asteroid”. Via double numerical averaging, we construct evolutionary equations which describe the long-term behaviour of the orbital elements of an asteroid. Special attention is paid to possible transitions between the motion in a quasi-satellite orbit and the one in another type of orbits available in the 1:1 resonance. A rough classification of the corresponding evolutionary paths is given for an asteroid’s motion with a sufficiently small eccentricity and inclination.  相似文献   

古新世特提斯北缘前黑海地区盆地的演化与油气远景   总被引：1，自引：0，他引：1  

B. M. 波诺托维奇  O. V. 萨马斯加  V. Yu. 塔柯维斯基 《沉积与特提斯地质》1997,17(4):40-49

本文以ＥＸＸＯＮ公司Ｐ．Ｒ．Ｖａｉｌ等人创立的层序地层学理论为准，对华南泥盆系的层序地层进行了区域上的研究、分析、对比。研究结果表明，从下泥盆统的洛赫科夫阶至上泥盆统的法门阶可识别出２０～２１个Ⅲ级层序。华南泥盆系的岩石地层、生物地层、年代地层的系、统、阶界线均已确定，与层序地层研究结果对比，生物地层界线均比相应的层序地层界线滞后。本文试图以层序地层序列为准，建立一新的地层系统作为相应的生物地层、年代地层的系、统、阶相对应的辅助性地层系统。研究结果表明，在岩石地层、生物地层、年代地层研究程度高的地区，可建立层序地层的系、统、阶界线系统以利于野外作业。华南地区的泥盆系内，除弗拉斯阶与法门阶的阶间界线置于饥饿层（ｓｔａｒｖｅｄｓｅｃｔｉｏｎ）外，其他的阶、统、系界线均位于有关阶（统）顶部层序中的ＨＳＴ的顶面。  相似文献   

3-D Visual Drill and Blast Design     

Vladislav J. Kecojevic  Marek J. Mrugala  William A. Wilkinson 《Fragblast: International Journal for Blasting and Fragmentation》2003,7(3):167-179

State-of-the-art software and computer technology provides a vehicle for a new approach to designing and verification of blasting patterns and training of professionals in this area of mining. The objective of this paper is to discuss the use of 3-D computer graphics to improve the understanding of the challenges facing drill and blast operations and describe technologies available for drill and blast planning in surface mining. It is postulated that this approach will have a positive impact on future students, researchers, and mine operators by improving their ability to use techniques, skills, and visually rich tools in solving and documenting mining engineering problems.  相似文献   

Применение автоматических вычислительных машин при нахождении целесообразных вариантов картографических проекций     

Vladislav Hojovec 《Studia Geophysica et Geodaetica》1966,10(1):24-37

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