|
|
Natural environment of the Moon
Lulák, Martin ; Kalvoda, Jan (advisor) ; Křížek, Marek (referee)
This presented bachelor paper aims to describe the environment of the Moon based on accessible publications. It is especialy focused on the morphology of the most striking lunar landforms, as well as the origin of the Moon and its geological evolution, description of formation and characteristics of lunar regolith and effects of space weathering on lunar landforms. The second part of the paper is aimed at the morphological description of large impact craters - Tycho and Plato. Owing to the different age of these selected complex craters, it is possible by correlation of their patterns to demonstrate effects of main processes changing the Moon's surface. Key words: Moon, impactor, impact craters, space weathering, multi-ring impact basin, regolith, selenography, Tycho, Plato
|
|
|
Geophysical and remote sensing methodologies applied to the analysis of regolith and geology in Burkina Faso, West Africa
Metelka, Václav ; Ježek, Josef (advisor) ; Miller, John (referee) ; Martelet, Guillaume (referee) ; de Kemp, Eric (referee)
The oldest parts of continents, so-called cratons, are the focus of worldwide research not only because they represent primary constraints for our understanding of the early evolution of the Earth, but also because of their significant mineral potential. This work contributes to the understanding of the geological and geomorphological evolution of the West African Craton, by an integrated analysis of airborne geophysical and satellite remote sensing data constrained by field structural, lithological, geophysical, and geomorphological observations acquired around Houndé, Boromo and Banfora greenstone belts and associated granitoid domains in western Burkina Faso. The results of this integration suggest that the granitoid domains of western Burkina Faso are formed by numerous small- to medium-sized plutons, and the magnetic data provided a better definition of the actual pluton shapes. Airborne gamma ray spectrometry data aided in the mapping process in areas with less regolith cover. Three deformation events (D1-D3) can be distinguished in western Burkina Faso. A megacrystic tholeiitic basalt unit allowed us to establish stratigraphic correlations between the two belts and propose a crustal scale anticline (D1). The D1 penetrative structures, resulting from an E-W to WNW-oriented compression are...
|
|
|
YORP effect on asteroids with heterogeneous distribution of surface thermophysical properties
Chrbolková, Kateřina ; Čapek, David (advisor) ; Ďurech, Josef (referee)
In this thesis, we study the influence of heterogeneous distribution of optical and thermal properties on asteroid surfaces onto the YORP effect. Modelling of the surface heterogeneities is done in three ways. In the first one, we create an impact crater with higher albedo regolith on a regolith-covered asteroid. In the second way, we suppose presence of higher albedo regolith on steep slopes (slope angle > 35◦ ) and in the third one, we state properties of bare rock (with different thermal parameters) in these areas. Then we evaluate the influence of torques caused by scattered or thermally emitted radiation on 200 asteroids based on different distribution of described parameters by means of statistics. We have found that the presence of heterogeneities caused by landslides on asteroid surfaces does not significantly affect the YORP effect with two exceptions: a slight inclination to decelerate the rotation in the case of landslides uncovering bare rock due to critical rotation and significant preference for deceleration in the configurations with uncovered higher albedo regolith on steep slopes. Our data suggest that the influence of heterogeneous distribution of optical properties caused by landslides on the value of typical acceleration time, so-called doubling time td, is 2 % and it does not exceed 5 % in the case...
|
|
|
Geophysical and remote sensing methodologies applied to the analysis of regolith and geology in Burkina Faso, West Africa
Metelka, Václav ; Ježek, Josef (advisor) ; Miller, John (referee) ; Martelet, Guillaume (referee) ; de Kemp, Eric (referee)
The oldest parts of continents, so-called cratons, are the focus of worldwide research not only because they represent primary constraints for our understanding of the early evolution of the Earth, but also because of their significant mineral potential. This work contributes to the understanding of the geological and geomorphological evolution of the West African Craton, by an integrated analysis of airborne geophysical and satellite remote sensing data constrained by field structural, lithological, geophysical, and geomorphological observations acquired around Houndé, Boromo and Banfora greenstone belts and associated granitoid domains in western Burkina Faso. The results of this integration suggest that the granitoid domains of western Burkina Faso are formed by numerous small- to medium-sized plutons, and the magnetic data provided a better definition of the actual pluton shapes. Airborne gamma ray spectrometry data aided in the mapping process in areas with less regolith cover. Three deformation events (D1-D3) can be distinguished in western Burkina Faso. A megacrystic tholeiitic basalt unit allowed us to establish stratigraphic correlations between the two belts and propose a crustal scale anticline (D1). The D1 penetrative structures, resulting from an E-W to WNW-oriented compression are...
|
|
|
Natural environment of the Moon
Lulák, Martin ; Kalvoda, Jan (advisor) ; Křížek, Marek (referee)
This presented bachelor paper aims to describe the environment of the Moon based on accessible publications. It is especialy focused on the morphology of the most striking lunar landforms, as well as the origin of the Moon and its geological evolution, description of formation and characteristics of lunar regolith and effects of space weathering on lunar landforms. The second part of the paper is aimed at the morphological description of large impact craters - Tycho and Plato. Owing to the different age of these selected complex craters, it is possible by correlation of their patterns to demonstrate effects of main processes changing the Moon's surface. Key words: Moon, impactor, impact craters, space weathering, multi-ring impact basin, regolith, selenography, Tycho, Plato
|
guest ::
