ZONING THE KARSTIFIED TERRITORIES OF THE KALUGA REGION USING AN INTEGRATED APPROACH TO IDENTIFY FAVORABLE AREAS FOR CONSTRUCTION

The article considers 17 factors of natural structure of the territory of the Kaluga region divided into 4 groups: geological, hydrogeological, structural-tectonic and geomorphological. The relationship between each factor and the development of surface karst forms has been analyzed. Laws of distribution of karst forms and factors boundary values corresponding to intervals with different degree of danger are defined. The final assessment of the karst hazard was carried out by means of ESRI ArcGIS 10 using an integrated approach that takes into account the role of each factor in the development of the karst process as much as possible.

STUDY OF THE KARST PROCESS DYNAMICS IN KHÓZUÈ: CALCAREOUS MASSIF OF CHERINGOMA PLATEAU (MOZAMBIQUE)

The present research was developed aiming to study macroscopically the effects of karstification that, over the time, affected significantly the carbonated massif in Khózuè, Cheringoma Plateau (Mozambique). The research was carried out from a field study (collecting samples and photos) for a period of one week, in May of 2017, in Khózuè. During the field work, evidences found in nature were recorded as well as, the mode of occurrence of several structures (caves, dolines and speleothems). The karstification in the study area that occurs in the Cheringoma Formation (from Middle Eocene) was greatly conditioned by fractures which influenced the process and formation of caves and dolines. These structures tended to follow morphological patterns depending on guide fractures orientation allied to their genesis and creating, in certain cases, dolines with a cross morphology. In addition to caves and dolines, karstic activity in the Cheringoma Formation massif also created other structures, especially speleothems, which are not widespread, and also preservation/fossilization of plant remains by mineralization. Chemical weathering chemical weathering, but especially internal geodynamic phenomena transformed the Khózuè massif one karst region with peculiar characteristics. ResumoEste trabalho foi desenvolvido com o objetivo de estudar macroscopicamente os efeitos da carstificação que, com o tempo, afetaram significativamente o maciço carbonatado de Khózuè, no platô de Cheringoma (Moçambique). A pesquisa foi realizada a partir de um estudo de campo (coleta de amostras e fotografias), em 2017, em Khózuè. Durante as atividades de campo, foram analisadas as estruturas encontradas na área de estudo, tal como a ocorrência de falhas, cavernas, dolinas e espeleotemas. A carstificação na área de estudo, associada á Formação Cheringoma (do Eoceno Médio), foi muito influenciada por falhas. Estas favoreceram a formação de cavernas e dolinas. Essas estruturas tenderam a assumir padrões morfológicos condicionados pela orientação de falhas. Em certos casos, as falhas deram origem por exemplo a dolinas em forma de cruz. Além de cavernas e dolinas, a atividade cárstica no maciço da Formação Cheringoma deu lugar também a outras estruturas, como por exemplo, espeleotemas encontrados em apenas alguns locais e a processos de preservação/fossilização por mineralização de restos vegetais. A meteorização química, mas sobretudo fenómenos de geodinâmica interna transformaram o maciço calcário de Khózuè uma região cárstica com características peculiares. Palavras-chave: Karstificação. Cavernas. Dolinas. Espeleotemas. Fossilização. Fraturas.

The Morphological Research of the Basalt and Loess Covered Plateaus in the Bakony Mts. (Transdanubian Middle Mts. – Hungary)

V članku poročamo o morfoloških raziskavah na puhlični planoti Tési in z bazaltom prekritim kraškim območjem v okolici gore Kab na južnem delu gorovja Bakony. Skoraj 600 m visoka gora Kab, prekrita z bazaltom, izstopa iz hribovitega predela južnega dela gorovja Bakony. Površina gore, ki meri kakih 35-40 km², je prekrita z različno debelim bazaltom. Na bazaltnem površju so razvite psevdokraške oblike (depresije), ki so posledica zakrasevanja apnenca pod bazaltom. Z združevanjem glede na morfologijo in hitrost razvoja ter študijem korelacije genetskih značilnosti nastalih združb, smo izluščili nove kraške procese, kjer smo lahko depresije različnih oblik intepretirali kot različne stopnje iste razvojne poti. Mezozojske kamnine planote Tési le redko pogledajo na površje izpod pokrova puhlice. Blizu vrhov so nastajale udorne in ponorne vrtače z zelo omejenim območjem napajanja. Raziskave procesov, oblik in pojavnosti pokritega krasa gore Bakony so pokazale, da je nastanek recentnih jaškov povezan s skritimi litološkimi mejami. Pomembno vlogo pri razvoju površinskih oblik pokritega krasa imajo tudi paleokraški kanali, ki so se reaktivirali še pred nastankom puhlice. We have conducted our morphological researches on the loess-covered Tési plateau and on the basalt covered karst area around Mt. Kab in the southern part of the Bakony Mts. The nearly 600 m high basalt covered Mt. Kab emerges high from the undulating mountains and hilly areas of the Southern Bakony Mts. Its surface, an area about 35-40 km² is covered by basaltic rocks of different thickness. Pseudokarstic landforms (depressions) developed on the basalt surface due to the karstic corrosion of the buried limestone layers. Grouping the objects of different morphology and evolution rate, and studying in corellation the genetic marks of the significantgroups,a special karst process can be drawn, in which the depressions of various form can be understood as different stations of the same evolutionary series. The Mesosoic rocks building up the 60 km² Tési plateau emerge to the surface rarely above the loess cover. There is agricultural activity on most part of the plateau. Typical covered karstic landforms developed on the 3-5 m thick loess cover. Subsidence dolines or alluvial streamsink dolines with a small catchment area were formed on the summits. We studied the processes, forms and occurrence of recent covered karst of Mt. Bakony, and these studies shows that on the covered karst surface of the Tési-plateau the recent pit formation along with baticapture connected to hidden and real rock boundary, as well as the opening and activation of paleokarstic passages developed before loess formation also play a role in the evolution of the covered karst surface forms of the Tési-plateau.

The Soil and Vegetation Effect on Carbon Transfer Path in Epigenic Karst System

It was proved that karst processing during groundwater cycle is one of carbon sinks to the atmosphere CO2. To understand the carbon transfer path among the three phases of air, carbonate rocks and karst groundwater in epigenic karst system is very important for mechanic studies of karst carbon sink. There are 8 carbon stable isotope sample sites, including 5 groundwater sites and 3 gaseous CO2 sites in Banzhai river catchment. The total 41 samples, including 38 karst water samples and 3 CO2 samples are acquired in a whole hydrological year of 2010. 4 couples CO2 partial pressure including free air and soil air are tested in site. Based on analysis the carbon stable isotope and CO2 partial pressure data above, it is found that the mostly carbon in free air and karst water is from soil air. The carbon transfer path in epigenic karst system can be divided into 4 steps: 1 the photosynthesis of vegetation take CO2 from free air; 2 the respiration of plant roots and decomposition of humic substance release CO2 to soil layer; 3 the gaseous CO2 is transfer to liquid HCO3- negion by karst process during the water cycle; 4 the bicarbonate in groundwater move to river or ocean fellow the groundwater flow. The forest and soil takes a booster pump action increasing the CO2 partial pressure from free air to soil and it is very important in karst process.