نتایج جستجو برای: karst filling
تعداد نتایج: 41413 فیلتر نتایج به سال:
Timing and duration of ore deposit formation are crucial to understanding the mineralization process. To address this, geochronological (U-Th)/He method, geochemical H- O-isotope compositions pure goethite formed in Imini karst-hosted Mn district (High Atlas, Morocco) were examined detail. Two main generations cavity-filling fracture-filling identified, both precipitated prior massive oxide ore...
Karst flash flooding, identified as one of the hazards in karst terrains, is directly linked to the structure and hydraulic properties of karst aquifers. Due to the characteristics of flow within karst aquifers, characterized by a dual flow – diffuse flow within fissured limestone and conduit flow within karst conduits networks – flash flooding may be important in volume and dynamics. Such phen...
v Page Introduction Geologic Setting Hydrologic Setting Hypogenic Speleogenesis Coffee Cave Discussion Conclusions Acknowledgements IV. CASTILE EVAPORITE KARST POTENTIAL MAP OF THE GYPSUM PLAIN, EDDY COUNTY, NEW MEXICO AND CULBERSON COUNTY, TEXAS: A GIS METHODOLOGICAL COMPARISON Abstract Introduction Geologic Setting Field Studies GIS Analyses Discussion Conclusions Acknowledgements V. EPIGENE ...
To determine the role of microbes in karst processes, it is necessary to investigate the ecological distribution and characteristics of soil microorganisms in karst areas. In this paper, a preliminary study was carried out in two different karst areas of Southwest China: Nongla and the Guilin Yaji Karst Experimental Site (Guangxi). Soil samples from 10–20 cm in depth were analyzed for the numbe...
چکیده ندارد.
Karst topography covers more than 1/3 of the People's Republic of China in area. The porous, fissured, and soluble nature of the underlying karst bedrock (primarily dolomite and limestone) leads to the formation of underground drainage systems. Karst conduit networks dominate this system, and rainfall takes a crucial role on water cycle at China karst area. Nitrogen loss from the karst system i...
Karstic zones play an important role in feeding the karstic aquifers؛ therefore, recognizing the factors affecting the karst mutation and its zonation in the field of studies concerned with karst water resources is of great concern. The results of these studies can be applied to quantitative and qualitative management and protection of these resources against the pollutions coming from human ac...
the treatment of in completely formed pulpless teeth has presented considrable problems. these teeth have wide open apexes and the walls of the root canal diverge toward the apical tissues. mechanical preparation cannot be done in the normal manner beacause of the large initial size and the taper of apical part of the canal , a mechanical stop cannot be produced at the apex of the canal and , t...
The chief objective of the article is to learn spatial characteristics stress distribution around a shallow buried spherical Karst cave containing fill materials in limestone strata. First, considering effect external load, field Earth’s crust, internal filling and geomorphology China, axisymmetrical model was established. Concurrently, combing available work concept elasticity, boundary condit...
In China, 9Ð5% of the landmass is karst terrain and of that 47,000 km2 is located in semiarid regions. In these regions the karst aquifers feed many large karst springs within basins of thousands of square kilometres. Spring discharges reflect the fluctuation of ground water level and variability of ground water storage in the basins. However, karst aquifers are highly heterogeneous and monitor...
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