GEOESPELEOLOGIA
URI permanente para esta coleçãohttps://bdc.icmbio.gov.br/handle/cecav/2
Navegar
3 resultados
Resultados da Pesquisa
Item Preliminary inventory and conservation conditions of speleotems from Gruta da Serra das Cobras, Santa Quitéria, Ceará, Brazil(2024) Paiva, Antonio Victor Rodrigues Sousa de; Carvalho, Bruna Lima; Xinenes, Celso Lira; Fernandes, Nayane Barros Sousa; Sobrinho, José FalcãoNatural underground cavities are environments composed of unique characteristics that house a great complexity of geological formations and lush scenery. The underground environment is considered a true treasure for science and humanity. The main objectiveof this research is to identify and classify the different types of speleothems found in Gruta das Cobras located in the municipality of Santa Quitéria/CE, also highlighting the risks that these structures face in terms of conservation. The materials and methods consisted of bibliographical research, fieldwork, photographic records and analysis and interpretation of information obtained at all stages. In general, the most common speleothem formation present in the study area is of the stalactite and stalagmite type. Speleothems of the column type, Bridal cake and Boxwork type were recorded inside the cave, complex formations that take millions of years to form and which are currently being impacted by the tourism sector, with no regulation or inspection. Impacts on structures, graffiti and breakage of speleothems were identified. In this way, it is concluded that further studies on the site are essential, as well as a preservation intervention by the competent public bodies.Item Caves, Karst Features and Speleological Heritage in Chapada Diamantina, Bahia, Brazil(2023-12-09) Parra, Raphael; Pereira, Ricardo Galeno Fraga de Araujo; Purificação, Carlos Gleidson Campos daChapada Diamantina is among the best known and most visited landscapes in Brazil. Located in the state of Bahia, Northeast region of the country, it is characterized by mountains and plateaus that developed on Proterozoic sedimentary and metasedimentary rocks. Much of its territory is covered by carbonate and siliciclastic rocks, where relevant karst systems develop, marked by the occurrence of sinking streams, sinkholes, and caves with a great diversity of morphologies, speleothems, subterranean fauna, and paleontological and archaeological records. Relevant carbonate systems occur in Iraquara, such as the Lapa Doce, Torrinha, and Pratinha caves, which represent important tourist attractions. Also in these rocks, stand out the Brejões Cave, with a 106-m high entrance, and the Toca da Boa Vista, the largest cave in South America, extending across 114 km. Cultural manifestations are present in the prehistoric cave paintings at Santa Marta Shelter and recent religious pilgrimages at Mangabeiras Cave, in Ituaçu. In turn, siliciclastic karst systems are mainly in Serra do Sincorá. The Lapão and Castelo caves have expressive speleogens and speleothems, as well as the Torras Cave, in the Igatu region, ranked as the second largest in Brazil considering siliciclastic rocks.Item Correlations of rock mass classifications applied to ferruginous caves(2020-06) Oliveira, Paula Leal; Lima, Hernani Mota deFor the Brazilian iron ore mines, the presence of caves presents a challenge, since most of them are located within the ore deposit. The National Environment Commis- sion (CONAMA 347 Resolution/2004) establishes that the speleological heritage, as well as its area of influence, cannot sustain irreversible environmental impacts. The physical integrity of caves adjacent to mining operations is an issue of pivotal impor- tance to be scrutinised in studies towards the delimitation of the cave’s protection ra- dius. This article presents the study of various models of correlation between the RMR and Q systems used for the stability assessment of natural iron ore caves. In order to study a correlation between the RMR and Q systems, the most popular rock mass clas- sifications, and their application as a validation tool, a selection of measurements of Q and RMR, organized in a database from seven natural caves of ferruginous lithology, are submitted to a study and statistical analysis. An empirical equation was obtained from the data, using a simple linear regression. The result of the regression was com- pared with selected correlation equations and the best fit for the data was chosen. The best fit was the Rutledge & Pearson correlation equation, which presented the best combination of R² and S, after the equation created on basis of the real values for RMR, though the other equations have results similar to it. As the results were quite similar, the recommendation still is that correlations should be used with caution, and associ- ated to other methods and field analysis.