O Parque Estadual da Cachoeira da Fumaça (PECF) localiza-se nos municípios de Alegre e Ibitirama, ES. O mapeamento geológico realizado na região definiu cinco unidades litológicas principais, dentre as quais, duas predominam e possuem forte anisotropia interna: granada-biotita gnaisse e biotita-gnaisse. O estudo microscópico demonstrou presença de minerais secundários nas rochas, indicando a ação de agentes de intemperismo. Os elementos estruturais mostraram a interação entre diversas direções de fraturas e anisotropias internas as rochas, condicionando a individualização de blocos no maciço rochoso, com implicações em termos de risco geológico. A ação conjunta do intemperismo com os elementos estruturais e litológicos foram responsáveis por esculpir o relevo e formar a cachoeira. Com base nos resultados obtidos, aconselha-se a limitação de acesso próximo as escarpas da cachoeira e o aproveitamento dos elementos geológicos e geomorfológicos locais como atrativos ao turismo. Preliminary Geological Mapping and Petrology in the Cachoeira da Fumaça State Park,ES, Brazil - Elements to management of Protected AreasAbstractThe Cachoeira da Fumaça Park is located in Alegre, ES. The Geological mapping carried out in theregion, had defined five main lithological units, among which two predominate and have a stronginternal anisotropy: garnet-biotite gneiss and biotite-gneiss. The microscopic study showed the presenceof secondary minerals in the rocks, indicating the action of weathering agents. The structuralelements showed the interaction between different directions of fractures and internal anisotropies inthe rocks, conditioned on individualization of blocks in the rock mass, with implications for geologicalhazard. The conjugate action of weathering with lithological and structural elements was responsiblefor sculpting the topography and to form the waterfall. Based on these results, it is advisable to limitaccess to the cliffs near the waterfall and use elements of geological and geomorphological sites astourism attractions. Cartografia Geologica Preliminar y Petrologia en el Parque Estatal de la Cachoeira da Fumaça,ES, Brasil - Elementos para la Gestion de Unidad de ConservacionResumen Lo Parque Estatal “Cachoeira da Fumaça” (PECF) esta situado en el municipio de Alegre, ES. En elmapeo geológico realizado en la región se definieron cinco principales unidades litológicas. Entre lasque predominan, dos tienen una fuerte anisotropía interna: granate-biotita gneis y gneis de biotita.El estudio microscópico mostro la presencia de minerales secundarios en las rocas, lo que indica laacción de agentes atmosféricos. Los elementos estructurales mostró la interacción entre diferentesdirecciones de las fracturas de las rocas y las anisotropías interna, condicionado a la individualizaciónde los bloques en la masa de roca, con implicaciones para el riesgo geológico. La acción conjunta de laintemperie con elementos litológicos y estructurales, se encargo de esculpir la topografía y la forma dela cascada. En base a estos resultados, es recomendable limitar el acceso a los acantilados cerca de lacascada y el uso de elementos de los sitios geológicos y geomorfológicos como atracciones turísticas.DOI: 10.7147/GEO10.1773
Ultrasonic longitudinal wave velocity (Vp) and durability are characteristics largely determined in geotechnical evaluations. These properties are useful in the analysis of weathered rocks because they usually have good relationships with physical and mechanical properties of rocks. Additionally, the tests to obtain these parameters are easy to perform. However, few studies have been performed specifically on low degree metamorphic rocks. The purpose of this study is to evaluate the influence of weathering on these parameters, as to propose correlations between Vp and some mechanical and physical parameters. This study was carried out using phyllites from three weathering profiles located along the highway BR-356, Minas Gerais, Brazil. The results reveal a clear influence of weathering on Vp and durability mainly due to increased porosity. However, as the variation of this parameter is heterogeneous, the relationship between Vp, durability, and weathering is not uniform, although they present general trends. The behavior shown by porosity reflects the complex role of chemical weathering on fractures. The non-uniform pattern of Vp and durability throughout the weathering classes is also a consequence of the heterogeneity and anisotropy intrinsic to these phyllites. The empirical relationships established exhibit good correlation coefficients.
Por orientação do PC (Juventude do PC), o personagem casou-se com uma colega comunista, filha de fazendeiro da fronteira. Trabalhou como peão, idealizou dez romances e escreveu três que cobririam toda a área econômica do Estado. O primeiro foi Fronteira do agreste, o mais importante; o segundo, Caminhos do Sul, que reúne contos esparsos, mas tem uma unidade romanesca; e o terceiro, Casas acolheradas. Um dos pontos discutidos pelo professor Antonio em sua pesquisa é o chamado romance coletivista, em que o personagem não é mais um ser humano, mas uma unidade geográfica de produção: no primeiro, a transformação da estância em fazenda; no segundo, as estradas; o terceiro pega as cidades de campanha. Isso é muito bem apresentado por Ivan Pedro Martins em seus livros.
A mineralogical, geological and geotechnical characterization of several rock types (phyllite, dolomite, breccia and marl) from an underground mine site aimed, among other things, to identify its mineral composition and to provide parameters to support the understanding of rock mass behavior. For this purpose, it was possible to perform laboratory and in situ tests or use existing empirical correlations. In this manuscript, the results of the following laboratory tests are presented and analysed-physical indices, point load test, Schmidt Hammer, uniaxial compression strength, wave propagation, micropetrographic description and X-ray diffraction. It was verified that the results obtained are consistent with other studies carried out in the region and also with results from the technical literature for similar lithotypes. Finally, the results contributed to improve the existing database on correlations among different trials.
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