bluuebunny/crossref_metadata_2025_split huggingface dataset:
EVENTOS MUSICAIS CAUSAM IMPACTOS NO MICROCLIMA DE CAVERNAS? AVALIAÇÃO DAS ALTERAÇÕES NA ATMOSFERA SUBTERRÂNEA DA GRUTA MORRO PRETO (PETAR, IPORANGA-SP)
Authors: Lobo Heros Augusto Santos , Perinotto José Alexandre de Jesus , Boggiani Paulo César , Zago Silmara 
Published: January 2016

O presente trabalho apresenta os resultados do monitoramento de três parâmetros atmosféricos – temperatura ambiente (T), umidade relativa do ar (UR) e dióxido de carbono (CO2) – aferidos durante um evento musical na gruta Morro Preto, Parque Estadual Turístico do Alto Ribeira – PETAR (Iporanga-SP). A coleta e registro de dados – realizados antes, durante e depois do evento – foi realizada por meio de termohigrômetros com registradores e com sensores infra-vermelhos para CO2. Realizou-se também a contagem de pessoas presentes no dia do evento (247, no total), de forma a relacionar os dados coletados com o total de visitantes. Os dados foram analisados por meio dos seguintes procedimentos estatísticos: descrição, correlação linear e regressão linear múltipla. Os resultados e discussões evidenciam as pequenas alterações atmosféricas ocorridas no ambiente em decorrência do evento, sendo praticamente nulas para T e UR e mínimas para o CO2. Além disso, demonstram que as concentrações de CO2 variam também em função da dinâmica natural do ambiente – com especial destaque para a localização dos pontos de coleta e para a UR. Conclui-se que no caso específico da gruta Morro Preto, eventos musicais não causam impactos ambientais negativos à atmosfera cavernícola em função das características naturais da caverna que possibilitam troca relativamente alta de energia entre o ambiente subterrâneo e meio externo.Palavras-chave: Espeleoturismo; Gás Carbônico; Manejo Espeleológico; Microclima. ABSTRACT: This paper presents the results of the monitoring of three atmospheric parameters –environmental temperature (T), relative air humidity (RH) and carbon dioxide level (CO2) – during a musical event realized in the Cave of Morro Preto, located in the State Touristic Park of the Upper Ribeira River (PETAR) in the district of Iporanga, São Paulo State, Brazil. Termohygrometers with dataloggers (to measure T and RH) and infrared sensors (to measure CO2) were used to collect the data before, during and after the musical event. The number of people present on the day of the event was also determined (247 total) and these data were correlated with the environmental data using descriptive statistics, linear correlation and multiple linear regression. The results show that although small alterations did occur in the environment as a consequence of the event, they were pratically null for T and RH and minimal for the level of CO2. Moreover, the CO2 concentration already varies as a function of the natural dynamics of the environment at the points of data collection. It was therefore concluded that this musical event did not cause negative environmental impacts on this cave, especially since it has a relatively high energy exchange with the external environment.Keywords: Speleoturism; Carbon Dioxide; Speleological Management; Microclimate.
ESTRUTURAS DOBRADAS DO QUADRILÁTERO FERRÍFERO EM PERFIS GEOLÓGICOS DO SÉCULO XIX
Authors: Machado Maria Márcia Magela , Renger Friedrich Ewald , Ruchkys Úrsula Azevedo 
Published: January 2016

Na primeira metade do século XIX houve um acréscimo significativo de conhecimento sobre a geologia doQuadrilátero Ferrífero advindo do trabalho de naturalistas-viajantes e de especialistas europeus em exploraçãomineral que empreenderam pesquisas nesta região. Merecem atenção especial, principalmente, os trabalhosde Virgil von Helmreichen e Aimé Pissis pelo cunho prioritariamente geológico. As memórias geológicasde Helmreichen, geólogo e engenheiro de minas austríaco, incluem um perfil não retilíneo entre a cidadedo Rio de Janeiro e o rio Santo Antônio no sertão do São Francisco. Na região do Quadrilátero Ferrífero, odetalhamento do acamamento entre Tejuco e Caeté registra a estrutura dobrada conhecida hoje como Sinclinalde Gandarela. Pissis publicou em 1848 sua Mémoire sur la position géologique des terraines de la partieaustrale du Brésil; entre as pranchas que acompanham a publicação está um perfil geológico de cerca de12km que detalha o acamamento entre o Pico do Itacolomi, ao sul, até a Serra de Antônio Pereira, ao norte. Arepetição das camadas com inversão do mergulho de sul para norte caracteriza claramente o dobramento doAnticlinal de Mariana; um avanço considerável sobre as seções apresentadas por Eschwege em 1811 e 1816. ABSTRACT: During the first half of the 19th century a significant amount of geological knowledge concerning theQuadrilátero Ferrífero was produced by European naturalists and travellers as well as experts in mineralexploration. Among them the work of Virgil von Helmreichen, an Austrian geologist and mining engineer,and the French naturalist Aimé Pissis are of special interest. The memories of Helmreichen include a profilefrom Rio de Janeiro in the South to the Rio Santo Antonio in the interior of the São Francisco river basinto the North, passing over the Quadrilátero Ferrífero. Near Caeté it shows clearly the inversion of the dipof bedding, indicating a folded structure, today known as Gandarela Syncline. Pissis published in 1848 hisMémoire sur la position géologique des terraines de la partie australe du Brésil; one of the accompanyingfigures represents a 12km-section between the Itacolumi Peak in the South and the Serra de Antonio Pereirato the North, which details bedding and dip of rocks. Repetition of strata with inversion of the dip caracterizesclearly the folded structure of the Mariana Anticline, showing both examples a considerable progress comparedwith the sections of von Eschwege from 1811 and 1816.
EVIDÊNCIAS PALEOBOTÂNICAS DE INCÊNDIOS VEGETACIONAIS NO AFLORAMENTO MORRO PAPALÉO, PALEOZÓICO SUPERIOR DO RIO GRANDE DO SUL, BRASIL.
Authors: Jasper André , Manfroi Joseline , Schmidt Elisa Ost , Machado Neli Teresinha Galarce , Konrad Odorico , Uhl Dieter 
Published: January 2016

Fragmentos de carvão vegetal macroscópico foram encontrados em um dos níveis fitofossilíferos do Afloramento Morro Papaléo, Paleozóico Superior (Asseliano/Sakmariano) da porção sul da Bacia do Paraná, Brasil. Foram descritos lenhos carbonizados, associados a dois morfotipos gimnospérmicos vinculados provavelmente a Agathoxylon, o que confirma a ocorrência de paleoincêndios vegetacionais nesta área. A deposição dos carvões vegetais macroscópicos se deu de forma autóctone/parautóctone, o que permite inferir que os paleoincêndios vegetacionais atingiram diretamente a turfeira formadora da camada de carvão e que ocorreram durante uma estação marcadamente seca. Correlações com estudos prévios indicam que os eventos tiveram como provável fonte de ignição atividades vulcânicas. A presença de carvão vegetal macroscópico em sedimentos permianos associados a diferentes níveis em localidades distintas, demonstra que incêndios vegetacionais foram comuns nos ambientes formadores dos depósitos do Paleozóico Superior da Bacia do Paraná.Palavras-chave: carvão vegetal macroscópico; paleoincêndios; Gondwana; Permiano Inferior. ABSTRACT: PALEOBOTANICAL EVIDENCE OF WILDFIRES ON THE MORRO PAPALÉO OUTCROP, LATE PALEOZOIC OF RIO GRANDE DO SUL, BRAZIL. Macroscopic charcoal fragments have been discovered in one of the plant-bearing levels from the Morro Papaléo Outcrop, Late Paleozoic (Asselian/Sakmarian) at the southernmost portion of the Paraná Basin, Brazil. Charred wood associated with two gymnospermic (probably Agathoxylon) morphotypes are described, confirming the occurrence of paleowildfires in this area. The macroscopic charcoal was autochthonously/parautochthonously deposited, allowing infers that the paleowildfires reached the mire which originated the coal layer and occurred during a dry season. Correlations with previous studies indicate that the events could maybe be ignited by volcanic activities. The presence of macroscopic charcoal in Permian sediments associated to different levels and localities, demonstrate that paleowildfires were more or less common in the environments associated with the Late Paleozoic deposits of the Paraná Basin.Keywords: macroscopic charcoal; paleowildfires; Gondwana; Lower Permian.
RETROANÁLISE DE ESCORREGAMENTO DE TALUDE NA ÁREA DE RISCO DO TAQUARIL, BELO HORIZONTE, MG
Authors: Parizzi Maria Giovana , Sobreira Frederico Garcia , Galvão Terezinha Cássia de Brito , Elmiro Marcos Antônio Timbó , Beirigo Elder Antônio 
Published: January 2016

A região do Taquaril em Belo Horizonte abriga mais de 30.000 habitantes adensados em uma pequena área de 145,2 ha. Durante períodos chuvosos, mais de 60% dessa área se enquadra nas categorias de alto risco de escorregamento. Um talude representativo da maioria dos taludes presentes na área foi escolhido para a execução de um estudo de retroanálise de sua estabilidade. Foi observado que, as ações antrópicas, associadas às características geológicas desfavoráveis dos terrenos, são as principais causas dos escorregamentos. O terreno caracteriza-se por encostas bem inclinadas, constituídas por filitos e xistos alterados, cobertos por depósitos de tálus e colúvio inconsolidados. Os depósitos de tálus e colúvio retardam a saturação das descontinuidades dos maciços rochosos e o fator de segurança de rupturas planares e em cunha, nestes casos, é superior a um. A retroanálise apontou baixa resistência para os depósitos de encosta. Pequenas taxas de precipitação podem desencadear escorregamentos de menor volume, mas, durante chuvas intensas, as superfícies de ruptura se tornam mais extensas e profundas, geralmente atingindo o contato entre solo e maciço.Palavras-chave: Retroanálise, escorregamentos, Taquaril. ABSTRACT: SLOPE STABILITY BACK ANALYSIS: A CASE STUDY AT TAQUARIL SLUM, BELO HORIZONTE CITY, BRAZIL. Taquaril risk area is located close to Belo Horizonte city, Brazil. Over 60% of this area was evaluated as being prone to landslides. A representative 25 m slope in this area was chosen to perform a retro-analysis of their stability. It has been observed that antropic actions associated with geological and geomorphological characteristics of the area are the main causes of landslides. Steepy inclined slopes composed by weathered phyllites and schists and also by unconsolidated colluvium and talus deposits characterize the terrain. Topography is being modified and heaps of garbage and waste material from constructions are daily thrown along the slopes and drainages, creating piles of waste deposits placed in unstable conditions. Nowadays shallow landslides are more numerous and dangerous than wedge and planar failures of rock mass, which presents low permeability despite the presence of fractures set. Saturation of the rock mass when covered by slope deposits is difficult to occur and, in this case, the safety factor for wedge or planar failure is up to one. Geotechnical analysis has shown low resistance values for slope deposits. Low precipitation rates may causes shallow slide surfaces, but during intense rain these surfaces are deeper, almost enclosing the rock mass contact.Keywords: retro-analysis, landslides, Taquaril
O SUPERGRUPO RIO DAS VELHAS DA FAIXA MATEUS LEME-PITANGUI - PARTE MERIDIONAL DO CRÁTON DO SÃO FRANCISCO, MG – E SEU SISTEMA DE ALTERAÇÃO HIDROTERMAL
Authors: Romano Antônio Wilson 
Published: January 2016

The studied area is located at the southern São Francisco Craton, between the northwest comer of the Quadrilátero Ferrífero and the Upper Proterozoic Bambui basin. The region comprises Archaean granite-gneisses and two supracrustal sequences: a) The Archaean Rio das Velhas Supergroup, which consists of a thick sequence of a greenstones associated with metamorphic felsic volcanites, volcano-clastic and sedimentary rocks; and b) the overlying Early Proterozoic Minas Supergroup with its widespread banded iron formations.Two major deformational events are present. The oldest Dn event can be detected only in the Rio das Velhas rocks and produced large folds with mainly E-W trending axis. The latter Dn+1 of Transamazonian age (±2,0 Ga) is a progressive deformational event, that has also affected the Minas Supergroup. It produces NW-SE to NE-SW folds associated to conspicuous planar and linear structures. This event envolved to a NW-vergent thurst system with the development of a strong stretch lineation. This event also produced strike-slip faults interpreted as tear-faults parallel to the direction of the thrusts.This paper deals with the large hydrothermal alteration which has affected the lower volcanoclastics rocks of the Rio das Velhas Supergroup. This alteration has been produced by a solfataric hydrothermal system in mesothermal P-T conditions. It produced a high aluminium mineralogical assemblage of corundum, kyanite (minor andaluzite) and muscovite. This mineralogy is latter retrograde altered to diaspore, pyrophyllite, kaolinite. Minor amounts of tourmaline, rutile, chloritoid are also present. A hydrothermal zoning with three major subdivisions is proposed as follows: high aluminium zone, sericitic (muscovitic) zone and propilitic zone. Some cristallochemical aspects of the mineralogical phases are discussed, and also the origin of the protolite and the relationship between alteration and deformatiom. The hydrothermal system has evolved under pre to syn tectonic conditions during the Archean Dn tectonism.For this event, a model of collisional tectonics is also proposed for the area, as the Rio das Velhas Supergroup represents a former continental back-arc basin.
MAPEAMENTO GEOLÓGICO DA REGIÃO DA SERRA DOS TURVOS, CARATINGA (MG), SETOR SUL DO ORÓGENO ARAÇUAÍ
Authors: Queiroga Gláucia , Novo Tiago , Pedrosa-Soares A. C. 
Published: January 2016

A área de estudo situa-se na parte sul do núcleo cristalino do Orógeno Araçuaí, próximo à fronteira com o Orógeno Ribeira. A característica fundamental da região é a abundância de rochas de alto grau metamórfico, na transição de fácies anfibolito-granulito. Uma cobertura metassedimentar neoproterozóica é a unidade dominante e está representada por paragnaisse migmatítico, bandado, com intercalações de quartzito, formação ferrífera micácea e formação ferrífera maciça. Corpos de anfibolito, pegmatito e charnockito também ocorrem na área. A principal estrutura dúctil é a foliação (Sn) regional, paralela ao bandamento composicional do granada-biotita paragnaisse. Fraturas são abundantes no quartzito e formação ferrífera maciça. As formações ferríferas são ricas em magnetita e formam corpos lenticulares com espessura decamétrica a centimétrica, concordantes com o bandamento composicional do granada-biotita paragnaisse. Preliminarmente, interpreta-se a gênese dessas formações ferríferas como sedimentar, durante a deposição dos protolitos areno-pelíticos do paragnaisse.Palavras-chave: metamorfismo de alto grau, formação ferrífera, Orógeno Araçuaí. ABSTRACT: GEOLOGICAL MAPPING OF THE SERRA DOS TURVOS REGION, CARATINGA (MG), SOUTHERN SECTION OF THE ARAÇUAÍ OROGEN. The study area is located in the southern part of the crystalline core of the Araçuaí orogen, close to the boundary with the Ribeira orogen. The main feature of the region is the abundance of high-grade metamorphic rocks of the amphibolite-granulite facies transition. A Neoproterozoic sedimentary cover is the dominant unit in the area and consists of migmatitic banded paragneiss with intercalations of quartzite, mica-bearing iron formation and massive iron formation. Amphibolite, pegmatite and charnockite bodies are also found in the area. The main ductile structure is the regional foliation (Sn) which is parallel to the compositional banding of the garnet-biotite paragneiss. Fractures are abundant in the quartzite and massive iron formation. The iron formations form lenticular bodies ranging in thickness from centimeters to decameters, which are concordant to the banding and foliation of the garnet-biotite paragneiss. Accordingly to field data, a sedimentary genesis can be suggested for the iron formations.Keywords: high grade metamorphism, iron formation, Araçuaí Orogen
ANÁLISE DE ELEMENTOS DA DIVERSIDADE NATURAL NA PROPOSIÇÃO DE CONECTIVIDADE DE HABITATS DA PORÇÃO SUDESTE DO QUADRILÁTERO FERRÍFERO, MINAS GERAIS
Authors: Campos Rachel Rodrigues de , Azevedo Úrsula Ruchkys de , Vasconcelos Marcelo Ferreira de 
Published: January 2016

O Quadrilátero Ferrífero é internacionalmente conhecido por seus recursos minerais, principalmente, o ouro e o ferro e por suarica diversidade natural. As atividades minerárias, juntamente a expansão urbana, bem como outras atividades antrópicas, têm acentuadoe acelerado o processo de fragmentação de habitats nesta região. Neste contexto este estudo apresenta uma proposta para conexão deunidades de conservação na porção sudeste do Quadrilátero Ferrífero utilizando análise multicritério tendo como variáveis elementos dageodiversidade, como unidades geológicas e hidrografia, assim como da biodiversidade, incluindo fitofisionomias vegetais e áreas depossível ocorrência de três espécies de avifauna (Passeriformes) quase endêmicas de campos rupestres. Os resultados permitiram verificare comparar a importância dos elementos da biodiversidade e da geodiversidade na conectividade para a área de estudo.Palavras-chave: Diversidade natural. Biodiversidade. Geodiversidade. Conectividade. Quadrilátero Ferrífero. ABSTRACTANALYSIS OF ELEMENTS OF NATURAL DIVERSITY IN THE PROPOSITION OF HABITAT CONNECTIVITY OF THE SOUTHEASTERNPORTION OF THE QUADRILATERO FERRIFERO, MINAS GERAIS, BRAZIL. The Quadrilatero Ferrifero is internationally known for its mineralresources, primarily gold and iron and its rich natural diversity. The mining activities along with urban sprawl have led to fragmentation ofhabitat in this region. In this context, this paper presents a proposal for connecting protected areas in the southeastern portion of theQuadrilatero by using multicriteria analysis as variable elements of geodiversity as geological units and hydrology, and biodiversity,including plant vegetation types and areas of possible occurrence of three species of birds (Passeriformes) almost endemic from rockyfields of the region. The results allowed to showed the importance and compare the elements of biodiversity and geodiversity in theconnectivity for the study area.Keywords: Natural Diversity. Biodiversity. Geodiversity. Connectivity. Quadrilatero Ferrifero.
HOMENAGEM AO PROF. CORREIA NEVES
Authors: CPMTC-IGC-UFMG Diretor do 
Published: January 2016

Este volume de Geonomos é dedicado ao cientista que pavimentou a estrada da pesquisa científica em Geologia no Instituto de Geociências da Universidade Federal de Minas Gerais, pregando a necessidade da permanente geração de conhecimento, estruturando equipes e realizando projetos, cavando recursos e formando pesquisadores criando o Centro de Pesquisa Professor Manoel Teixeira da Costa e o Curso de Mestrado em Geologia. Este cientista se chama Professor Correia Neves.[...]Prof.Antônio Carlos Pedrosa-SoaresDiretor do CPMTC-IGC-UFMG
Detecting Fracture Growth Out of Zone by Use of Temperature Analysis
Authors: Ribeiro Priscila M. , Horne Roland N. 
Published: January 2016

Summary
Hydraulic fracturing is a widely applied well-stimulation technique. Recently, the application of multiple hydraulic fractures along horizontal wells has made possible the exploitation of unconventional reservoirs, such as shale gas and shale oil. However, the process of horizontal-well fracturing is uncertain and it is not fully understood yet. There exist many questions about the number and position of created fractures and whether the fracture stays contained within the main reservoir thickness.
This work presents the modeling and analysis of temperature data during and after the creation of multiple fractures along a horizontal well. Our model accounts for fracture growth and closure, the well effects, and interaction between multiple fractures.
The interference between multiple fractures growing simultaneously and the presence of reservoir-permeability heterogeneity were investigated. Capabilities and limitations of information carried by temperature data are presented through different geometry analyses.
A special consideration of fracture growth out of zone was addressed. For this case, it was considered that one of the hydraulic fractures activates a pre-existing fault and interconnects the reservoir with other zones hundreds of feet away.
Our work shows the advantage of the use of continuous-distributed-temperature data in comparison with the traditional single-point-pressure analysis. The local characteristic of temperature allows us to identify not only which of the created hydraulic fractures has interconnected the main reservoir with a different zone, but also the location of this zone. We also account for the effect of the interconnection on the growth of the other hydraulic fractures along the horizontal wellbore.
The simultaneous multiple fracture growth shows that falloff-distributed-temperature data can predict the number of created fractures. More than that, in the presence of heterogeneity, the interaction between the contained fractures can be captured by the temperature analysis. Different from the pressure analysis, distributed-temperature data can differentiate between heterogeneity locations along the wellbore.
Throughout this study, we present a series of examples in which the temperature can provide information that would not be obtained from the traditional pressure analysis.
Modeling Gas Adsorption in Marcellus Shale With Langmuir and BET Isotherms
Authors: Yu Wei , Sepehrnoori Kamy , Patzek Tadeusz W. 
Published: January 2016

SummaryProduction from shale-gas reservoirs plays an important role in natural-gas supply in the United States. Horizontal drilling and multistage hydraulic fracturing are the two key enabling technologies for the economic development of these shale-gas reservoirs. It is believed that gas in shale reservoirs is mainly composed of free gas within fractures and pores and adsorbed gas in organic matter (kerogen). It is generally assumed in the literature that the monolayer Langmuir isotherm describes gas-adsorption behavior in shale-gas reservoirs. However, in this work, we analyzed four experimental measurements of methane adsorption from the Marcellus Shale core samples that deviate from the Langmuir isotherm, but obey the Brunauer-Emmett-Teller (BET) isotherm. To the best of our knowledge, it is the first time to find that methane adsorption in a shale-gas reservoir behaves similar to multilayer adsorption. Consequently, investigation of this specific gas-desorption effect is important for accurate evaluation of well performance and completion effectiveness in shale-gas reservoirs on the basis of the BET isotherm. The difference in calculating original gas in place (OGIP) on the basis of both isotherms is discussed. We also performed history matching with one production well from the Marcellus Shale and evaluated the contribution of gas desorption to the well's performance. History matching shows that gas adsorption obeying the BET isotherm contributes more to overall gas recovery than gas adsorption obeying the Langmuir isotherm, especially at early time in production. This work provides better understanding of gas desorption in shale-gas reservoirs and updates our current analytical and numerical models for simulation of shale-gas production.