Geometria do Sinclinal Gandarela baseada na deconvolução Euler 2D e 3D: quadrilátero ferrífero (MG)

Oliveira, Natália Valadares de; Endo, Issamu; Oliveira, Luiz Gabriel Souza de

doi:10.1590/s0102-261x2005000300002

Cited by 6 publications

(5 citation statements)

References 6 publications

(11 reference statements)

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“…Various mountain lakes are found in the region of Minas Gerais State known as the Iron Quadrangle (Oliveira et al 2005), a region known nationally and internationally for its great mineral deposits. On account of the mining activity, the shallow lakes located in areas with outcrops of iron ore are viewed as critically threatened ecosystems (Carmo et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Composition, Body-Size Structure and Biomass of Zooplankton in a High-Elevation Temporary Pond (Minas Gerais, Brazil)

et al. 2016

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Small ponds are vital inland water bodies, recognized as small repositories of freshwater biodiversity, but neglected in terms of conservation. Although high-elevation ponds are difficult to sample and monitor, it is important to extend their study, in view of their importance to aquatic biodiversity. The aim of this study was to analyze the composition, size structure biomass and diversity of zooplankton community in a temporary pond (Lagoa Seca) of a low-alpine area in the southern part of Serra do Espinhaço mountain in Minas Gerais State, Brazil. Three ecological aspects were analyzed: (I) the taxonomic composition of the zooplankton assemblage, (II) the size structure and biomass of the main groups in the zooplankton community and (III) whether the morphometric characteristics and biomass of the zooplankton result from the dominance of the microzooplankton, as expected in habitats subjected to frequent and strong disturbances, such as temporary ponds. Zooplankton samples were taken during the rainy period (October 2010 to January 2011) in different mesohabitats, from the shallowest areas covered by emergent macrophytes to the open water area covered mainly by submerged macrophytes. The zooplankton community consisted of a small number of taxa (29). Rotifera showed the highest richness, with 21 taxa recorded, of which the most constant species were the cosmopolitan Lecane lunaris, L. obtusa and Lepadella patella. Among the Cladocera, Bosmina freyi and Moina minuta were the pelagic species recorded. The other cladoceran species observed are associated with littoral vegetation, and represented mainly by Alona ossiani, Chydorus pubescens, Ephemeroporus tridentatus and Ilyocryptus spinifer. The zooplankton biomass was very low (the maximum dry weight, observed at the peak of the rainy period in January was 62 µg.m-3). The zooplankton community was dominated by the microzooplankton, with the maximum body length below 900 µm. This assemblage was very changeable in the short term, both in numerical density and size structure, probably because of the highly variable hydrological regime of the pond. The results from zooplankton composition, including the first record of the rotifer Microcodon clavus to Minas Gerais state and the second in Brazil, highlighted the important role that high-elevation temporary ponds can play as aquatic biodiversity reserves. These unique ecosystems deserve greater efforts of research and monitoring, including studies of their hydrological patterns, biological diversity, and adaptive mechanisms of the zooplankton community.

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Section: Introductionmentioning

confidence: 99%

Composition, Body-Size Structure and Biomass of Zooplankton in a High-Elevation Temporary Pond (Minas Gerais, Brazil)

et al. 2016

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“…The Euler 2D deconvolution algorithm was developed with the purpose of estimating depths of magnetic sources or magnetic bodies (Oliveira et al, 2005). Developed by Thompson (1982), this technique is based on the homogeneous differential equation of Euler (Equation 1), considering the cartesian coordinates x, y, z and the function described by T (x, y, z).…”

Section: Methodsmentioning

confidence: 99%

Application of the Euler deconvolution 2D and 3D at the Pari syncline, internal area of the Paraguay Belt, Mato Grosso, Brazil

Iocca

Fachin

2021

Geol. USP. Sér. Cient.

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Among the several techniques that allow the estimation of mean depths from airborne geophysical magnetic data, the Euler deconvolution became popular due to the high level of reliability in the generated data. With the use of this tool, it is possible to study structures remotely at different crustal levels that may or may not contain mineralization, consequently being able to determine potential targets for mineral exploration or to study better its relation with the structural background. With the analysis of the magnetic susceptibility of subsurface and the inversion profiles of the magnetic data (Euler deconvolution 2D) were interpolate a 3D model of the region, that allowed to generate a descriptive suggestion of the geometry of the Pari syncline, located in the Cuiabá Group, in the northwestern portion of the Paraguay belt. It has a strong structural control in the context of the Pari River basin and a great auriferous potential, as evidenced by updated research and exploration data. The data applied in this paper were extract from the Cuiabá aerogeophysical project and previous mappings and have their mean depths correlated with the Cuiabá group.

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“…The Curral anticline materializes the hinge area of the Curral nappe, an allochthonous recumbent megafold represented by the joint of the Serra do Curral and the Moeda syncline. The anticline's axial plane is oriented following 120/30 (Endo et al 2020) and its inverted flap (Oliveira 2005) constitutes the Curral homocline, northwest of the study area.…”

Section: Lineaments and Regional Structuresmentioning

confidence: 99%

Remote sensing applied to geological, structural, and mass movements characterization in the connection between Curral Homocline and Moeda Syncline, Quadrilátero Ferrífero Region, Brazil

Roncato¹,

Martins²,

Silva³

2023

Braz. J. Geol.

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Mass movements naturally occurring along slopes, especially after heavy rains, cause heavy losses of materials and life and affect highways, pipelines, and bridges, among other structures. Among the most common mass movements, landslides and subsequent mass flows especially stand out. Remote sensing and geoprocessing techniques are useful tools for geological and geotechnical analysis, here applied to characterization of mass movements from the analysis of the influence of slopes, lineaments or fractures, and geological-geotechnical at the junction of the Curral homocline and the Moeda syncline, Quadrilátero Ferrífero, Southeast Brazil. The area consists of Archean granitic-gneissic basement and the greenstone belt sequence of the Rio das Velhas Supergroup with Proterozoic metasedimentary rocks of the Minas Supergroup covering these two older successions. Based on satellite images, a preliminary map of lineaments was created, and fractures were grouped according to their direction before being rasterized. Each lineament group was associated with a previously known geological and/or structural feature. Geological units mapped in the area were numerically classified according to their mass movement susceptibility and related geotechnical units. Using a Shuttle Radar Topography Mission (SRTM) image, a terrain slope raster was generated. The objective was to obtain a raster indicating low and high probabilities of mass movements. Four sets of lineaments were identified: the first set associated with the northeast strike stratification of the rocks of the Moeda Formation; the second set related to eastward-trending warp axis lineations; the third set related to the southeast trend of stretch lineaments or mafic dykes directions; and the fourth set evidently associated with the watershed pattern of the Curral Range crest, perpendicular to the strike of the rocks in the area. Simulations with different combinations of parameters produced eight scenarios were generated were constructed to classify the area as to its susceptibility to rupture through changes in slope, lithotype, and lineament density; the first four (1 to 4) were classified by using the slope percentage raster without interval reclassification, so its values in the cartographic algebra were not grouped. The last for (5 to 8), consider the slope percentage classified. This methodology successfully combines mathematical models for predicting mass movements and determining areas in the urban landscape most susceptible to these phenomena. As such, it comprises a useful tool for government planning of preventative actions for areas of high risk.

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Geometria do Sinclinal Gandarela baseada na deconvolução Euler 2D e 3D: quadrilátero ferrífero (MG)

Cited by 6 publications

References 6 publications

Composition, Body-Size Structure and Biomass of Zooplankton in a High-Elevation Temporary Pond (Minas Gerais, Brazil)

Composition, Body-Size Structure and Biomass of Zooplankton in a High-Elevation Temporary Pond (Minas Gerais, Brazil)

Application of the Euler deconvolution 2D and 3D at the Pari syncline, internal area of the Paraguay Belt, Mato Grosso, Brazil

Remote sensing applied to geological, structural, and mass movements characterization in the connection between Curral Homocline and Moeda Syncline, Quadrilátero Ferrífero Region, Brazil

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