Magnetic-structural framework and gamma-ray spectrometry of the Brusque region, Santa Catarina State, Southern Brazil

2017 ◽  
Author(s):  
Vinicius Antunes Ferreira da Silva ◽  
Francisco José Fonseca Ferreira*
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Spectrometry ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Structural Framework ◽  
Santa Catarina State

Geophysical-structural framework of the Campo Alegre basin (Santa Catarina State, southern Brazil)

2020 ◽  
Vol 183 ◽  
pp. 104189
Author(s):  
Renata Ribas Zanella ◽  
Barbara Trzaskos ◽  
Luís Gustavo de Castro ◽  
Francisco José Fonseca Ferreira
Keyword(s):  
Southern Brazil ◽  
Santa Catarina ◽  
Structural Framework ◽  
Santa Catarina State

scholarly journals RECOGNITION OF GOLD MINERALIZATION FAVORABILITY ZONES THROUGH AIRBORNE GAMMA-RAY SPECTROMETRY AND MAGNETOMETRY IN BRUSQUE AND BOTUVERÁ REGION, SOUTHERN BRAZIL

2018 ◽  
Vol 36 (3) ◽  
pp. 1 ◽  
Author(s):  
Bruno Macchioni Pereira ◽  
Francisco Jose Fonseca Ferreira
Keyword(s):  
Hydrothermal Alteration ◽  
Gamma Ray ◽  
Gold Mineralization ◽  
Shear Zones ◽  
Magnetic Data ◽  
Gamma Ray Spectrometry ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Index Overlay ◽  
Primary Gold

ABSTRACT. The northeastern portion of Santa Catarina State, southern Brazil, bears important primary gold mineralization associated with granitic intrusions with potassic and phyllic hydrothermal alteration zones and a phase shear zone reactivation. Airborne radiometric and magnetic data were applied in the study area through the use of gamma-ray spectrometry (Total Count, K, eTh and eU) and suggestive parameters of hydrothermal alteration as Kd, Ud and F, in association with geological units, while magnetometry (RTP, THDR, TDR and Signum Transform) was applied in the definition of the structural framework. Geophysical data was interpreted and integrated to geological information, such as lithologic units, structures, shear zones and gold mineralization, using the knowledge driven and index overlay methods in order to define favorable targets. The geophysical and geological data exhibit good correlation, as seen in the gamma-ray spectrometric domains and magnetic lineaments, and the favorability map shows important target areas for primary gold mineralization. It was possible to observe in the geophysical maps that shear zones and faults have more influence in the occurrences than potassic and phyllic hydrothermal alteration related to granitic intrusions.Keywords: geophysical exploration, knowledge-driven, Dom Feliciano Belt.RESUMO. A porção nordeste do estado de Santa Catarina, sul do Brasil, possui importantes mineralizações auríferas primárias associadas a intrusões graníticas com zonas de alteração hidrotermal potássica e fílica e posterior fase de reativação de zonas de cisalhamento. Dados radiométricos e magnéticos aerogeofísicos foram aplicados na área de estudo através do uso de gamaespectrometria (Contagem Total, K, eTh e eU) e parâmetros sugestivos de alteração hidrotermal como Kd, Ud e Parâmetro F. Em associação com unidades geológicas, enquanto a magnetometria (RTP, GHT, ISA e Signum Transform) foi aplicada na definição do arcabouço estrutural. Os dados geofísicos foram interpretados e integrados às informações geológicas, como unidades litológicas, estruturas, zonas de cisalhamento e mineralizações de ouro, utilizando os métodos knowledge-driven e index overlay para definir alvos favoráveis. Os dados geofísicos e geológicos apresentam boa correlação, como visto nos domínios espectrométricos de raios gama e lineamentos magnéticos, e o mapa de favorabilidade mostra áreas-alvo importantes para a mineralização de ouro primária. Foi possível observar nos mapas geofísicos que as zonas de cisalhamento e as falhas têm mais influência nas ocorrências do que as zonas de alteração hidrotermal potássica e fílica relacionada às intrusões graníticas.Palavras-chave: exploração geofísica, knowledge-driven, Cinturão Dom Feliciano.

Valeriana iganciana (Valerianaceae), a new species from the highland grasslands of Serra do Tabuleiro, Santa Catarina, Brazil

Phytotaxa ◽  
2018 ◽  
Vol 364 (3) ◽  
pp. 275
Author(s):  
CASSIO RABUSKE DA SILVA ◽  
JOSIMAR KÜLKAMP
Keyword(s):  
New Species ◽  
Endemic Species ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Entire Margin ◽  
A New Species ◽  
Santa Catarina State

Valeriana iganciana, an endemic species from the Serra do Tabuleiro highlands of Santa Catarina state, southern Brazil, is described and illustrated. The new species shares morphological affinities with V. ulei, from which it is distinguished mainly by leaves with entire margin, by the cymose architecture of the inflorescence and by the triquetrous and elliptical fruits with annular to dentate calyx.

scholarly journals CONTROL OF GRAPEVINE DECLINE WITH THE USE OF DRAINS AND RIDGES

2016 ◽  
Vol 38 (2) ◽  
Author(s):  
REMI NATALIN DAMBROS ◽  
MARCO ANTONIO DALBÓ ◽  
CRISTIANO JOÃO ARIOLI ◽  
MILTON DA VEIGA
Keyword(s):  
Soil Fungi ◽  
Clay Content ◽  
Field Studies ◽  
Soil Characteristics ◽  
Southern Brazil ◽  
Plant Mortality ◽  
Drastic Reduction ◽  
Santa Catarina ◽  
Grapevine Decline ◽  
Santa Catarina State

ABSTRACT The incidence of grapevine decline and dye back is quite severe in grapevine-growing regions of southern Brazil, especially in the Midwest of Santa Catarina State. Field studies on problematic areas identified the presence of the Brazilian ground pearl or margarodes (Eurhizococcus brasiliensis Hempel) and soil fungi (Cylindrocarpon, Fusarium and others) associated with the disease. Soil characteristics such as high clay content and poor aeration were associated with the problem. To evaluate the effect of pre-planting tillage in reducing the incidence of grapevine decline, an experiment was carried out with two rootstocks and three pre-planting tillage (regular plowing, drains, and ridges) in an area where high plant mortality had been previously observed. Pre-planting tillage with the use of ridges along the rows gave the best results with a drastic reduction in the decline incidence. The number of ground pearl cysts was unaffected by pre-planting tillage and did not relate with the incidence of decline and death of plants.

scholarly journals Southernmost records of Pachyramphus marginatus (Passeriformes: Tityridae) and first observation for Santa Catarina State, southern Brazil

Biotemas ◽  
2021 ◽  
Vol 34 (3) ◽  
pp. 1-5
Author(s):  
Fernando Bittencourt de Farias ◽  
Guilherme Willrich ◽  
Guilherme Renzo Rocha Brito
Keyword(s):  
Atlantic Forest ◽  
Adult Male ◽  
Protected Area ◽  
Distribution Range ◽  
Southern Brazil ◽  
Santa Catarina ◽  
The Creation ◽  
Northeastern Coast ◽  
Santa Catarina State ◽  
Geographically Isolated

The Black-capped Becard (Pachyramphus marginatus) has two geographically isolated subspecies, including the Atlantic Forest subspecies that is distributed from Pernambuco State to Paraná State. Here we report the first observation of the species in Santa Catarina State, southern Brazil. On 12 November 2019 an adult male of P. marginatus was observed in the municipality of São Francisco do Sul, on the northeastern coast of Santa Catarina, during an inventory for the creation of a protected area. The species was also observed on three other occasions in the same locality. These are the first known records for Santa Catarina and extend the known distribution range of this species 40 km southward. We also discuss some explanations for the records.

Perlidae (Plecoptera) from Southeastern Santa Catarina State, Southern Brazil

Zootaxa ◽  
2014 ◽  
Vol 3779 (2) ◽  
pp. 277 ◽  
Author(s):  
MARCOS CARNEIRO NOVAES ◽  
PITÁGORAS DA CONCEIÇÃO BISPO
Keyword(s):  
Southern Brazil ◽  
Santa Catarina ◽  
Santa Catarina State

Polychaetes from Santa Catarina State (southern Brazil): checklist and remarks on species distribution

Zootaxa ◽  
2012 ◽  
Vol 3486 (1) ◽  
pp. 1 ◽  
Author(s):  
PAULO ROBERTO PAGLIOSA ◽  
JOÃO GABRIEL DORIA ◽  
GIORGIA FREITAS ALVES ◽  
TITO CESAR MARQUES DE ALMEIDA ◽  
LUCIANO LORENZI ◽  
...  
Keyword(s):  
Species Distribution ◽  
New Records ◽  
Progressive Increase ◽  
Water Masses ◽  
Valid Species ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Rarefaction Curves ◽  
Occurrence Of Species ◽  
Santa Catarina State

This study summarizes taxonomic information on polychaetes from Santa Catarina State, southern Brazil, between25º57'S and 29º23'S, and provides species distribution records together with information on habitats, based on historicaldata and novel records from primary surveys. Rarefaction curves showed that most species were found in the shallowsublittoral (to 60 m) rather than in deep sublittoral (>60 m) or estuarine habitats. Altogether, 228 valid species belongingto 141 genera and 44 families were recorded. This inventory adds 141 new records to previous regional reports. We founda shift in occurrence of species when comparing data from the study area with data from both southward (29–33º S) andnorthward (23–26º S) sites. Few species were shared between consecutive sites: this could be a response to the regionalbehaviour of the atmosphere and water masses, with a progressive increase in the influence of subantarctic waters and a decrease in the influence of subtropical waters.

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