Unraveling sedimentary precursors and metal enrichment of high-grade metamorphosed manganese-rich rocks from the Borborema Province, northeastern Brazil

2021 ◽  
pp. 104283
Author(s):  
Felipe Holanda dos Santos ◽  
Wagner da Silva Amaral ◽  
Kurt Konhauser ◽  
Douglas Teixeira Martins ◽  
Marco Paulo de Castro ◽  
...  
Keyword(s):  
Northeastern Brazil ◽  
High Grade ◽  
Metal Enrichment ◽  
Borborema Province

scholarly journals Lithospheric and sublithospheric deformation under the Borborema Province of northeastern Brazil from receiver function harmonic stripping

Solid Earth ◽  
2019 ◽  
Vol 10 (3) ◽  
pp. 893-905 ◽  
Author(s):  
Gaelle Lamarque ◽  
Jordi Julià
Keyword(s):  
Lithospheric Mantle ◽  
Seismic Anisotropy ◽  
Receiver Function ◽  
Seismic Station ◽  
Atlantic Coast ◽  
Shear Zones ◽  
Receiver Functions ◽  
Azimuthal Anisotropy ◽  
Northeastern Brazil ◽  
Borborema Province

Abstract. The depth-dependent anisotropic structure of the lithosphere under the Borborema Province in northeast Brazil has been investigated via harmonic stripping of receiver functions developed at 39 stations in the region. This method retrieves the first (k=1) and second (k=2) degree harmonics of a receiver function dataset, which characterize seismic anisotropy beneath a seismic station. Anisotropic fabrics are in turn directly related to the deformation of the lithosphere from past and current tectonic processes. Our results reveal the presence of anisotropy within the crust and the lithospheric mantle throughout the entire province. Most stations in the continental interior report consistent anisotropic orientations in the crust and lithospheric mantle, suggesting a dominant northeast–southwest pervasive deformation along lithospheric-scale shear zones developed during the Brasiliano–Pan-African orogeny. Several stations aligned along a northeast–southwest trend located above the (now aborted) Mesozoic Cariri–Potiguar rift display large uncertainties for the fast-axis direction. This non-azimuthal anisotropy may be related to a complex anisotropic fabric resulting from a combination of deformation along the ancient collision between Precambrian blocks, Mesozoic extension and thermomechanical erosion dragging by sublithospheric flow. Finally, several stations along the Atlantic coast reveal depth-dependent anisotropic orientations roughly (sub)perpendicular to the margin. These results suggest a more recent overprint, probably related to the presence of frozen anisotropy in the lithosphere due to stretching and rifting during the opening of the South Atlantic.

scholarly journals Management of Atypical Squamous Cell Cases: A Prospective Study of Women seen at a Private Health Service in Northeastern Brazil

2018 ◽  
Vol 40 (03) ◽  
pp. 121-126 ◽  
Author(s):  
Geilson Oliveira ◽  
Judite Oliveira ◽  
Renata Eleutério ◽  
José Eleutério Júnior
Keyword(s):  
Northeastern Brazil ◽  
National Guideline ◽  
High Grade ◽  
Squamous Intraepithelial Lesion ◽  
National Guidelines ◽  
Squamous Cells ◽  
Negative Results ◽  
Hpv Test ◽  
Intraepithelial Lesion

Objective To assess the management chosen by gynecologists after atypical squamous cells (ASCs) cytology results, and to evaluate the outcomes of these cases in Brazilian women. Methods A prospective observational study evaluated the initial management offered by the gynecologist in the case of 2,458 ASCs cytology results collected between January of 2010 and July of 2016. The outcomes of the cytology, high-risk human papilloma virus (HR-HPV) test and histology were compared in two subgroups: atypical squamous cells of undetermined significance (ASC-US) and atypical squamous cells-cannot exclude high-grade squamous intraepithelial lesion (ASC-H). Results In many cases of ASC-US (36.97%) and ASC-H (40.50%), no clinical actions were taken. Cytology was the most frequent follow-up chosen, including for cases of ASC-H, which goes against the conduct recommended in the national guideline. In women over 30 years of age, the period of time elapsed between an ASC-US result and a new cytology was in 13.03 months, in disagreement with the national guideline recommendations (p < 0.0001). Negative for intraepithelial lesions or malignancy (NILM) cytologic (p = 0.0026) and histologic (p = 0.0017) results in the follow-up were associated with prior ASC-US, while negative results for ASC-H were cytologically (p < 0.0001) and histologically associated with high-grade squamous intraepithelial lesion (HSIL) (p < 0.0001). Two invasive cervical carcinomas (ICCs) were found in the follow-up for ASC-H, and there was a statistically significant association (p = 0.0341). A positive HR-HPV test was associated with ASC-H (p = 0.0075). Conclusion The data suggest that even for a population of Brazilian women assisted at private clinics, the national guidelines recommendations for ASCs results are not followed.

Isotope geochemistry of Paleoproterozoic metacarbonates from Itatuba, Borborema Province, Northeastern Brazil: Evidence of marble melting within a collisional suture

2013 ◽  
Vol 23 (1) ◽  
pp. 380-389 ◽  
Author(s):  
Roberto Ventura Santos ◽  
Edilton J. dos Santos ◽  
João Adauto de Souza Neto ◽  
Luis Christian Montreuil Carmona ◽  
Alcides Nóbrega Sial ◽  
...  
Keyword(s):  
Isotope Geochemistry ◽  
Northeastern Brazil ◽  
Borborema Province

scholarly journals MONITORING OF CERVICAL CANCER CONTROL ACTIONS AND ASSOCIATED FACTORS

2021 ◽  
Vol 30 ◽  
Author(s):  
Eduarda Ferreira dos Anjos ◽  
Poliana Cardoso Martins ◽  
Nília Maria Brito de Lima Prado ◽  
Vanessa Moraes Bezerra ◽  
Patty Fidelis de Almeida ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Family Health ◽  
Cancer Control ◽  
Northeastern Brazil ◽  
High Grade ◽  
Cross Sectional ◽  
Health Region ◽  
Health Strategy ◽  
The Family ◽  
Family Health Strategy

ABSTRACT Objective: to analyze factors associated with the monitoring of actions to control cervical cancer in the Family Health Strategy, in a health region of northeastern Brazil. Method: a cross-sectional study conducted from January to March 2019 by means of interviews with 241 physicians and nurses from the Family Health Teams of the Vitória da Conquista health region, Bahia, Brazil. Adequate monitoring was assessed by the degree of actions taken to promote, prevent and actively seek to control cervical cancer. Three blocks of variables were tested as explanatory: professional characterization and training; organization of the unit and access to cytopathological exam; and care coordination and integration. Poisson regression with robust variance was employed, adopting hierarchical entry of variables. Results: 51.9% (95% CI: 45.5-58.2) of the professionals performed adequate monitoring for the control of cervical cancer. Being a nurse, working in the municipality’s primary care network (≥2 years), disclosure of results collection through posters and other communication means, existence of a high-grade lesion, time to perform the biopsy ≤1 month, and agility in the release of the reports were elements associated to the outcome. Conclusion: even with the extended coverage of the Family Health Strategy, small municipalities in the Northeast have characteristics that impose obstacles to comprehensiveness, favoring the incidence of high-grade lesions and greater difficulty in the control of cervical cancer. Assessing the assistance quality in this level revealed challenges in the regionalized network.

Electromagnetic Induction Studies in the Borborema Province and Adjacent Terrains, Northeastern Brazil: 2013-INCTET Progress Report

2013 ◽  
Author(s):  
Ícaro Vitorello ◽  
Antonio L. Padilha ◽  
A.C.L. Santos ◽  
Marcelo B. de Pádua ◽  
Sérgio L. Fontes ◽  
...  
Keyword(s):  
Electromagnetic Induction ◽  
Progress Report ◽  
Northeastern Brazil ◽  
Borborema Province

Intralithospheric differentiation and crustal growth: Evidence from the Borborema province, northeastern Brazil

Geology ◽  
2000 ◽  
Vol 28 (6) ◽  
pp. 519 ◽  
Author(s):  
Sérgio P. Neves ◽  
Gorki Mariano ◽  
Ignez P. Guimarães ◽  
Adejardo F. da Silva Filho ◽  
Silvana C. Melo
Keyword(s):  
Northeastern Brazil ◽  
Crustal Growth ◽  
Borborema Province

Magnetotelluric evidence for a Rhyacian suture zone hidden underneath the Seridó belt, Borborema Province, Northeastern Brazil

2021 ◽  
Vol 365 ◽  
pp. 106413
Author(s):  
Antonio L. Padilha ◽  
Andrea C.L. Santos-Matos ◽  
Joelson C. Batista ◽  
Ícaro Vitorello ◽  
Marcelo B. Pádua ◽  
...  
Keyword(s):  
Suture Zone ◽  
Northeastern Brazil ◽  
Borborema Province

Textural Characteristics of Barren and Mineralized Colloform Quartz Bands at the Low-Sulfidation Epithermal Deposits of the Omu Camp in Hokkaido, Japan: Implications for Processes Resulting in Bonanza-Grade Precious Metal Enrichment

2020 ◽  
Author(s):  
Lauren R. Zeeck ◽  
Thomas Monecke ◽  
T. James Reynolds ◽  
Erik R. Tharalson ◽  
Katharina Pfaff ◽  
...  
Keyword(s):  
Precious Metal ◽  
Precious Metals ◽  
High Grade ◽  
Metal Enrichment ◽  
Near Surface ◽  
Epithermal Deposits ◽  
Fine Grained ◽  
Precursor Phase ◽  
Ore Minerals ◽  
Low Sulfidation

Abstract The Miocene low-sulfidation epithermal deposits of the Omu camp in northeastern Hokkaido, Japan, are small past-producers of precious metals and represent significant exploration targets for high-grade Au and Ag ores. The quartz textures of ore samples and the distribution of ore minerals within quartz veins were studied to identify the processes that resulted in the bonanza-grade precious metal enrichment in these deposits. In the high-grade vein samples, which are crustiform or brecciated in hand specimen, ore minerals exclusively occur within colloform quartz bands. High-magnification microscopy reveals that ore-bearing colloform bands consist of fine-grained quartz exhibiting relic microsphere textures and quartz having a mosaic texture that formed through recrystallization of the microspheres. The presence of relic microspheres is evidence that the microcrystalline quartz hosting the ore minerals formed through recrystallization of a noncrystalline silica precursor phase. The ore-hosting colloform bands composed of agglomerated microspheres alternate with barren colloform quartz bands that are composed of fibrous chalcedonic quartz and mosaic quartz formed through recrystallization of the chalcedony. The findings of this study are consistent with previous models linking bonanza-grade precious metal enrichment and the formation of bands of noncrystalline silica in low-sulfidation epithermal veins to episodic vigorous boiling or flashing of the hydrothermal system in the near-surface environment.

The unregenerate São Rafael pluton, Borborema Province, Northeastern Brazil

Lithos ◽  
2019 ◽  
Vol 332-333 ◽  
pp. 192-206 ◽  
Author(s):  
Leon E. Long ◽  
Denise H. Ketcham ◽  
C. Mark Fanning ◽  
Alcides N. Sial
Keyword(s):  
Northeastern Brazil ◽  
Borborema Province
Sign in / Sign up

Export Citation Format

Share Document