Maciços graníticos como rochas ornamentais na região nordeste do Estado do Amazonas: uma perspectiva de investimento para a cidade de Manaus

Maas, Elayne Cristina Andrade de Sousa; Souza, Valmir da Silva

doi:10.1590/s0370-44672009000300012

Cited by 2 publications

(2 citation statements)

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“…The granite is pink colored, displays inequigranular medium-to coarse-grained texture and isotropic fabric ( Fig. 2A and 2B), presents technical characteristics that allow its use as ornamental rock, but it has been mainly used as crushed stone to supply the construction industry (Maas & Souza 2009). It is cut by NNE-SSW discrete normal faults and fractures.…”

Section: Pedra Do Gavião Syenogranitementioning

confidence: 99%

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

Souza

Dantas

et al. 2015

Braz. J. Geol.

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<p>The Mesoproterozoic K'Mudku event (1490 - 1147 Ma) is represented by a britlle-ductile shear belt that cuts across the Paleoproterozoic units in the southernmost Guyana shield, central-north Amazon craton. This event produced mylonitization and cataclasites at low/medium- to high-grade metamorphic, and local within-plate magmatism. In the Amazonas State, Brazil, A-type magmatism chronologically associated to K'Mudku has been reported for the Pedra do Gavião and Samaúma syenogranites. However, the spatial relationship between K´Mudku event and A-type magma generation are not yet adequately clarified in the region. The Pedra do Gavião syenogranite is a high-K alkaline, metaluminous, reduced A-type granite with a post-collisional to within-plate geochemical signature. It has U-Pb zircons crystallization age of 1218 Ma and inherited zircons with ages between 1820 and 1720 Ma, which, together with the Sm-Nd data, suggest melting of Paleoproterozoic basement rocks of the Cauaburi Complex (1810 - 1780 Ma) regional unit. These data demonstrate that the effects of the A-type magmatism associated to the end of the Grenvillian-Sunsas orogeny, reported primarily in the southwestern margin of the Amazon craton, may also be extended for the central-northern part of the Amazon craton. Probably the generation or emplacement mechanisms of A-type magma occurred with some degree of involvement in the final stages of the K´Mudku event. However, this tectonic framework conception still needs more geological and geophysical investigations. Therefore, these news data should instigate to the return of geological research in the region, as well as to debate on the tectonic evolution and A-type granites production during the Ectasian-Stenian period in the central-north Amazon craton.</p>

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Section: Pedra Do Gavião Syenogranitementioning

confidence: 99%

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

Souza

Dantas

et al. 2015

Braz. J. Geol.

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“…The State of Amazonas presents geological areas favorable to the presence of granitic rocks, found mainly in the municipalities of Presidente Figueiredo, Barcelos and São Gabriel da Cachoeira. The city of Presidente Figueiredo stands out as an important pole of products for civil construction in Manaus, with its main product being gravel [10]. The municipality has a granite reserve of about 200 km 2 , which is explored by small companies, which together generate a considerable amount of solid waste from the extraction process of granitic rocks [11,12].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the potential use of granite waste in products of the red ceramic industry in the state of Amazonas

Coelho¹,

Saggioro²,

Júnior³

et al. 2022

Matéria (Rio J.)

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The increase in the exploitation of raw materials in the civil construction sector has led to an increase in damage to the environment, mainly due to the improper disposal of granitic waste. However, this fact has caused damage to the environment. Therefore, this research aims to analyze the influence of the introduction of granite waste in a clay matrix aiming its use in the red ceramic industry. For this, the clay from the ceramic pole in the city of Iranduba -AM and granite waste from a company located in the municipality of Presidente Figueiredo -AM were collected. Formulations were made containing three levels of waste (0, 10 and 20% mass) and three firing temperatures (1173, 1273 and 1373K). The materials were characterized by X-ray fluorescence spectroscopy, X-ray diffraction, scanning electron microscopy and the following technological properties were determined: water absorption; linear retraction; apparent porosity; specific mass; and 3-point flexural rupture module. The results showed that the glassy phases generated provide a better densification of the formulations with 20% of waste, sintered at 1373K, as they presented favorable mechanical properties for the manufacture of red ceramic products, providing a correct destination of the waste and providing alternatives for the social, economic context and environmental impact of the Amazon region.

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Maciços graníticos como rochas ornamentais na região nordeste do Estado do Amazonas: uma perspectiva de investimento para a cidade de Manaus

Cited by 2 publications

References 1 publication

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

K'Mudku A-type magmatism in the southernmost Guyana Shield, central-north Amazon Craton (Brazil): the case of Pedra do Gavião syenogranite

Evaluation of the potential use of granite waste in products of the red ceramic industry in the state of Amazonas

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