2020-03-102020-03-102019-12-04OLIVEIRA NETO, Plácido Cardoso de. Microscopia de luz infravermelha próxima e suas aplicações geológicas: implantação da técnica no laboratório de inclusões fluidas do IG/UFPA. Orientador: Régis Munhoz Krás Borges. 2019. 49 f. Trabalho de Curso (Bacharelado em Geologia) - Faculdade de geologia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2019. Disponível em: https://bdm.ufpa.br:8443/jspui/handle/prefix/3094. Acesso em:.https://bdm.ufpa.br/handle/prefix/3094Near Infrared (NIR) microscopy is a technique that allows the characterization of internal features (textures, zoning, growth bands, and fluid and solids inclusions) of minerals that behave as opaque to visible light. The near infrared, located in the wavelength range of the electromagnetic radiation spectrum above red light (780 to 2500 nm), is shown to be a suitable energy intensity not to stimulate the valence band electrons for a conduction band, where a matter absorbs part or all of the incident light. According to the mineral chemical composition, the minimum energy for it becomes opaque is called band gap energy. Internal factors, such as the presence of impurities - substitution elements in some element intrinsic to the mineral - and external factors, such as sample thickness, also influence the degree of transparency that the mineral can exhibit. An NIR microscopy system was routinely placed at the Fluid Inclusions Laboratory of the Geosciences Institute of the Federal University of Pará to establish an optimal configuration for its use. This system consists of OLYMPUS's BX51-IR microscope, two infrared (IR) cameras: RETIGA 4000R with spectral sensitivity up to 1000 nm and high resolution (2048 x 2048 pixels) and ROLERA-XR with spectral sensitivity up to 1080 and low resolution (696 x 520 pixels) from QIMAGING, and the QCAPTURE PRO7 program. For the experiments, polished oxide and sulfide samples from different mining districts of Brazil were analyzed: from Carajás Mineral Province analyzes performed on hematite and magnetite crystals; from Quadrilátero Ferrífero in hematite crystals and from Pitinga Province in hematite, cassiterite and sphalerite crystals. The degree of transparency of the studied minerals is consistent with their energy gap. All magnetite crystals remain opaque, while hematites display varying degrees of transparency, from good to very good, in the case of Carajás provenance and opaque in the case of hematite from Pitinga. Cassiterite and sphalerite crystals have good transparency. The implementation of this methodology demonstrated good results, from the understanding of the optics of the NIR system and the results of the captured images, creating a good expectation for its use in metallogenetic studies, as well as other geological applications.Acesso AbertoMicroscópio de Luz Infravermelha PróximaÓxidosSulfetosEstudos metalogenéticosNear Infrared MicroscopeOxidesSulphidesMetallogenetic studiesCNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOLOGIATrabalho de Curso - Graduação - Monografia