Distribution of ilmenite minerals in placer deposits along the middle coast of Southern Brazil using spaceborne and ground-based remote sensing
Gabriel Prates Hallal, Carla Cristine Porcher, Bijeesh Kozhikkodan Veettil, Jean Marcel de Almeida Espinoza, Silvia Beatriz Alves Rolim
TL;DR
This study uses remote sensing to map ilmenite, a titanium oxide mineral, in coastal areas of Southern Brazil, revealing its distribution and purity.
Contribution
The study introduces an integrated approach using thermal infrared remote sensing and microanalysis to map and assess ilmenite in coastal deposits.
Findings
Ilmenite concentrations ranged from 0 to 29.6%, with the highest in transgressive dune fields.
80% of the minerals identified were pure ilmenite with low impurities and weathering.
ASTER sensor data combined with μFT-IR and SEM provided accurate, non-destructive mineral mapping.
Abstract
Titanium oxide is of fundamental strategic importance in the global market as it is used as a raw material by several industries, such as medical prostheses, paints, pigments, and, more recently, electronic chips. The main source of titanium oxide is ilmenite, a mineral deposited in many coastal areas of the world, including the state of Rio Grande do Sul in Southern Brazil in its central coastal plain, under specific morphodynamic conditions. Some geological targets, such as mineral oxides, show distinct thermal spectral features. The present study evaluated the surface concentration of ilmenite in Southern Brazil using thermal spectroscopy (μFT-IR). The emissivity spectral signatures of pure ilmenite between 8 and 14 μm were determined and some indicative features were identified. The obtained emissivity spectrum has been employed as a reference for the Spectral Angle Mapper (SAM) and…
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Taxonomy
TopicsGeochemistry and Geologic Mapping · Remote-Sensing Image Classification · Heavy metals in environment