Characterization of lithium (Li) minerals from the Fregeneda-Almendra region through laboratory spectral measurements: a comparative study

• Type: Article in International Conference Proceedings Book
• Date: 2020

Authors

Cardoso Fernandes, J (Author) Other; Silva, J (Author) Other; Alexandre Lima (Author) FCUP; Ana Teodoro (Author) FCUP; Perrotta, M (Author) Other; Cauzid, J (Author) Other; Roda Robles, E (Author) Other

Conference proceedings International

Title: EARTH RESOURCES AND ENVIRONMENTAL REMOTE SENSING/GIS APPLICATIONS XI

Conference on Earth Resources and Environmental Remote Sensing/GIS Applications XI held at SPIE Remote Sensing Conference

ELECTR NETWORK, SEP 21-25, 2020

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 8 Citations

Other information

Authenticus ID: P-00S-QAS

DOI: 10.1117/12.2573941

Abstract (EN): Although several lithium ( Li) bearing minerals have already been spectrally characterized, there are no current reference spectra for petalite in large and public access spectral libraries. This fact is aggravated by the difficulty in the identification of petalite's diagnostic features. The study area of this work is the Fregeneda (Spain) - Almendra (Portugal) region, where distinct Li bearing minerals occur in several types of enriched pegmatite dikes. Accordingly, the objectives delineated for this work were: (i) improve the existing knowledge on the spectral signatures of Li bearing minerals (lepidolite, spodumene, petalite); (ii) compare the spectra obtained for petalite and spodumene in the study area; (iii) and compare the spectra of the Li bearing minerals from the Fregeneda-Almendra area with the reference spectra from the United States Geological Survey (USGS), the ECOSTRESS and the Geological Survey of Brazil (CPRM) spectral libraries. For that, spectral measurements were conducted in the laboratory using the SR-6500A (Spectral Evolution, Inc.) spectrometer. The results only allowed to discriminate lepidolite, since that, both, petalite and spodumene, present absorption features typical of montmorillonite and illite, or a combination between these two minerals. This is also verified in samples of corresponding minerals in other spectral libraries. No diagnostic features of these two Li bearing minerals were identified, highlighting the difficulty to spectrally discriminate them from each other and from clay minerals.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7