Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area
Reflectance spectroscopy has been used to identify several deposit types. However, applications concerning lithium (Li)-pegmatites are still scarce. Reflectance spectroscopic studies complemented by microscopic and geochemical studies were employed in the Fregeneda–Almendra (Spain–Portugal) pegmatit...
| Authors: | , , , , , , , , , |
|---|---|
| Format: | article |
| Publication Date: | 2021 |
| Country: | España |
| Institution: | Universidad del País Vasco |
| Repository: | Addi. Archivo Digital para la Docencia y la Investigación |
| OAI Identifier: | oai:addi.ehu.eus:10810/53193 |
| Online Access: | http://hdl.handle.net/10810/53193 |
| Access Level: | Open access |
| Keyword: | remote sensing reflectance spectroscopy hyperspectral geological exploration spectral library absorption features spectral mineralogy pegmatite lithium |
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Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| title |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| spellingShingle |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area Cardoso Fernandes, Joana remote sensing reflectance spectroscopy hyperspectral geological exploration spectral library absorption features spectral mineralogy pegmatite lithium |
| title_short |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| title_full |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| title_fullStr |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| title_full_unstemmed |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| title_sort |
Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra Area |
| dc.creator.none.fl_str_mv |
Cardoso Fernandes, Joana Silva, João Perrotta, Mônica Lima, Alexandre Teodoro, Ana Claudia Ribeiro, Maria Anjos Dias, Filipa Barrès, Odile Cauzid, Jean Roda Robles, María Encarnación |
| author |
Cardoso Fernandes, Joana |
| author_facet |
Cardoso Fernandes, Joana Silva, João Perrotta, Mônica Lima, Alexandre Teodoro, Ana Claudia Ribeiro, Maria Anjos Dias, Filipa Barrès, Odile Cauzid, Jean Roda Robles, María Encarnación |
| author_role |
author |
| author2 |
Silva, João Perrotta, Mônica Lima, Alexandre Teodoro, Ana Claudia Ribeiro, Maria Anjos Dias, Filipa Barrès, Odile Cauzid, Jean Roda Robles, María Encarnación |
| author2_role |
author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
European Commission |
| dc.subject.none.fl_str_mv |
remote sensing reflectance spectroscopy hyperspectral geological exploration spectral library absorption features spectral mineralogy pegmatite lithium |
| topic |
remote sensing reflectance spectroscopy hyperspectral geological exploration spectral library absorption features spectral mineralogy pegmatite lithium |
| description |
Reflectance spectroscopy has been used to identify several deposit types. However, applications concerning lithium (Li)-pegmatites are still scarce. Reflectance spectroscopic studies complemented by microscopic and geochemical studies were employed in the Fregeneda–Almendra (Spain–Portugal) pegmatite field to analyze the spectral behavior of Li-minerals and field lithologies. The spectral similarity of the target class (Li-pegmatites) with other elements was also evaluated. Lepidolite was discriminated from other white micas and the remaining Li-minerals. No diagnostic feature of petalite and spodumene was identified, since their spectral curves are dominated by clays. Their presence was corroborated (by complementary techniques) in petalite relics and completely replaced crystals, although the clay-related absorption depths decrease with Li content. This implies that clays can be used as pathfinders only in areas where argillic alteration is not prevalent. All sampled lithologies present similar water and/or hydroxide features. The overall mineral assemblage is very distinct, with lepidolite, cookeite, and orthoclase exclusively identified in Li-pegmatite (being these minerals crucial targets for Li-pegmatite discrimination in real-life applications), while chlorite and biotite can occur in the remaining lithologies. Satellite data can be used to discriminate Li-pegmatites due to distinct reflectance magnitude and mineral assemblages, higher absorptions depths, and distinct Al–OH wavelength position. The potential use of multi- and hyperspectral data was evaluated; the main limitations and advantages were discussed. These new insights on the spectral behavior of Li-minerals and pegmatites may aid in new Li-pegmatite discoveries around the world. |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021 2021 2021 2021 |
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info:eu-repo/semantics/article |
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article |
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http://hdl.handle.net/10810/53193 |
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http://hdl.handle.net/10810/53193 |
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Inglés |
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Inglés |
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info:eu-repo/grantAgreement/EC/H2020/869274 info:eu-repo/grantAgreement/MICINN/RTI2018-094097-B-100/ info:eu-repo/grantAgreement/EC/H2020/776804 https://www.mdpi.com/2072-4292/13/18/3688/htm |
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info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/es/ |
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openAccess |
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http://creativecommons.org/licenses/by/3.0/es/ |
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MDPI |
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MDPI |
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reponame:Addi. Archivo Digital para la Docencia y la Investigación instname:Universidad del País Vasco |
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Universidad del País Vasco |
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Addi. Archivo Digital para la Docencia y la Investigación |
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Addi. Archivo Digital para la Docencia y la Investigación |
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Interpretation of the Reflectance Spectra of Lithium (Li) Minerals and Pegmatites: A Case Study for Mineralogical and Lithological Identification in the Fregeneda-Almendra AreaCardoso Fernandes, JoanaSilva, JoãoPerrotta, MônicaLima, AlexandreTeodoro, Ana ClaudiaRibeiro, Maria AnjosDias, FilipaBarrès, OdileCauzid, JeanRoda Robles, María Encarnaciónremote sensingreflectance spectroscopyhyperspectralgeological explorationspectral libraryabsorption featuresspectral mineralogypegmatitelithiumReflectance spectroscopy has been used to identify several deposit types. However, applications concerning lithium (Li)-pegmatites are still scarce. Reflectance spectroscopic studies complemented by microscopic and geochemical studies were employed in the Fregeneda–Almendra (Spain–Portugal) pegmatite field to analyze the spectral behavior of Li-minerals and field lithologies. The spectral similarity of the target class (Li-pegmatites) with other elements was also evaluated. Lepidolite was discriminated from other white micas and the remaining Li-minerals. No diagnostic feature of petalite and spodumene was identified, since their spectral curves are dominated by clays. Their presence was corroborated (by complementary techniques) in petalite relics and completely replaced crystals, although the clay-related absorption depths decrease with Li content. This implies that clays can be used as pathfinders only in areas where argillic alteration is not prevalent. All sampled lithologies present similar water and/or hydroxide features. The overall mineral assemblage is very distinct, with lepidolite, cookeite, and orthoclase exclusively identified in Li-pegmatite (being these minerals crucial targets for Li-pegmatite discrimination in real-life applications), while chlorite and biotite can occur in the remaining lithologies. Satellite data can be used to discriminate Li-pegmatites due to distinct reflectance magnitude and mineral assemblages, higher absorptions depths, and distinct Al–OH wavelength position. The potential use of multi- and hyperspectral data was evaluated; the main limitations and advantages were discussed. These new insights on the spectral behavior of Li-minerals and pegmatites may aid in new Li-pegmatite discoveries around the world.The authors would like to thank the financial support provided by FCT–Fundação para a Ciência e a Tecnologia, I.P., with the ERA-MIN/0001/2017–LIGHTS project and, also, with the 869274—GREENPEG—H2020-SC5-2018-2019-2020 project. This work was also supported by national funds through the FCT project UIDB/04683/2020–ICT (Institute of Earth Sciences). Joana Cardoso-Fernandes and Filipa Dias were financially supported within the compass of their respective Ph.D. theses, ref. SFRH/BD/136108/2018 and ref. 2020.05534.BD, by national funds from MCTES through FCT and co-financed by the European Social Fund (ESF) through POCH–Programa Operacional Capital Humano and NORTE 2020 regional program. The Spanish Ministerio de Ciencia, Innovacion y Universidades (Project RTI2018-094097-B-100, with ERDF funds) and the University of Basque County (UPV/EHU) (grant GIU18/084) also contributed economically. The French National Research Agency (ANR–10–LABX 21–LABEX RESSOURCES 21) partly supported the Master Student personal grant, and the 776804–NEXT–H2020-SC5-2017 project participated in equipment purchasing.MDPIEuropean Commission2021202120212021info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/53193reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoInglésinfo:eu-repo/grantAgreement/EC/H2020/869274info:eu-repo/grantAgreement/MICINN/RTI2018-094097-B-100/info:eu-repo/grantAgreement/EC/H2020/776804https://www.mdpi.com/2072-4292/13/18/3688/htminfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/3.0/es/2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).oai:addi.ehu.eus:10810/531932026-06-18T09:23:17Z |
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