Calibrating a Handheld LIBS for Li Exploration in the Barroso–Alvão Aplite-Pegmatite Field, Northern Portugal: Textural Precautions and Procedures When Analyzing Spodumene and Petalite.
| Title: | Calibrating a Handheld LIBS for Li Exploration in the Barroso–Alvão Aplite-Pegmatite Field, Northern Portugal: Textural Precautions and Procedures When Analyzing Spodumene and Petalite. |
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| Authors: | Dias, Filipa1,2 (AUTHOR) filipa.dias@fc.up.pt, Ribeiro, Ricardo1,2 (AUTHOR), Gonçalves, Filipe1,2 (AUTHOR), Lima, Alexandre1,2 (AUTHOR) filipa.dias@fc.up.pt, Roda-Robles, Encarnación3 (AUTHOR), Martins, Tânia4 (AUTHOR) |
| Source: | Minerals (2075-163X). Apr2023, Vol. 13 Issue 4, p470. 31p. |
| Subject Terms: | *SPODUMENE, *CATHODOLUMINESCENCE, *ALKALI metals, *LASER-induced breakdown spectroscopy, *MICROSCOPY |
| Geographic Terms: | PORTUGAL |
| Abstract: | In pegmatites containing abundant petalite and spodumene, such as those from the Barroso–Alvão (BA) aplite-pegmatite field, calibrating a portable laser-induced breakdown spectroscopy (pLIBS) equipment to identify and analyze these minerals may be challenging. Forty-nine samples of spodumene, petalite and spodumene + quartz were collected from 22 aplite-pegmatites from the BA field and sent for inductively coupled plasma-mass spectroscopy analysis. One calibration for both spodumene and petalite has been proven to be impossible since almost all the LIBS intensity ratios, including for Li, overlapped on both minerals. Thus, three calibrations were developed: one qualitative to distinguish both minerals and two more quantitative, specifically made for each mineral. The first LIBS calibration only has Fe since it is the sole element with intensity ratios different enough to distinguish both minerals. Eleven calibration lines were created: Li, Al, Si, Be, Na, P, K, Mn, Fe, Rb and Cs; however, only the Li, Al, and Si have consistent errors below 20%. Thin sections were produced and observed with optical microscopy and cathodoluminescence (CL) to control the purity and mineral paragenesis of the samples. The petalite pellets were also controlled with cold CL since petalite crystals often present fine spodumene and quartz inclusions. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Calibrating a Handheld LIBS for Li Exploration in the Barroso–Alvão Aplite-Pegmatite Field, Northern Portugal: Textural Precautions and Procedures When Analyzing Spodumene and Petalite. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Dias%2C+Filipa%22">Dias, Filipa</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> filipa.dias@fc.up.pt</i><br /><searchLink fieldCode="AR" term="%22Ribeiro%2C+Ricardo%22">Ribeiro, Ricardo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gonçalves%2C+Filipe%22">Gonçalves, Filipe</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lima%2C+Alexandre%22">Lima, Alexandre</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> filipa.dias@fc.up.pt</i><br /><searchLink fieldCode="AR" term="%22Roda-Robles%2C+Encarnación%22">Roda-Robles, Encarnación</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Martins%2C+Tânia%22">Martins, Tânia</searchLink><relatesTo>4</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Minerals+%282075-163X%29%22">Minerals (2075-163X)</searchLink>. Apr2023, Vol. 13 Issue 4, p470. 31p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22SPODUMENE%22">SPODUMENE</searchLink><br />*<searchLink fieldCode="DE" term="%22CATHODOLUMINESCENCE%22">CATHODOLUMINESCENCE</searchLink><br />*<searchLink fieldCode="DE" term="%22ALKALI+metals%22">ALKALI metals</searchLink><br />*<searchLink fieldCode="DE" term="%22LASER-induced+breakdown+spectroscopy%22">LASER-induced breakdown spectroscopy</searchLink><br />*<searchLink fieldCode="DE" term="%22MICROSCOPY%22">MICROSCOPY</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22PORTUGAL%22">PORTUGAL</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In pegmatites containing abundant petalite and spodumene, such as those from the Barroso–Alvão (BA) aplite-pegmatite field, calibrating a portable laser-induced breakdown spectroscopy (pLIBS) equipment to identify and analyze these minerals may be challenging. Forty-nine samples of spodumene, petalite and spodumene + quartz were collected from 22 aplite-pegmatites from the BA field and sent for inductively coupled plasma-mass spectroscopy analysis. One calibration for both spodumene and petalite has been proven to be impossible since almost all the LIBS intensity ratios, including for Li, overlapped on both minerals. Thus, three calibrations were developed: one qualitative to distinguish both minerals and two more quantitative, specifically made for each mineral. The first LIBS calibration only has Fe since it is the sole element with intensity ratios different enough to distinguish both minerals. Eleven calibration lines were created: Li, Al, Si, Be, Na, P, K, Mn, Fe, Rb and Cs; however, only the Li, Al, and Si have consistent errors below 20%. Thin sections were produced and observed with optical microscopy and cathodoluminescence (CL) to control the purity and mineral paragenesis of the samples. The petalite pellets were also controlled with cold CL since petalite crystals often present fine spodumene and quartz inclusions. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Minerals (2075-163X) is the property of MDPI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/min13040470 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 31 StartPage: 470 Subjects: – SubjectFull: PORTUGAL Type: general – SubjectFull: SPODUMENE Type: general – SubjectFull: CATHODOLUMINESCENCE Type: general – SubjectFull: ALKALI metals Type: general – SubjectFull: LASER-induced breakdown spectroscopy Type: general – SubjectFull: MICROSCOPY Type: general Titles: – TitleFull: Calibrating a Handheld LIBS for Li Exploration in the Barroso–Alvão Aplite-Pegmatite Field, Northern Portugal: Textural Precautions and Procedures When Analyzing Spodumene and Petalite. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Dias, Filipa – PersonEntity: Name: NameFull: Ribeiro, Ricardo – PersonEntity: Name: NameFull: Gonçalves, Filipe – PersonEntity: Name: NameFull: Lima, Alexandre – PersonEntity: Name: NameFull: Roda-Robles, Encarnación – PersonEntity: Name: NameFull: Martins, Tânia IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2023 Type: published Y: 2023 Identifiers: – Type: issn-print Value: 2075163X Numbering: – Type: volume Value: 13 – Type: issue Value: 4 Titles: – TitleFull: Minerals (2075-163X) Type: main |
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