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Article: Visible/near infrared reflectance (VNIR) spectral features of ion-exchangeable Rare earth elements hosted by clay minerals: Potential use for exploration of regolith-hosted REE deposits

TitleVisible/near infrared reflectance (VNIR) spectral features of ion-exchangeable Rare earth elements hosted by clay minerals: Potential use for exploration of regolith-hosted REE deposits
Authors
KeywordsIon-exchangeable rare earth element
REE-adsorbed clay minerals
Regolith-hosted REE deposits
Visible/near infrared reflectance (VNIR) spectroscopy
Issue Date2021
Citation
Applied Clay Science, 2021, v. 215, article no. 106320 How to Cite?
AbstractRegolith-hosted ion-exchangeable rare earth element (REE) mineralization in South China dominate the global source of heavy REEs. The lack of studies on spectral features of ion-exchangeable REEs limits the application of visible/near infrared reflectance (VNIR, 350–2500 nm) spectroscopy for rapid identification of regolith-hosted REE deposits in prospective areas. This paper presents a systematic study on VNIR spectral features of ion-exchangeable REEs hosted by a series of synthetic REE-adsorbed clay minerals and natural regolith samples. The results show that ion-exchangeable Nd3+, Dy3+, Ho3+, Er3+ and Tm3+ display diagnostic absorption features at the bands of 730–870, 805, 641, 652, and 684 nm. Specifically, the Nd3+ related absorption bands of regolith samples at ~800 nm show a shoulder at ~802 nm that are distinguishable from unweathered primary REE(−bearing) minerals. The maxima of second derivative curves derived from the Nd3+ absorption at ~802 nm, M802_2nd, can be used to quantify variations of ion-exchangeable REEs in regoliths. Nevertheless, the absorption features of REE3+ ions could be subdued due to an overlapping problem caused by the broad absorption bands of Fe-oxides in the range of 700–900 nm. The obtained VNIR spectra of ion-exchangeable REEs provide critical supplement to spectral library for REE-bearing minerals. This study demonstrates that field-based VNIR spectroscopy can be deployed as a powerful tool for regional and deposit-scale exploration of regolith-hosted ion-exchangeable REE resources.
Persistent Identifierhttp://hdl.handle.net/10722/315773
ISSN
2023 Impact Factor: 5.3
2023 SCImago Journal Rankings: 0.998
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTan, W-
dc.contributor.authorQin, X-
dc.contributor.authorLiu, J-
dc.contributor.authorMichalski, JR-
dc.contributor.authorHe, HONGPING-
dc.contributor.authorYao, Y-
dc.contributor.authorYang, M-
dc.contributor.authorHuang, J-
dc.contributor.authorLin, X-
dc.contributor.authorZhang, C-
dc.contributor.authorLiang, X-
dc.date.accessioned2022-08-19T09:04:09Z-
dc.date.available2022-08-19T09:04:09Z-
dc.date.issued2021-
dc.identifier.citationApplied Clay Science, 2021, v. 215, article no. 106320-
dc.identifier.issn0169-1317-
dc.identifier.urihttp://hdl.handle.net/10722/315773-
dc.description.abstractRegolith-hosted ion-exchangeable rare earth element (REE) mineralization in South China dominate the global source of heavy REEs. The lack of studies on spectral features of ion-exchangeable REEs limits the application of visible/near infrared reflectance (VNIR, 350–2500 nm) spectroscopy for rapid identification of regolith-hosted REE deposits in prospective areas. This paper presents a systematic study on VNIR spectral features of ion-exchangeable REEs hosted by a series of synthetic REE-adsorbed clay minerals and natural regolith samples. The results show that ion-exchangeable Nd3+, Dy3+, Ho3+, Er3+ and Tm3+ display diagnostic absorption features at the bands of 730–870, 805, 641, 652, and 684 nm. Specifically, the Nd3+ related absorption bands of regolith samples at ~800 nm show a shoulder at ~802 nm that are distinguishable from unweathered primary REE(−bearing) minerals. The maxima of second derivative curves derived from the Nd3+ absorption at ~802 nm, M802_2nd, can be used to quantify variations of ion-exchangeable REEs in regoliths. Nevertheless, the absorption features of REE3+ ions could be subdued due to an overlapping problem caused by the broad absorption bands of Fe-oxides in the range of 700–900 nm. The obtained VNIR spectra of ion-exchangeable REEs provide critical supplement to spectral library for REE-bearing minerals. This study demonstrates that field-based VNIR spectroscopy can be deployed as a powerful tool for regional and deposit-scale exploration of regolith-hosted ion-exchangeable REE resources.-
dc.languageeng-
dc.relation.ispartofApplied Clay Science-
dc.subjectIon-exchangeable rare earth element-
dc.subjectREE-adsorbed clay minerals-
dc.subjectRegolith-hosted REE deposits-
dc.subjectVisible/near infrared reflectance (VNIR) spectroscopy-
dc.titleVisible/near infrared reflectance (VNIR) spectral features of ion-exchangeable Rare earth elements hosted by clay minerals: Potential use for exploration of regolith-hosted REE deposits-
dc.typeArticle-
dc.identifier.emailLiu, J: jcliu01@hku.hk-
dc.identifier.emailMichalski, JR: jmichal@hku.hk-
dc.identifier.authorityMichalski, JR=rp02225-
dc.identifier.doi10.1016/j.clay.2021.106320-
dc.identifier.scopuseid_2-s2.0-85119264193-
dc.identifier.hkuros335754-
dc.identifier.volume215-
dc.identifier.spagearticle no. 106320-
dc.identifier.epagearticle no. 106320-
dc.identifier.isiWOS:000720456300005-

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