Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar
With the development of mineral testing technology and ore deposit geochemistry, titanite has become a hot topic in the study of accessory minerals. Two large-grained titanite crystals from Mogok, Myanmar, were used for a detailed study. In this study, the standard gemmological properties and spectr...
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MDPI AG
2022-07-01
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| Online Access: | https://www.mdpi.com/2073-4352/12/8/1050 |
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| author | Jialu Gu Bo Xu Shu Li Yi Zhao |
| author_facet | Jialu Gu Bo Xu Shu Li Yi Zhao |
| author_sort | Jialu Gu |
| collection | DOAJ |
| description | With the development of mineral testing technology and ore deposit geochemistry, titanite has become a hot topic in the study of accessory minerals. Two large-grained titanite crystals from Mogok, Myanmar, were used for a detailed study. In this study, the standard gemmological properties and spectral characteristics of titanite crystals were obtained by Fourier transform in-frared, micro ultraviolet-visible-near-infrared and Raman spectroscopy, respectively, which pro-vide a full set of data. Mineral major and trace elements were analysed using Electron-Probe Mi-croAnalysis (EPMA) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). The purpose of this study is to report spectral characteristics and major and trace elements of Mogok, Myanmar, in order to find new potential titanite standard samples. The two titanite crystals have similar major element compositions, and both grains have relatively low Al content (0.011–0.014 apfu) and Al/Fe ratios (0.157–0.222), but high Fe content (0.063–0.079 apfu). The two titanite crystals have similar chondrite-normalised rare earth element (REE) patterns with significantly Light Rare Earth Element (LREE) (La–Gd) enrichment and deletion of Heavy Rare Earth Element (HREE) (Tb–Lu). The <sup>238</sup>U/<sup>206</sup>Pb ages of the two titanite samples are 43.5 ± 5.8 Ma and 34.0 ± 4.2 Ma, respectively. Generally, magmatic titanite has a low Al/Fe ratio, metamorphic and hydrothermal titanite crystals have extremely low Th/U ratios close to zero, with flat chondrite-normalised REE patterns or depletions in light REEs relative to heavy REEs. Different genetic types of titanite can be distinguished by the characteristics of major and trace elements. Combined chemical features such as REE differentiation, Al/Fe and Th/U ratios with formation temperature, the analysed titanite samples are considered magmatic-hydrothermal titanites. Their <sup>238</sup>U/<sup>206</sup>Pb ages may indicate a potential stage of magmatic hydrothermal conversion. |
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| last_indexed | 2024-03-09T04:34:57Z |
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| spelling | doaj.art-763e0f269d594ff5a0534cecf5d9ef052023-12-03T13:29:52ZengMDPI AGCrystals2073-43522022-07-01128105010.3390/cryst12081050Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, MyanmarJialu Gu0Bo Xu1Shu Li2Yi Zhao3School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Haidian District, Beijing 100083, ChinaSchool of Gemmology, China University of Geosciences Beijing, 29 Xueyuan Road, Haidian District, Beijing 100083, ChinaSchool of Gemmology, China University of Geosciences Beijing, 29 Xueyuan Road, Haidian District, Beijing 100083, ChinaSchool of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Haidian District, Beijing 100083, ChinaWith the development of mineral testing technology and ore deposit geochemistry, titanite has become a hot topic in the study of accessory minerals. Two large-grained titanite crystals from Mogok, Myanmar, were used for a detailed study. In this study, the standard gemmological properties and spectral characteristics of titanite crystals were obtained by Fourier transform in-frared, micro ultraviolet-visible-near-infrared and Raman spectroscopy, respectively, which pro-vide a full set of data. Mineral major and trace elements were analysed using Electron-Probe Mi-croAnalysis (EPMA) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). The purpose of this study is to report spectral characteristics and major and trace elements of Mogok, Myanmar, in order to find new potential titanite standard samples. The two titanite crystals have similar major element compositions, and both grains have relatively low Al content (0.011–0.014 apfu) and Al/Fe ratios (0.157–0.222), but high Fe content (0.063–0.079 apfu). The two titanite crystals have similar chondrite-normalised rare earth element (REE) patterns with significantly Light Rare Earth Element (LREE) (La–Gd) enrichment and deletion of Heavy Rare Earth Element (HREE) (Tb–Lu). The <sup>238</sup>U/<sup>206</sup>Pb ages of the two titanite samples are 43.5 ± 5.8 Ma and 34.0 ± 4.2 Ma, respectively. Generally, magmatic titanite has a low Al/Fe ratio, metamorphic and hydrothermal titanite crystals have extremely low Th/U ratios close to zero, with flat chondrite-normalised REE patterns or depletions in light REEs relative to heavy REEs. Different genetic types of titanite can be distinguished by the characteristics of major and trace elements. Combined chemical features such as REE differentiation, Al/Fe and Th/U ratios with formation temperature, the analysed titanite samples are considered magmatic-hydrothermal titanites. Their <sup>238</sup>U/<sup>206</sup>Pb ages may indicate a potential stage of magmatic hydrothermal conversion.https://www.mdpi.com/2073-4352/12/8/1050titaniteU–Pb datingLA-ICP-MSmajor and trace elements |
| spellingShingle | Jialu Gu Bo Xu Shu Li Yi Zhao Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar Crystals titanite U–Pb dating LA-ICP-MS major and trace elements |
| title | Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar |
| title_full | Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar |
| title_fullStr | Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar |
| title_full_unstemmed | Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar |
| title_short | Titanite Spectroscopy and In Situ LA-ICP-MS U–Pb Geochronology of Mogok, Myanmar |
| title_sort | titanite spectroscopy and in situ la icp ms u pb geochronology of mogok myanmar |
| topic | titanite U–Pb dating LA-ICP-MS major and trace elements |
| url | https://www.mdpi.com/2073-4352/12/8/1050 |
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