Hydrothermal titanite from the Chengchao iron skarn deposit: temporal constraints on iron mineralization, and its potential as a reference material for titanite U–Pb dating

Hu, Hao; Li, Jianwei; McFarlane, Christopher R.M.

doi:10.1007/s00710-017-0517-z

Cited by 24 publications

(2 citation statements)

References 38 publications

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“…Revealing the diverse sources of titanites is achievable through analyses of their texture and geochemical characteristics [1]. According to previous studies [3,4,10,13,[55][56][57][58][59][60][61][62][63], elements can distinguish magmatic-and hydrothermal-derived titanites (Figure 11). In general, V is enriched in hydrothermal titanite.…”

Section: Formation Conditions and Origin Of The Titanite From Moroccomentioning

confidence: 99%

Gemological and Chemical Characterization of Gem-Quality Titanite from Morocco

Yuan,

Miao,

Zhao

et al. 2024

Crystals

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Titanite is a widespread accessory mineral in igneous, metamorphic, and hydrothermal rocks, but few comply with gem-grade requirements. Previous studies on Moroccan titanite focused on elementary composition and U-Pb dating. In this study, two gem-grade titanites (MA-1 and MA-2) from the Moroccan Central High Atlas were investigated through gemological and chemical studies, including infrared spectrum, Raman spectrum, SEM-EDS, and LA-ICP-MS. Two titanite samples are yellow, transparent–translucent with a greasy luster, 3.5 and 2.5 mm long. MA-1 and MA-2 have similar gemological properties, the refractive index (RI) is beyond the range of the refractometer (>1.78), the specific gravity (SG) values fall in the range of 3.52~3.54 and both are inert to short-wave and long-wave UV radiation. The spectral characteristics have high consistency with the RRUFF database. The major elements’ composition shows a negative correlation between Al, Fe, V, and Ti, suggesting the titanites underwent substitutions such as (Al, Fe3+) + (F, OH) ↔ Ti + O. The titanite samples, characterized by a low abundance of REE (802~4088 ppm) and enriched in LREE, exhibit positive Eu (δEu: 1.53~7.79) and Ce (δCe: 1.08~1.33) anomalies, indicating their formation in a hydrothermal environment with low oxygen fugacity. The 238U/206Pb and 207Pb/206Pb ratios of the titanites yield lower intercept ages of 152.6 ± 2.2 and 151.4 ± 5.3 Ma (1s), consistent with their weighted average 206Pb/238U ages of 152.3 ± 2.0 and 150.7 ± 3.2 Ma (1s) respectively. The results of U-Pb dating are matched with the second main magmatic activities in the High Atlas intracontinental belt of Morocco during the Mesozoic to Cenozoic period. Moreover, the two titanite samples have almost no radiational damage. All the results show that the titanite from High Atlas, Morocco, has the potential to be a reference material for LA-ICP-MS U–Pb dating, but further experiments are needed to be sure.

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Section: Formation Conditions and Origin Of The Titanite From Moroccomentioning

confidence: 99%

Gemological and Chemical Characterization of Gem-Quality Titanite from Morocco

Yuan,

Miao,

Zhao

et al. 2024

Crystals

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“…Some of them are characterised by enrichment in Nb or V and an OH-dominated anion site (greenschist gneisses from Andros island [8]; the Salton Sea geothermal system [9]). Regarding trace element contents of titanites, abundant data concern magmatic rocks or relatively high-temperature (>600 • C) metamorphic rocks, some related to water-rock interactions such as skarn formation [10]. Data on titanites from lower temperature hydrothermal systems are scarce, except for the Salton Sea geothermal system [9].…”

Section: Introductionmentioning

confidence: 99%

Al-Rich Titanites from Mont Blanc Alpine Fissures: Evidence of Ti-Nb-Y-REE Mobility during Water–Rock Interactions

Cathelineau,

Peiffert

2024

Crystals

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Titanites can be excellent markers of element transfer in medium-temperature retrograde metamorphism. Euhedral titanites from several alpine fissures from Mont Blanc, particularly those of Périades and Courtes, crystallised at the end of the main quartz stage and are synchronous with the formation of green biotites and albite before chlorite formation. Micro-XRF, SEM, electron probe, and LA-ICP-MS analyses show that these titanites have a wide range of Al2O3 content from 1 to 8%, are dominated by -OH versus F, and have a wide range of Nb (up to 4500 ppm), Y (up to 3000 ppm), Zr (up to 1800 ppm), and Sn (up to 1400 ppm) concentrations. The allanite from the granite, partly destabilised into epidote, is the most likely source of Nb, Y, Zr, Sn, and REE. Titanites are enriched in HREE and show variations in LREE depending on the studied sites. Like quartz, they formed at around 400 ± 20 °C, which is compatible with the formation of green biotites after the destabilisation of granite Fe-Mg silicates. This early stage of fluid circulation, synchronous with the Mont Blanc massif uplift, is therefore marked by the titanite formation at the transition between the biotite and chlorite stability fields.

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