Age determination of nephrite by in-situ SIMS U–Pb dating syngenetic titanite: A case study of the nephrite deposit from Luanchuan, Henan, China

Ling, Xiao‐Xiao; Schmädicke, Esther; Li, Qiuli; Gose, Jürgen; Wu, Rui-Hua; Wang, Shiqi; Liu, Yü; Tang, Guoqiang; Li, Xian‐Hua

doi:10.1016/j.lithos.2015.02.019

Cited by 38 publications

(16 citation statements)

References 45 publications

(53 reference statements)

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“…For example, in the metagabbro and hornblendites, magmatic ilmenite was replaced by metamorphic titanite and likely secondary ilmenite ( Figure 6E). Based on textural features, the metamorphic origin of titanites in both the barren and mineralization-bearing metabasites is consistent with their Fe/Al ratio (cf., Ling et al [62], and references therein; Figure 10). In contrast, titanite from the syenite plots outside the field of metamorphic titanites pointing to post-metamorphic formation of titanites from the syenite.…”

Section: Provenance and Evolution Of Igneous And Metaigneous Rocksmentioning

confidence: 96%

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Origin of Talc and Fe-Ti-V Mineralization in the Kletno Deposit (the Śnieżnik Massif, SW Poland)

et al. 2019

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The Kletno deposit in theŚnieżnik Massif (Central Sudetes, SW Poland), mined for Fe, U, Ag, Cu, fluorite, and marble through the ages, developed at the contact of marbles and orthogneiss. Here, we present a new Fe-Ti-V-ore (containing up to 14.07 wt. % Fe, 2.05 wt. % Ti, and 2055 ppm V in bulk rock) and ornamental-to gem-quality talc prospect at the southwest margin of this deposit. This newly documented Fe-Ti-V mineralization is hosted in hornblendites, dolomite veins, and chlorite schists, which, along with talc, envelopes a tectonic slice of serpentinite. Hornblendites are interpreted as metamorphosed ferrogabbros, derived from the same mafic melts as adjacent barren metagabbros. The oxygen and carbon isotope compositions of metabasites and dolomite veins (amphibole δ 18 O values = 8.8-9.3% ; carbonate δ 18 O values = 12.8-16.0% , and δ 13 C values = −8.3% to −7.2% ), in combination with those of the country marbles (carbonate δ 18 O and δ 13 C values = 23.2% and +0.1% , respectively), suggest that mineralization-bearing hornblendites formed due to interaction of the mafic magma with CO 2 released during the decarbonation of the sediments. The CO 2 -bearing fluid interaction with gabbros likely caused carbonation of the gabbros and formation of the dolomite veins, whereas talc formed due to Si-rich fluids, possibly derived from a mafic intrusion, interaction with serpentinite, or due to the metasomatism of the serpentinite-gabbro assemblage. Moreover, fluids leaching Fe and Ti from the adjacent sediments can mix with the mafic magma causing enrichment of the magma in Fe and Ti. Consequently, the mineralization-bearing ferrogabbros became even more enriched in Fe and Ti, which can be linked with the formation of Fe-Ti-V ore bodies.

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Section: Provenance and Evolution Of Igneous And Metaigneous Rocksmentioning

confidence: 96%

“…Titanites composition in terms of Al vs. Fe ratio. Discrimination diagram of titanites modified after Ling et al[62], and references therein.…”

mentioning

confidence: 99%

Origin of Talc and Fe-Ti-V Mineralization in the Kletno Deposit (the Śnieżnik Massif, SW Poland)

et al. 2019

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“…During the analysis, mineral inclusions and major fractures were avoided according to the optical photomicrographs and BSE images. The analytical procedures were similar to those described by Ling et al [22]. The O 2 primary ion beam was accelerated at 13 kV, with an intensity of 10 nA and an analytical spot size of 20 µm × 30 µm.…”

Section: Titanite U-pb Datingmentioning

confidence: 99%

“…Moreover, the ability to incorporate quantities of U, Th, and Pb into the lattice (substitutions for Ca site) makes titanite an ideal U-Th-Pb geochronometer [14][15][16][17][18][19]. Metamorphic processes with a wide range of temperatures can be constrained well by titanite U-Pb dating using modern microbeam techniques such as laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) or SIMS [20][21][22]. Furthermore, the U-Pb system in titanite has a relatively high closure temperature (approximately 650-700 • C) [14], close to the formation temperatures of gem-quality corundum in marble (620-670 • C) [23], which suggests that titanite, if present, could be an appropriate mineral to constrain the age of ruby formation.…”

Section: Introductionmentioning

confidence: 99%

~25 Ma Ruby Mineralization in the Mogok Stone Tract, Myanmar: New Evidence from SIMS U–Pb Dating of Coexisting Titanite

et al. 2021

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Ruby (red corundum) is one of the most prominent colored gemstones in the world. The highest-quality ruby (“pigeon blood” ruby) comes from marbles of the Mogok Stone Tract in central Myanmar. Although Mogok ruby has been exploited since the 6th century AD, the formation time of this gemstone is ambiguous and controversial. In this paper, we describe a mineralogical, geochemical, and geochronological study of ruby and titanite in ruby-bearing marbles obtained from an outcrop in the Mogok Stone Tract, central Myanmar. Petrographic observations have shown that titanite generally occurs in the marble matrix or occurs as inclusions in ruby. These two types of titanite exhibit identical chemical compositions. In situ secondary ion mass spectrometer (SIMS) U–Pb dating of the separated titanite from two representative samples of ruby-bearing marbles yielded lower intercept ages of 25.15 ± 0.24 Ma (MSWD = 0.26) and 25.06 ± 0.22 Ma (MSWD = 0.15), respectively. Because the closure temperature of the U–Pb system in titanite is close to the temperature of ruby growth, the obtained U–Pb ages (~25 Ma) are suggested to represent the timing of the studied ruby formation in Mogok. The acquired ages are in agreement with the timing of post-collisional extension in the Himalaya related to the migration of the eastern Himalayan syntaxis. Combining our dating results with previous geochronological data from the Mogok Stone Tract, we suggest that the formation of the studied ruby is most likely related to the high-temperature metamorphic event in the marbles during the India–Asia collision. Our study not only confirms that texturally constrained titanite could be a precise geochronometer to date the mineralization of different types of ruby, but also provides important geochronological information linking gemstone formation to the India–Asia collision.

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“…Besides, for the same sample, different observation points or areas selected will also cause different final outcomes. This kind of non-uniformity exists locally in nephrite and makes analyzing method of trace elements loose the scope for displaying its abilities in the study of provenance [14].…”

Section: Introductionmentioning

confidence: 99%

Sub-microstructures of Nephrite from Five Sources Based on Multispectral Imaging and Effect Enhancement

Chen

Wei

et al. 2020

AJARR

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Some collectors and connoisseurs have found that the nephrite from different sources possess different sub-microstructures inside the body, which could become a quite convenient and effective basis for determining provenance. The sub-microstructure of nephrite can be observed by the naked eye under irradiated by strong light. However, the images of original submicrostructure of nephrite were recorded by use of multispectral imaging in our previous work, but the visual effect is not satisfied. Here, the main features of different sub-microstructures will present more distinct by appropriately subtracting the shining strength and then the average filtering is adopted to promote the resolution of sub-microstructure imaging as well as to reduce some image noises. The sub-microstructure images of nephrite from five most common sources have typical inherent characteristics respectively, which are qualified to set up a demonstration for identifying provenances. Furthermore, the shape, size, distribution and name for these different sub-microstructures have been summarized and they will become the basis for future research on the provenance of nephrite including the ancient jade.

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Age determination of nephrite by in-situ SIMS U–Pb dating syngenetic titanite: A case study of the nephrite deposit from Luanchuan, Henan, China

Cited by 38 publications

References 45 publications

Origin of Talc and Fe-Ti-V Mineralization in the Kletno Deposit (the Śnieżnik Massif, SW Poland)

Origin of Talc and Fe-Ti-V Mineralization in the Kletno Deposit (the Śnieżnik Massif, SW Poland)

~25 Ma Ruby Mineralization in the Mogok Stone Tract, Myanmar: New Evidence from SIMS U–Pb Dating of Coexisting Titanite

Sub-microstructures of Nephrite from Five Sources Based on Multispectral Imaging and Effect Enhancement

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