A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

Yui, Tzen‐Fu; Fukuyama, Mayuko

doi:10.1016/j.jseaes.2015.04.022

Cited by 16 publications

(14 citation statements)

References 53 publications

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“…Then, the Tone jadeitite provided several reliable criteria for recognition of the R-type petrogenesis based on the geochronological and geochemical studies of the zircon (Mori et al, 2008(Mori et al, , 2010(Mori et al, , 2011Yui et al, 2012). By applying the similar criteria, Yui and Fukuyama (2015) and Hertwig et al (2016) concluded that the Yorii jadeite-quartz rock in Japan (Hirajima, 1983) and some of the Rio San Juan jadeitites in Dominican Republic have the R-type origin. The next question is the relationship between the Ptype and R-type jadeitites such as the timing and site of formation.…”

Section: Possible Tectonic Settingmentioning

confidence: 99%

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

Nishiyama

Mori

Shigeno

2017

Journal of Mineralogical and Petrological Sciences

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The Nishisonogi jadeitite is a peculiar example among Japanese jadeitites in terms of the age of formation and its genesis as metasomatic replacement (R-type). The Nishisonogi jadeitite is characterized by jadeite with a quartzinclusion-rich core and quartz-free rim. The pressure-temperature (P-T ) conditions of the Nishisonogi jadeitite is constrained by the assemblage of jadeite + quartz and of clinozoisite + paragonite + quartz. The jadeitite occurs as tectonic blocks in a sepentinite mélange together with metasomatic rocks such as omphacitite, albitite and zoisite rock. The protolith of the jadeitite is likely plagiogranite or adakitic granite as suggested by the rare earth element (REE) pattern of zircon. The zircon has a euhedral core with a U-Pb age of 126 ± 6 Ma with exhibiting sharp and flat boundary with metamorphic rim, which has a U-Pb age of 84 ± 6 Ma. The rim age is almost consistent with the 95-90 Ma age of the peak metamorphism of the coherent schists, as a host of the serpentinite mélange, as determined by 40 Ar/ 39Ar method applied to glaucophane and phengite. Some jadeitite blocks show lithological zonations with albitite and other rocks in scale of several tens of centimeters. These zonations likely formed in the stability field of albite during exhumation of the serpentinite mélange. The isocon analysis of whole rock compositions and the singular value decomposition analysis of mineral reactions show that SiO 2 , Na 2 O, and Fe 2 O 3 evolved from the jadeitite towards serpentinite according to the retrograde reactions.

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Section: Possible Tectonic Settingmentioning

confidence: 99%

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

Nishiyama

Mori

Shigeno

2017

Journal of Mineralogical and Petrological Sciences

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“…The jadeite-quartz rocks are thought to be enclosed in the surrounding serpentinite mélange, because serpentinite boulders are present near the jadeite-quartz rocks. Zircons from jadeite-quartz rock contain mineral inclusions of both primary (igneous, e.g., K-feldspar, biotite, and hematite) and secondary (metasomatic) origin (Yui and Fukuyama, 2015). Thus, previous studies concluded that the jadeite-quartz rock has formed through 'whole-scale metasomatic replacement' process at an age younger than 141 Ma from a protolith aged at 162.2 ± 0.6 Ma Yui and Fukuyama, 2015).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Zircons from jadeite-quartz rock contain mineral inclusions of both primary (igneous, e.g., K-feldspar, biotite, and hematite) and secondary (metasomatic) origin (Yui and Fukuyama, 2015). Thus, previous studies concluded that the jadeite-quartz rock has formed through 'whole-scale metasomatic replacement' process at an age younger than 141 Ma from a protolith aged at 162.2 ± 0.6 Ma Yui and Fukuyama, 2015). The jadeitequartz rocks show a heterogeneous mineral distribution, with two distinct mineralogical domains: patches of dusty jadeite and quartz-rich domains.…”

Section: Geological Backgroundmentioning

confidence: 99%

Chemical composition of fluid inclusions in the Yorii jadeite–quartz rocks from the Kanto Mountains, Japan

Fukuyama

Kawamoto

Ogasawara

2017

Journal of Mineralogical and Petrological Sciences

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Jadeite-quartz rocks from the Yorii area, the Kanto Mountains, central Japan occur as tectonic blocks within serpentinite mélange. Primary two-phase (liquid + vapor) aqueous fluid inclusions are observed in jadeite, quartz, albite and zircon. The fluids trapped in jadeite and quartz are H 2 O with and without CH 4 and show a wide range of salinity (4.7 ± 1.1 wt% NaCl eqv in jadeite; 3.4 ± 0.7 and 13.6 ± 2.0 wt% NaCl eqv in quartz). In this study, we examined the chemical composition of fluid inclusions in quartz from jadeite-quartz rock to understand the characteristics of fluid, which related to the formation of the rocks in the subduction zone. The trace element concentrations of fluid inclusions determined with LA-ICP-MS are enriched in LILE, Li, B, HFSE and transition metals with LILE enriched and relatively HFSE depleted characteristics. These have elemental patterns similar to the HFSE-depleted fluid released from antigorite during subduction, though the orders of magnitude are different. It can be common chemical characteristics of fluid in a subduction zone. There are two possibilities of the chemical composition of the evolved fluid after the formation of jadeite-quartz rocks. HFSE from the fluid can be sequestered into jadeite-quartz rock prior to fluids moving up into a mantle wedge. This process lead the evolved fluids relatively depleted in HFSE and enriched in LILE. Other possibility is that the fluid has same chemical composition of fluid inclusion as the fluid is equilibrated with jadeite-quartz rocks during the jadeite-quartz formation. In both cases, fluid after the metasomatic formation of jadeite-quartz rocks can be relatively enriched in LILE and depleted in HFSE. Magmas generated in subduction zones exhibit distinctive geochemical features of LILE enrichment and HFSE depletion and this characteristic of arc magma can be explained by the behavior of HFSE during the formation of jadeite-quartz rocks.

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“…Jadeite is generally considered to be a high-pressure mineral (Yang, Yang & Long, 2015), which is called the "King of Jade" in China. It generally occurs as block, and is a rare rock type formed in subduction zones with two origins: the wholesale metasomatic replacement and the vein precipitation (Yui & Fukuyama, 2015;Mevel & Kiénast, 1986). Based on possible formation models, here we propose to classify jadeite into two types: fluid precipitates (P-type) and metasomatic replacement (R-type) (Tsujimori & Harlow, 2012).…”

Section: Introductionmentioning

confidence: 99%

Impact of different standard lighting sources on red jadeite and color quality grading

et al. 2019

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The purpose of this paper is to investigate the standard light source for grading and displaying the color of red jadeite and to classify the color. With Raman spectrometer, ultraviolet-visible spectrophotometer and X-ray fluorescence spectrometer, the results show that, the Fe 3+ is the main chromogenic mineral of red jadeite, which negatively correlates with the tonal angle, while the color of red jadeite has a positive correlation with the hematite content. The color of 120 red jadeite samples was examined by collecting the reflective signaled from the sample surface using an integrating sphere with the portable X-Rite SP62 spectrophotometer based on CIE 1976 L*a*b* uniform color space. The color parameters of jadeite samples under D65, A and CWF standard light sources were analyzed. The light spectrum of D65 light source is continuous, relatively smoothed with high color temperature, which makes the sample color close to that under the natural light and can be used as the best evaluation light source. A light source contributes to improve the red tone of jadeite, which is the best light source for commercial display of red jadeite. CWF light source can be used as the auxiliary lighting for color evaluation. The color of red jadeite is divided into five levels from best to worst using K-Means cluster analysis and Fisher discriminant analysis under D65 light source: Fancy Vivid, Fancy Deep, Fancy Intense, Fancy dark and Fancy. ABSTRACTImpact of different standard lighting sources on red jadeite and color quality grading Impacto por diferentes fuentes de iluminación estándar en la clasificación de jadeíta roja y la calidad del color

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A revisit to the Yorii jadeite–quartz rock, the Kanto Mountains, central Japan: Implications for petrogenesis

Cited by 16 publications

References 53 publications

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

Jadeitites and associated metasomatic rocks from serpentinite mélanges in the Nishisonogi unit, Nagasaki Metamorphic Complex, western Kyushu, Japan: a review

Chemical composition of fluid inclusions in the Yorii jadeite–quartz rocks from the Kanto Mountains, Japan

Impact of different standard lighting sources on red jadeite and color quality grading

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