Raman Geobarometry of Quartz Inclusions in Kyanite: Application to Quartz Eclogite from the Gongen Area of the Sanbagawa Belt, Southwest Japan

Tomioka, Yuki; Kouketsu, Yui; Taguchi, Tomoki

doi:10.3749/canmin.2000097

Cited by 4 publications

(2 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this report, we describe needle rutile inclusions in garnet within a quartz-eclogite from the Sanbagawa metamorphic belt in central Shikoku. Many previous petrological studies showed that the eclogite in the Sanbagawa metamorphic belt in central Shikoku has not been reached UHP conditions (e.g., Miyamoto et al, 2007;Tomioka et al, 2022). The characteristics of rutile exsolution lamellae along with the chemical composition of garnet that have not experienced UHP/UHT conditions reported in this study will improve our understanding of Tiin-garnet behavior during high-grade metamorphism.…”

Section: Introductionmentioning

confidence: 56%

“…The Sanbagawa belt in Shikoku has been studied for more than half a century without discovering any coesite, and quartz-eclogite in this area has been reported to be below ultrahigh pressure (Miyamoto et al, 2007;Tomioka et al, 2022). Thus, the identification of rutile exsolution lamellae in garnet grown under eclogite facies conditions from the Sanbagawa belt provides important material evidence that the conditions for the occurrence of rutile exsolution lamellae in nature are satisfied under non-UHP/UHT conditions.…”

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

See 1 more Smart Citation

Rutile exsolution lamellae of garnet in quartz eclogite from the Sanbagawa Belt, Mt. Gongen, central Shikoku, Japan

Takebayashi¹,

KOUKETSU²,

Michibayashi³

2023

Journal of Mineralogical and Petrological Sciences

Self Cite

View full text Add to dashboard Cite

Needle-shaped rutile inclusions occur in garnet within the quartz-eclogite at Mt. Gongen in the Sanbagawa belt, central Shikoku. They are approximately 5-25 µm along the long axis and are typically oriented along three directions, each intersecting at 120°. This indicates that the needle-shaped rutile is a lamella exsolved from the garnet. Garnet with needlerutile inclusions is restricted to the quartz-poor domain of the quartz eclogite sample, which consist of quartz, garnet, omphacite, phengite, epidote, kyanite, and hornblende. Garnet grains with rutile lamellae show a composition of the almandine-pyrope series with 14-21 mol% grossular content. Rutile exsolution lamellae were concentrated in the range of 27-34 mol% pyrope of garnet crystals. The garnet host with rutile lamellae has a higher TiO2 content (TiO2 = 0.06-0.19 wt%) than those in rutile-free areas. These chemical compositional characteristics suggest that Ti was incorporated into the crystal structure during garnet growth and subsequently partially exsolved as rutile lamellae during the retrograde stage. Rutile lamellae in garnet have generally been regarded as indicators of ultrahigh-pressure metamorphism, but the present report from quartz-eclogite of the Sanbagawa belt, where no coesite has been found, provides evidence in a natural sample that the appearance of rutile exsolution lamellae is not necessarily under ultrahigh-pressure conditions.

show abstract

Section: Introductionmentioning

confidence: 56%

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

Rutile exsolution lamellae of garnet in quartz eclogite from the Sanbagawa Belt, Mt. Gongen, central Shikoku, Japan

Takebayashi¹,

KOUKETSU²,

Michibayashi³

2023

Journal of Mineralogical and Petrological Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region

Ujiie,

Nishiyama,

Yamamoto

et al. 2024

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

Deep tectonic tremor downdip of the seismogenic zone in warm subduction zones is thought to occur in the region of high fluid pressures. However, the deformation and fluid processes responsible for tremor are poorly understood. We examined the Tomuru metamorphic rocks on Ishigaki Island, southern Ryukyu Arc, deformed at ∼40 km depth and ∼450°C under epidote‐blueschist metamorphism comparable to the tremor source region in northern Cascadia subduction zone. Here, quartz vein‐rich metapelite and metabasite are repeated many times as a result of duplex underplating. The spatiotemporal relationship between clustered quartz veins and the juxtaposition of metapelite and metabasite suggests that quartz vein formation and duplex underplating are contemporaneous. Viscous shear in metapelite is accommodated by dissolution‐precipitation creep. Metabasite records heterogeneous dehydration, resulting in rheological heterogeneity characterized by greenschist lenses in the foliated blueschist matrix. Viscous shear in the blueschist matrix was mainly accommodated by dissolution‐precipitation creep of glaucophane. Geochemical and strontium‐neodymium isotope analyses indicated that quartz veins were derived from sediment dehydration, whereas dehydration from oceanic crust contributed neither to quartz vein formation nor to fluid overpressures. We suggest that high fluid pressure in the deep tremor source region is primarily controlled by dehydration of subducting sediments, and the clustered quartz veins in underplated rocks correlate with the overpressured tremor source in low shear‐wave velocity zones.

show abstract

分光学と地質学の融合：光を通じて視る地球内部環境

Kouketsu¹

2023

Japanese Magazine of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

Spectroscopy has been widely used in geology since the 1990s because it is non-destructive and easy to analyze. Raman spectroscopy has generally been used to identify mineral phases in geology, but recent studies have proposed new methods to quantitatively estimate the metamorphic pressure (quartz Raman barometry) and peak temperature (Raman carbonaceous material geothermometry). Studies using infrared spectroscopy are also underway to advance our understanding of hydration processes in subduction zones and mantle through the analysis of water in rocks. In addition to the development of new methods using spectroscopy, new tools are also being developed to analyze huge amounts of data through iterative processing, which will enable the extraction of more informative and quantitative results in a shorter time. This paper introduces examples of spectroscopy applications in geology and examines future developments.

show abstract

Raman Geobarometry of Quartz Inclusions in Kyanite: Application to Quartz Eclogite from the Gongen Area of the Sanbagawa Belt, Southwest Japan

Cited by 4 publications

References 37 publications

Rutile exsolution lamellae of garnet in quartz eclogite from the Sanbagawa Belt, Mt. Gongen, central Shikoku, Japan

Rutile exsolution lamellae of garnet in quartz eclogite from the Sanbagawa Belt, Mt. Gongen, central Shikoku, Japan

Duplex Underplating, Sediment Dehydration and Quartz Vein Mineralization in the Deep Tremor Source Region

分光学と地質学の融合：光を通じて視る地球内部環境

Contact Info

Product

Resources

About