Melting of amphibolites and the form of melt-trap in amphibolite-migmatites of the southern Hidaka metamorphic belt, Hokkaido, Japan.

美智雄, 田切; 久雄, 田中; 正敏, 柴

doi:10.2465/ganko.90.50

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The pelitic-psammitic rocks of the Aoyama area ubiquitously contain plagioclase and quartz and, therefore, the muscovite-consuming reaction may well have contained albite as a reactant. In the sillimanite -Kfeldspar zone, the migmatite texture is rare, and evidence for the occurrence of partial melting, such as crystal faces of K-feldspar against quartz or euhedral plagioclase (e.g., Vernon & Collins 1988, Tagiri et al 1995 is only locally found (Kawakami 2001). This observation may imply that the dehydration-melting reaction Ms + Ab + Qtz = Kfs + Sil + melt 4did not take place in the sillimanite -K-feldspar zone, even at the peak temperature.…”

Section: P-t Path Of the Aoyama Areamentioning

confidence: 99%

Boron Depletion Controlled by the Breakdown of Tourmaline in the Migmatite Zone of the Aoyama Area, Ryoke Metamorphic Belt, Southwestern Japan

Kawakami¹

2001

The Canadian Mineralogist

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A drastic drop of whole-rock boron contents is observed across the tourmaline-out isograd located near the schist-migmatite boundary of the Aoyama area, Ryoke metamorphic belt, southwestern Japan. The variation in whole-rock boron contents corresponds well with the modal proportion of tourmaline; most of the boron is contained in tourmaline in the upper-amphibolitefacies metasedimentary rocks. The drastic drop in whole-rock boron contents, from 10-79 to <5 ppm across the tourmaline-out isograd, may be caused by the breakdown of tourmaline accompanied by the extraction of a small amount of boron-bearing melts or fluids from the migmatite zone. Tourmaline-bearing pegmatite veins observed to the north of the tourmaline-out isograd are one of the important sinks of boron considered to have been extracted from the migmatite zone. The behavior of boron in muscovite and tourmaline is modeled on the P-T path of the Aoyama area. Near the P-T conditions of its breakdown, the X ⅪAlNa-1 Mg-1 exchange is insignificant in tourmaline, whereas the Al 2 Mg-1 Si-1 , AlOMg-1 (OH)-1 and CaMg 2 X Ⅺ-1 Y Al-2 or CaMgO X Ⅺ-1 Y Al-1 (OH)-1 exchanges are important. The amount of the X-site vacancy is controlled by the incorporation of Ca into tourmaline.

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Section: P-t Path Of the Aoyama Areamentioning

confidence: 99%

Boron Depletion Controlled by the Breakdown of Tourmaline in the Migmatite Zone of the Aoyama Area, Ryoke Metamorphic Belt, Southwestern Japan

Kawakami¹

2001

The Canadian Mineralogist

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“…5) Cr 1 (Cortesogno et al, 2000;Coogan et al, 2001) TiO 2 Cr 2 O 3 1 wt% (Shiba, 1988;Kagami, 1994, 1996;Tagiri et al, 1995;1997;1997;1997) ( Fig. 1) Cr 2 O 3 1 wt% Cr ( ) (Bamba et al, 1969;1972, 1980 Katoh and Niida (1983) (Takahashi, 1991;Furusho and Kanagawa, 1999) 3.…”

Section: Cr 2 O 3 Crmentioning

confidence: 99%

Petrology of a peculiar amphibolite boulder rich in deep vivid green-colored amphibole porphyroblast from Hidaka Town, Hokkaido, Japan

Morishita¹,

Arai²,

Tamura³

et al. 2008

Japanese Magazine of Mineralogical and Petrological Sciences

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A peculiar amphibolite rich in deep vivid green colored amphibole porphyroblast was found as a boulder in the Chiroro River of Hidaka Town, Hokkaido, Japan. The amphibolite mainly consists of deep vivid green colored amphibole (porphyroblast), colorless amphibole (matrix) and plagioclase with a small amount of chlorite, epidote and chromian spinel. Deep vivid green colored amphibole porphyroblast is more than 20 modal % in the rock. Chromian spinel rarely occurs as inclusions in deep vivid green colored amphibole porphyroblast. The Cr 2 O 3 content of the deep vivid green colored domain is usually ~1 wt% (up to 2.5 wt% nearby chromian spinel) whereas that of colorless amphibole in the matrix is low, < 0.1 wt%. Deep vivid green colored amphibole porphyroblast is heterogeneous in chemical compositions within each grain and is divided into three domains as follows: (1) high Cr 2 O 3 (~1 wt%, up to 2.5 wt%) and Al 2 O 3 (> 10 wt%) green colored domain, (2) relatively high Cr 2 O 3 (~1 wt%) and low Al 2 O 3 (< 10 w%) green colored domain and (3) low Cr 2 O 3 (< 0.1wt%) and Al 2 O 3 (< 10 wt%) colorless domain. Chondrite normalized rare earth element (REE) patterns of both deep vivid green colored amphibole porphyroblast and colorless amphibole in the matrix are characterized by low light REE with positive Eu anomaly. The Cr#[= Cr/(Cr + Al) atomic ratio] and TiO 2 content of chromian spinel in the amphibolite are similar to those in a serpentinite complex of the Kamuikotan Zone. The amphibolite was formed by either amphibolitization of a rock containing chromian spinel derived from the surrounding serpentinite complex or extensively metasomatized serpentinite due to interaction with surrounding metamorphic rocks.

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Thermal History of the Horoman Peridotite Complex: A Record of Thermal Perturbation in the Lithospheric Mantle

Ozawa¹

2004

Journal of Petrology

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Melting of amphibolites and the form of melt-trap in amphibolite-migmatites of the southern Hidaka metamorphic belt, Hokkaido, Japan.

Cited by 4 publications

References 12 publications

Boron Depletion Controlled by the Breakdown of Tourmaline in the Migmatite Zone of the Aoyama Area, Ryoke Metamorphic Belt, Southwestern Japan

Boron Depletion Controlled by the Breakdown of Tourmaline in the Migmatite Zone of the Aoyama Area, Ryoke Metamorphic Belt, Southwestern Japan

Petrology of a peculiar amphibolite boulder rich in deep vivid green-colored amphibole porphyroblast from Hidaka Town, Hokkaido, Japan

Thermal History of the Horoman Peridotite Complex: A Record of Thermal Perturbation in the Lithospheric Mantle

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