Evidence for melt segregation towards fractures in the Horoman mantle peridotite complex

Takahashi, Natsuko

doi:10.1038/359052a0

Cited by 108 publications

(70 citation statements)

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“…To explain such compositional layering, three models have been proposed: (1) successive fractional crystallization [Niida, 1984], (2) permeable flow of partial melt from an ascending homogeneous mantle [Obta and Nagahara, 1987], and (3) melt segregation by suction with local melting along a fracture in the ascending mantle [Takahashi, 1991b[Takahashi, , 1992.…”

Section: Formation Of Compositional Layering In the Orogenic Lherzolitesmentioning

confidence: 99%

Geochemical evolution of the Horoman peridotite complex: Implications for melt extraction, metasomatism, and compositional layering in the mantle

Yoshikawa¹,

Nakamura²

2000

J. Geophys. Res.

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Section: Formation Of Compositional Layering In the Orogenic Lherzolitesmentioning

confidence: 99%

Geochemical evolution of the Horoman peridotite complex: Implications for melt extraction, metasomatism, and compositional layering in the mantle

Yoshikawa¹,

Nakamura²

2000

J. Geophys. Res.

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“…The complex is 8 × 10 km 2 in area and more than 3 km in thickness, and consists of various kinds of peridotite with small amounts of mafic rocks (e.g., Igi, 1953;Komatsu and Nochi, 1966;Niida, 1984;Takahashi, 1991Takahashi, , 1992Takazawa et al, 1992Takazawa et al, , 1999Takazawa et al, , 2000Yoshikawa and Nakamura, 2000;Sawaguchi 2004). Symplectites occur in spinel lherzolite, which is usually sandwiched between plagioclase lherzolite and harzburgite on various scales (Takahashi, 1991;Takazawa et al, 2000).…”

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

Formation and deformation mechanisms of pyroxene-spinel symplectite in an ascending mantle, the Horoman peridotite complex, Japan: An EBSD (electron backscatter diffraction) study

Odashima

Morishita

Ozawa

et al. 2007

Journal of Mineralogical and Petrological Sciences

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Symplectites, fine vermicular intergrowth (< 10 μm) of orthopyroxene, clinopyroxene, and spinel, and the surrounding lenticular coarser grained (100 200 μm) aggregate (seam) with the same mineral assemblage of the symplectites define remarkable foliation and lineation in spinel lherzolites of the Horoman complex, northern Japan. They are inferred to be products of reaction between garnet and olivine during decompression of the host peridotite accompanying deformation. Microstructure of a symplectite was investigated with automated electron backscattered diffraction (EBSD) analysis using a field emission gun SEM (FE SEM) in order to clarify reaction and deformation mechanisms and thereby better constraining mechanical interaction between the Earth's upper mantle and lower crust. The symplectite is composed of two segments with a large misorientation angle of ~ 60° only for spinel, and the two spinel crystals are in mirror symmetry with the segment boundary approximately parallel to the mirror plane. The segment boundary is interpreted as spinel law twin formed during phase transition from garnet. Each segment is further subdivided into several sectors with gradual lattice distortion smaller than a few degrees/mm and intra sector misorientation mostly smaller than 25° for all constituent minerals and with misorientation axes nearly perpendicular to the lineation and parallel to the foliation. The sector boundaries are inferred to be subgrain boundaries formed by dislocation creep of pyroxenes and spinel in the spinel stability field. The spinel twin suggests that a garnet was decomposed directly into entangled aggregate of pyroxenes and spinel, which grew from an embryo nucleated on the surface of the reactant garnet. The symplectite minerals in each sector show systematic crystallographic orientations (topotaxy) with each other. The topotaxial relationship in the fine intergrowth with subgrain structure demonstrates that the systematic crystallographic orientations were acquired when the crystals grew by decomposing the garnet and were later modified by deformation during the consecutive ascent of the complex.

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“…( Kushiro and Yoder, 1966;Niida, 1984;Hirai and Arai, 1987;Takahashi and Arai, 1989;1989;Takahashi, 1991Takahashi, , 1992Takahashi, , 2001Ozawa and Takahashi, 1995;Takazawa et al, 1992Takazawa et al, , 1996Takazawa et al, , 1999Takazawa et al, , 2000Yoshikawa et al, 1993;, 1997;Yoshikawa and Nakamura, 2000;Morishita and Arai, 2003;Morishita et al, 2003Morishita et al, , 2004Ozawa, 2004;Sawaguchi, 2004) Takahashi (1991 3…”

mentioning

confidence: 99%

“…1) ( 1966;Niida, 1974Niida, , 1984 (Fig. 1) (Upper Zone) mm 10 m (Lower Zone) ( 10 m 100 m ) ( 1966; Niida, 1984) Takahashi (1991, 1992 ( Fig. 1) (Takahashi, 1991(Takahashi, , 1992Sawaguchi, 2004) MHL SDW BDH Fo Cr# (= Cr/(Cr + Al) ) (Niida, 1984;1997;Takazawa et al, 1999) Niida (1984 (1997) GBI, II, III Takazawa et al (1999) (Takazawa et al, 1996;Yoshikawa and Nakamura, 2000) and ultramafic xenoliths in high Mg andesite from the Kitakami mountains (Tsuchiya et al, 2005) (Takahashi et al, 1987) NiO (Fig.…”

mentioning

confidence: 99%

“…1) (Takahashi, 1991(Takahashi, , 1992Sawaguchi, 2004) MHL SDW BDH Fo Cr# (= Cr/(Cr + Al) ) (Niida, 1984;1997;Takazawa et al, 1999) Niida (1984 (1997) GBI, II, III Takazawa et al (1999) (Takazawa et al, 1996;Yoshikawa and Nakamura, 2000) and ultramafic xenoliths in high Mg andesite from the Kitakami mountains (Tsuchiya et al, 2005) (Takahashi et al, 1987) NiO (Fig. 6a) BDH (Takahashi, 1991) (Takahashi, 1991(Takahashi, , 1992) Type II SDW (Niida, 1984;1997;Takazawa et al, 1999;Morishita and Arai, 2001) Sr Nd MHL (Takazawa et al, 1999 (Yoshikawa and Nakamura, 2000) BDH (Takahashi, 1991(Takahashi, , 1992; ) (Takahashi, 1991, 1992) Takazawa et al (1999 …”

mentioning

confidence: 99%

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Petrology of exotic high-Mg, Cr peridotite bodies in the Horoman Peridotite Complex, Japan

Matsufuji¹,

Arai²,

Morishita³

et al. 2006

Japanese Magazine of Mineralogical and Petrological Sciences

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We investigated exotic peridotite bodies, which are characterized by high Mg, Cr minerals, in the Horoman Peridotite Complex, Japan. The high Mg, Cr peridotites appear to be blocks in specific horizons of a layered structure in the main peridotite body. Foliations and lineations in the high Mg, Cr peridotite are concordant with those in the surrounding peridotites. A clinopyroxene rich high Mg, Cr peridotite (called cpx bearing high Mg, Cr peridotite) was newly discovered. Modal variations and chemical compositions of minerals in the high Mg, Cr peridotites suggest their crystal cumulus origin from a melt rather than residual origin after high degree of partial melting. Trace element characteristics of clinopyroxene in the cpx bearing high Mg, Cr peridotite are similar to those of clinopyroxene related to the formation of a high Mg andesite. Based on results in this study combined with the previous work, the evolutionary history of the Horoman Complex including the high Mg, Cr peridotites is as follows. The high Mg, Cr blocks and the main body of the Horoman were formed at different tectonic settings, a subduction related environment and a mid ocean spreading ridge, respectively. As the tectonic setting of the main body was changed from an ocean floor to a subducting oceanic lithosphere, the high Mg, Cr peridotites could be incorporated into the main body as tectonic blocks during the subduction of the main body. Then these diverse rocks were simultaneously deformed during their exhumation from the upper mantle conditions to the surface.

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Evidence for melt segregation towards fractures in the Horoman mantle peridotite complex

Cited by 108 publications

References 20 publications

Geochemical evolution of the Horoman peridotite complex: Implications for melt extraction, metasomatism, and compositional layering in the mantle

Geochemical evolution of the Horoman peridotite complex: Implications for melt extraction, metasomatism, and compositional layering in the mantle

Formation and deformation mechanisms of pyroxene-spinel symplectite in an ascending mantle, the Horoman peridotite complex, Japan: An EBSD (electron backscatter diffraction) study

Petrology of exotic high-Mg, Cr peridotite bodies in the Horoman Peridotite Complex, Japan

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