Melting and Multi-stage Metasomatism in the Mantle Wedge beneath a Frontal Arc Inferred from Highly Depleted Peridotite Xenoliths from the Avacha Volcano, Southern Kamchatka

Ishimaru, Satoko; Arai, Shoji; Ishida, Yoshito; Shirasaka, Miki; Okrugin, Victor M.

doi:10.1093/petrology/egl065

Cited by 180 publications

(132 citation statements)

References 84 publications

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“…An "intermediate" hypothesis is that the formation of amphibole-rich veins is related to interaction with the host lava (or a similar adakitic melt percolating the dunites before their uplift by the host lava), and that the orthopyroxene-rich veins are related to the circulation of a different type of slab-derived melt/fluid prior to the incorporation of the dunites within the host lava. The comparison of our data with the compositions of southern Kamchatka mantle peridotite xenoliths (Ishimaru et al, 2007) and with the experimental results of Prouteau and Scaillet (2003) gives strong support to this "intermediate" hypothesis. Indeed, Ishimaru et al (2007) describe southern Kamchatka peridotite xenoliths coated by hornblendites forming thin selvages as well as veinlets cutting the xenoliths.…”

Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltssupporting

confidence: 80%

“…The comparison of our data with the compositions of southern Kamchatka mantle peridotite xenoliths (Ishimaru et al, 2007) and with the experimental results of Prouteau and Scaillet (2003) gives strong support to this "intermediate" hypothesis. Indeed, Ishimaru et al (2007) describe southern Kamchatka peridotite xenoliths coated by hornblendites forming thin selvages as well as veinlets cutting the xenoliths. Similar features have been observed in other sub-arc mantle xenoliths exhumed by arc magmas and especially in those from Iraya volcano, Batan island, Philippines ( [Vidal et al, 1989], [Maury and Didier, 1991] and [Arai et al, 1996]).…”

Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltssupporting

confidence: 80%

“…Moreover, the orthopyroxene-rich veins crosscutting the Monglo dunite xenoliths contain orthopyroxenes exhibiting complex fibrous textures similar to those of the metasomatic orthopyroxenes from Lihir and southern Kamchatka mantle xenoliths ( , and [Ishimaru et al, 2007]). Such fibrous textures have been related by the authors to low-viscosity hydrous metasomatic agents.…”

Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltsmentioning

confidence: 99%

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Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines)

Grégoire

Jégo

Maury

et al. 2008

Lithos

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somatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines). Lithos, Elsevier, 2008, 103 (3-4) AbstractThe Monglo adakite contains mafic and ultramafic xenoliths, which probably originated from the mantle section of an Early Cretaceous supra-subduction zone ophiolitic complex located within the Luzon arc crust. Spinel-bearing dunites are dominant among this xenolith collection and display evidence for three episodes of subduction-related melt percolation. The first one is evidenced by an undeformed clinopyroxene characterized by convex-upwards REE pattern. This clinopyroxene crystallized from a calc-alkaline basaltic magma, likely formed in the Cretaceous supra-subduction setting of the ophiolite. Then, two metasomatic events, evidenced by orthopyroxene-rich and amphibole-rich secondary parageneses, respectively, affected most of the spinel dunites. The opx-rich paragenesis is related to the circulation within the dunitic upper mantle of hydrous slab-derived melts similar to those affecting the mantle peridotite xenoliths from Papua New Guinea and Kamchatka. Finally the amphibole-rich veins are related to the interaction between the studied dunite xenoliths and the host adakite or an adakitic melt similar to it.

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Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltssupporting

confidence: 80%

Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltssupporting

confidence: 80%

Section: Dunite Metasomatism By Adakitic and Other Slab-related Meltsmentioning

confidence: 99%

See 1 more Smart Citation

Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines)

Grégoire

Jégo

Maury

et al. 2008

Lithos

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“…The xenoliths record temperatures of 800 -1050°C, as indicated by Ca contents in orthopyroxene [Brey and Köhler, 1990]. These temperatures could reflect the temperature gradient of the uppermost mantle beneath the volcanic front [Ishimaru et al, 2007]; consequently, we infer that the peridotite xenoliths were derived from the uppermost part of the low-velocity zone in the mantle.…”

Section: Samples and Methodsmentioning

confidence: 83%

“…[4] The Avacha (=Avachinsky) volcano is part of the frontal chain that forms the volcanic front (VF) of the Kamchatka arc, and is famous for producing peridotite xenoliths derived from the mantle beneath the volcanic front [e.g., Kepezhinskas et al, 1995;Arai et al, 2003;Ishimaru et al, 2007]. The volcano is located in the southern part of the Kamchatka Peninsula, which is a relatively mature arc (Figure 1).…”

Section: Geological Settingsmentioning

confidence: 99%

Rock seismic anisotropy of the low‐velocity zone beneath the volcanic front in the mantle wedge

Michibayashi¹,

Oohara²,

Satsukawa³

et al. 2009

Geophysical Research Letters

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Peridotite xenoliths derived from the low velocity zone beneath the Avacha frontal volcano, Kamchatka, preserve a‐axis slip fabrics, comparable with those in xenoliths from the back‐arc region of the NE Japan. Although low‐velocity zones are commonly attributed to zones of partially melted mantle, migration of the melt does not erase the existing olivine fabrics and related seismic anisotropies. These anisotropies may counteract the anisotropies associated with c‐axis slip fabrics, if they exist, along the slab or in the high‐pressure zone.

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Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

Zhang

Fan

et al. 2018

JGR Solid Earth

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Synchrotron‐based high‐pressure and temperature single‐crystal X‐ray diffraction experiments were conducted on two hydrous orthoenstatite samples (oEn#1: Mg1.004Si0.996O3, ~619 ppm water; oEn#2: Mg0.947Ni0.055Si0.998O3, ~696 ppm water) to ~34 GPa and 700 K, using resistively heated diamond anvil cells. The α‐opx (Pbca space group)→β‐opx (P21/c space group) phase transition of oEn#1 occurs at 12.90(2) GPa, and the β‐opx phase persists to 34.25(1) GPa. The α‐β transition of oEn#2 occurs at 13.50(1) GPa, and a new isosymmetric β‐opx→β‐opxII transition takes place at 29.80(4) GPa. The β‐opxII phase is preserved down to 24.53(3) GPa during decompression. The transition to the monoclinic β‐opxII phase is interpreted as a result of incorporation of Ni2+ into the orthoenstatite structure. Fitting the third‐order Birch‐Murnaghan thermal equation of state to the single‐crystal P‐V‐T data yields the thermoelastic parameters of the α‐ and β‐opx phases for both orthoenstatite samples. This study is the first attempt to determine the thermal equation of state of the β‐opx phase. Our results suggest that several hundred ppm of water has negligible effects on the bulk modulus of orthoenstatite but notably enhances the thermal expansion. The potential effects of metastable orthoenstatite on subduction zone dynamics are discussed, and the possible contributions of displacive phase transitions to enhancement of the transformational faulting mechanism of the deep‐focus earthquakes in subducted slabs are considered. The presence of metastable orthoenstatite within cold slabs could promote slab stagnation above the 660‐km discontinuity.

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Melting and Multi-stage Metasomatism in the Mantle Wedge beneath a Frontal Arc Inferred from Highly Depleted Peridotite Xenoliths from the Avacha Volcano, Southern Kamchatka

Cited by 180 publications

References 84 publications

Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines)

Metasomatic interactions between slab-derived melts and depleted mantle: Insights from xenoliths within Monglo adakite (Luzon arc, Philippines)

Rock seismic anisotropy of the low‐velocity zone beneath the volcanic front in the mantle wedge

Phase Transitions in Orthoenstatite and Subduction Zone Dynamics: Effects of Water and Transition Metal Ions

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