Insights into Petrological Characteristics of the Lithosphere of Mantle Wedge beneath Arcs through Peridotite Xenoliths: a Review

Arai, Shoji; Ishimaru, Satoko

doi:10.1093/petrology/egm069

Cited by 179 publications

(81 citation statements)

References 174 publications

(431 reference statements)

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“…from Dick and Bullen (1984), Arai (1994), and Arai et al (2011). Arc -related peridotite fields are from Arai and Ishimaru (2008) and Arai et al (2011). Arrow (A to A') indicates the variation along the profile of surrounding harzburgites, from the contact with dunite to the distal part.…”

Section: Mineral Chemistry Major Elementsmentioning

confidence: 99%

Formation of discordant chromitite at the initiation of sub-arc mantle processes: Observations from the northern Oman ophiolite

Miura

Arai

Tamura

2014

Journal of Mineralogical and Petrological Sciences

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Discordant chromitite, one of the structural types of ophiolitic chromitite, and surrounding peridotites, were examined in the mantle section of the northern Oman ophiolite along Wadi Hilti, to constrain its origin. Spinels from chromitite and adjacent peridotites show high Cr# (= Cr/(Cr + Al) atomic ratio), around 0.65 to 0.75, indicating an arc -related feature. Clinopyroxenes from adjacent harzburgites show low HREE contents, indicating a highly depleted character. The calculated melt composition in equilibrium with clinopyroxene in the dunite envelope indicates that the chromitite and surrounding peridotites were derived from arc -related magma, such as boninite. The arc -related magma was probably generated by the flux melting of depleted mantle harzburgite on the subducted slab, in terms of incompatible element enrichment in clinopyroxene from dunite and harzburgite. The highly depleted harzburgite surrounding discordant dunite and chromitite shows transitional changes in spinel and REE chemistry toward the surrounding oceanic harzburgites. This feature indicates that pre -existing oceanic harzburgite was partially modified by arc -related magma. Discordant chromitite, dunite, and highly depleted harzburgites are probably formed at the supra -subduction zone environment just before ophiolite obduction. Such arc -related features in mantle peridotite may be produced at a young sub -arc mantle.

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Section: Mineral Chemistry Major Elementsmentioning

confidence: 99%

Formation of discordant chromitite at the initiation of sub-arc mantle processes: Observations from the northern Oman ophiolite

Miura

Arai

Tamura

2014

Journal of Mineralogical and Petrological Sciences

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“…2 and 3). Wehrlites are quite common as xenoliths from arc settings (e.g., Arai et al, 2000;Arai and Ishimaru, 2008). This contrast is possibly due to the difference in the order of crystallization of minerals in the melt involved in or resulting from the reaction; olivine was followed by plagioclase in Hess Deep, but by clinopyroxene in Wadi Fizh.…”

Section: Discussionmentioning

confidence: 99%

Petrologic profile of peridotite layers under a possible Moho in the northern Oman ophiolite: an example from Wadi Fizh

Akizawa

Arai

2009

Journal of Mineralogical and Petrological Sciences

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We examined vertical variations of the petrological characteristics of a 33 -m -thick peridotite section under the layered gabbro section along Wadi Fizh of the northern Oman ophiolite to understand the formation mechanism of the Mohorovicic discontinuity (Moho) beneath a spreading center. Here, we refer to the base of the layered gabbro section as "L -Moho" for the sake of simplicity. Network -like gabbro sills in peridotites increase in frequency upward to the L -Moho. The L -Moho is underlain by a 1 -m -thick wehrlite layer, under which exists a 10 -m -thick dunite layer, overlying a harzburgite layer where total pyroxenes slightly increase downward. Wehrlite is also found as screens between gabbro layers above the L -Moho. The mineral chemistry indicates systematic variations toward the L -Moho within the peridotite section; the Fo content (91 to 85) and NiO (0.4 to 0.2 wt%) of olivine decrease; the TiO 2 content of clinopyroxene (0.1 to 0.6 wt%) and spinel (nil to 1.4 wt%) and atomic ratios of Cr/(Cr + Al) (0.5 to 0.6) and Fe 3+ /(Cr + Al + Fe 3+ ) (0.05 to >0.1) in spinel increase upsection from the base (harzburgite) to the around L -Moho wehrlite via dunite. These variations are essentially similar to those observed in harzburgite/MORB reaction products from Hess Deep, East Pacific Rise, and possibly indicate that the lithological and mineral chemical variations within the examined peridotite layer resulted from the reaction between a harzburgite and a melt that produced the layered gabbros.

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“…Appropriate bulk rock compositions of the mantle wedge that becomes serpentinized can be inferred from peridotite xenoliths in arc magmas (Arai and Ishimaru, 2008) and forearc peridotite exposed at trench slopes (Parkinson and Pearce, 1998). Extensive partial melting of mantle wedge in wet conditions results in a mantle consisting dominantly of harzburgite and dunite with olivine (Ol) making up more that >70 vol% and smaller amounts of orthopyroxene (Opx).…”

Section: Two Types Of Antigorite Serpentinitementioning

confidence: 99%

Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab–mantle interface

Mizukami

Yokoyama

Hiramatsu

et al. 2014

Earth and Planetary Science Letters

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It is known that plate boundaries in subduction zones show heterogeneous slip nature with strongly coupled seismogenic zones and various types of episodic tremor and slip (ETS) zones. In order to examine the petrological controls on the large-scale structure, we compared recent geophysical observations in the Shikoku area, southwest Japan with petrological models of the hanging wall mantle wedge. As a result, we found a close relationship between mineral assemblages in the mantle wedge and the characteristics of slow slip behaviour recorded in the Shikoku area: Short-term ETSs take place in the antigorite + olivine stability field and silent long-term slow slip events

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Insights into Petrological Characteristics of the Lithosphere of Mantle Wedge beneath Arcs through Peridotite Xenoliths: a Review

Cited by 179 publications

References 174 publications

Formation of discordant chromitite at the initiation of sub-arc mantle processes: Observations from the northern Oman ophiolite

Formation of discordant chromitite at the initiation of sub-arc mantle processes: Observations from the northern Oman ophiolite

Petrologic profile of peridotite layers under a possible Moho in the northern Oman ophiolite: an example from Wadi Fizh

Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab–mantle interface

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