The Petrology of a Melilite-Olivine Nephelinite from Hamada, SW Japan

Tatsumi, Yoshiyuki; Arai, R.; Ishizaka, Kyoichi

doi:10.1093/petroj/40.4.497

Cited by 29 publications

(20 citation statements)

References 31 publications

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“…Therefore relatively high pressure melting of carbonated peridotite could play a role in generating the CaO‐rich, silica‐undersaturated melts identified in this study [ Della‐Pasqua and Varne , 1997]. However, we consider this unlikely based on the significant differences between the CaO‐rich, silica‐undersaturated arc magmas identified in this study and both experimental melts obtained at high pressures for natural and simple carbonated peridotite systems [ Dalton and Presnall , 1998; Hirose , 1997b] and primitive melilitites, nephelinites, and related rocks from oceanic, continental and arc regions [ Alibert et al , 1983; Dupuy et al , 1989; Wedephol et al , 1994; Wilson et al , 1995; Maaloe et al , 1992; Hoernle and Schmincke , 1993; Clague and Frey , 1982; Cheng et al , 1993; Tatsumi et al , 1999], which are widely considered to be melts of carbonated peridotite [ Eggler , 1978; Huang and Wyllie , 1974; Eggler , 1974; Adam , 1988; Hirose , 1997b; Brey and Green , 1975; Brey , 1978; Wallace and Green , 1988]. For example, the CaO‐rich, silica‐undersaturated arc magmas identified here have higher SiO 2 and Al 2 O 3 and lower MgO contents at a given CaO content than do the experimental melts obtained at high pressures for natural and simple carbonated peridotite systems (Figure 7).…”

Section: Comparison Of the Composition Of Cao‐rich Melts With Experimmentioning

confidence: 90%

“…Compositions are normalized to the average NMORB composition of Hofmann [1988]. (b) Plot of La/Yb ratio versus La concentration comparing data for Batan melt inclusions with data for primitive melilitites [ Wilson et al , 1995], nephelinites from oceanic and continental regions [ Wedephol et al , 1994; Hoernle and Schmincke , 1993], nephelinites from SW Japan [ Tatsumi et al , 1999], and carbonatites from Africa, Australia, Europe, and North and South America [ Nelson et al , 1988]. Symbols are given in the accompanying legend, and the distinction between trend A and trend B for the Batan samples is the same as in Figure 1.…”

Section: Definition Of a Distinctive Cao‐rich Silica‐undersaturated mentioning

confidence: 99%

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Primitive CaO‐rich, silica‐undersaturated melts in island arcs: Evidence for the involvement of clinopyroxene‐rich lithologies in the petrogenesis of arc magmas

Schiano

Eiler

Hutcheon

et al. 2000

Geochem Geophys Geosyst

113

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[1] Abstract: On the basis of the study of olivine-hosted melt inclusions in a calc-alkaline basalt from Batan Island (Philippines) we define a distinctive type of primitive, nepheline-normative island arc magma characterized by unusually high CaO contents (up to 19.0 wt %) that cannot be simply explained by melting of the metasomatized peridotitic mantle wedge above subducting oceanic lithosphere. CaOrich melt inclusions with these characteristics are preserved in Fo 85 ± 90 olivine, and compositional variations among the inclusions are interpreted to reflect mixing between melts such as those found in the most CaO-rich inclusions (present in Fo 90 olivine) and melts similar to primitive``normal'' island arc magmas (trapped in Fo 85 olivine). Compilation of primitive island arc magmas from the literature shows that whole rocks and olivine-hosted melt inclusions with CaO contents >13 wt % are found in many arc volcanoes from all over the world in addition to Batan. These inclusions occur in lavas ranging from CaO-rich ankaramites to basaltic andesites with low-CaO contents (i.e., <13 wt %). The globally occurring CaO-rich inclusions and whole rocks comprise a group that although defined on the basis of their CaO contents is compositionally distinctive when compared to island arc lavas that have lower CaO contents; for example, they have lower FeO at a given SiO 2 content than most arc lavas, and they are all nepheline normative, with normative nepheline contents positively correlated with CaO contents. Variations in CaO content and normative compositions of experimental partial melts of lherzolite related to changes of pressure, temperature, and source composition suggest that there are no conditions under which partial melting of peridotite can generate melts having CaO contents and other properties comparable to those observed for the primitive, CaO-rich arc-derived melts identified here. Although melting of peridotite at high pressure in the presence of CO 2 can produce CaO-rich, silica-poor liquids, Geochemistry Geophysics Geosystemswe consider it unlikely that this is responsible for producing the CaO-rich, silica-undersaturated melts considered in this study because there are significant differences in nearly all other compositional characteristics between the CaO-rich arc magmas and melts known or thought to be produced by melting of carbonated peridotite. Model major element compositions of partial melts of clinopyroxene-rich lithologies (mantle pyroxenites, lower crustal pyroxenites, and eclogites) calculated using the MELTS algorithm suggest that the most CaO-rich, nepheline-normative melt inclusions and whole rocks identified here could represent intermediate to high degree ($10±40 wt %) partial melts of pyroxenites at lower crustal to upper mantle pressures. Such a hypothesis is supported by the comparison between the trace element compositions of model pyroxenite sources of the Batan CaO-rich melt inclusions and naturally occurring pyroxenites. The most likely source of the primitive CaO-rich, sili...

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Section: Comparison Of the Composition Of Cao‐rich Melts With Experimmentioning

confidence: 90%

Section: Definition Of a Distinctive Cao‐rich Silica‐undersaturated mentioning

confidence: 99%

Primitive CaO‐rich, silica‐undersaturated melts in island arcs: Evidence for the involvement of clinopyroxene‐rich lithologies in the petrogenesis of arc magmas

Schiano

Eiler

Hutcheon

et al. 2000

Geochem Geophys Geosyst

113

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“…), San-in (Iwamori, 1992;Kimura et al, 2004, personal commun. ;Tatsumi et al, 1999), and Sanyo (Iwamori, 1992) zones are characterized by alkali suite magmas in stage III, although some are transitional between LAT and alkali basalt (Figs. 4 and 5).…”

Section: Stage IIImentioning

confidence: 99%

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Kimura

Stern

Yoshida

2005

Geol Soc America Bull

222

266

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Southwestern Japan during Paleogene time was affected by subduction of the Kula and Pacifi c plates beneath the eastern margin of Eurasia, followed by a brief episode of transform faulting to allow the Shikoku Basin to open at 27-15 Ma. Subsequent opening of the Japan Sea back-arc basin in middle Miocene time broke Japan away from Eurasia, and SW Japan rotated clockwise ~45º as it drifted south (17-15 Ma). Southward drift required subduction of the Philippine Sea plate beneath SW Japan, leading to the formation of a magmatic arc. Subduction of the hot Shikoku Basin lithosphere and spreading ridge resulted in distinctive volcanism in the SW Japan forearc between 17 and 12 Ma. This volcanism included midoceanic-ridge basalt (MORB)-like intrusions and oceanic-island basalt (OIB)-type alkali basalts, felsic plutons in the accretionary prism, and high-magnesium andesites along the Setouchi forearc basin. Mafi c magmas in the outermost forearc originated from the subducted Shikoku Basin spreading ridge, whereas Setouchi high-magnesium andesites (HMA) may have resulted from the interaction of melts of the subducted Philippine Sea plate with the overlying mantle. Felsic magmas in the forearc resulted from melting of Shimanto Belt sediments caused by intrusion of HMA magmas. Persistent rear-arc volcanism was caused by upwelling asthenosphere associated with opening of the Sea of Japan. Rear-arc volcanism began ca. 25 Ma as rift-fi ll low-alkali tholeiite volca-nism and was replaced gradually after 12 Ma by alkali basalt volcanism. Upwelling-related alkali volcanism continues up to the present, whereas forearc volcanism ceased at 12 Ma.The volcanic arc narrowed with time as the Philippine Sea slab descended and slowly cooled. Adakitic dacites erupted after 1.7 Ma above the 100-km-depth contour of the subducted Philippine Sea plate, suggesting that melting resulted from interaction of the slab with upwelling asthenosphere. Interactions between upwelled rear-arc asthenosphere and subduction of the hot Philippine Sea slab appear to have been the main controls of magmatism for the Neogene SW Japan arc.

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“…Many models have been proposed for magma genesis in the SW Japan arc. The models include an enriched lithospheric mantle origin of OIB [ Hoang and Uto , ; Kakubuchi et al ., ], aqueous fluid‐fluxed mantle melting for AB [ Iwamori , ], carbonaceous melt‐fluxed melting for Miocene OIB [ Tatsumi et al ., ], hydrous shallow mantle melting with residual phlogopite for SHO [ Tatsumi and Koyaguchi , ], slab melt‐fluxed mantle melting for HMA [ Kimura et al ., ; Shimoda et al ., ; Tatsumi and Hanyu , ], slab melting for ADK [ Feineman et al ., ; Kimura et al ., ; Morris , ], remelting of solidified andesite for ADK [ Tamura et al ., ], and deep garnet fractionation of hydrous basalt for ADK [ Zellmer et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

Kimura

Gill

Kunikiyo³

et al. 2014

Geochem Geophys Geosyst

211

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In response to the subduction of the young Shikoku Basin of the Philippine Sea Plate, arc magmas erupted in SW Japan throughout the late Cenozoic. Many magma types are present including ocean island basalt (OIB), shoshonite (SHO), arc-type alkali basalt (AB), typical subalkalic arc basalt (SAB), high-Mg andesite (HMA), and adakite (ADK). OIB erupted since the Japan Sea back-arc basin opened, whereas subsequent arc magmas accompanied subduction of the Shikoku Basin. However, there the origin of the magmas in relation to hot subduction is debated. Using new major and trace element and Sr-Nd-Pb-Hf isotope analyses of 324 lava samples from seven Quaternary volcanoes, we investigated the genetic conditions of the magma suites using a geochemical mass balance model, Arc Basalt Simulator version 4 (ABS4), that uses these data to solve for the parameters such as pressure/temperature of slab dehydration/melting and slab flux fraction, pressure, and temperature of mantle melting. The calculations suggest that those magmas originated from slab melts that induced flux melting of mantle peridotite. The suites differ mostly in the mass fraction of slab-melt flux, increasing from SHO through AB, SAB, HMA, to ADK. The pressure and temperature of mantle melting decreases in the same order. The suites differ secondarily in the ratio of altered oceanic crust to sediment in the source of the slab melt. The atypical suites associated with hot subduction result from unusually large mass fractions of slab melt and unusually cool mantle temperatures.

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The Petrology of a Melilite-Olivine Nephelinite from Hamada, SW Japan

Cited by 29 publications

References 31 publications

Primitive CaO‐rich, silica‐undersaturated melts in island arcs: Evidence for the involvement of clinopyroxene‐rich lithologies in the petrogenesis of arc magmas

Primitive CaO‐rich, silica‐undersaturated melts in island arcs: Evidence for the involvement of clinopyroxene‐rich lithologies in the petrogenesis of arc magmas

Reinitiation of subduction and magmatic responses in SW Japan during Neogene time

Diverse magmatic effects of subducting a hot slab in SW Japan: Results from forward modeling

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