Calculation of water-bearing primary basalt and estimation of source mantle conditions beneath arcs: PRIMACALC2 model for WINDOWS

Kimura, Jun–Ichi; Ariskin, A. A.

doi:10.1002/2014gc005329

Cited by 66 publications

(56 citation statements)

References 70 publications

(213 reference statements)

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“…The calculated results and estimated source conditions are next examined (sections 5.3 and 5.4). We used the PRIMACALC2 model [ Kimura and Ariskin , ] for back calculation of the fractionated basalts to estimate the primary basalt compositions (section 5.1). Moreover, we used the OBS1 model [ Kimura and Kawabata , ] for adiabatic melting of a depleted mantle including Si‐rich pyroxenite (section 5.2).…”

Section: Geochemical Modelingmentioning

confidence: 99%

“…In addition, we investigate mantle melting and basalt solidification models with reference to the thick oceanic crust formation in the Yamato Basin. For these objectives, we apply a numerical basalt crystallization model, PRIMACALC2 [ Kimura and Ariskin , ], and a numerical adiabatic mantle melting model, Ocean Basalt Simulator version 1.01 (OBS1) [ Kimura and Kawabata , ]. The former model provides estimations of primary basalt compositions by back calculating fractional crystallization in the crustal magma chamber.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical variations in Japan Sea back‐arc basin basalts formed by high‐temperature adiabatic melting of mantle metasomatized by sediment subduction components

Hirahara

Kimura

Senda

et al. 2015

Geochem Geophys Geosyst

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The Yamato Basin in the Japan Sea is a back-arc basin characterized by basaltic oceanic crust that is twice as thick as typical oceanic crust. Two types of ocean floor basalts, formed during the opening of the Japan Sea in the Middle Miocene, were recovered from the Yamato Basin during Ocean Drilling Program Legs 127/128. These can be considered as depleted (D-type) and enriched (E-type) basalts based on their incompatible trace element and Sr-Nd-Pb-Hf isotopic compositions. Both types of basalts plot along a common mixing array drawn between depleted mantle and slab sediment represented by a sand-rich turbidite on the Pacific Plate in the NE Japan fore arc. The depleted nature of the D-type basalts suggests that the slab sediment component is nil to minor relative to the dominant mantle component, whereas the enrichment of all incompatible elements in the E-type basalts was likely caused by a large contribution of bulk slab sediment in the source. The results of forward model calculations using adiabatic melting of a hydrous mantle with sediment flux indicate that the melting conditions of the source mantle for the D-type basalts are deeper and hotter than those for the E-type basalts, which appear to have formed under conditions hotter than those of normal mid-oceanic ridge basalts (MORB). These results suggest that the thicker oceanic crust was formed by greater degrees of melting of a hydrous metasomatized mantle source at unusually high mantle potential temperature during the opening of the Japan Sea.

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Section: Geochemical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemical variations in Japan Sea back‐arc basin basalts formed by high‐temperature adiabatic melting of mantle metasomatized by sediment subduction components

Hirahara

Kimura

Senda

et al. 2015

Geochem Geophys Geosyst

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“…Additionally, Fujii (2007) proposed that the role of plagioclase fractionation increases in shallower magma chambers (5-0.5 kbar; e.g., Almeev et al, 2013), leading to the generation of the characteristic magmas of the northern Izu-Bonin arc. However, no high Sr/Y ratios, which would indicate the contributions of garnet and/or amphibole, have been reported from the lavas of the northern Izu-Bonin arc (e.g., Tamura et al, 2010;Kimura and Ariskin., 2014), suggesting that the fractionation of the Pre-Komitake magmas is particular. According to Rapp and Watson (1995), Müntener et al (2001), Müntener and Ulmer (2006) and Alonso-Perez et al (2009), garnet is stable at >12 kbar in basalt to basaltic andesite melt, and at 8 kbar in andesite melt.…”

Section: Discussionmentioning

confidence: 99%

Geochemical and Sr–Nd isotopic characteristics of Quaternary Magmas from the Pre–Komitake volcano

Shibata

Yoshimoto

Fujii

et al. 2015

Journal of Mineralogical and Petrological Sciences

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The trace element and Sr-Nd isotopic compositions of Quaternary magmas from the Pre-Komitake volcano were investigated. The Sr and Nd isotope ratios ranged from 0.703320-0.703476, and 0.512885-0.513087, respectively, which are very similar to those of the lavas from Fuji and Komitake volcanoes that erupted subsequently. Enrichment of large ion lithophile elements, Pb and Sr, can be seen in the primitive mantle-normalized multi-element diagram of the Pre-Komitake, Komitake, and Fuji lavas. These collectively show island arc lava signatures; however, the middle to heavy rare earth elements are more depleted in the Pre-Komitake lavas, compared to those from Fuji. Positive Eu anomalies are observed, although the extents of these anomalies decrease with increasing SiO 2 in the Pre-Komitake lavas, whereas this is not observed in Fuji lavas. The Sr/Y ratios of Pre-Komitake lavas increase from basalt to basaltic andesite, but decreases through andesite to dacite. This occurs in combination with a rapid increase in La/Yb ratios, followed by a more gradual increase. A gradual decrease in Dy/Yb ratios is also seen over the entire compositional range. These data suggest deep (>12 kbar) fractionation of garnet and amphibole followed by shallow (i.e.,~5 kbar) fractionation of amphibole and plagioclase. Such variations are not observed in the Komitake and Fuji lavas, for which deep fractionation of clinopyroxene and shallow fractionation of plagioclase have been suggested. All three lavas, including those from the Pre-Komitake volcano, show similar isotopic, major, and trace element compositions in the unfractionated basalts. The differing geochemical trends found in the Pre-Komitake lavas are likely to be due to different mineral fractionations occurring in the hydrous Pre-Komitake basalts compared to the dry Fuji and Komitake basalts.

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“…Discrepancies in Figures 4b–4d are attributed to metamorphism. The primary magma compositions are calculated using PRIMACALC2 [ Kimura and Ariskin , ]. The data sources and calculation results are in Supporting Information Data Sets S1 and S2 and are shown in Figure S1.…”

Section: Mantle Potential Temperature and Compositionmentioning

confidence: 99%

“…Another estimate of source mantle fertility in terms of the MgO content in peridotite is independently available from the PRIMACALC2 results used for the calculations of the primitive MORB‐like magma compositions [ Kimura and Ariskin , ]. The results are generally consistent with those from OBS2 (blue dots in Figure g; Supporting Information Data Set S1).…”

Section: Mantle Potential Temperature and Compositionmentioning

confidence: 99%

Origin of geochemical mantle components: Role of spreading ridges and thermal evolution of mantle

Kimura

Gill

Keken

et al. 2017

Geochem Geophys Geosyst

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We explore the element redistribution at mid-ocean ridges (MOR) using a numerical model to evaluate the role of decompression melting of the mantle in Earth's geochemical cycle, with focus on the formation of the depleted mantle component. Our model uses a trace element mass balance based on an internally consistent thermodynamic-petrologic computation to explain the composition of MOR basalt (MORB) and residual peridotite. Model results for MORB-like basalts from 3.5 to 0 Ga indicate a high mantle potential temperature (T p ) of 1650-15008C during 3.5-1.5 Ga before decreasing gradually to 13008C today. The source mantle composition changed from primitive (PM) to depleted as T p decreased, but this source mantle is variable with an early depleted reservoir (EDR) mantle periodically present. We examine a twostage Sr-Nd-Hf-Pb isotopic evolution of mantle residues from melting of PM or EDR at MORs. At high-T p (3.5-1.5 Ga), the MOR process formed extremely depleted DMM. This coincided with formation of the majority of the continental crust, the subcontinental lithospheric mantle, and the enriched mantle components formed at subduction zones and now found in OIB. During cooler mantle conditions (1.5-0 Ga), the MOR process formed most of the modern ocean basin DMM. Changes in the mode of mantle convection from vigorous deep mantle recharge before 1.5 Ga to less vigorous afterward is suggested to explain the thermochemical mantle evolution.

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Calculation of water-bearing primary basalt and estimation of source mantle conditions beneath arcs: PRIMACALC2 model for WINDOWS

Cited by 66 publications

References 70 publications

Geochemical variations in Japan Sea back‐arc basin basalts formed by high‐temperature adiabatic melting of mantle metasomatized by sediment subduction components

Geochemical variations in Japan Sea back‐arc basin basalts formed by high‐temperature adiabatic melting of mantle metasomatized by sediment subduction components

Geochemical and Sr–Nd isotopic characteristics of Quaternary Magmas from the Pre–Komitake volcano

Origin of geochemical mantle components: Role of spreading ridges and thermal evolution of mantle

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