Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa

Rapp, Robert P.; Shimizu, Nobumichi; Norman, Marc D.; Applegate, G.S

doi:10.1016/s0009-2541(99)00106-0

Cited by 1,589 publications

(816 citation statements)

References 39 publications

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“…5-7). There are different models accounting for the petrogenesis of such highMg andesite-adakitic rock suites, including assimilation fractional crystallization (AFC) or fractional crystallization (FC) from parental basaltic magmas (Castillo et al, 1999;Macpherson et al, 2006), magma mixing between felsic and basaltic magmas (e.g., Streck et al, 2007), and interaction between melts and mantle (e.g., Gao et al, 2004; (Rapp et al, 1999(Rapp et al, , 2003, and references therein). The fields for delaminated lower crust, subducted oceanic crust, and thickened lower crust-derived adakitic rocks are after Wang et al (2006a, b).…”

Section: Petrogenesismentioning

confidence: 99%

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Wang

Chung

et al. 2011

Lithos

102

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Section: Petrogenesismentioning

confidence: 99%

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Wang

Chung

et al. 2011

Lithos

102

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“…This is consistent with the fact that MORB is the protolith of adakites. The high MgO content of adakite relative to the experimentally produced equivalent has been interpreted as a consequence of interaction of adakite melt with mantle wedge during magma ascent (e.g., Rapp et al, 1999;Xu et al, 2000Xu et al, , 2002. In comparison, the Na 2 O, CaO and MgO contents of the Zhantang andesites do not fall in the R 2-4 SW field (Fig.…”

Section: Compositional Comparison Of the Zhantang Andesites And Expermentioning

confidence: 89%

“…Sun and McDonough (1989). Rapp et al (1999) Drummond et al (1996) ponents in the andesites than in the basalts (Table 1). Second, although the low Mg, Cr, Co, and Ni contents of the andesites may be explained by removal of olivine and pyroxene from parental magmas, their low Y and HREE contents require fractionation of amphibole that is enriched these elements.…”

Section: Major and Trace Element Compositions Of The Basaltsmentioning

confidence: 97%

“…amphibole ± plagioclase as residual phases are generally present in melting experiments at pressures of ≥10 kbar and temperatures of 850-1150°C (Rapp et al, 1991;Winther and Newton, 1991;Sen and Dunn, 1994;Wolf and Wyllie, 1994;Rapp, 1995;Rapp and Watson, 1995;Winther, 1996). Rapp et al (1999) pointed out that adakitic liquids are produced by melting of hydrated basalt at 10-40 kbar. Wyllie and Wolf (1993) suggested that garnet-in reactions occur at pressures slightly less than 10 kbar, depending on the bulk composition of basalt.…”

Section: Compositional Comparison Of the Zhantang Andesites And Expermentioning

confidence: 99%

“…The first group (13 samples, named as R 1 , compositional range in Fig. 9, average composition in Table 2) corresponds to the data of Rapp et al (1991Rapp et al ( , 1999, Rapp (1995), Rapp and Watson (1995) at 12-38 kbar. Its starting material is an alkali-rich basalt (Table 4), having relatively high total alkalis (Na 2 O + K 2 O) and Na/Ca and low cafemic constituents (CaO, FeO, MgO, MnO, and TiO 2 ).…”

Section: Compositional Comparison Of the Zhantang Andesites And Expermentioning

confidence: 99%

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Extremely high-Na adakite-like magmas derived from alkali-rich basaltic underplate: The Late Cretaceous Zhantang andesites in the Huichang Basin, SE China.

Xiong

et al. 2003

Geochem. J.

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The Zhantang andesites, which erupted in the Late Cretaceous Huichang Basin of SE China interior, were associated with the Late Mesozoic lithospheric extension and basaltic underplating. They are highNa (6.59-8.46 wt% Na 2 O), high-Al trondhjemitic rocks with high Sr and Ba, low Y and HREE, and high Sr/Y and La/Yb ratios, similar to modern adakites. However, they are much higher in Na 2 O but lower in CaO than adakites. Their εNd(T) values of -2.3 to -3.8 and initial 87 Sr/ 86 Sr ratios of 0.707 to 0.708 are also significantly different from those of adakites with MORB-like isotopic compositions. These chemical and isotopic features, along with the tectonic setting, suggest that they were not produced by partial melting of subducting slab.The Zhantang adakite-like magmas may be derived from underplated basaltic lower crust, but require a compositionally peculiar basaltic protolith to account for their extremely high-Na and low-Ca feature. They are compositionally comparable to the experimentally produced partial melts of alkali-rich basalt. We therefore interpret them as the products of melting of an alkali-rich basaltic rock.

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Geochemical insights into the role of metasomatic hornblendite in generating alkali basalts

Dai

Zhao

Zheng

2014

Geochem. Geophys. Geosyst.

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Experimental petrology suggested the role of hornblendite in generating alkali basalt. This mechanism is confirmed by an integrated study of major-trace elements and radiogenic isotopes for Mesozoic alkali basalts from the Qinling orogen in China. The alkali basalts have high contents of MgO (4.8-11.1 wt %, Mg# 5 47-69), Na 2 O 1 K 2 O (2.9-5.4 wt %), TiO 2 (2.0-3.1 wt %) but low content of SiO 2 (41.4-49.6 wt %), which are generally silica-undersaturated with normative minerals of nepheline and olivine. They exhibit OIB-like trace element distribution patterns, with enrichment of LILE and LREE but no depletion of HFSE relative to the primitive mantle. They also show relatively depleted Sr-Nd-Hf isotope compositions, with low initial 87 Sr/ 86 Sr ratios of 0.7028-0.7058, positive e Nd (t) values of 4.0-9.8 and e Hf (t) values of 8.8-13.5 for whole-rock, and positive e Hf (t) values of 5.2-16.4 for zircon. Such element and isotope features indicate their origination from the juvenile subcontinental lithospheric mantle (SCLM) source with involvement of crustal components. The alkali basalts generally have high K 2 O/Na 2 O ratios, and high K 2 O and TiO 2 contents, suggesting their derivation from partial melting of hornblendite-rich mantle lithology. They also exhibit variable K/La and Ti/La ratios that are correlated with (La/Yb) N ratios, indicating a geochemical heterogeneity of the SCLM source. Taken together, all the above geochemical features can be accounted for by partial melting of a hornblendite-rich SCLM source. The hornblendite would be generated by reaction of the juvenile SCLM wedge peridotite with hydrous felsic melts derived from subducted Palaeotethyan oceanic crust at the slab-mantle interface in the subduction channel. Therefore, orogenic alkali basalts record recycling of the subducted fossil oceanic crust, and the metasomatic hornblendite is an important lithology in local SCLM domains above fossil subduction channels.

show abstract

Reaction between slab-derived melts and peridotite in the mantle wedge: experimental constraints at 3.8 GPa

Cited by 1,589 publications

References 39 publications

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Late Triassic high-Mg andesite/dacite suites from northern Hohxil, North Tibet: Geochronology, geochemical characteristics, petrogenetic processes and tectonic implications

Extremely high-Na adakite-like magmas derived from alkali-rich basaltic underplate: The Late Cretaceous Zhantang andesites in the Huichang Basin, SE China.

Geochemical insights into the role of metasomatic hornblendite in generating alkali basalts

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