Melting of crustal rocks as a possible origin for Middle Miocene to Quaternary rhyolites of northeast Hokkaido, Japan: Constraints from Sr and Nd isotopes and major- and trace-element chemistry

Takanashi, K.; Kakihara, Yasuyuki; Ishimoto, H.; Shuto, Kenji

doi:10.1016/j.jvolgeores.2011.11.008

Cited by 11 publications

(1 citation statement)

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“…For the Kurile arc, the data corresponding to two bins of MgO < 1 wt.% (0.165 and 0.74 wt.%) were excluded because these rhyolites are formed by partial melting of crustal rocks 35 . The data of these two bins signi cantly deviate from the main arc trend having much less radiogenic Nd isotope compositions (Supplementary Data S1…”

Section: Data Selection and Treatmentmentioning

confidence: 99%

Differentiation of arc magmas and crustal growth: a Nd isotope perspective

Chiaradia

2024

Preprint

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Arc magmas form new continental crust and are responsible for volcanic eruptions as well as for major metallic ore deposits. It is generally accepted that arc magmas are generated above subduction zones by partial melting of the mantle wedge and differentiate within the crust of the overriding plate through fractional crystallization, magma mixing and crustal assimilation. However, it is not clear in which proportions mantle and the above different intracrustal processes contribute to the broad geochemical variability of arc magmas. Here, using Nd isotope systematics and their geochemical modelling, I show that the thicker the crust of the overriding plate, the higher the assimilation rate of crustal rocks by mantle-derived magmas and the older the assimilated rocks. This highlights a systematic increase of crustal contribution to arc magma chemical and isotopic composition with the thickening of the overriding plate crust. The data presented are also consistent with growth and maturation of the continental crust through time by continuously increasing thickness, SiO2 content and Nd isotopically evolved composition.

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Section: Data Selection and Treatmentmentioning

confidence: 99%