Slab dehydration and potassium-lithium recycling in the forearc indicated by potassium and lithium isotope compositions of exhumed metabasites

Liu, Haiyang; Yang, Tinggen; Xue, Ying-Yu; Deng, Jianghong; Xiao, Yilin; Sun, He; Tong, Fengtai; Wang, Kun; Gao, Yongjun; Lin, Kuan-Yu; Zhang, Fangyi; Jin, Xin; Sun, Wei-Dong

doi:10.1016/j.gca.2023.09.006

Cited by 6 publications

(1 citation statement)

References 109 publications

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“…1), many of which have HIMU characteristics and are subducting with the Pacific Plate 76,80,81 . In addition, the HIMU-type seamount subduction signal has also been recognized in the central Mariana forearc metabasalts (16-18°N) 8,82 . Pb isotopic compositions of NSP-21 and NSP-24 medium-K melt inclusions are close to those of the FOZO end-member (Fig.…”

Section: Implications For Subducted Himu Component Recycling In the M...mentioning

confidence: 95%

A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions

Li,

Ishizuka,

Stern

et al. 2024

Nat Commun

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Compositions of island arc and back-arc basin basalts are often used to trace the recycling of subducted materials. However, the contribution of subducted components to the mantle source during initial arc rifting before back-arc basin spreading is not yet well constrained. The northernmost Mariana arc is ideal for studying this because the transition from rifting to back-arc spreading is happening here. Here we report major and trace element and Pb isotopic compositions of olivine-hosted melt inclusions from lavas erupted during initial rifting at 24°N (NSP-24) and compare them with those in active arc front at 21°N and mature back-arc basin at 18°N. NSP-24 high-K melt inclusions have highly radiogenic Pb compositions and are close to those of the HIMU end-member, suggesting the presence of this component in the magma source. The HIMU-like component may be stored in the over-riding plate and released into arc magma with rifting. HIMU-type seamounts may be subducted elsewhere beneath the Mariana arc, but obvious HIMU-type components appear only in the initial stages of arc rifting due to the low melting degree and being consumed during the process of back-arc spreading.

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Section: Implications For Subducted Himu Component Recycling In the M...mentioning

confidence: 95%

A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions

Li,

Ishizuka,

Stern

et al. 2024

Nat Commun

View full text Add to dashboard Cite

show abstract

High-temperature inter-mineral potassium isotope fractionation in ultrapotassic and granitic rocks: Implications for the potassium isotopic compositions of arc magmas

Yang,

Liu,

et al. 2023

Chemical Geology

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Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling

Liu,

Xue,

Sun

et al. 2024

Chemical Geology

View full text Add to dashboard Cite

Slab dehydration and potassium-lithium recycling in the forearc indicated by potassium and lithium isotope compositions of exhumed metabasites

Cited by 6 publications

References 109 publications

A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions

A HIMU-like component in Mariana Convergent Margin magma sources during initial arc rifting revealed by melt inclusions

High-temperature inter-mineral potassium isotope fractionation in ultrapotassic and granitic rocks: Implications for the potassium isotopic compositions of arc magmas

Lithium isotopic composition of low-temperature altered oceanic crust and its implications for Li cycling

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