Controls on melt focusing beneath old subduction zones: A case study of northeast Japan

Yoo, Soohwan; Lee, Changyeol

doi:10.1016/j.tecto.2023.229766

Cited by 3 publications

(2 citation statements)

References 52 publications

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“…They showed they could to a reasonable degree match observations of the location of the volcanic arc, seismic tomography, and heat flow if the initial water content of the incoming slab was 2-3 wt% and the viscosity of the modeled serpentinite layer was in the range of 10 20 -10 21 Pa•s. Yoo and Lee (2023) provided a similar study of fluid production and release along with melt generation and freezing.…”

Section: Tohoku and Hokkaidomentioning

confidence: 99%

An introductory review of the thermal structure of subduction zones: I. Motivation and selected examples

Keken¹,

Wilson

2023

Preprint

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The thermal structure of subduction zones is fundamental to our understanding of physical and chemical processes that occur at active convergent plate margins. These include magma generation and related arc volcanism, shallow and deep seismicity, and metamorphic reactions that can release fluids. Computational models can predict the thermal structure to great numerical precision when models are fully described but this does not guarantee accuracy or applicability. In a pair of companion papers the construction of thermal subduction zone models, their use in subduction zone studies, and their link to geophysical and geochemical observations is explored. In part I the motivation to understand the thermal structure is presented based on experimental and observational studies. This is followed by a description of a selection of thermal models for the Japanese subduction zones.

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Section: Tohoku and Hokkaidomentioning

confidence: 99%

An introductory review of the thermal structure of subduction zones: I. Motivation and selected examples

Keken¹,

Wilson

2023

Preprint

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show abstract

“…However, there is no an agreement regarding the relationships between magmatism and the roles of subducted slabs and the corresponding subduction styles (Morris et al, 2000;Faccenna et al, 2010). Instead, a contradictory and multifaceted dynamic process emerges due to the complex magmatic composition (Yoo and Lee, 2023). In the eastern region of the South China Block (SCB), tectonic magmatism spanned a considerable time span during the Mesozoic (Zhou et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Driven magmatism and crustal thinning of coastal South China in response to subduction

Su,

Zhu,

2024

Preprint

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Abstract. The late Mesozoic igneous rocks along the coastal South China Block (SCB) exhibit complex parental sources involving a depleted mantle, subducted sediment-derived melt, and melted crust. This period aligns with the magmatic flareup and lull in the SCB, debating with the compression or extension in coastal region. Our study employs numerical models to investigate the dynamics of the ascent of underplating magma along the Changle-Nan’ao Belt (CNB), simulating its intrusion and cooling processes while disregarding the formational background. The rheological structure of the lithospheric mantle significantly influences magma pathways, dictating the distribution of magmatism. This work reveals that the ascent of magma in the presence of faults is considerably faster than that in the absence of faults, and contemporaneous magmatic melts could produce different cooling and diagenetic processes. Additionally, the influence of pre-existing magma accelerates underplating magma emplacement. The ascending of magma forms a mush-like head, contributing to magmatic circulation beneath the crust and decreasing crustal thickness. Multiphase magmatism increases the geothermal gradient, reducing the lithospheric viscosity and promoting underplating magma ascent, leading to magmatic flare-ups and lulls. Our findings suggest that the Cretaceous magmatism at different times in the coastal SCB may be associated with the effects of lithospheric faults under similar subduction conditions. Boundary compression forces delay magma ascent, while rising magma induces a significant circulation, decreasing the crustal thickness of the coastal SCB. This study provides new insights into the complex interplay of magmatic processes during subduction, emphasizing the role of lithospheric structure in shaping the temporal and spatial evolution of coastal magmatism.

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An introductory review of the thermal structure of subduction zones: I—motivation and selected examples

Keken

Wilson

2023

Prog Earth Planet Sci

View full text Add to dashboard Cite

The thermal structure of subduction zones is fundamental to our understanding of physical and chemical processes that occur at active convergent plate margins. These include magma generation and related arc volcanism, shallow and deep seismicity, and metamorphic reactions that can release fluids. Computational models can predict the thermal structure to great numerical precision when models are fully described but this does not guarantee accuracy or applicability. In a trio of companion papers, the construction of thermal subduction zone models, their use in subduction zone studies, and their link to geophysical and geochemical observations are explored. In part I, the motivation to understand the thermal structure is presented based on experimental and observational studies. This is followed by a description of a selection of thermal models for the Japanese subduction zones.

show abstract

Controls on melt focusing beneath old subduction zones: A case study of northeast Japan

Cited by 3 publications

References 52 publications

An introductory review of the thermal structure of subduction zones: I. Motivation and selected examples

An introductory review of the thermal structure of subduction zones: I. Motivation and selected examples

Driven magmatism and crustal thinning of coastal South China in response to subduction

An introductory review of the thermal structure of subduction zones: I—motivation and selected examples

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