Clustering of arc volcanoes caused by temperature perturbations in the back-arc mantle

Changyeol Lee, Ikuko Wada

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Clustering of arc volcanoes in subduction zones indicates along-arc variation in the physical condition of the underlying mantle where majority of arc magmas are generated. The sub-arc mantle is brought in from the back-arc largely by slab-driven mantle wedge flow. Dynamic processes in the back-arc, such as small-scale mantle convection, are likely to cause lateral variations in the back-arc mantle temperature. Here we use a simple three-dimensional numerical model to quantify the effects of back-arc temperature perturbations on the mantle wedge flow pattern and sub-arc mantle temperature. Our model calculations show that relatively small temperature perturbations in the back-arc result in vigorous inflow of hotter mantle and subdued inflow of colder mantle beneath the arc due to the temperature dependence of the mantle viscosity. This causes a three-dimensional mantle flow pattern that amplifies the along-arc variations in the sub-arc mantle temperature, providing a simple mechanism for volcano clustering.

Original languageEnglish
Article number15753
JournalNature communications
Volume8
DOIs
Publication statusPublished - 2017 Jun 29

Fingerprint

Volcanoes
volcanoes
Cluster Analysis
Earth mantle
arcs
perturbation
Temperature
Flow patterns
temperature
wedge flow
Convection
Viscosity
Numerical models
flow distribution
causes
slabs
convection

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

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title = "Clustering of arc volcanoes caused by temperature perturbations in the back-arc mantle",
abstract = "Clustering of arc volcanoes in subduction zones indicates along-arc variation in the physical condition of the underlying mantle where majority of arc magmas are generated. The sub-arc mantle is brought in from the back-arc largely by slab-driven mantle wedge flow. Dynamic processes in the back-arc, such as small-scale mantle convection, are likely to cause lateral variations in the back-arc mantle temperature. Here we use a simple three-dimensional numerical model to quantify the effects of back-arc temperature perturbations on the mantle wedge flow pattern and sub-arc mantle temperature. Our model calculations show that relatively small temperature perturbations in the back-arc result in vigorous inflow of hotter mantle and subdued inflow of colder mantle beneath the arc due to the temperature dependence of the mantle viscosity. This causes a three-dimensional mantle flow pattern that amplifies the along-arc variations in the sub-arc mantle temperature, providing a simple mechanism for volcano clustering.",
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Clustering of arc volcanoes caused by temperature perturbations in the back-arc mantle. / Lee, Changyeol; Wada, Ikuko.

In: Nature communications, Vol. 8, 15753, 29.06.2017.

Research output: Contribution to journalArticle

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