Mantle temperature anomaly in southern Kermadec speculated by three-dimensional numerical subduction modeling

Yoon Mi Kim, Changyeol Lee

Research output: Contribution to journalArticle

Abstract

Along-strike geochemical variations of the Quaternary volcanic rocks in southern Kermadec are classified into two types, “arc-type” (e.g., Rumble V Ridge) and “rift-type” basalts (e.g., Ngatoro Rift), that indicate partial melting and no melting of the subducted sediment, respectively. A recent geochemical study attributed the arc-type basalts to the increased slab surface temperatures resulting from a hot finger-like temperature anomaly in the mantle wedge. To test the existence of the temperature anomaly, we conducted three-dimensional numerical subduction models varying the size of a hot temperature anomaly in the mantle wedge under the Rumble V Ridge. A temperature anomaly with a diameter of 60 km and magnitude of ~ 150 °C increased the slab surface temperature by up to 60 °C and resulted in the localized partial melting of the subducted sediment under the Rumble V Ridge, which is reflected in the arc-type basalts. In addition, the temperature anomaly in the mantle wedge explains the spacing (~ 80 km) between the Rumble V Ridge and Ngatoro Rift. Thus, hot finger-like temperature anomalies in the mantle wedge plausibly explain both the along-strike geochemical variations of the Quaternary volcanic rocks and the spacing between the Rumble V Ridge and Ngatoro Rift in southern Kermadec. High-resolution seismic tomography of the mantle wedge and back-arc mantle could confirm the existence of the temperature anomalies.

Original languageEnglish
Pages (from-to)351-358
Number of pages8
JournalGeo-Marine Letters
Volume38
Issue number4
DOIs
Publication statusPublished - 2018 Aug 1

Fingerprint

temperature anomaly
subduction
mantle
modeling
Basalt
Volcanic rocks
basalt
Temperature
Melting
partial melting
slab
volcanic rock
spacing
surface temperature
Sediments
seismic tomography
sediment
Tomography
melting
Numerical models

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Environmental Science (miscellaneous)
  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

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abstract = "Along-strike geochemical variations of the Quaternary volcanic rocks in southern Kermadec are classified into two types, “arc-type” (e.g., Rumble V Ridge) and “rift-type” basalts (e.g., Ngatoro Rift), that indicate partial melting and no melting of the subducted sediment, respectively. A recent geochemical study attributed the arc-type basalts to the increased slab surface temperatures resulting from a hot finger-like temperature anomaly in the mantle wedge. To test the existence of the temperature anomaly, we conducted three-dimensional numerical subduction models varying the size of a hot temperature anomaly in the mantle wedge under the Rumble V Ridge. A temperature anomaly with a diameter of 60 km and magnitude of ~ 150 °C increased the slab surface temperature by up to 60 °C and resulted in the localized partial melting of the subducted sediment under the Rumble V Ridge, which is reflected in the arc-type basalts. In addition, the temperature anomaly in the mantle wedge explains the spacing (~ 80 km) between the Rumble V Ridge and Ngatoro Rift. Thus, hot finger-like temperature anomalies in the mantle wedge plausibly explain both the along-strike geochemical variations of the Quaternary volcanic rocks and the spacing between the Rumble V Ridge and Ngatoro Rift in southern Kermadec. High-resolution seismic tomography of the mantle wedge and back-arc mantle could confirm the existence of the temperature anomalies.",
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Mantle temperature anomaly in southern Kermadec speculated by three-dimensional numerical subduction modeling. / Kim, Yoon Mi; Lee, Changyeol.

In: Geo-Marine Letters, Vol. 38, No. 4, 01.08.2018, p. 351-358.

Research output: Contribution to journalArticle

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