Depth extent of the Lau back-arc spreading center and its relation to subduction processes

Dapeng Zhao, Yingbiao Xu, Douglas A. Wiens, Le Roy Dorman, John Hildebrand, Spahr Webb

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

Seismic tomography and wave form inversion revealed that very slow velocity anomalies (5 to 7 percent) beneath the active Lau spreading center extend to 100-kilometer depth and are connected to moderately slow anomalies (2 to 4 percent) in the mantle wedge to 400-kilometer depth. These results indicate that geodynamic systems associated with back-arc spreading are related to deep processes, such as the convective circulation in the mantle wedge and deep dehydration reactions in the subducting slab. The slow regions associated with the Tonga arc and the Lau back arc are separated at shallow levels but merge at depths greater than 100 kilometers, suggesting that slab components of back-arc magmas occur through mixing at these depths.

Original languageEnglish
Pages (from-to)254-257
Number of pages4
JournalScience
Volume278
Issue number5336
DOIs
Publication statusPublished - 1997 Oct 10
Externally publishedYes

ASJC Scopus subject areas

  • General

Fingerprint

Dive into the research topics of 'Depth extent of the Lau back-arc spreading center and its relation to subduction processes'. Together they form a unique fingerprint.

Cite this