Mantle flow in regions of complex tectonics

Insights from Indonesia

J. F. Di Leo, J. Wookey, J. O.S. Hammond, J. M. Kendall, Satoshi Kaneshima, H. Inoue, T. Yamashina, P. Harjadi

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Indonesia is arguably one of the tectonically most complex regions on Earth today due to its location at the junction of several major tectonic plates and its long history of collision and accretion. It is thus an ideal location to study the interaction between subducting plates and mantle convection. Seismic anisotropy can serve as a diagnostic tool for identifying various subsurface deformational processes, such as mantle flow, for example. Here, we present novel shear wave splitting results across the Indonesian region. Using three different shear phases (local S, SKS, and downgoing S) to improve spatial resolution of anisotropic fabrics allows us to distinguish several deformational features. For example, the block rotation history of Borneo is reflected in coast-parallel fast directions, which we attribute to fossil anisotropy. Furthermore, we are able to unravel the mantle flow pattern in the Sulawesi and Banda region: We detect toroidal flow around the Celebes Sea slab, oblique corner flow in the Banda wedge, and sub-slab mantle flow around the arcuate Banda slab. We present evidence for deep, sub-520 km anisotropy at the Java subduction zone. In the Sumatran backarc, we measure trench-perpendicular fast orientations, which we assume to be due to mantle flow beneath the overriding Eurasian plate. These observations will allow to test ideas of, for example, slab-mantle coupling in subduction regions.

Original languageEnglish
Article numberQ12008
JournalGeochemistry, Geophysics, Geosystems
Volume13
Issue number12
DOIs
Publication statusPublished - Dec 1 2012

Fingerprint

Indonesia
Tectonics
tectonics
Earth mantle
Anisotropy
mantle
slab
slabs
Shear waves
anisotropy
Flow patterns
Coastal zones
tectonic plate
block rotation
Earth (planet)
corner flow
histories
seismic anisotropy
wave splitting
mantle convection

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Di Leo, J. F., Wookey, J., Hammond, J. O. S., Kendall, J. M., Kaneshima, S., Inoue, H., ... Harjadi, P. (2012). Mantle flow in regions of complex tectonics: Insights from Indonesia. Geochemistry, Geophysics, Geosystems, 13(12), [Q12008]. https://doi.org/10.1029/2012GC004417

Mantle flow in regions of complex tectonics : Insights from Indonesia. / Di Leo, J. F.; Wookey, J.; Hammond, J. O.S.; Kendall, J. M.; Kaneshima, Satoshi; Inoue, H.; Yamashina, T.; Harjadi, P.

In: Geochemistry, Geophysics, Geosystems, Vol. 13, No. 12, Q12008, 01.12.2012.

Research output: Contribution to journalArticle

Di Leo, JF, Wookey, J, Hammond, JOS, Kendall, JM, Kaneshima, S, Inoue, H, Yamashina, T & Harjadi, P 2012, 'Mantle flow in regions of complex tectonics: Insights from Indonesia', Geochemistry, Geophysics, Geosystems, vol. 13, no. 12, Q12008. https://doi.org/10.1029/2012GC004417
Di Leo, J. F. ; Wookey, J. ; Hammond, J. O.S. ; Kendall, J. M. ; Kaneshima, Satoshi ; Inoue, H. ; Yamashina, T. ; Harjadi, P. / Mantle flow in regions of complex tectonics : Insights from Indonesia. In: Geochemistry, Geophysics, Geosystems. 2012 ; Vol. 13, No. 12.
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