Sunda-Banda arc transition: incipient continent-island arc collision (Northwest Australia).

Shulgin, Alexey, Kopp, Heidrun , Mueller, C., Lueschen, E., Planert, Lars, Engels, M., Flueh, Ernst R., Krabbenhöft, Anne and Djajadihardja, Y. (2009) Sunda-Banda arc transition: incipient continent-island arc collision (Northwest Australia). Open Access Geophysical Research Letters, 36 . L10304. DOI 10.1029/2009GL037533.

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The eastern Sunda arc represents one of the few regions globally where the early stages of continent-arc collision can be studied. We studied along the western limit of the collision zone at the Sunda-Banda arc transition, where the Australian margin collides with the Banda island arc, causing widespread back arc thrusting. We present integrated results of a refraction/wide-angle reflection tomography, gravity modeling, and multichannel reflection seismic imaging using data acquired in 2006 southeast of Sumba Island. The composite structural model reveals the previously unresolved deep geometry of the collision zone. Changes in crustal structure encompass the 10 - 12 km thick Australian basement in the south and the 22 - 24 kmthick Sumba ridge in the north, where backthrusting of the 130 km wide accretionary prism is documented. The structural diversity along this transect could be characteristic of young collisional systems at the transition from oceanic subduction to continent-arc collision. Citation: Shulgin, A., H. Kopp, C. Mueller, E. Lueschen, L. Planert, M. Engels, E. R. Flueh, A. Krabbenhoeft, and Y. Djajadihardja (2009), Sunda-Banda arc transition: Incipient continent-island arc collision (northwest Australia), Geophys. Res. Lett., 36, L10304, doi: 10.1029/2009GL037533.

Document Type: Article
Keywords: Sumba; tomography; subduction; Sunda-Banda arc
Research affiliation: OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Refereed: Yes
Open Access Journal?: No
Publisher: AGU (American Geophysical Union)
Projects: Future Ocean, SINDBAD
Date Deposited: 03 Jun 2009 09:24
Last Modified: 12 Oct 2017 11:53

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