Product catalogue
Crustal reactions resulting from the mid-Pliocene to Recent continent-island arc collision in the Timor region
The Sunda and Banda Arcs are contiguous surface features associated with the convergent boundary between the Southeast Asian and Australian-Indian Ocean plates, and where these two arcs meet, the tectonic environment changes from oceanic subduction to continent-island arc collision. This area has been investigated in an attempt to recognise and understand some of the effects of the introduction of continental crust into a subduction zone. Depositional environments encountered in Deep Sea Drilling Project (DSDP) hole 262 have been correlated with present environments to determine past horizontal distances between the leading edge of the subduction zone and the DSDP location on the Australian crustal margin. These data have been combined with the apparent plate motion at this margin to derive an estimate of the surface width of the subduction zone through time. The similarity between past width variations and present lateral variations has been used as the basis for proposing a collision model. Before the collision, the Indonesian subduction zone extended eastwards into the region that is now the southern Banda Arc. The continental edge of Australia first entered this subduction zone about 3 m.y. ago, in the mid-Pliocene. Initially, a wedge of deformed continental margin sediments began to develop at the leading edge of the subduction zone. The tectonic front that separated deformed from undeformed sediments and an associated bathymetric low migrated up the continental slope leaving in their wake a large wedge of deformed continental margin sediments, which produced a southerly bulge in the subduction zone. Ultimately, the deformation wedge began to absorb the near-surface stresses, and relative motion between the front and the southern plate slowed to near zero. Continuing relative plate motion carried the deformation front back towards the volcanic arc. Compression from this has been almost entirely taken up in the subduction zone, and has led to thickening and uplift of the deformation wedge and crust associated with the pre-collision outer-arc ridge. The proposed collision model explains many of the morphological, geological, and geophysical irregularities in the Timor region. On a broader regional scale, the evidence that the Southeast Asian plate at Timor is moving eastward at about 60 km / m.y. relative to the Eurasian plate, supports the interpretation that the India/China continental collision is pushing the Southeast Asian plate to the southeast.
Simple
Identification info
- Date (Publication)
- 1981-01-01T00:00:00
- Citation identifier
- Geoscience Australia Persistent Identifier/https://pid.geoscience.gov.au/dataset/ga/81078
- Cited responsible party
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Role Organisation / Individual Name Details Publisher Bureau of Mineral Resources, Geology and Geophysics
Canberra Author Johnston, C.R.
1 Author Bowin, C.O.
2
- Name
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BMR Journal of Australian Geology and Geophysics
- Issue identification
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6:3:223-243
- Point of contact
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Role Organisation / Individual Name Details Custodian Corp
Owner Commonwealth of Australia (Geoscience Australia)
Custodian Commonwealth of Australia (Geoscience Australia)
Voice
- Topic category
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- Geoscientific information
Extent
))
- Maintenance and update frequency
- Unknown
Resource format
- Title
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Product data repository: Various Formats
- Website
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Data Store directory containing the digital product files
Data Store directory containing one or more files, possibly in a variety of formats, accessible to Geoscience Australia staff only for internal purposes
- Keywords
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GA Publication
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Journal
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- Keywords
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INA
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TLS
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- Australian and New Zealand Standard Research Classification (ANZSRC)
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Earth Sciences
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- Keywords
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Published_External
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Resource constraints
- Title
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Creative Commons Attribution 4.0 International Licence
- Alternate title
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CC-BY
- Edition
-
4.0
- Access constraints
- License
- Use constraints
- License
Resource constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
- Language
- English
- Character encoding
- UTF8
Distribution Information
- Distributor contact
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Role Organisation / Individual Name Details Distributor Commonwealth of Australia (Geoscience Australia)
Voice
- OnLine resource
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Journal article (pdf)
Journal article (pdf)
- Distribution format
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pdf
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Resource lineage
- Statement
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Unknown
- Hierarchy level
- Non geographic dataset
- Other
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GA Publication
- Description
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Source data not available.
Metadata constraints
- Title
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Australian Government Security ClassificationSystem
- Edition date
- 2018-11-01T00:00:00
- Classification
- Unclassified
Metadata
- Metadata identifier
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urn:uuid/fae9173a-7013-71e4-e044-00144fdd4fa6
- Title
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GeoNetwork UUID
- Language
- English
- Character encoding
- UTF8
- Contact
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Role Organisation / Individual Name Details Point of contact Commonwealth of Australia (Geoscience Australia)
Voice
Type of resource
- Resource scope
- Document
- Name
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AGSO BMR Journal
Alternative metadata reference
- Title
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Geoscience Australia - short identifier for metadata record with
uuid
- Citation identifier
- eCatId/81078
- Date info (Revision)
- 2018-04-20T06:08:30
- Date info (Creation)
- 2014-06-03T00:00:00
Metadata standard
- Title
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AU/NZS ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-1:2014
Metadata standard
- Title
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ISO 19115-3
- Title
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Geoscience Australia Community Metadata Profile of ISO 19115-1:2014
- Edition
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Version 2.0, September 2018
- Citation identifier
- https://pid.geoscience.gov.au/dataset/ga/122551