the papuan orogen: a misplaced mesozoic belt of the tasman
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The Papuan Orogen: A Misplaced Mesozoic Belt of the Tasman Orogenic Zone
Authors: Robert Holm, Dulcie Saroa, Lloyd White and Kelly Heilbronn
PAPUA NEW GUINEA
GEOSCIENCE NETWORKMineralResourcesAuthor i t y
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Long-lived, overall convergent margin from the Cambrian
through to the Triassic, succeeded by Cretaceous break-up.
What happened during the late Triassic to Lower Cretaceous
in eastern Australia? Where are the rocks?
Permian to Cretaceous rocks have been found submerged to
the east of Australia – is this it?
The Tasman Orogenic Zone
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How about Papua New Guinea?
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Port Moresby
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What does this have to do with the Tasman Orogenic Zone?
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Zircon morphology indicates zircons are detrital and Cretaceous (ca. 100 Ma) depositional age matches the basement Owen Stanley Metamorphics.
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Carboniferous-Permian sources are prevalent in
contemporaneous basins but are under-represented
in regional Jurassic and Cretaceous detritus.
Carboniferous-Early Triassic sources are not being
recycled on a regional-scale, are they concealed
beneath cover?
Older basement sources still contribute to detritus
and can be used to trace provenance signatures.
Consider the Regional Jurassic and Cretaceous Basins
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Current Reconstructions?
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Alternate Provenance
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Provence-Based Reconstruction
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The New Guinea Mobile Belt?
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The New Guinea Mobile Belt?
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The Bird’s Head – West Papua?
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Webb et al., 2019
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The Bird’s Head – West Papua?
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Mesozoic Rocks of New Guinea
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Evidence for a long-lived convergent margin east of
Australia throughout the late Mesozoic.
A new late Mesozoic orogen is required within the Tasman
Orogenic Zone – the Papuan Orogen…
Conclusions and Implications
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