paul kapp (university of arizona) an yin & craig manning ...tarim basin 400 km 200 india...
TRANSCRIPT
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The Qiangtang metamorphic belt in central Tibet: Evidence for large-magnitude translation and underplating of melange
beneath continental crust during flat-slab subductionPaul Kapp (University of Arizona)
An Yin & Craig Manning (UCLA), George Gehrels (UA)
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To what extent can melange underthrust and be incorporated into continental crust?
The limited exposures of subduction-related rocks that demonstrably underplated continental crust may suggest that most subducted material
is recycled to mantle or that underplated rocks are rarely exhumed.
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EAST(Shuang Hu)
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CENTRAL(Rongma)
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CENTRAL (Rongma)
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CENTRAL (Rongma)
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WEST (Gangma Co)
white specks are a herd of sheep
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Summary of Preliminary Results
1. Sedimentary Provenance: similarities between N. + S. Qiangtang Carboniferous strata + melange detrital zircon age spectra
2. Metamorphic evolution: Consistently high-P; large range of T
3. Extent of normal faulting: Extensional shear zone equilibrated at high-P
If correct, the process of large-scale underthrusting and incorporation of melangeinto continental crust during flat-slab subduction would be directly validated
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