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Flattening the Bhutan Himalaya
Earth and Planetary Science Letters
  • Stacey L. Corrie, Boise State University
  • Matthew J. Kohn, Boise State University
  • Nadine McQuarrie, University of Pittsburgh
  • Sean P. Long, University of Nevada
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A detailed thermobarometric transect of 35 samples across the Greater and Tethyan Himalayan sequences in central Bhutan demonstrates a tectonostratigraphically-intact section with uniform apparent thermal and baric field gradients of 20±2 °C/km and 0.57±0.08 kbar/km. Pressure–temperature paths determined from chemically-zoned garnets in 6 samples demonstrate that these P–T conditions correspond with maximum pressures. The super-lithostatic baric gradient cannot be explained by pre- to syn-metamorphic tectonic processes, or by extension within an inclined slab. Instead the data imply 50% post-peak-metamorphic flattening of the Himalayan metamorphic core, accommodated by distributed, top-to-the-north shear, consistent with microstructural analysis. Orogenic flattening best explains the development of the South Tibetan Detachment System as a strain incompatibility feature rather than a structure bounding the top of a tectonically-inserted wedge, and helps reconcile debate attributing first-order Himalayan structural features to either wedge failure ("critical taper") or pipe-flow ("channel flow").
Citation Information
Stacey L. Corrie, Matthew J. Kohn, Nadine McQuarrie and Sean P. Long. "Flattening the Bhutan Himalaya" Earth and Planetary Science Letters (2012)
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