Question

Sharp lateral Moho variations across the SE Tibetan margin and their implications for plateau growth

Answer 1

The Moho beneath the Tibetan Plateau is significantly deeper than that beneath the neighboring Yangtze Craton and Indochina block.

Sudden Moho fluctuations are also observed over the southeastern plateau boundary, much like those under the eastern plateau margin. Interpret the severe Moho fluctuations over the plateau boundary as having formed during the late Miocene Tibetan Plateau extrusion southeastward. The steep Moho slope was preserved, although subsequent gravity collapse brought crustal extension and mild topographic variation.

The surrounding geosciences are particularly interested in the tectonic uplift of the Tibetan Plateau. A common paradigm for interpreting the geodynamic mechanism on the Tibetan Plateau's edge is mid-lower crustal flow. Due to the varied strengths of ding blocks, the model predicts different surface and Moho topographies across the plateau boundary, i.e., abrupt boundaries on the eastern plateau boundary and mild fluctuations in the southeastern plateau boundary.

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