Geoscience Reference
In-Depth Information
Figure 10.18.
Sections across southern Tibet (along the Yadong-Gulu rift at 89-91
◦
E). (a) Migrated reflection
profiles (individual sections labelled TIB1-TIB11). Horizontal distances are centred on the Yarlung-Zangbo suture.
MHT, main Himalayan thrust; Moho, the top of the subducting Indian mantle; a series of sub-horizontal reflections
at
9s two-way time in the blank region to the north of the Zangbo suture are thought to be from an ophiolite
nappe accretionary wedge; YDR (Yamdrok-Damxung) a series of sub-horizontal reflections extending to the
northern end of the reflection profiles and including several high-amplitude, negative-polarity 'bright spots'
indicative of solid-fluid contacts (Section 4.4.3). (b) A composite of seismic information: S-wave velocity models
derived from waveform modelling of broad-band data (solid line with error bars); stipple, wide-angle reflection
beneath and north of the Zangbo suture; background,
∼
