Structural Heterogeneities in Southeast Tibet: Implications for Regional Flow in the Lower Crust and Upper Mantle

Figure 8

Left plan showing contour of smoothed elevations of Tibetan Plateau and surrounding regions [26]. Dark gray and light gray areas indicate regions of cold, strong, continental materials, and intermediate strength, respectively. White areas represent weak crustal regions. Right map showing low velocity anomalies (in %) along the depth between the lower crust and uppermost mantle. Red color indicates the locations of the regional flow. Blue dashed lines show the deep, large sutures, and the main tectonic boundaries. Black arrows indicate the presumed directions of the regional flow outward from the center of the plateau. BNJF: the Bangong-Nujian suture. XSF: Xianshuihe suture. LMF: the Longmen-Shan suture. NJF: the Nujiang suture. ANF: the Anninghe suture. RRF: the red river suture.