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FIGURE 1. Regional tectonic setting of E-W-trending gneissic domes in southern Tibet. Abbreviations are as follows: K-Kangmar, M-Mabja, LK-Lagri-Kangri, ML-Malashan, ITSZIndus-Tsangpo Suture Zone, STDS-southern Tibetan Detchment System, MCT-Main Central Thrust fault, MBT-Main Boundary Thrust fault The north Himalayan gneissic domes consist of several metamorphic and plutonic culminations that extend ~650-700 km in east-west direction. These orthogneissic domes are mantled by high-grade metamorphic rocks (Lee et al. 2000, 2004; Burchfiel et al. 1992), and in turn, are mantled by low-grade metamorphic to unmetamorphosed rocks. Five zircon SHRIMP samples, collected from the E-W trending gneissic domes, present similar ages on the western part of domes at 37-28 Ma and none of these ages on the eastern part correspond to rim of single grain. The core of the single grain yielded similar age of ~530-480 Ma. Besides, CL photographys also reveal different features for those five samples.

SHRIMP zircon ages of orthogneiss from EW-trending gneissic domes in Southern Tibet: Their tectonic implications