The Mesozoic Nari Formation volcanic rocks in the Shiquanhe area are situated in the western part of the Lhasa block,within the southern segment of the Bangong-Nujiang suture zone,and occupy a pivotal position in the south-north contraction and uplift of the Bangong Lake-Nujiang suture zone.The chronology and geochemistry analy-sis of these volcanic rocks reveal their composition as acidic volcaniclastic rocks with lava flows,belonging to the high potassium calc-alkaline series.They exhibit typical characteristics of a volcanic arc environment and were formed under compressional tectonic conditions,potentially sourced from a mixture of crustal and mantle materials.The LA-ICP-MS zircon U-Pb dating indicates an age of 153±1.1 Ma for rhyolite tuff within the Nari Formation.Combined with previous research findings,it is evident that India's collision with Asia exhibits an early westward movement fol-lowed by later eastward motion.
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