Abstract
Located in the western part of the India-Asia continental collision zone, the Tian Shan-Pamir range is the currently most active and largest intracontinental orogenic belt worldwide. The uplifting process of the Pamir Plateau and deep structures below the Tian Shan orogen has attracted a lot of attention. The behavior of He in the geothermal systems holds great potential for addressing questions about local deep crustal processes and the Plateau uplifting mechanism. However, there is still a lack of study on volatiles in the Tian Shan-Pamir region, especially, helium, which is a very powerful geochemistry tool to reflect deep structures and processes. Through constraining the fluxes of 3He, we recognized different transportation modes for deep volatiles between Tian Shan and Pamir. The mantle-derived He along the Tian Shan is connected to the main faults at the mountain foot of the North Tian Shan and the South Tian Shan, and the rapid ascent of fluid from the mantle is implied. The relatively high levels of 3He/4He on the Pamir Plateau are indicative of crustal magmatism that is younger than ∼11 Ma, indicating a contribution of mantle-derived melts to the crustal thickening and uplifting of the Pamir Plateau since the middle Miocene.
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