Evolution and Dynamic Interpretation of Deep Structure in Zanda County,Xizang Autonomous Region
Authors:   China Geological Survey Military-Civilian Integration Geological Survey Center,Laboratory for Big Data and Decision, CHEN Jia qi , Guo You ,   China Geological Survey Military-Civilian Integration Geological Survey Center, DAN Zeng ,   China Geological Survey Military-Civilian Integration Geological Survey Center, MIN Xin ,   China Geological Survey Military-Civilian Integration Geological Survey Center, YUAN Liang ,   China Geological Survey Military-Civilian Integration Geological Survey Center, LUO Jiang bo ,   China Geological Survey Military-Civilian Integration Geological Survey Center, ZHANG Hui-shan ,   China Geological Survey Military-Civilian Integration Geological Survey Center
Published: November 2024

As the research in Earth Sciences continues to deepen, the tectonic environment and its evolutionary characteristics of the Zanda region in Tibet have become a hot topic for geologists. This study, based on the precise mapping of the deep structure of the Zanda Basin and the surface geological features, explores the tectonic setting and geological evolution processes of the Zanda area based on interdisciplinary crossreference. By collecting rock samples from the lithosphere profile and records of tectonic deformation, and integrating geochemical analysis and chronology, the study has analyzed the formation ages of the main geological units in the region and their tectonic activity history. It reveals the tectonic deformation features of the Zanda area under the influence of the northward movement of the Indian Plate and the collision with the Asian Plate and accurately reconstructs the area's geological evolution process since the Eocene. Geophysical survey results indicate a significant low-velocity anomaly in the deep part of the Zanda Basin, speculated to be related to the intrusion of molten materials in the deep basin and the flow of crustal materials. The study also finds that the sedimentary sequences in the Zanda area are intimately linked to regional tectonic activities, reflecting land uplift, erosion, and sedimentation processes at different evolutionary stages. The establishment of a tectonic reconstruction model not only provides new insights into understanding the structural evolution of the southwestern edge of the Qinghai-Xizang Plateau but also has significant implications for predicting the distribution and development of potential mineral resources in the region. Through structural analysis under the context of regional geology, it is recognized that the Zanda area in Xizang exhibits the complex characteristics of multiple phases of tectonic activity overlaid, providing a new perspective for further exploring the dynamics processes within the plateau and the deep Earth material cycle. The research has collected over 500 rock samples and conducted more than 100 geological profile measurements, using precise isotopic geochronology methods to comprehensively analyze the collected samples, establishing a series of key geological time markers, and accurately delineating the tectonic evolutionary landscape of the Zanda area on a spatiotemporal scale. The research results not only enrich the understanding of the geological history of this region but also provide valuable data for studies on the inner Earth material and energy exchange mechanisms.