额尔齐斯构造带多区段变形对比研究：对新疆北部地体拼贴过程的制约

地体多向汇聚拼贴是中亚造山带的重要增生机制。然而，目前对中亚造山带中不同类型地体的拼贴时限及动力学过程尚存争议，制约了我们对中亚造山带增生过程的准确理解。额尔齐斯构造带是中亚造山带中一条重要缝合边界，记录着阿尔泰造山带与东西准噶尔地体碰撞拼贴的丰富信息，是认知中亚造山带地体多向汇聚拼贴过程的关键地带。目前的研究，缺少对额尔齐斯构造带不同区段变形构造的对比分析及精确年代学约束，导致学术界对额尔齐斯构造带的构造属性、运动学特征及动力学演化过程存在较多争论。本项目拟通过详细的野外构造观察与显微构造分析，结合锆石U-Pb年代学、40Ar/39Ar阶段加热和激光原位测年技术，厘定额尔齐斯构造带不同区段的变形样式及其时间框架，探究构造变形与区域岩浆-变质演化的时空耦合关系，揭示额尔齐斯构造带缝合的方式及地球动力学过程，为中亚造山带地体多向汇聚拼贴模式提供新的制约。

The terrane amalgamation plays a crucial role in the tectonic evolution of the Central Asian Orogenic Belt. The Irtysh Tectonic Belt represents a major suture zone within the Central Asian Orogenic Belt, to record the collisional history of the Chinese Altai orogen with the East/West Junggar terranes in NW China. The deformation history of the Irtysh Tectonic Belt has been widely studied in the past decades, but its structural patterns, kinematics and geodynamics are still poorly understood given limited structural analysis along the whole belt and the scarcity of geochronological constraints. This study will conduct detailed structural and microstructural analysis along the whole Irtysh Tectonic Belt, which will be complemented by geochronological analysis and regional tectonic synthesis. The research outcome is expected to unravel when and how the Chinese Altai orogen was collided with the East/West Junggar terranes, which will contribute to general understanding of accretion mechanisms of the Central Asian Orogenic Belt.