Structural analysis and remote sensing of the East Range, Sudbury Impact Structure, Canada

位于加拿大安大略省地盾的1.85Ga萨德伯里撞击构造受到造山变形的影响，通过大规模的逆冲和褶皱作用导致构造缩短。了解撞击引起的陨石和岩浆体的三维几何结构对于推断陨石坑演化过程中的地质过程至关重要。建议结合三种地球科学技术来推断造山变形之前的碰撞结构的几何形状：(1)主要与理解变形中的褶皱有关的场-结构分析；(2)碰撞后变形的完整的三维运动平衡；(3)使用粘性材料来约束碰撞结构的延性变形的模拟模拟。野外构造分析将包括检查萨德伯里火成岩杂岩主块与太古宙寄主岩石接触带的岩石组构，以及绘制太古宙岩石中矿物形状组构的地图。运动学建模将以撞击构造关键区域的实地结构数据为基础，同时也以已公布的地球物理和构造地质数据为基础。这项研究旨在作为国际大陆钻探计划的试点研究，预计将有助于确定萨德伯里地区最适合进行深部钻探的地点(S)。

The 1.85 Ga Sudbury Impact Structure, located in the Canadian Shield of Ontario, was affected by orogenic deformation that led to shortening of the Structure by large-scale thrusting and folding. Knowledge of the impact-induced 3-D geometry of impactites and magmatic bodies of the Structure is paramount to infer geological processes during crater evolution. A combination of three geoscientific techniques is proposed to infer the geometry of the Impact Structure prior to orogenic deformation: (1) field-structural analysis pertaining chiefly to understand of folding in deformation, (2) a complete 3-D kinematic balancing of post-impact deformation and (3) analoque modelling using viscous materials to constrain ductile deformation of the Impact Structure. Field-structural analyses will include examination of petrofabrics in the contact zone of the main mass of the Sudbury Igneous Complex with Archean host rocks as well as mapping of mineral shape fabrics in Archean rocks. Kinematic modelling will be based on field-structural data from critical areas of the Impact Structure but also published geophysical and structural geological data. The study is als intended as a pilot study to the International Continental Drilling Program and is expected to contribute to help identify the most suit- able location(s) for deep drilling in the Sudbury area.