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

1.85 Ga萨德伯里冲击构造位于加拿大安大略省地盾内，受造山变形的影响，大规模的逆冲和褶皱使该构造缩短。了解撞击引起的三维几何形状和构造的岩浆体对于推断火山口演化过程中的地质过程至关重要。提出了三种地球科学技术的组合来推断造山变形之前的冲击构造的几何形状：(1)场-构造分析，主要用于理解变形中的褶皱；(2)碰撞后变形的完整三维运动学平衡；(3)使用粘性材料来约束冲击构造的延性变形的模拟建模。野外构造分析将包括检查萨德伯里火成岩杂岩主体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的矿物形状组构。运动学建模将基于来自冲击构造关键区域的现场结构数据，以及已发表的地球物理和构造地质数据。该研究还将作为国际大陆钻井计划的试点研究，并有望帮助确定萨德伯里地区最适合深钻的位置。

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.