Tectonic signatures in carbonate platform sequences and diagenesis proximal and distal to convergent margins

目前对碳酸盐岩台地系统的认识主要来自于构造相对稳定的地质背景下的现代和古代例子，如沿大陆拖曳边缘发现的例子；在远离辐合边缘的前陆盆地内部；在板块内部的海洋平台上。本研究将探讨碳酸盐岩台地在局部和区域构造作用下的沉积稳定性、地层几何和成岩作用。两个地质区域允许研究离汇聚（俯冲）板块边界不同距离的构造特征。(1)在加拿大中部（安大略省东南部），一个晚奥陶世（4.5亿年）的碳酸盐岩台地覆盖在下伏和浅埋的区域（200公里长）断层系统（*研究成果将引起全球地质界的兴趣）。该研究将扩展目前有限的碳酸盐岩沉积体系构造敏感性知识，并在碰撞板块边界的近端和远端位置对比台地结构。该研究将有助于描述从会聚边界进入板块内部的沉积不稳定的潜在构造梯度，并解决继承构造的重新激活对年轻沉积体系地层格局的影响。结果将通过地质会议和同行评议的期刊（国家的、国际的）传播。这个基于安大略省的项目将引起社区层面的兴趣，因为古老的断层系统是许多农村和城市社区的基础，并且毗邻活跃的西魁北克地震带。这种接近性强调了潜在的断层重新激活是现代的，而不仅仅是古代的地质后果

The current state of knowledge about carbonate platform systems is dominated by modern and ancient examples from relatively tectonically stable geologic settings such as found along continental trailing margins; in the interior of foreland basins distant from convergent margins; and, on oceanic platforms within plate interiors. The proposed study will investigate the depositional stability, stratigraphic geometry, and diagenesis of carbonate platforms in response to local and regional tectonism. Two geologic regions allow study of tectonic signatures at different distances from convergent (subducting) plate boundaries. (1) In central Canada (SE Ontario), a Late Ordovician (450 million years) carbonate platform overlies a regional (200 km long) fault system within the underlying and shallowly buried (*Research outcomes will be of interest to the global geological community. The research will expand on the current limited knowledge about tectonic sensitivity of carbonate depositional systems, and contrasting platform architecture in proximal to distal positions from collisional plate boundaries. The study will help characterize a potential tectonic gradient of depositional instability directed into the plate interior from convergent boundaries, and address the impact of reactivation of inherited structure on stratigraphic patterns in younger sedimentary systems. Dispersal of results will be through geological conferences and peer-reviewed journals (national, international). There will be community-level interest in the Ontario-based project because the ancient fault system underlies many rural and urban communities, and lies adjacent to the active Western Quebec Seismic Zone. Such proximity underscores potential fault reactivation as a modern, not just ancient, geological consequence.**