Tectonic evolution of core zones of orogenic belts - Canadian cordillera and Grenville province

造山带核心区的构造演化——加拿大山脉和格伦维尔省

• 批准号: 105982-2006
• 负责人: Carr, Sharon
• 金额: $ 3.22万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=332504
• 关键词: Tectonic; evolution; core; zones; orogenic

Funds are requested to support field-based research on the tectonic evolution of mid-crustal rocks in core zones of collisional mountain belts, and related costs for U-Pb geochronology (age and thermal history) laboratory studies and graduate student support.  Research is collaborative and includes a significant contribution to the training and mentoring of students in geology, geochronology, research program design, communication of results and professional development.  Research constrains: i) the geometry, timing and role of distributed strain, and ductile thrust and extensional shear zone systems, in the mid-crust; ii) the relationships between melting in rocks, granite production and deformation; iii) the significance of Lithoprobe geophysical data by direct correlation with rocks at the surface; and iv) reasons for the complexities of geochronology data used to date geological events. The aim is to characterize how the mid-crust responded to and facilitated mountain building and collapse, what processes were operative, and how core-zone deformation relates to the rest of the orogen.  Cordilleran research is particularly fruitful because the chosen field areas are very well exposed, and we utilize and build on a superb geological and geophysical framework.  The results are important in understanding the evolution of the mountain belt itself, and for interpretation of Lithoprobe geophysical data.  We are making progress on more sophisticated "process-oriented" problems in: i) geochronology, with implications for how age data are generally interpreted, and ii) structural geology and tectonics, with implications for understanding mountain belts and older Precambrian geologic provinces.  The anticipated outcomes of this research are reinterpretation of the significance and timing of structures and thermal history in rocks, revised geometric and tectonic models for the Canadian Cordilleran and western Grenville, refined understanding of the construction and collapse of mountain belts and mentoring students.  The research results are of interest to geologists and geochronologists working on tectonic problems worldwide, Cordilleran and Grenville geologists, field mappers in regional geological surveys and mineral exploration geologists.

要求提供资金，支持对碰撞造山带核心区中地壳岩石构造演化的实地研究，并提供相关的U-Pb年代学费用（年龄和热历史）实验室研究和研究生支持。研究是合作的，包括对地质学，地质年代学，研究计划设计，研究限制：i）中地壳分布应变的几何形状，时间和作用，以及韧性逆冲和拉伸剪切带系统; ii）岩石熔融，花岗岩生产和变形之间的关系; iii）与地表岩石直接相关的Lithoprobe地球物理数据的重要性;以及iv）用于确定地质事件日期的地质年代学数据的复杂性的原因。其目的是描述中地壳如何响应和促进造山和崩塌，什么过程是有效的，以及核心区变形如何与造山带的其他部分相关。我们利用并建立了一个极好的地质和地球物理框架。这些结果对于理解山脉带本身的演变非常重要，以及解释Lithoprobe地球物理数据。我们在以下方面的更复杂的“面向过程”问题上取得了进展：i）地质年代学，以及如何解释年龄数据的含义，和ii）结构地质学和构造学，这一研究的预期成果是重新解释构造的意义和时间岩石的热历史、加拿大科迪勒堡和西部格伦维尔的几何和构造模型、对造山带的构造和崩塌的理解以及对学生的指导。研究结果对从事全球构造问题研究的地质学家和地质年代学家、科迪勒堡和格伦维尔地质学家、区域地质调查的野外制图者以及矿产勘探地质学家都很有意义。