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: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=362208
• 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.

需要资金支持对碰撞山带核心区中地壳岩石构造演化的实地研究，以及U-Pb地质年代学(年龄和热史)实验室研究和研究生支持的相关费用。这项研究是合作的，包括在地质学、地质年代学、研究方案设计、成果交流和专业发展方面对学生的培训和指导做出重大贡献。研究约束：i)中地壳分布应变、韧性逆冲和伸展剪切带系统的几何、时间和作用；ii)岩石熔融、花岗岩生产和变形之间的关系；3)岩石探测地球物理数据与地表岩石直接相关的重要性；以及4)用于确定地质事件年代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，哪些过程起作用，以及核心区变形如何与造山带的其他部分联系起来。科迪勒研究特别有成果，因为选定的领域非常暴露，我们利用和建立在一流的地质和地球物理框架上。这些结果对于理解山脉带本身的演化和解释岩石探测仪地球物理数据非常重要。我们在以下方面取得了更复杂的以过程为导向的问题：i)地质年代学，对年龄数据的一般解释有影响，以及ii)构造地质和构造，这项研究的预期结果是重新解释构造和岩石中的热历史的意义和时间，修订了加拿大科迪勒山和格伦维尔西部的几何和构造模型，改进了对山带的建造和坍塌的理解，并指导学生。这些研究成果对致力于全球构造问题的地质学家和地质年代学家、科迪勒兰和格伦维尔地质学家、区域地质调查的野外测绘员和矿产勘探地质学家都很感兴趣。