Collaborative Research: The Role of the Porcupine Fault System in the Mesozoic Opening of the Arctic Ocean

合作研究：豪猪断层系统在北冰洋中生代张开中的作用

• 批准号: 2314532
• 负责人: Justin Strauss
• 金额: $ 24.74万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2314532&HistoricalAwards=false
• 关键词: Collaborative; Research; Role; Porcupine; Fault

Despite its proven economic resources, the Arctic Ocean is the last modern ocean basin on the planet whose origin remains highly controversial. This is largely due to its perennial ice cover and lack of detailed scientific examination by shipborne research vessels. The goal of the proposed research is to examine the Porcupine fault system in northeastern Alaska and northwestern Yukon, Canada, which likely played an important, yet poorly understood, role in the opening of the Arctic Ocean. The study promotes a new collaboration between early career and senior academic researchers at four U.S. institutions and government research agencies in both the United States and Canada, including the development of a new geologic mapping effort across the international border. The collaborative international effort will generate research opportunities and training for undergraduate and graduate students at the academic institutions, as well as educational and outreach opportunities in a rural Native Alaskan community in collaboration with the United States Fish and Wildlife Service and Las Vegas, NV, through integration with the NSF-supported GeoPaths program. Results of the project will also be conveyed to the public through the development of an informational pamphlet sponsored and distributed by the U.S. Fish and Wildlife Service in Alaska, as well as accessible public lectures at the participating universities.The canonical tectonic model for the opening of the Canada Basin of the Arctic Ocean involves greater than 60º counterclockwise rotation of northern Alaska away from the Canadian Arctic Islands in the Jurassic–Cretaceous, but more recent models highlight potentially significant strike-slip displacement along the northern margin of North America. Critically, little is known about the fault systems that may have accommodated these margin-parallel displacements. The goal of the proposed research is to examine the Porcupine fault system, a long-lived craton-bounding structure in northeastern Alaska and northwestern Yukon, Canada, that has a poorly understood Mesozoic–Cenozoic reactivation history but likely played a role in the opening of the Canada Basin. The reflects a new collaboration between Early Career and senior academic researchers, federal and state/territory geoscientists, and undergraduate/graduate students that will not only further our understanding of Mesozoic–Cenozoic tectonic and paleogeographic models for the circum-Arctic, northern Pacific, and northern North American Cordillera, but it will also provide new insights into the dynamics and chronology of crustal deformation in polyphase brittle fault systems. In addition, the research will test the utility and feasibility of combining multiple established and new fault geo- and thermo-chronometers to these complex systems. As a result, this project will generate broad interest from the tectonics, structural geology, and geo-/thermo-chronology communities, as well as cross-disciplinary interest in Arctic sciences, economic geology, sedimentary geology, petrology, geophysics, and geodynamics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

尽管北冰洋拥有丰富的经济资源，但它是地球上最后一个现代海洋盆地，其起源仍然存在很大争议。这在很大程度上是由于其常年冰层覆盖和船上研究船缺乏详细的科学检查。拟议研究的目标是检查阿拉斯加东北部和加拿大育空地区西北部的豪猪断层系统，该断层系统可能在北冰洋的开放中发挥了重要但知之甚少的作用。该研究促进了美国四个机构和美国和加拿大政府研究机构的早期职业和高级学术研究人员之间的新合作，包括开发新的跨国际边界的地质测绘工作。国际合作将为学术机构的本科生和研究生提供研究机会和培训，并与美国鱼类和野生动物管理局和内华达州拉斯维加斯合作，通过与NSF支持的GeoPaths计划整合，为阿拉斯加原住民农村社区提供教育和推广机会。该项目的成果还将通过编写一本由美国阿拉斯加鱼类和野生动物管理局赞助和分发的信息小册子传达给公众，北冰洋加拿大海盆开放的典型构造模型涉及北方阿拉斯加逆时针旋转超过60º，远离加拿大北极群岛在侏罗纪-白垩纪，但最近的模型强调潜在的显着走滑位移沿着北美北方边缘。至关重要的是，很少有人知道的断层系统，可能有容纳这些边缘平行位移。拟议的研究的目标是检查豪猪断层系统，一个长寿的阿拉斯加东北部和西北部育空地区，加拿大，有一个知之甚少的中新生代复活的历史，但可能发挥了作用，在加拿大盆地的开放。这反映了早期职业和高级学术研究人员，联邦和州/地区地球科学家以及本科生/研究生之间的新合作，这不仅将进一步加深我们对环北极，北方太平洋和北方北美科迪勒拉的中新生代构造和古地理模型的理解，但它也将为多期脆性断裂系统中地壳变形的动力学和年代学提供新的见解。此外，研究将测试的效用和可行性相结合的多个建立和新的故障地质和热计时器，这些复杂的系统。因此，该项目将引起构造学、构造地质学和地质/热年代学社区的广泛兴趣，以及北极科学、经济地质学、沉积地质学、岩石学、地球物理学和地球动力学的跨学科兴趣。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。