Collaborative Research: Suturing the Heart of Asia: Tectonics of the Mongol-Okhotsk Ocean Closure

合作研究：缝合亚洲心脏：蒙古-鄂霍次克洋闭合的构造

• 批准号: 1917645
• 负责人: Cari Johnson
• 金额: $ 67.21万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-08-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1917645&HistoricalAwards=false
• 关键词: Collaborative; Research; Suturing; Heart; Asia

The closure of ocean basins and formation of supercontinents throughout geologic history have directly influenced the distribution of natural hazards and natural resources. Changes in the distribution of ocean basins and land masses have also impacted the history of Earth's climate and the evolution of life. The modern-day continent of Asia consists of remnants of old continents, relict ocean basins, and fragments of island chains assembled over hundreds of millions of years. The ancient Mongol-Okhotsk Ocean was one of the largest oceans that previously separated fragments of the present core of the Asian continent, and yet remarkably little is known about it. This study examines the timing and mechanisms of the closure of the Mongol-Okhotsk Ocean through a multidisciplinary approach that includes field mapping and dating of key rock types. The project supports collaborations between diverse scientists from universities in the US and Mongolia, and training and mentoring of US and Mongolian students. Outreach efforts associated with this project include new educational resources for US and international students, along with new educational modules on plate tectonics, supercontinents, and geologic time for secondary school students.This project integrates stratigraphic, paleomagnetic, structural, and geochronologic datasets for the Mongol-Okhotsk suture that are assessed in the context of competing end-member hypotheses regarding modes of ocean basin closure and continental collision, such as major oroclinal bending as compared with scissor-like suturing. The project also investigates the role of strike-slip faulting during ocean closure and its relationship to subsequent orogenic collapse. Research outcomes are multidisciplinary and include: 1) stratigraphic analyses to document marine-nonmarine facies transitions and better delineate subtypes of remnant ocean basins; 2) structural datasets that document deformation in the nominal western hinge zone near the Hangay Dome; 3) verification of existing low-volume paleomagnetic data sets and new reference poles to improve APWP comparisons; and 4) development of an overarching geochronologic framework for key rock types. The project includes collaboration with international teams focused on regional magmatism and metallogeny.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.

在整个地质历史上关闭海洋盆地和超前的形成直接影响了自然危害和自然资源的分布。海盆和土地分布的变化也影响了地球气候的历史和生命的进化。亚洲的现代大陆由旧大陆，遗物海洋盆地和岛屿连锁店的碎片组成，这些碎片组成了数亿年。古老的蒙古 - 科特克海洋是以前将亚洲大陆核心碎片分离的最大海洋之一，但对此知之甚少。这项研究通过多学科方法检查了蒙古-Okhotsk海洋关闭的时间和机制，其中包括野外映射和关键岩石类型的日期。该项目支持美国和蒙古大学的不同科学家与我们和蒙古学生的培训和指导之间的合作。 Outreach efforts associated with this project include new educational resources for US and international students, along with new educational modules on plate tectonics, supercontinents, and geologic time for secondary school students.This project integrates stratigraphic, paleomagnetic, structural, and geochronologic datasets for the Mongol-Okhotsk suture that are assessed in the context of competing end-member hypotheses regarding modes of ocean basin closure and与剪刀样缝合相比，大陆碰撞，例如主要的口语弯曲。该项目还研究了在海洋封闭过程中的滑移断层的作用及其与随后的造基因塌陷的关系。研究成果是多学科的，包括：1）记录海洋 - 非陆碱相过渡的地层分析，并更好地描述残留的海洋盆地的亚型； 2）记录在Hangay圆顶附近的名义西铰链区域变形的结构数据集； 3）验证现有的小体积古磁数据集和新的参考杆，以改善APWP比较； 4）开发主要岩石类型的总体测量框架。该项目包括与专注于区域岩浆和金属基础的国际团队的合作。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛的影响审查标准通过评估来支持的。