Collaborative Research: How does it end? Exploring thrust terminations of an intra-continental strike-slip fault, north Tibet

合作研究：它如何结束？

• 批准号: 1914503
• 负责人: Peter Haproff
• 金额: $ 4.08万
• 依托单位: University of North Carolina at Wilmington
• 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: 2019-07-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1914503&HistoricalAwards=false
• 关键词: Collaborative; Research; How; does; end

Plate tectonic theory suggests that internally rigid tectonic plates interact with one another along narrow plate boundaries. However, deformation is often distributed across the interior of continents, such as in the Asian continent along the Himalayan mountain belt, where significant faulting and folding occurs thousands of kilometers from the boundaries between the Indian and Pacific plates. Some of the largest features in the region are east-west oriented strike-slip faults, such as the Haiyuan fault in north Tibet. This project investigates the western termination of the Haiyuan fault to determine how deformation changes from strike-slip fault motion to folding and thrust faulting within the interior of the mountain belt. Furthermore, structures like the Haiyuan fault are sources of major seismic hazards for densely-populated regions within the Asian continent. Thus, constraining the style, magnitude, and rate of deformation along the length of these strike-slip faults will aid in future hazard and risk assessment. Other societally relevant impacts of this project include: support of early-career faculty to establish globally competitive research programs; training a PhD student and mentoring two undergraduates in a science, technology, engineering and mathematics (STEM) discipline; international collaboration with researchers and institutions; and outreach at community engagement events with a focus on earthquake hazards. The project also supports the development of a modern publicly-accessible geologic mapping website that features techniques and information about digital tablet-based field mapping and digital elevation model (DEM) construction, including methods of incorporating map data into open-access online archives.The intra-continental response to edge-driven plate boundary conditions is a central topic in continental tectonics. The Himalayan-Tibetan orogen results from progressive Cenozoic India-Asia convergence, and the largest structures within the interior of this orogen are large strike-slip faults. Therefore, Tibet is an ideal testing ground to determine how strike-slip faulting accommodates and redistributes strain in a collisional orogen. This multidisciplinary investigation explores the western termination of the left-slip Haiyuan fault within northern Tibet, where strike-slip faulting abruptly transitions to thrust faulting. Specifically, a combination of geologic bedrock and neotectonics mapping, construction of digital elevation models (DEMs) using structure-from-motion (SfM) methods, surface-age dating (i.e., optically stimulated luminescence and radiocarbon), and low-temperature thermochronology are employed to (1) constrain Quaternary slip rates along the western Haiyuan fault segments, and (2) systematically document how strike-slip deformation transfers to a range-bounding, thrust-fault system in the central Qilian Shan thrust belt. Field observations of the kinematics of the western termination of the Haiyuan fault are used to test models for plate-convergence-normal strike-slip faulting in the Himalayan-Tibetan orogen, including (1) clockwise-fault rotation, (2) extrusion-fault models, and (3) strain transfer models. Insights gained from studying the Haiyuan fault can be applied to other zones of intra-continental deformation.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.

板块构造理论表明，内部刚性构造板沿狭窄的板块边界相互相互作用。但是，变形通常分布在整个大陆的内部，例如在喜马拉雅山带沿线的亚洲大陆，那里发生了明显的断层和折叠，从印度和太平洋板之间的边界发生了数千公里。该地区一些最大的特征是东西方的滑移断层，例如北西藏的海尤恩断层。该项目调查了海尤恩断层的西部终止，以确定变形从走滑断层运动转变为山带内部内部的折叠和推力断层。此外，诸如Haiyuan断层之类的结构是亚洲大陆范围内人口稠密地区的主要地震危害的来源。因此，限制沿这些滑移断层长度的变形的样式，幅度和变形率将有助于未来的危害和风险评估。该项目的其他社会相关影响包括：早期职业教师建立全球竞争性研究计划的支持；培训一名博士生，并指导两名科学，技术，工程和数学（STEM）学科的大学生；与研究人员和机构的国际合作；并在社区参与活动中进行外展活动，重点是地震危害。 The project also supports the development of a modern publicly-accessible geologic mapping website that features techniques and information about digital tablet-based field mapping and digital elevation model (DEM) construction, including methods of incorporating map data into open-access online archives.The intra-continental response to edge-driven plate boundary conditions is a central topic in continental tectonics.喜马拉雅 - 藏基因造山基因由渐进的新生代印度 - 亚洲融合产生，并且该基因内部内部最大的结构是大滑滑断层。因此，西藏是一个理想的测试地面，用于确定滑滑断层如何适应碰撞中的菌株和重新分布菌株。这项多学科的调查探讨了西藏北部左滑动海牛断层的西方终止，在那里，滑移断层突然过渡到推力断层。具体而言，使用从结构上（SFM）方法的结构（SFM）方法，表面年龄的年代（即光学刺激的发光和放射性碳）以及低（1）构成（1）构成（1）沿（1）构成（1）构成（1）的Quatern prody（1）记录如何在中央Qilian Shan推力带中转移变形转移到范围内的，推力过失系统。 Haiyuan断层西部终止的运动学的现场观察用于测试喜马拉雅 - 藏基因造山机中板连接范围 - 正常滑移断层的模型，包括（1）顺时针道旋转，（2）挤压模型，以及（3）应变转移模型。从研究海尤人的断层中获得的见解可以应用于群内内部变形的其他区域。该奖项反映了NSF的法定任务，并认为使用基金会的智力优点和更广泛的影响审查标准，认为值得通过评估来获得支持。

项目成果

Paleoproterozoic Plate Tectonics Recorded in the Northern Margin Orogen, North China Craton

• DOI: 10.1029/2022gc010662
• 发表时间: 2022-11
• 期刊: Geochemistry
• 影响因子: 3.7
• 作者: Chen Wu;Guosheng Wang;Zhiguang Zhou;P. Haproff;A. Zuza;Wenyou Liu

Tectonic setting of metamorphism and exhumation of eclogite-facies rocks in the South Beishan orogen, northwestern China

北山南造山带榴辉岩相岩石变质作用与折返作用的构造背景

• DOI: 10.1130/ges02548.1
• 发表时间: 2022
• 期刊: Geosphere
• 影响因子: 2.5
• 作者: Li, Jie;Wu, Chen;Chen, Xuanhua;Yin, An;Zuza, Andrew V.;Haproff, Peter J.;Chen, Yanfei;Wang, Luojuan;Shao, Zhaogang
• 通讯作者: Shao, Zhaogang

Cenozoic kinematic histories of the Tidding and Lohit thrusts in the northern Indo-Burma Ranges: Implications for crustal thickening and exhumation of Gangdese lower arc crust along the Indus-Yarlung suture zone

印缅山脉北部蒂丁和洛希特逆冲断层的新生代运动史：印度河-雅鲁藏布江缝合带冈底斯下弧地壳增厚和折返的意义

• DOI: 10.1130/b36323.1
• 发表时间: 2022
• 期刊: GSA Bulletin
• 作者: Haproff, Peter J.;Levy, Drew A.;Zuza, Andrew V.;Hooker, Julian D.;Heizler, Matthew T.;Stockli, Daniel F.;Braza, Mary
• 通讯作者: Braza, Mary

Kinematic evolution of a continental collision: Constraining the Himalayan-Tibetan orogen via bulk strain rates

• DOI: 10.1016/j.tecto.2020.228642
• 发表时间: 2020-12
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: A. Zuza;Y. Gavillot;P. Haproff;Chen Wu

Accommodation of India–Asia convergence via strike-slip faulting and block rotation in the Qilian Shan fold–thrust belt, northern margin of the Tibetan Plateau

• DOI: 10.1144/jgs2020-207
• 发表时间: 2021-01
• 期刊: Journal of the Geological Society
• 影响因子: 2.7
• 作者: F. Cheng;A. Zuza;P. Haproff;Chen Wu;C. Neudorf;Hong Chang;Xiangzhong Li;Bing Li