The Formation of Long-wavelength Mantle Structure and Its Relationship to Supercontinent Cycles and True Polar Wander

长波长地幔结构的形成及其与超大陆旋回和真极地漂移的关系

• 批准号: 0711366
• 负责人: Shijie Zhong
• 金额: $ 23万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0711366&HistoricalAwards=false
• 关键词: Formation; Long; wavelength; Mantle; Structure

Studies of seismic tomography and reconstruction of supercontinents Rodinia and Pangea indicate that the Earth's mantle convection is predominated at very long wavelengths at least in the last 1 Ga. Recent studies on paleomagnetism also suggest possible true polar wander (TPW) events associated with Rodinia supercontinent. However, neither the formation process for long-wavelength platforms of mantle convection nor supercontinent process is well understood. The proposed work seeks to understand the underlying physics for long-wavelength platforms of mantle convection and its relation to supercontinent processes including TPW. We propose to formulate 3-D spherical mantle convection models with realistic rheology and with multiple continental blocks to determine the controls on long-wavelength platforms of mantle convection and cyclic processes of assembly and breakup of supercontinents. This research will support a PhD level graduate student, and includes international collaboration with Dr. Z-X. Li from University of Western Australia.

对罗迪尼亚和盘古大陆的地震层析成像和重建研究表明，至少在最近1ga，地幔对流以超长波长为主。最近的古地磁研究也提出了与罗迪尼亚超大陆有关的可能的真极漂移事件。然而，对地幔对流长波台地的形成过程和超大陆过程都没有很好的认识。提出的工作旨在了解地幔对流长波平台的潜在物理特性及其与包括TPW在内的超大陆过程的关系。我们建议建立具有真实流变学和多个大陆块体的三维球形地幔对流模型，以确定地幔对流的长波长平台和超大陆组装和分裂的循环过程的控制。这项研究将支持一名博士水平的研究生，并包括与Z-X博士的国际合作。来自西澳大利亚大学的李。