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.

关于Rodinia和Pangea的地震层析成像和重建的研究表明，至少在最后1 GA中，地球的披风对流在很长的波长中占主导地位。最近关于古磁性的研究还表明，与Rodinia SuperContine的研究还表明，与Rodinia Supercontine的研究可能是可能的真实极性游荡（TPW）。但是，均未众所周知，披风对流的长波长平台或超大型过程的形成过程均未得到充分了解。 拟议的工作旨在了解地幔对流的长波长平台及其与包括TPW在内的超大型过程的关系。我们建议用逼真的流变和多个大陆块制定3-D球形对流模型，以确定地幔对流的长波长平台上的控制和超级领域的组装和分裂的循环过程。这项研究将支持博士学位的研究生，并包括与Z-X博士的国际合作。 Li来自西澳大利亚大学。