《科学大讲堂 第240期》钟时杰 教授：类地行星的大尺度结构与动力学：从火星的塔尔西斯隆起、月球的月海玄武岩到地球的超大陆旋回

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  • 题目: 类地行星的大尺度结构与动力学：从火星的塔尔西斯隆起、月球的月海玄武岩到地球的超大陆旋回
  • 主讲人：钟时杰 教授 @ 科罗拉多大学博尔德分校
  • 时间：2026年5月22日 10:30-12:00
  • 地点：理学院一楼1142报告厅

主讲人简介

Professor Shijie Zhong is a professor of Physics and Geophysics in the Department of Physics at the University of Colorado at Boulder, USA. He has a broad research interest including mantle and lithospheric dynamics of the terrestrial planets (the Earth, the Moon, Mars, and Venus), the interaction among sea level change, (de)glaciation, gravity change and solid Earth’s deformation for timescales ranging from recent decades for West Antarctica and Greenland to the last glacial cycle (i.e., the last 100,000 years) globally, and high-performance scientific computing. He is the main developer of open-source software packages CitcomS for modeling mantle convection and CitcomSVE for modeling planetary viscoelastic response to surface loads and tidal loads. Professor Zhong was awarded with a David and Lucile Packard Fellowship, a Sloan Research Fellowship, and a US-NSF Early Career award. He was elected as a Fellow of American Geophysical Union in 2014. Before joining the University of Colorado in 2000, he was a research scientist at Massachusetts Institute of Technology and a post-doctoral fellow at California Institute of Technology. He has collaborated with scientists globally and had a visiting fellow/professor position at Oxford University in UK, IPGP of France, University of Nice of France, and Australian National University. Professor Zhong received his bachelor’s degree from the University of Science and Technology of China (Hefei), a master’s degree from the Institute of Geophysics (Beijing) of Chinese Academy of Sciences and a PhD degree from the University of Michigan.

讲座简介

The present-day Earth’s mantle structure, as seen in seismic imaging, is dominantly at long-wavelength, more specifically at spherical harmonic degree-2 with two large seismically slow (i.e., warm) superplume structures in the lower mantle beneath Africa and central Pacific surrounded by circum-Pacific seismically fast (i.e., cold) structures that are evidently related to the past subduction history. While the mantle structures in the geological past are largely unknown, large-scale tectonism and volcanism for the last billion years have been predominated by supercontinent cyclic process, which may hint at an even longer wavelength mantle structure at degree-1 or hemispherical asymmetry. Interestingly, the Moon and Mars also display hemispherical asymmetric structures including mare basalt volcanism on the Moon and crustal dichotomy and Tharsis volcanism on Mars that were formed in their geological past. However, it had been a significant challenge in mantle dynamics studies to produce long-wavelength convection in either mobile-lid or stagnant-lid convection regime. This presentation discusses how mantle and lithospheric viscosity structures may help generate very long-wavelength convection at degrees 1 and 2 and how long-wavelength convection may provide a framework to understand the relevant geological and geophysical observations.

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