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Recent Scientific Exchanges with Peking University

2017/10/18 15:37:31

 With the approaching of the 5.12 national day of disaster prevention and mitigation, invited by the geological and air college of Beijing University, Researchers Zhang Huiping (April 13), Zhou Yongsheng (April 27) and Wang Ping (May 5) went to the University to carry out communications on scientific and technological achievements and academic exchanges successively, representing a prelude to the opening of the Conference of Scientific and Technological Innovations in China Earthquake Work

Researcher Zhang Huiping gave a review on the existing achievements related to Cenozoic evolution of the northeastern margin of the Tibetan Plateau. He introduced the deformation magnitudes and styles in the region in three periods, including Paleogene, Neogene and Holocene, and helped the audiences to have an overall understanding of the tectonic deformation and geomorphic evolution of the northeastern margin of the Tibetan Plateau. This report was highly praised.

The tectonic rocks of the fault zone record the tectonic deformation microstructures at different levels of the fault and different stages of seismic cycles. High-temperature and high-pressure experiments of rock and the study on tectonic rocks of fault zones can not only simulate the strength and deformation mechanism at different depths of seismic faults, but also reveal the physical mechanisms on the process of the inter-seismic period, earthquake nucleation, coseismic slip, and post-seismic creep. Starting from the basic characteristics of the fault strength and deformation mechanisms changed with depth, Researcher Zhou Yongsheng presented the research progress from fault sliding friction to the plastic rheological experiments, as well as the influence on the rock rheology by water, solution, mineral reaction, and pre-existing fabric in rocks, which have aroused widespread interest.

Focusing on the thick valley sediments of the Yalu Zangbu Canyon, based on the extensive field investigations and chronology analyses, Researcher Wang Ping gave a preliminary conclusion that the erosion from the Yalu Zangbu River had incised deep in the plateau at least before about 2.5 Ma, and then, Nanchepawa block began to uplift rapidly, which blocked the ancient canyon and formed a giant knick point separating the upstream filling wedge and downstream steep canyon. The high erosion rate in the canyon is the direct feedback of the rock rapid uplift. In the late-middle Quaternary, the glacier on the Mountain Namjagbarwa started to become active, the glacier dam blocked the Yalu Zangbu Canyon, leading to the sedimentary facies in the valley changing from fluvial to lacustrine. The followed several short-time scale conversions of lacustrine facies may have some relationship with the climatic fluctuations of the glacial and interglacial epoch (or glacial and interglacial staircase) since the Mid-Pleistocene climatic was changed. Thus, it can be deduced that the tectonic uplift of the Nanchepawa block was earlier and stronger than the function of the glacial dam. On the other hand, it is the primary factor which impeded the headward erosion of the Yalu Zangbu River and maintained the stability of the edges of the Tibetan plateau. The lively explanation and the enthusiastic exchange with Wang help to broaden the researchers’ mind. The extensive and in-depth discussions on the focused issues in the related study area received the expected effects