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AOGS 17th Annual Meeting

28 Jun - 4 Jul 2020
Sono Belle Vivaldi Park, Hongcheon

SS04 – The Geologic Evolution of NE Asia

Thu-02 Jul 2020 | 13:30 – 15:30 | Tower B, Lavender II

Wenjiao XIAO
Institute of Geology and Geophysics, Chinese Academy of Sciences

“Magmatism and Deformation History Along the Ne Asian Continental Margin from Ca. 95 to 30 Ma: Possible Izanagi-pacific Ridge Subduction in the Early Cenozoic”

Wenjiao XIAO1#+, Kai LIU1, Jinjiang ZHANG2, Simon WILDE3

1Institute of Geology and Geophysics, Chinese Academy of Sciences,  2Peking University, 3School of Earth & Planetary Sciences, Curtin University


Previous plate reconstruction in the Paleo-Pacific domain indicates that the Izanagi and Pacific plates influenced the NE Asian continental margin during the Mesozoic and Cenozoic, respectively. However, it remains unclear that how and when the transition from the Izanagi to Pacific subduction occurred. This may be because most evidence used before was from the oceanic crust. However, the onshore geological records are poorly understood. To solve this problem, we review the recently published data and recognize three magmatic episodes, a magma gap and four deformation stages from ca. 95 to 30 Ma. The margin-parallel Izanagi-Pacific ridge subduction was proposed to explain the changing magmatic and deformation signatures and other regional events in the early Cenozoic. From ca. 95 to 65 Ma, the N- or NNW-directed subduction of the Izanagi Plate triggered the sinistral shearing of the NNE-striking faults. Arc magmas at that time were involved with importantly old crustal materials. From ca. 65 to 55 Ma, the NWW-striking transform faults and ridge segments were subducted, developing small slab windows and facilitating the input of asthenosphere. Local extension was active above these windows. During ca. 55 to 45 Ma, the ridge was totally subducted. A margin-wide slab window was opened, forming the arc magma gap and extension. Massive asthenosphere upwelling caused the extensive accretion of juvenile materials. From ca. 45-30 Ma, the dextral NNE-trending faults fit the W-directed subduction of the Pacific plate. New arc magmas were melted from the juvenile materials and thus are isotopically depleted.


Biography


Prof. Wenjiao Xiao is Vice Director and professor at the Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences (CAS) and professor at the Institute of Geology and Geophysics, CAS. He got his PhD from the Institute of Geology, CAS, in 1995. He is now a Member of the CAS, GSA Fellow and Member of the Leibniz Society of Sciences (Berlin), Germany. Wenjiao is a Science Editor of Geological Society of America Bulletin, and is/was subject editor/associate editor/editorial board member of Heliyon, Journal of the Geological Society, Episodes, International Journal of Earth Sciences, Journal of Asian Earth Sciences, Gondwana Research, Ore Geology Reviews, Terra Nova, Acta Geologica Sinica, Geoscience Frontiers, National Science Review, and Science Bulletin. Among other Chinese journals, he is Editor-in-Chief of Chinese Journal of Geology and Associate Editor of Geotectonica et Matellogenia. He has been invited as reviewers for international funding bodies/positions including the National Science Foundation of the United States of America, Czech Science Foundation, Chilean National Science and Technology Commission, and European Council. Wenjiao got The Second Award of National Natural Science Award of China in 2012, The First Award of Science and Technology Award of Xinjiang Uyghur Autonomous Region, China in 2012, and the Huang Jiqing Award of the Geological Society of China in 2010. Wenjiao was/is a Co-chief of IGCP 592 and IGCP 662. His research interests include sedimentology and tectonic evolution of orogenic belts, continental growth and their metallogeny. Wenjiao has published more than 300 papers with 18,682 Web of Science citations (H-index 62) and 24,471 GoogleScholar Citations (H-index 72).

 

Organized by:
aogs  aogs
Supported By:
gwcb
Korean Society of Earth and Exploration Geophysicists
The Geological Society of Korea
The Korean Society of Oceanography
Korean Meteorological Society
Korean Society of Atmospheric Environment
The Korean Space Science Society
The Korean Astronomical Society
The Korean Society of Economic and Environmental Geology
The Korean Society of Remote Sensing
The Korean Association of Geographic
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