Earth Science Frontiers ›› 2018, Vol. 25 ›› Issue (4): 1-10.DOI: 10.13745/j.esf.sf.2018.4.45

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 Preliminary discussion on the role of microcontinental blocks in the evolution of the Central Asian orogenic belt: taking the Xilinhaote microcontinental block as an example.

SHAO Ji'an,TIAN Wei,TANG Kedong,ZHOU Xinhua   

  1. 1. The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; School of Earth and Space Sciences, Peking University, Beijing 100871, China 2. Shenyang Institute of Geology and Mineral Resources, Shenyang 110034, China 3. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
  • Received:2018-01-23 Revised:2018-04-04 Online:2018-07-15 Published:2018-07-15

Abstract:  The old continental crustal massifs or inlaid microcontinental blocks in the Central Asia Orogenic Belt characterize a previous PaleoMongolia ocean. Discussed in this work is the Xilinhaote microcontinental block. The Xilinguole complex—basement of the microcontinental block—has experienced the Early Paleozoic tectothermal events yet still contains older Precambrian zircons. The Xilinguole microcontinental block also acted as pillar when the orogenic belt suffered strong extensional deformation and underplating in the Late Paleozoic (C2P1): while rifts occurred at north and south edges of the microcontinental block, a stable littoralneritic facies sedimentary environment was maintained inside the block. At the same time, in the event of underplating from the upper mantle, tectonic structure of the orogenic zone remained stable, as the microcontinental block further accreted vertically and consolidated through certain orogenic bimodal magmatic activity and alkalic granite emplacement associated with block remelting. It has been the purpose of this work to comprehend some of the unique regional geological phenomena that are closely related to underplating during the Late Carboniferous.

Key words: microcontinental block, Central Asia Orogenic Belt, Late Paleozoic, consolidation, underplating

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