Volume 46 Issue 1
Jan.  2021
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Article Navigation >  Earth Science  > 2021  >  46(1): 215-227
Wang Shengdong, Dai Peng, Zhang Kexin, Wang Jiaxuan, Wang Wen, 2021. Discovery and Sedimentary Sequences of a Special Paleoseamount within the Mazongshan Subduction Accretionary Complex in Beishan Orogen, Gansu Province. Earth Science, 46(1): 215-227. doi: 10.3799/dqkx.2020.255
Citation: Wang Shengdong, Dai Peng, Zhang Kexin, Wang Jiaxuan, Wang Wen, 2021. Discovery and Sedimentary Sequences of a Special Paleoseamount within the Mazongshan Subduction Accretionary Complex in Beishan Orogen, Gansu Province. Earth Science, 46(1): 215-227. doi: 10.3799/dqkx.2020.255
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Discovery and Sedimentary Sequences of a Special Paleoseamount within the Mazongshan Subduction Accretionary Complex in Beishan Orogen, Gansu Province

doi: 10.3799/dqkx.2020.255
  • 1.

    National Research Centre of Geoexploration Technology, Langfang 065000, China

  • 2.

    Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China

  • 3.

    State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China

  • 4.

    Institute of Geological Survey, China University of Geosciences, Wuhan 430074, China

  • 5.

    Institute of Exploration Techniques, Chinese Academy of Geological Sciences, Langfang 065000, China

  • Received Date: 2020-08-24
  • Publish Date: 2021-01-15
    Abstract
  • Paleoseamounts are key components of suture zones. In the Tianshan orogen located in the southwestern segment of the Central Asian Orogenic Belt, many paleoseamounts have been reported, while few were discovered in the Beishan orogen. Discovery of a paleoseamount can compensate for the lack of studies on seamounts in the Beishan orogen. After geological survey on the Yemaquan area in central Beishan orogen and measuring a profile, strata composed of basalts, basaltic tuffites and marbles with primitive sequences were discovered. The strata contain volcanic basement and carbonate cap, and the two segments primitively conformably contacted, indicating that the strata are fragments of a paleoseamount. The sedimentary structures and rock associations of the paleoseamount in the Yemaquan area indicate that they were deposited in a seamount slope. The seamount fragment in this study trends NWW-SEE and the southeastern part approaches the seamount top. The basalts in the seamount are enriched in large iron lithophile elements and depleted in high field strength elements, showing characteristics of island arc basalts. The seamount in this study is an oceanic arc type seamount. The rocks in the Yemaquan area were deposited in seamount slope facies and trended NWW-SEE after they were dismembered.

     

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