Earth Science Frontiers ›› 2020, Vol. 27 ›› Issue (4): 150-157.DOI: 10.13745/j.esf.sf.2020.4.45

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Plate reconstruction based on fractal theory

ZHU Pingping(), CHENG Qiuming, ZHOU Yuanzhi, ZHANG Yuwei, SUN Jiazhen   

  1. 1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
    2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China
  • Received:2019-09-15 Revised:2020-04-20 Online:2020-07-25 Published:2020-07-25

Abstract:

The refinement and regionalization of global plate reconstruction is currently a hot topic in geological study. However, determination of shape distribution of reconstruction plates has not been fully carried out. Based on the existing plate reconstruction models, we analyzed the relationship between fractal dimensions of the reconstruction plates and frequency of global porphyry copper deposits since the Mesozoic. The results showed that the fractal dimensions of 250-65 Ma plates has a minimum at 65 Ma, which reflects the switching process from Pangea breakup to Amasia assembly. Moreover, the frequency anomalies of global porphyry copper deposits correspond well with the fractal dimension anomalies of reconstruction plates since 250 Ma, which suggests that the rapid change of plate morphology may affect the formation of porphyry copper deposits. Our findings provide new insights into evaluating authenticities of reconstruction plates and restricting morphology of ancient plates. Meanwhile, they can also provide reference data for the genesis of porphyry copper deposits.

Key words: fractal dimension, plate reconstruction, evaluation, porphyry copper deposit, frequency distribution

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