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Yan YAN, Runmin PENG, Siyu CHEN, Junlin CHEN, Xiang QIN. 2020. Quantitative structure analysis of ore-bearing garnet-rich crystal in the Huogeqi mining area in Inner Mongolia and its significance. Journal of Geomechanics, 26(1): 135-150. doi: 10.12090/j.issn.1006-6616.2020.26.01.014
Citation: Yan YAN, Runmin PENG, Siyu CHEN, Junlin CHEN, Xiang QIN. 2020. Quantitative structure analysis of ore-bearing garnet-rich crystal in the Huogeqi mining area in Inner Mongolia and its significance. Journal of Geomechanics, 26(1): 135-150. doi: 10.12090/j.issn.1006-6616.2020.26.01.014
shu

Quantitative structure analysis of ore-bearing garnet-rich crystal in the Huogeqi mining area in Inner Mongolia and its significance

  • 1.

    School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China

  • 2.

    School of Earth Sciences and Space, Peking University, Beijing 100871, China

  • 3.

    SinoProbe Center, Chinese Academy of Geological Sciences, Beijing 100037, China

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Received Date:  13 August 2018
Revised Date:  16 December 2019
    Abstract
  • Crystal size distribution(CSD) is an important method to quantitatively analyze the structure of igneous rocks and metamorphic rocks. The CSD measured in metamorphic rocks provides quantitative information about crystal nucleation, growth rate and growth time during metamorphism. In this paper, garnet crystals from ore-bearing garnet-rich rock samples from the Huogeqi No. 2 deposit in Inner Mongolia are selected as the research object, supported by GIS software and R language. By using methods of spatial point pattern analysis, CSD analysis, spatial nearest neighbor analysis, spatial multi-distance analysis and Fry analysis, the microstructure variation characteristics of crystal spatial data and point spatial data are discussed. The segmented change record information of CSD curves is linked with the geological evolution history. The results show that the segmented CSD curves reflect the superimposed records of metamorphic events. The grain size distributions of different forms of crystals directly reflect the difference in the evolution history of regional metamorphic rocks and contact deformed rocks. The contact metamorphism involves a short period of high temperature, so the CSD produced is linear and not affected by annealing. The regional metamorphism involves long-term cooling at high temperature, so the initial linear CSD is later annealed and modified to bell shape. The nuclear density and CSD analysis results of ore-bearing garnet-rich samples also show two crystal group densities. It is considered that the differentiation of one crystal group may be related to the regional metamorphism in the orogenic process, while the other may be related to intrusive rocks that occurred in specific locations after regional metamorphism and activation.
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