Earth Science Frontiers ›› 2024, Vol. 31 ›› Issue (3): 218-234.DOI: 10.13745/j.esf.sf.2023.2.68

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The metallogenic series in West Qinling, Gansu Province, and their quantitative estimation

HE Jinzhong1(), DING Zhenju2, ZHU Yongxin1, ZHEN Hongxu1, ZHANG Wanren1, LIU Jie1   

  1. 1. Geological Survey of Gansu Province, Lanzhou 730000, China
    2. China University of Geosciences(Wuhan), Wuhan 430074, China
  • Received:2022-11-10 Revised:2023-01-10 Online:2024-05-25 Published:2024-05-25

Abstract:

This paper is focused on determination of metallogenic series in West Qinling and their different combinations, in which the basic factors are all minerals specified by Chinese Mineral Resources Geology Project, and furtherly makes known their significance in ore-searching by quantitative estimation results. According to the principle for determination of metallogenic series, 21 metallogenic series, and 84 models of a class of deposits were determined based on the distribution characteristics of 39 kinds of minerals in West Qinling of Gansu Province. In the light of metallogenesis, metallogenic setting, and tectonic cycles to which the metallogenic series correspond, 5 metallogenic series assemblages, 12 metallogenic series types, and 4 metallogenic series groups were determined, respectively. As there were sub-tectonic cycles, some sub-metallogenic series groups were recognized in Variscan-Yanshanian tectonic cycle, and furtherly, the evolution regularity of metallogenic series in tectonic cycles was discussed. Two concepts named resources equivalent, and resources equivalent density were put forward; together with other metallogenic extent indices and metallogenic intensity indices, the quantitative estimation of metallogenic series and their different combinations were effectively carried out. The research results are as follows: The metallogenic diversity of metallogenic series is positively correlated to the intensity of intermediate-acidic magmatic activity. The advantaged metallogenic series are Variscan-Indosinian metallogenic series related to magmatism in Middle Qinling, Late Paleozoic sedimentary metallogenic series in Middle Qinling, Variscan-Indosinian ore-bearing fluidization metallogenic series in Middle Qinling, Indosinian-Yanshanian metallogenic series related to magmatism in South Qinling, Paleozoic-Triassic sedimentary metallogenic series in South Qinling, and Variscan-Indosinian ore-bearing fluidization metallogenic series in South Qinling. The advantaged metallogenic series types are those of superimposition of post-collision on foreland basin, and superimposition of post-collision on magmatic arc.

Key words: metallogenic series, metallogenic diversity, metallogenic extent, metallogenic intensity, advantaged metallogenic series, advantaged metallogenic series type

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