地学前缘 ›› 2024, Vol. 31 ›› Issue (3): 218-234.DOI: 10.13745/j.esf.sf.2023.2.68

• 金属成矿作用与成矿预测 • 上一篇    下一篇

甘肃西秦岭矿床成矿系列及其量化评价

何进忠1(), 丁振举2, 朱永新1, 甄红旭1, 张万仁1, 刘杰1   

  1. 1.甘肃省地质调查院, 甘肃 兰州 730000
    2.中国地质大学(武汉), 湖北 武汉 430074
  • 收稿日期:2022-11-10 修回日期:2023-01-10 出版日期:2024-05-25 发布日期:2024-05-25
  • 作者简介:何进忠(1963—),男,博士,正高级工程师,从事矿床学与地球化学研究工作。E-mail: 908035925@qq.com
  • 基金资助:
    中国地质调查局地质调查项目(DD20221695);中国地质调查局地质调查项目(DD20190379);中国地质调查局地质调查项目(DD20160346);中国地质调查局地质调查项目(DD20160050-20);甘肃省自然资源厅科技创新项目(202231)

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

摘要:

本文以中国矿产地质志项目规定的矿种为基本因素,厘定甘肃西秦岭矿床成矿系列及其各种归并形式,并通过量化评价结果反映其找矿意义。基于39种既有矿产的分布特征,按照矿床成矿系列厘定原则,在甘肃西秦岭厘定了21个矿床成矿系列和84个矿床式。根据矿床成矿系列对应的成矿作用、成矿地质环境和构造旋回,将该区域的矿床成矿系列归并为5个矿床成矿系列组合、12个矿床成矿系列类型和4个矿床成矿系列组;针对华力西—燕山期构造旋回中存在构造亚旋回的特点,在其中划分出了矿床成矿系列亚组;探讨了矿床成矿系列在构造旋回中的演化规律。提出了资源当量和当量密度概念,结合其他成矿广度指数和成矿强度指数,有效地进行了矿床成矿系列及其3种归并形式的量化评价。结果表明:矿床成矿系列的成矿多样性与中酸性岩浆活动强度正相关;优势矿床成矿系列是中秦岭华力西—印支期岩浆相关矿床成矿系列、中秦岭晚古生代沉积矿床成矿系列、中秦岭华力西—印支期含矿流体矿床成矿系列、南秦岭印支—燕山期岩浆相关矿床成矿系列、南秦岭古生代—三叠纪沉积矿床成矿系列和南秦岭华力西—印支期含矿流体矿床成矿系列;优势矿床成矿系列类型是前陆盆地叠加后碰撞矿床成矿系列类型和岩浆弧叠加后碰撞矿床成矿系列类型。

关键词: 矿床成矿系列, 成矿多样性, 成矿广度, 成矿强度, 优势矿床成矿系列, 优势矿床成矿系列类型

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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