ACCUMULATION AND EVOLUTION OF ORE-FORMING COMPOSITION OF GOLD DEPOSITS IN THE WESTERN SHANDONG UPLIFT TERRAIN
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摘要: 在地质研究的基础上, 以统计分析为主要手段, 通过对鲁西隆起区太古宙地层、中生代岩体以及不同时代金矿床化学组成的研究, 探索了成矿组分的可能来源、演化和聚集趋势, 提出了矿源层(岩) 中元素成矿活度的概念及定量计算方法.研究表明: (1) 在鲁西隆起区, 金的初始矿源是太古宙绿岩带, 金在其中具有双成分分布; (2) 从太古宙至中生代, 虽然成矿时代不同, 成矿作用各异, 但各类金矿床在成矿组分上对含矿建造具有明显的继承性; (3) 含矿建造中成矿组分超量点群与其背景点群的比例以及超量点群中成矿组分的平均质量分数在很大程度上决定了其后生热液矿床的成矿特征.Abstract: This paper addresses the possible source, evolution and accumulation patterns of the ore-forming compositions, on the basis of the geological research, the statistical analysis, and the research into the Archean strata, the Mesozoic intrusive complexes and the chemical composition of gold deposits in different ages in the western Shandong uplift terrain. Then this paper suggests the concept of and the quantitative calculation method for the ore-forming activity of the elements in the mineralized source beds (rocks). The research shows the following three points: (1) In the western Shandong uplift terrain, the initial source of the gold is the Archean greenstone belts characterized by the bimodal gold distribution. (2) A conspicuous inheritance can be observed on the ore-bearing formation in terms of the mineralized compositions of different kinds of gold deposits despite of the different ages and different mineralizations from the Archean to the Mesozoic. (3) The characteristics of epigenetic hydrothermal deposits are determined to a great extent by the ratio between the excessive population of mineralized elements and its corresponding background population in the ore-bearing formation, and also by the average content of mineralized elements in the excessive population.
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图 1 鲁西隆起区区域地质矿产简图
ry.沂水岩群; Art.泰山岩群; TTG.前寒武纪变质深成杂岩; Pz.古生代沉积碳酸盐岩; Mz.中生代碎屑沉积岩.1.中生代侵入岩; 2.中生代火山岩盆地; 3.韧性剪切带; 4.断裂; 5.变质热液金矿床; 6.侵入岩型热液金矿床; 7.火山热液金矿床; 8.地名
Fig. 1. Regional outline map of gold mineral resources in the western Shandong uplift terrain
图 2 鲁西太古宙绿岩带金的配分对数累积概率分布
Fig. 2. Partitioned log probability plot of 216 Au values from Archean greenstone belts in the western Shandong uplift terrain
图 3 鲁西中生代侵入岩金的对数累积概率分布
Fig. 3. Partitioned log probability plot of 113 Au values of Mesozoic intrusive rocks in the western Shandong uplift terrain
图 4 鲁西金矿成矿组分成矿轨迹
Fig. 4. Ore-forming traces of Au ore-forming elements in the western Shandong uplift terrain
表 1 鲁西太古宙绿岩带金超量点群分布及金成矿活度
Table 1. The distribution of Au excess population and Au ore-foming activity of Archean greenstone belts in the western Shandong uplift terrain
表 2 鲁西太古宙绿岩带元素质量分数分布及浓集趋势
Table 2. Element average contents and concentration patterns of Archean greenstone belts in the western Shandong uplift terrain
表 3 鲁西中生代侵入岩元素平均质量分数及浓集序列
Table 3. Element average contents and concentration patterns of Mesozoic ore-forming intrusive rocks, the western Shandong uplift terrain
表 4 鲁西中生代侵入杂岩体组分正交因子载荷
Table 4. Orthogonal rotation factor loadings of element values of Mesozoic intrusive rocks, the western Shandong uplifted terrain
表 5 鲁西太古宙绿岩带-中生代侵入杂岩-金矿床元素平均质量分数及浓集趋势
Table 5. Element average contents and concentration pattern of Archean greenstone belts, Mesozoic intrusive rocks and gold deposits in the western Shandong uplift terrain
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