文章摘要
程涌,文义明.黔东下寒武统渣拉沟组黑色岩系金属元素成矿潜力及富集机制分析[J].矿产勘查,2025,(1):44-54
黔东下寒武统渣拉沟组黑色岩系金属元素成矿潜力及富集机制分析
Metallogenetic potential and enrichment mechanism of metallic elements in black rock series of Lower Cambrian Zhalagou Formation, eastern Guizhou
投稿时间：2023-01-03  
DOI：10.20008/j.kckc.202501005
中文关键词: 下寒武统  黑色岩系  微量元素  渣拉沟组  成矿潜力  成矿物质来源
英文关键词: Lower Cambrian  black rock series  trace elements  Zhalagou Formation  metallogenic potential  ore-forming material source
基金项目:
作者单位
程涌 昆明冶金高等专科学校冶金与矿业学院，云南昆明 650033
昆明理工大学国土资源工程学院，云南昆明 650093 
文义明 昆明冶金高等专科学校冶金与矿业学院，云南昆明 650033
昆明理工大学国土资源工程学院，云南昆明 650093 
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中文摘要:
      黔东渣拉沟组(.1z)黑色页岩广泛分布，是中国南方下寒武统黑色岩系多金属成矿带的重要组成部分，具有较大的成矿潜力。本文研究了三都渣拉沟组下部黑色炭质页岩的微量元素组成，并对微量元素的富集特征、成矿潜力和异常元素的来源进行了探讨。结果表明，渣拉沟组黑色炭质页岩各微量元素含量基本属正态分布，具有对称、正偏、负偏和双峰 4种分布类型。相比于扬子上地壳背景值，渣拉沟组黑色炭质页岩中元素 Ba、Mo、Cu、Ni、Rb、Sn、Cs、Pb、Tl和 U强烈富集；元素 Zn后期叠加作用强烈；元素 Zn、Sr、Ba、Cu、 Ni和 Co具有较强的变异性。综合分析认为 Ba是渣拉沟组黑色岩系中最具潜力的矿种，其次为 Ni、B、Tl、 Cs、U、Sn、Pb、Rb、Th和 Cu。这些异常元素原始数据和经正态转换数据的聚类分析谱系图对比表明，元素 Ba、Sr、Rb和 Zn受到了初始沉积作用以外的其他地质作用的强烈叠加改造。相比于平均页岩，元素 Ba和 Mo均高度富集，元素 Pb和 U总体略微富集，元素 Cu和 Zn部分富集。结合前人的研究工作认为，Mo主要来源于海水，而 Ba少部分来自生物富集外，其主要部分来自热液活动的叠加改造；Cu、Pb和 Zn的富集与热水作用有关；U的富集除了与热水作用有关，还与还原性环境及大量有机质的络合作用有关；B、Co、Ni、 Sn、Cs、Tl为正常页岩形成的初始元素信息，只不过其在细粒沉积岩中的含量普遍高于上地壳背景值。本研究有助于探讨黔东下寒武统渣拉沟组黑色岩系成矿规律。
英文摘要:
      The black shale of the Zhalagou Formation (.1z) is widely distributed in eastern Guizhou, which is animportant part of the Lower Cambrian black rock series polymetallicmetallogenic belt in southern China and hasgreat metallogenic potential. In this paper, the composition of trace elements in the lower black carbonaceous shaleof Zhalagou Formation in Sandu is studied, and the enrichment characteristics of trace elements, metallogenic poten.tial and the source of abnormal elements are discussed. The results show that the contents of trace elements in the black carbonaceous shale of the Zhalagou Formation basically belong to the normal distribution, which has fourtypes of distribution: symmetrical, positively skewed, negatively skewed and bimodal. The elements Ba, Mo, Cu, Ni,Rb, Sn, Cs, Pb, Tl and U are strongly enriched compared with the background values of the Yangtze upper crust.The element Zn in the black shale has strong superposition effect in the late stage. Elements Zn, Sr, Ba, Cu, Ni andCo are highly variable. Comprehensive analysis shows that Ba is the most potential mineral in this black rock series,followed by Ni, B, Tl, Cs, U, Sn, Pb, Rb, Th and Cu. The comparison between the original data of these abnormal ele.ments and the normal transformed data by cluster analysis shows that the elements Ba, Sr, Rb and Zn were stronglysuperimposed by other geological processes besides the initial sedimentation. Compared to the average shale, ele.ments Ba and Mo are both highly enriched, elements Pb and U are slightly enriched overall, and elements Cu andZn are partially enriched. In combination with previous studies, Mo was mainly derived from seawater, while Ba wasmainly derived from the superposition of hydrothermal activity except for a small part of biological enrichment. Theenrichment of Cu, Pb and Zn was related to hydrothermal interaction. In addition to hot water, the enrichment of Uwas also related to the reducing environment and the complexation of a large amount of organic matter. B, Co, Ni,Sn, Cs and Tl were the initial element information of normal shale formation, but their contents in fine-grained sedi.mentary rocks were generally higher than the background value of the upper crust.This study is helpful to explorethe metallogenic regularity of the black rock series of the the Lower Cambrian Zhalagou Formation in eastern Gui.zhou.
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