滇东北会泽超大型铅锌矿床矿质来源与改造成矿作用

发布时间：2018-05-18 00:13

本文选题：改造成矿作用 + 会泽超大型铅锌矿床　；参考：《高校地质学报》2017年04期

【摘要】："改造成矿作用"理论是中国科学院涂光炽院士提出的完善矿床成因分类学"四分法"的新理论,是中国学者对世界地球科学的重要贡献。该文根据会泽铅-锌(银、锗)矿床地质地球化学特征,列举其沉积改造的充分证据,用改造成矿的四大要素审视其矿床成因,认同它是典型而独特的沉积—强烈改造矿床,并以重要的宏观地质为依据,注意到峨眉山玄武岩(260 Ma)本身及昆阳群褶皱基底均未赋存一定规模的铅锌矿床,认为玄武岩与基底供给会泽铅锌矿(245~246 Ma)成矿物质有限,成岩与成矿时差太大,且成矿断层切割玄武岩,说明玄武岩成岩在先,铅、锌成矿在后,二者无直接成因联系。对会泽铅锌矿床的物质来源,有主张来自地层、基底、玄武岩或多来源者,但以何者为主,多种金属是否同源尚缺深入讨论,文章特别对地层、基底、峨眉山玄武岩中各成矿元素的含量、富集系数及富集类型进行系统的求算与分析研究,以讨论各种成矿金属的可能来源几率及其对成矿的贡献估计。结果显示:银在各地质体中均高倍富集,可提供充沛矿质,铅次之;锌则相反,多为正常元素或亏损元素,锗、镓、铟亦然,故矿石中的锌、锗、镓、铟,更可能为深部提供。结合大量的微量元素、稀土元素、铅、硫、锶、碳、氢、氧同位素等地球化学资料分析研究,认为地层,特别是震旦—寒武系、泥盆系、下石炭统摆佐组(C1b)与深部是主要的矿质来源,不同金属可同源或异源。矿床受地层岩性与构造的双重控制,与岩浆活动无关,具备改造成矿要素,属典型的沉积—强烈改造铅锌矿床,且具超大、特富、多金属富集的独特性。海西期下石炭统摆佐组已沉积成岩成矿或形成矿源层,后经印支期构造运动强烈改造而超常富集成矿,多掩盖其沉积特征,它属于沉积改造矿床"会泽式"。
[Abstract]:The theory of "reformed mineralization" is a new theory proposed by academician Tu Guangchi of the Chinese Academy of Sciences to perfect the "quaternion" method of ore deposit genetic taxonomy. It is also an important contribution of Chinese scholars to the world earth science. Based on the geological and geochemical characteristics of the Huize lead-zinc (silver, germanium) deposit, this paper enumerates the sufficient evidence of its sedimentary transformation, examines the genesis of the deposit with the four major elements of the reformed ore formation, and agrees that it is a typical and unique deposition-intensive reformed deposit. On the basis of the important macroscopic geology, it is noted that there are no Pb-Zn deposits of a certain scale in the Emeishan basalt (260 Maa) and in the folded basement of the Kunyang Group. It is considered that the basalt and basement supply the Huize Pb-Zn ore deposit with a limited amount of mineral-forming materials. The difference between diagenesis and metallogenic time is too big, and the ore-forming fault cuts basalt, indicating that basalt diagenesis is first, lead and zinc mineralization are later, and there is no direct genetic relationship between them. The material sources of the Huize Pb-Zn deposit are advocated from strata, basement, basalt or multi-source, but what is the main source, and whether many kinds of metals are homologous is still discussed in depth. The contents, enrichment coefficients and enrichment types of metallogenic elements in Emeishan basalt are calculated and analyzed systematically in order to discuss the possible source probability of various metallogenic metals and their contribution to metallogenic estimation. The results show that silver is highly enriched in various plastids and can provide abundant minerals, followed by lead, whereas zinc is mostly normal elements or depleted elements, germanium, gallium and indium, so the zinc, germanium, gallium and indium in ore are more likely to be provided in the deep. Combining with a large number of geochemical data such as trace elements, rare earth elements, lead, sulfur, strontium, carbon, hydrogen and oxygen isotopes, it is concluded that the strata, especially the Sinian Cambrian, Devonian, etc. The lower Carboniferous Chingzuo formation C _ 1b) and the depth are the main sources of minerals, different metals can be homologous or heterogenetic. The deposit is controlled by stratigraphic lithology and tectonics and has nothing to do with magmatic activity. It is a typical deposition-strongly reformed lead-zinc deposit, and has the unique characteristics of super-large, super-rich and polymetallic enrichment. The Lower Carboniferous Bendao formation in the Hercynian period has been depositional and diagenetic or has formed ore-source beds, and has been enriched and enriched by the Indosinian tectonic movement, covering up its sedimentary characteristics, which belongs to the "Huize type" of sedimentary reformation deposits.
【作者单位】：昆明理工大学国土资源工程学院;
【基金】：国家自然科学基金(41102049) 西南地区层控型多金属矿床成矿规律总结研究(20089943)联合资助
【分类号】：P618.42;P618.43

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