云南会泽超大型铅锌矿床分散元素富集规律

发布时间：2018-02-16 19:22

本文关键词： 分散元素会泽铅锌矿类质同象富集　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：“分散元素”是指在自然界含量低(一般为10-9~10-6级),以分散状态存在,很少形成独立矿物的一组元素,主要包括锗、镉、镓、铟、铊、硒、碲、铼八种。分散元素在国民经济建设的各个领域的用途广泛且具有战略意义。会泽铅锌矿不仅铅锌品位特富,而且富含多种分散元素。会泽铅锌矿位于扬子地台西南缘川滇黔多金属成矿域中南部,区域上受小江深断裂带和昭通-曲靖隐伏断裂带控制,局部受矿山厂断裂、麒麟厂断裂和银厂坡断裂控制。矿体主要赋存于下石炭统摆佐组中,以脉状、囊状、扁柱状、网脉状及“似层状”产出。矿物主要呈粒状结构,矿石呈块状构造。利用矿物自动分析仪(Mineral Liberation Analyser,简称MLA)对会泽铅锌矿矿物分析发现,主要硫化矿物为闪锌矿、方铅矿、黄铁矿,氧化矿物为白铅矿、菱锌矿、异极矿;主要脉石矿物为白云石,另有少量细硫砷铅矿、硫锑铅矿、重晶石、镁绿泥石。未发现分散元素独立矿物,它们主要以类质同象存在于矿物中。对会泽铅锌矿矿物EMPA、ICP-MS、LA-ICP-MS分析发现,会泽铅锌矿富含Cd、Ge、Se、Te、In、Tl等多种分散元素,其中闪锌矿中富集Cd、Ge、Se、Te、In、Tl,且Cd、Ge已经达到工业品位,可以综合利用;方铅矿中Se达到工业品位,可以综合利用;会泽铅锌矿没有Ga的富集。闪锌矿中Fe、Cd、Ge主要以类质同象替代Zn进入闪锌矿晶格,产生Cd、Ge的富集;Se主要替代S进入闪锌矿发生富集。其它分散元素主要通过相互间的替换进入闪锌矿,如成矿过程中Te与Cd、Fe相互置换,In与S、Fe、Se相互置换,Tl与Fe、Cd相互置换。另外两组元素In、Te与Zn、Ge、Ga、Se之间存在互相置换的关系,它们很可能类质同象取代Pb进入方铅矿,Se取代S进入方铅矿。闪锌矿中Fe、Cd、Ge、Co、Mo含量随颜色加深而增加,Se、Tl含量与颜色没有明显相关性。
[Abstract]:"dispersed element" refers to a group of elements that are low in nature (generally 10-9 ~ 10-6) and are dispersed and rarely form independent minerals, including mainly germanium, cadmium, gallium, indium, thallium, selenium, tellurium, Eight kinds of rhenium. Dispersed elements are widely used in various fields of national economic construction and have strategic significance. Huize lead-zinc ore is not only very rich in lead and zinc grade, The Huize lead-zinc deposit is located in the central and southern part of the Sichuan, Yunnan and Guizhou polymetallic metallogenic fields on the southwest margin of the Yangtze platform, and is controlled by the Xiaojiang deep fault zone and the Zhaotong Qujing concealed fault zone, and partly by the mine factory fault. Controlled by Kirinchang fault and Yinchangpo fault, the orebody mainly occurs in the Lower Carboniferous Yaozuo formation, occurring in vein, cystic, flat columnar, reticulated and "laminoid". The minerals are mainly granular in structure. The minerals of Huize lead-zinc ore are mainly sulphide minerals such as sphalerite, galena, pyrite, oxidized minerals such as white lead, smithsonite and heteropolar ore. The main gangue mineral is dolomite, and there are a few fine sulfur arsenite, antimony lead, barite, magnesium chlorite. There are no independent minerals of dispersed elements, which mainly exist in minerals as homologues. The EMPAICP-MSLA-ICP-MS analysis of Huize lead-zinc ore mineral shows that the main gangue minerals are fine arsenite, antimony lead ore, barite and magnesium chlorite. The Huize lead-zinc deposit is rich in various dispersed elements, such as CD ~ ((2 +)) _ (()) ~ (((1)) ~ ((1)), etc., among which the sphalerite is rich in CD ~ (2 +) ~ (2 +) ~ ((1)), and CD ~ (2 +) Ge has reached the industrial grade and can be comprehensively utilized, and the se in galena is of industrial grade and can be comprehensively utilized. There is no enrichment of Ga in Huize lead-zinc deposit. In sphalerite, Fe _ (2 +) CD ~ (2 +) GE is mainly substituted for Zn in sphalerite lattice. The enrichment of CD ~ (2 +) GE ~ (3 +) mainly replaces S and enters sphalerite, and other dispersed elements enter sphalerite mainly by replacing each other. For example, in the process of metallogenic process, Te and CdCd-Fe are replaced with each other. There is a relationship of substitution between the other two groups of elements, Intete and ZnGE-Ga-Ga-se, and the substitution of T _ l and Fe ~ (2 +) ~ (2 +) ~ (2 +) ~ (2 +) ~ (-1) ~ (-1) ~ (-1). It is very likely that the metamorphic Pb is substituted for Pb into the galena and se replaces S to enter the galena. There is no obvious correlation between the content of Fe ~ (2 +) CD ~ (2 +) ~ ((1)) _ (1) and the color of the sphalerite with the increasing of the color of the sphalerite.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.4

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