滇西澜沧老厂Ag-Pb-Zn多金属矿床蚀变岩岩石学特征
发布时间：2018-07-17 17:53
【摘要】：滇西澜沧老厂银铅锌多金属矿床是“三江”成矿带南段最具代表性的多金属硫化物矿床之一,其成矿作用主要经历了早石炭世火山喷流沉积成矿与喜山期隐伏花岗斑岩侵位成矿,具有多因复成和同位成矿的特征。矿区围岩蚀变强烈,类型多样、复杂,可分为与火山喷流作用有关的热液蚀变系统和与隐伏花岗斑岩岩浆期后热液有关的蚀变系统。本文主要通过野外观察、坑道及钻孔的编录、样品的采集、光薄片的镜下鉴定、电子探针分析以及典型样品元素质量迁移平衡的研究后,对1480中段及ZK915与隐伏花岗斑岩有关的蚀变岩进行研究,得到以下认识：(1)老厂矿区蚀变分带在水平方向和纵向上均具有一定的规律性：①水平方向从岩体至围岩,其蚀变类型依次为黄铁绢英岩—矽卡岩—青磐岩；②纵向上从岩体至围岩,其蚀变类型依次为：黄铁绢英岩—矽卡岩—青磐岩。(2)在靠近黄铁绢英岩一侧,矽卡岩颜色表现出红棕色,而远离黄铁绢英岩,其颜色则过渡为灰绿色；从手标本及镜下观察可知,矽卡岩被多期含矿石英脉穿插,显示出矽卡岩形成于成矿的早期阶段。(3)矽卡岩化带蚀变矿物组合主要为硅灰石+石榴石+透辉石；其中石榴石为钙铝榴石-钙铁榴石系列,但以钙铝榴石为主；辉石为透辉石和钙铁辉石系列,但主要以透辉石为主。Wol+Hd+Ga组合显示出矿区矽卡岩是在高温还原条件下形成的；青磐岩化带蚀变矿物组合主要为黄铁矿+绢云母+绿泥石,局部含具环带构造的钙铁榴石；黄铁绢英岩化带蚀变矿物组合主要为黄铁矿+绢云母+石英,局部含具钠长石聚片双晶的拉长石颗粒。(4)隐伏花岗斑岩体(脉)和下石炭统依柳组(C1y)火山岩的存在为矿区黄铁绢英岩和矽卡岩、青磐岩的存在提供了物质基础；黄铁绢英岩的分布同时也指示了深部隐伏花岗斑岩的侵入空间,这对寻找与斑岩有关的矿床提供了找矿思路与方向。(5)通过对黄铁绢英岩化带(P-S-Q)、石榴石透辉石矽卡岩化带(G-A-D)、黄铁矿化绢云母绿泥石青磐岩化带(P-S-C)中元素质量迁移平衡的研究后发现：Fe2O3、CaO在每个蚀变带中都表现出带入,Cu、Ni、Cr、Co主要富集在绢英岩化带中,Mo、Zn主要富集于矽卡岩化带中,Sr、Ba、Nb主要富集于青磐岩化带中。通过对蚀变岩元素质量迁移特征研究,对我们寻找特定矿种及隐伏斑岩体的侵位空间具有重要的指示意义。
[Abstract]:Lancang Laochang silver-lead-zinc polymetallic deposit is one of the most representative polymetallic sulfide deposits in the southern section of the "Sanjiang" metallogenic belt. Its metallogenesis mainly experienced the early Carboniferous volcanic exhalation deposit mineralization and the Himalayan concealed granitic porphyry emplacement metallogeny with the characteristics of polygenetic complex and isomorphic mineralization. The alteration of the surrounding rock is strong, diverse and complex, which can be divided into hydrothermal alteration system related to volcanic exhalation and hydrothermal alteration system related to the post-magmatic period of concealed granitic porphyry. After field observation, cataloguing of tunnels and boreholes, collection of samples, microscopic identification of light slices, electron probe analysis and the balance of mass migration of elements in typical samples, The alteration rocks related to the concealed granitic porphyry in the middle section of 1480 and ZK915 are studied. The results are as follows: (1) the alteration zones in Laochang mining area have certain regularity from rock mass to surrounding rock in horizontal direction and longitudinal direction. The alteration types are: yellow sericite, skarn and Qingpan rock, from the rock body to the surrounding rock, and the alteration types are: yellow sericite, skarn and Qingwaki rock. (2) near the side of the yellow sericite, the alteration type of the alteration type is as follows: yellow sericite, skarn and Qingwaki rock. (2) near the side of the yellow sericite, Skarn shows reddish brown color, but far away from yellow sericite, its color transition is gray-green. From hand specimen and microscopic observation, skarn is interlaced by multi-stage ore-bearing veins. It is shown that skarn was formed in the early stage of mineralization. (3) the altered mineral assemblage of skarn zone is mainly wollastonite garnet diopside, in which garnet is a series of calcium aluminite and calcium ferrite, but mainly of calcium allogite. The pyroxene is a series of diopside and calciferopyroxene, but mainly diopside. Wol Hd Ga assemblage shows that skarn in the ore area was formed under the condition of high temperature reduction, and the altered mineral assemblage of Qingwanglianlizhuan zone is mainly pyrite sericite chlorite. The alteration mineral assemblage of pyrite sericite quartz is the main alteration mineral assemblage of pyrite sericite quartz. (4) the existence of concealed granitic porphyry bodies (veins) and lower Carboniferous Yiliu formation (C1y) volcanic rocks provide a material basis for the existence of pyrolite and skarn in the mining area. The distribution of yellow sericite also indicates the intrusive space of deep concealed granitic porphyry. This provides an idea and direction for prospecting for porphyry related deposits. (5) the mass migration level of elements in the P-S-Q, G-A-D and P-S-C of the pyrite sericite pallitization zone (P-S-C) is obtained. It is found that in each alteration zone, the% Fe _ 2O _ 3CaO _ 2O _ 3 Cao is mainly enriched in the sericite zone, mainly in the sericite zone, and mainly in the skarn belt, where the Sr _ (+) _ (B) _ (+) Ba _ (Nb) _ (b) is mainly enriched in the Qingiranlitization zone. By studying the characteristics of mass migration of altered rock elements, it is of great significance for us to search for the emplacement space of specific ore types and concealed porphyry bodies.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2
本文编号：2130467
[Abstract]:Lancang Laochang silver-lead-zinc polymetallic deposit is one of the most representative polymetallic sulfide deposits in the southern section of the "Sanjiang" metallogenic belt. Its metallogenesis mainly experienced the early Carboniferous volcanic exhalation deposit mineralization and the Himalayan concealed granitic porphyry emplacement metallogeny with the characteristics of polygenetic complex and isomorphic mineralization. The alteration of the surrounding rock is strong, diverse and complex, which can be divided into hydrothermal alteration system related to volcanic exhalation and hydrothermal alteration system related to the post-magmatic period of concealed granitic porphyry. After field observation, cataloguing of tunnels and boreholes, collection of samples, microscopic identification of light slices, electron probe analysis and the balance of mass migration of elements in typical samples, The alteration rocks related to the concealed granitic porphyry in the middle section of 1480 and ZK915 are studied. The results are as follows: (1) the alteration zones in Laochang mining area have certain regularity from rock mass to surrounding rock in horizontal direction and longitudinal direction. The alteration types are: yellow sericite, skarn and Qingpan rock, from the rock body to the surrounding rock, and the alteration types are: yellow sericite, skarn and Qingwaki rock. (2) near the side of the yellow sericite, the alteration type of the alteration type is as follows: yellow sericite, skarn and Qingwaki rock. (2) near the side of the yellow sericite, Skarn shows reddish brown color, but far away from yellow sericite, its color transition is gray-green. From hand specimen and microscopic observation, skarn is interlaced by multi-stage ore-bearing veins. It is shown that skarn was formed in the early stage of mineralization. (3) the altered mineral assemblage of skarn zone is mainly wollastonite garnet diopside, in which garnet is a series of calcium aluminite and calcium ferrite, but mainly of calcium allogite. The pyroxene is a series of diopside and calciferopyroxene, but mainly diopside. Wol Hd Ga assemblage shows that skarn in the ore area was formed under the condition of high temperature reduction, and the altered mineral assemblage of Qingwanglianlizhuan zone is mainly pyrite sericite chlorite. The alteration mineral assemblage of pyrite sericite quartz is the main alteration mineral assemblage of pyrite sericite quartz. (4) the existence of concealed granitic porphyry bodies (veins) and lower Carboniferous Yiliu formation (C1y) volcanic rocks provide a material basis for the existence of pyrolite and skarn in the mining area. The distribution of yellow sericite also indicates the intrusive space of deep concealed granitic porphyry. This provides an idea and direction for prospecting for porphyry related deposits. (5) the mass migration level of elements in the P-S-Q, G-A-D and P-S-C of the pyrite sericite pallitization zone (P-S-C) is obtained. It is found that in each alteration zone, the% Fe _ 2O _ 3CaO _ 2O _ 3 Cao is mainly enriched in the sericite zone, mainly in the sericite zone, and mainly in the skarn belt, where the Sr _ (+) _ (B) _ (+) Ba _ (Nb) _ (b) is mainly enriched in the Qingiranlitization zone. By studying the characteristics of mass migration of altered rock elements, it is of great significance for us to search for the emplacement space of specific ore types and concealed porphyry bodies.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2
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