【摘要】：滇西瀾滄老廠銀鉛鋅多金屬礦床是“三江”成礦帶南段最具代表性的多金屬硫化物礦床之一,其成礦作用主要經(jīng)歷了早石炭世火山噴流沉積成礦與喜山期隱伏花崗斑巖侵位成礦,具有多因復(fù)成和同位成礦的特征。礦區(qū)圍巖蝕變強(qiáng)烈,類型多樣、復(fù)雜,可分為與火山噴流作用有關(guān)的熱液蝕變系統(tǒng)和與隱伏花崗斑巖巖漿期后熱液有關(guān)的蝕變系統(tǒng)。本文主要通過野外觀察、坑道及鉆孔的編錄、樣品的采集、光薄片的鏡下鑒定、電子探針分析以及典型樣品元素質(zhì)量遷移平衡的研究后,對1480中段及ZK915與隱伏花崗斑巖有關(guān)的蝕變巖進(jìn)行研究,得到以下認(rèn)識：(1)老廠礦區(qū)蝕變分帶在水平方向和縱向上均具有一定的規(guī)律性：①水平方向從巖體至圍巖,其蝕變類型依次為黃鐵絹英巖—矽卡巖—青磐巖；②縱向上從巖體至圍巖,其蝕變類型依次為：黃鐵絹英巖—矽卡巖—青磐巖。(2)在靠近黃鐵絹英巖一側(cè),矽卡巖顏色表現(xiàn)出紅棕色,而遠(yuǎn)離黃鐵絹英巖,其顏色則過渡為灰綠色；從手標(biāo)本及鏡下觀察可知,矽卡巖被多期含礦石英脈穿插,顯示出矽卡巖形成于成礦的早期階段。(3)矽卡巖化帶蝕變礦物組合主要為硅灰石+石榴石+透輝石；其中石榴石為鈣鋁榴石-鈣鐵榴石系列,但以鈣鋁榴石為主；輝石為透輝石和鈣鐵輝石系列,但主要以透輝石為主。Wol+Hd+Ga組合顯示出礦區(qū)矽卡巖是在高溫還原條件下形成的；青磐巖化帶蝕變礦物組合主要為黃鐵礦+絹云母+綠泥石,局部含具環(huán)帶構(gòu)造的鈣鐵榴石；黃鐵絹英巖化帶蝕變礦物組合主要為黃鐵礦+絹云母+石英,局部含具鈉長石聚片雙晶的拉長石顆粒。(4)隱伏花崗斑巖體(脈)和下石炭統(tǒng)依柳組(C1y)火山巖的存在為礦區(qū)黃鐵絹英巖和矽卡巖、青磐巖的存在提供了物質(zhì)基礎(chǔ)；黃鐵絹英巖的分布同時也指示了深部隱伏花崗斑巖的侵入空間,這對尋找與斑巖有關(guān)的礦床提供了找礦思路與方向。(5)通過對黃鐵絹英巖化帶(P-S-Q)、石榴石透輝石矽卡巖化帶(G-A-D)、黃鐵礦化絹云母綠泥石青磐巖化帶(P-S-C)中元素質(zhì)量遷移平衡的研究后發(fā)現(xiàn)：Fe2O3、CaO在每個蝕變帶中都表現(xiàn)出帶入,Cu、Ni、Cr、Co主要富集在絹英巖化帶中,Mo、Zn主要富集于矽卡巖化帶中,Sr、Ba、Nb主要富集于青磐巖化帶中。通過對蝕變巖元素質(zhì)量遷移特征研究,對我們尋找特定礦種及隱伏斑巖體的侵位空間具有重要的指示意義。
[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.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 歐陽成甫,徐楚明;云南瀾滄老廠地洼型銀鉛礦床的地球化學(xué)特征及成因[J];大地構(gòu)造與成礦學(xué);1991年04期

2 肖成東,劉學(xué)武;東蒙地區(qū)夕卡巖石榴石稀土元素地球化學(xué)及其成因[J];中國地質(zhì);2002年03期

3 豐成友;趙一鳴;李大新;劉建楠;肖曄;李國臣;馬圣鈔;;青海西部祁漫塔格地區(qū)矽卡巖型鐵銅多金屬礦床的矽卡巖類型和礦物學(xué)特征[J];地質(zhì)學(xué)報;2011年07期

4 徐楚明,歐陽成甫;云南瀾滄老廠銀鉛鋅礦床成因研究[J];桂林冶金地質(zhì)學(xué)院學(xué)報;1991年03期

5 楊開輝;侯增謙;莫宣學(xué);;“三江”地區(qū)火山成因塊狀硫化物礦床的基本特征與主要類型[J];礦床地質(zhì);1992年01期

6 鄧海琳,涂光熾,李朝陽,劉叢強(qiáng);地球化學(xué)開放系統(tǒng)的質(zhì)量平衡:1.理論[J];礦物學(xué)報;1999年02期

7 龍漢生;蔣紹平;石增龍;黃智龍;羅泰義;;云南瀾滄老廠大型銀鉛鋅多金屬礦床地質(zhì)地球化學(xué)特征[J];礦物學(xué)報;2007年Z1期

8 林新多 ,許國建;巖漿成因矽卡巖的某些特征及形成機(jī)制初探[J];現(xiàn)代地質(zhì);1989年03期

9 薛步高;;對瀾滄老廠鉛鋅礦成因的討論[J];云南地質(zhì);1989年02期

相關(guān)碩士學(xué)位論文 前3條

1 艾金彪;斑巖型礦床元素質(zhì)量遷移定量探討[D];中國地質(zhì)科學(xué)院;2013年

2 陳偉;西藏甲瑪、努日銅多金屬礦床矽卡巖礦物學(xué)特征對比研究[D];成都理工大學(xué);2013年

3 于淼;青海尕林格鐵礦矽卡巖礦物學(xué)及礦化蝕變分帶特征研究[D];中國地質(zhì)大學(xué)（北京）;2013年

，

本文編號：2130467