本文選題：維拉斯托 + 錫多金屬礦��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2016年碩士論文

【摘要】：大興安嶺西坡是我國(guó)重要的銀銅鉛鋅多金屬成礦帶。2014年在維拉斯托銀銅鉛鋅多金屬礦床外圍與深部發(fā)現(xiàn)錫礦化,目前已探明錫金屬資源量8.37萬(wàn)噸(332+333),規(guī)模達(dá)大型,取得了大興安嶺西坡尋找錫礦的重大找礦突破。本文選取維拉斯托錫多金屬礦床為研究對(duì)象,在加強(qiáng)礦區(qū)地質(zhì)、礦體特征分析的基礎(chǔ)上,綜合應(yīng)用巖石學(xué)、礦相學(xué)、巖礦地球化學(xué)、同位素年代學(xué)、流體包裹體等測(cè)試分析技術(shù),開(kāi)展了維拉斯托錫多金屬礦床地質(zhì)地球化學(xué)特征與礦床成因研究。論文取得的主要成果和認(rèn)識(shí)如下:1、在對(duì)維拉斯托錫多金屬礦床礦體特征、礦石類型、礦物穿插關(guān)系等進(jìn)行詳細(xì)的野外觀察基礎(chǔ)上,結(jié)合室內(nèi)巖石學(xué)、礦相學(xué)及顯微電子探針觀測(cè),將維拉斯托錫多金屬礦床劃分為3個(gè)成礦期次、6個(gè)成礦階段。2、維拉斯托錫多金屬礦床的巖石地球化學(xué)特征表明,與成礦有關(guān)的石英斑巖具有富硅、富堿、高鉀、貧鈣、過(guò)鋁質(zhì),高分異的特征,演化程度高,屬于高鉀鈣堿性系列,具堿長(zhǎng)花崗巖的典型特征;巖石中強(qiáng)烈虧損Ba、Sr、Ti、P,富集Rb與La、Ce、Pr、Nd、Sm及Th、U;稀土元素分布型式呈 V‖型,強(qiáng)烈的Eu負(fù)異常。其中,與成礦有關(guān)的天河石化石英斑巖LA-ICP-MS鋯石U-Pb加權(quán)平均年齡為136.25±0.68Ma;礦石中輝鉬礦的Re-Os同位素等時(shí)線年齡為116.6±1.8Ma。礦床的成巖成礦時(shí)代為早白堊世。3、維拉斯托錫多金屬礦床中的流體包裹體主要以氣液兩相包裹體為主,主成礦期完全均一溫度為220~321℃。初始成礦流體為高溫、中-低鹽度、富揮發(fā)分的H2O-NaCl體系,成礦早、中階段為中-高溫、中-低鹽度的H2O-NaCl體系,成礦晚階段則為低溫、中低鹽度的H2O-NaCl體系。初步確定維拉斯托錫多金屬礦床為中—高溫巖漿熱液礦床。
[Abstract]:The west slope of the Daxinganling Mountains is an important silver-copper-lead-zinc polymetallic metallogenic belt in China. Tin mineralization was discovered in the periphery and deep of the Silver-Cu-Pb-Zn polymetallic deposit in Virasto in 2014. At present, 83700 tons of tin metal resources have been discovered, with a large scale. A great breakthrough has been made in the exploration of tin ore on the west slope of Daxing'anling Mountains. In this paper, based on the analysis of geological and orebody characteristics, petrology, mineralogy, geochemistry and isotopic chronology are comprehensively applied. The geological and geochemical characteristics and genesis of the Villastosi _ polymetallic deposit were studied by fluid inclusion test and analysis techniques. The main achievements and understandings in this paper are as follows: 1. On the basis of detailed field observation of orebody characteristics, ore types, mineral intercalation relationships and so on, the paper combines indoor petrology. According to the metallographic and microelectronic probe observations, the Vila Stosid metal deposit is divided into 3 metallogenic stages and 6 metallogenic stages. The petrogeochemical characteristics of the Villastosi polymetallic deposit indicate that the ore-forming quartz porphyry is silicon-rich, and the ore-forming quartz-porphyry is rich in silicon. Rich in alkali, high potassium, poor calcium, peraluminous, high grade, high degree of evolution, belonging to high potassium calc-alkaline series, with typical characteristics of alkali feldspar granite; strongly depleted Bazrsrsrhinophosphate in rocks, enriched RB and Laxie PrNdSm and Thu U; REE distribution pattern is V type. Strong negative EU anomalies. Among them, the U-Pb weighted mean zircon U-Pb age of the quartz porphyry LA-ICP-MS is 136.25 鹵0.68 Ma, and the Re-Os isochron age of molybdenum in the ore is 116.6 鹵1.8 Ma. The diagenetic and metallogenic epoch of the deposit is early Cretaceous. 3. The fluid inclusions are mainly gas-liquid two-phase inclusions, and the homogenization temperature of the main metallogenic period is 220 ~ 321 鈩，

本文編號(hào)：1984178