本文選題：VMS型礦床 + 含礦層位��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：四川省白玉縣呷村銀多金屬礦床是我國(guó)著名的VMS礦床之一,具有容礦火山巖系+硫化物礦體+噴氣巖的“三位一體”特征,以及下部筒狀或漏斗狀網(wǎng)脈狀礦(西礦帶)和上部層狀塊狀礦(東礦帶)的“雙層結(jié)構(gòu)”樣式。有熱礦區(qū)位于呷村礦床的南部,目前人們對(duì)于其是否與呷村礦床屬于同一含礦層、有熱礦區(qū)是否存在類似呷村東礦帶的以“黑礦”-重晶石組合為代表的隱伏銀銅鉛鋅塊狀礦體有很大爭(zhēng)議。本文以該礦床為研究對(duì)象,在詳細(xì)野外資料基礎(chǔ)上,結(jié)合室內(nèi)的鏡下觀察、圖件繪制等工作,對(duì)該呷村-有熱礦區(qū)的含礦層位、含礦帶精細(xì)結(jié)構(gòu)有系統(tǒng)的認(rèn)識(shí)。(1)詳細(xì)的地層對(duì)比研究表明:有熱礦區(qū)與呷村礦床含礦層位具有連續(xù)穩(wěn)定的頂?shù)讟?biāo)志層,以及下部中酸性、上部酸性的縱向巖性變化特征,表現(xiàn)為含礦層位底界出現(xiàn)流紋英安質(zhì)角礫-集塊巖,下部以一套流紋英安質(zhì)熔巖-火山碎屑巖為主,上部為一套流紋質(zhì)熔巖-火山碎屑巖,頂界均出現(xiàn)鈣質(zhì)碳質(zhì)板巖及上覆的安山巖,據(jù)此認(rèn)為呷村-有熱地區(qū)位于同一含礦層位中,有熱礦區(qū)是呷村礦床的自然南延部分。(2)呷村礦床和有熱礦區(qū)含礦帶精細(xì)結(jié)構(gòu)對(duì)比表明:有熱礦區(qū)北部19-31線由塊狀硅化流紋質(zhì)火山巖+條紋條帶狀流紋質(zhì)凝灰?guī)r+千枚狀絹云母凝灰?guī)r組成火山噴發(fā)單元,以強(qiáng)烈的硅化為特征,發(fā)育大量的脈狀-網(wǎng)脈狀構(gòu)造,與呷村西礦帶完全可以對(duì)比;而有熱南部39-55線則由塊狀“黃礦”礦石與流紋質(zhì)火山碎屑巖組成噴氣一火山單元,但缺乏重晶石、硅質(zhì)巖等噴氣沉積巖;以“黃礦”為主,僅形成鉛鋅貧礦體,與呷村礦床東礦帶富含重晶石、以“黑礦”為主,形成銀銅鉛鋅富礦體的特征有較大區(qū)別。同時(shí),有熱塊狀礦體上部還存在厚達(dá)70-130m的流紋質(zhì)火山巖和脈狀-網(wǎng)脈狀礦體,據(jù)此認(rèn)為有熱礦帶總體上可與呷村西礦帶對(duì)比,代表熱液噴流成礦系統(tǒng)的熱水補(bǔ)給通道相,其中的塊狀(黃礦)礦體具微“雙層”結(jié)構(gòu)特征,有可能為早期熱流成礦系統(tǒng)的另一個(gè)獨(dú)立的“微”VMS礦床。(3)有熱礦區(qū)已知礦體的東部可能存在類似呷村東礦帶的以“黑礦”-重晶石組合為代表的隱伏銀銅鉛鋅塊狀礦體,尋找此類礦體是有熱礦區(qū)今后取得找礦重大突破的關(guān)鍵所在。
[Abstract]:The Gacun silver-polymetallic deposit in Baiyu County, Sichuan Province, is one of the famous VMS deposits in China, which has the characteristics of "trinity" of sulphide exhalations of volcanic rock series. And the "double structure" pattern of the lower tubular or funnel-shaped reticulated vein ore (west ore belt) and the upper layered massive ore (east ore belt). The Youre mine is located in the southern part of the Gacun deposit. At present, people are concerned about whether it belongs to the same ore-bearing bed as the Gacun deposit. It is controversial whether there is a concealed silver-copper-lead-zinc block orebody similar to the Gacundong ore belt, represented by the "black ore" barite association. On the basis of detailed field data, combined with indoor observation and drawing work, the ore-bearing horizon of the Gacune-Youre mining area is studied in this paper. Detailed stratigraphic correlation study of fine structure of ore-bearing belt shows that the ore-bearing strata of Youre mine and Gacun deposit have continuous and stable top-to-bottom marker layers, as well as the longitudinal lithologic characteristics of intermediate acidity and upper acidity in the lower part of the ore-bearing zone. In the bottom boundary of ore-bearing strata, there are fluid-grain amphitic breccide-aggregates, a set of fluid-amphitic lava and pyroclastic rocks in the lower part, and a set of fluid-pyroclastic rocks in the upper part of the ore-bearing bed. Calcareous carbonaceous slate and overlying andesite appear in the top boundary, so it is considered that the Gacune-Youre area is located in the same ore-bearing bed. The fine structure comparison between the Gacun ore deposit and the ore-bearing belt of the ore-bearing area shows that the northern 19-31 line of the ore-bearing area is striped and striped by massive silicified streamline volcanic rocks. A thousand sericite tuff forms a volcanic eruption unit, Characterized by strong silicon, a large number of vein-net vein structures are developed, which can be completely contrasted with the Gacunxi ore belt, while the 39-55 line in the southern part of Youre is composed of massive "yellow ore" ores and fluid-grained pyroclastic rocks, which constitute the air-jet volcanic unit. However, it is lack of exhalative sedimentary rocks such as barite, siliceous rock and so on, mainly "yellow ore", only lead-zinc lean ore body is formed, which is different from "black ore" and rich barite in east ore belt of Gacun deposit, and the characteristics of silver copper-lead-zinc rich ore body are quite different from those in east ore belt of Gacun deposit. At the same time, there are also fluid-grain volcanic rocks and vein-net orebodies in the upper part of the hot block orebody. It is considered that the thermal ore belt can be compared with the Gacunxi ore belt on the whole and represents the hot water supply channel facies of hydrothermal exhalation ore-forming system. The massive (yellow ore) orebody is characterized by a micro-" double layer "structure. It is possible that another independent "micro" VMS deposit. 3) in the eastern part of the known orebody of the thermal ore area, there may be a concealed silver, lead-zinc block orebody, represented by the "black ore" barite association, similar to the Gacundong ore belt, which may be another independent "micro" VMS deposit. Finding such orebodies is the key to make a great breakthrough in prospecting in hot mining areas in the future.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.2

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本文編號(hào)：1918640