本文關(guān)鍵詞：會澤鉛鋅礦床深部礦化—蝕變巖相分帶規(guī)律及找礦預(yù)測　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 礦化-蝕變分帶 礦化-蝕變指數(shù) 找礦預(yù)測 會澤超大型鉛鋅礦床 滇東北礦集區(qū)

【摘要】：會澤超大型鉛鋅礦床在滇東北鉛鋅多金屬礦集區(qū)最具代表性�；趯υ摰V床成礦地質(zhì)特征研究,應(yīng)用大比例尺構(gòu)造-蝕變巖相學(xué)填圖方法,開展會澤鉛鋅礦床深部的礦化-蝕變分帶及其地球化學(xué)特征研究,建立礦化-蝕變分帶規(guī)律,并計算各帶礦化-蝕變指數(shù),結(jié)合構(gòu)造地球化學(xué)研究,進行找礦預(yù)測。論文主要取得如下成果和認識:1)該礦床受斷裂控制明顯,礦體主要賦存于擺佐組(C1b)粗晶白云巖內(nèi)的NE層間壓扭性斷裂帶內(nèi)。礦體兩側(cè)礦化-蝕變巖分帶明顯:隨著離礦體距離的減小,礦化-蝕變程度增強。無論是礦體還是與其密切共生的蝕變帶的展布均受到成礦期構(gòu)造的嚴格控制,說明了構(gòu)造-礦化-蝕變?nèi)叩拿芮嘘P(guān)系。2)礦床主要蝕變類型為白云石化、方解石化、黃鐵礦化、硅化等,礦化類型為閃鋅礦化和方鉛礦化。根據(jù)蝕變白云巖顏色、巖石組構(gòu)、巖石學(xué)特征、與礦體的空間位置關(guān)系、礦化-蝕變強度等,礦床深部礦化-蝕變分帶為:從圍巖到礦體,呈現(xiàn)灰白色粗晶白云巖帶(Ⅰ)→針孔狀白云巖帶(Ⅱ)→米黃色粗晶白云巖帶(Ⅲ)→灰白色粗晶礦化白云巖帶(Ⅳ)→鉛鋅礦化帶(V)的變化規(guī)律;自圍巖向礦體中心,白云石化、方解石化、黃鐵礦化呈現(xiàn)出由弱變強的變化規(guī)律。而且,外圍預(yù)測區(qū)的蝕變帶的數(shù)量則相對減少,各帶的蝕變程度較弱。3)應(yīng)用元素質(zhì)量平衡法計算各礦化-蝕變帶之間的組分遷移特征:TFe、CaO、MgO、Pb、Zn幾乎保持遷入富集狀態(tài)。應(yīng)用礦化-蝕變指數(shù)、遷入元素增長指數(shù)(Z)來研究礦化與蝕變的關(guān)系,礦化-蝕變指數(shù)(AI)、黃鐵礦化指數(shù)(AITFe)、方鉛礦化指數(shù)(AIPb)、閃鋅礦化指數(shù)(AIZa)以及遷入元素TFe、Pb和Zn的增長指數(shù)值,由遠礦到近礦逐漸增加,反映出鉛鋅礦化和黃鐵礦化逐漸增強,圍巖的白云石化指數(shù)(AIMgO)值比礦體高,反映出圍巖經(jīng)受過強烈的白云石化。各礦化-指數(shù)值的對比分析,發(fā)現(xiàn)各指數(shù)可以定量反映礦化帶的礦化分布規(guī)律,研究AI值與礦化-蝕變的關(guān)系具有重要的找礦意義;4)對礦化信息提取的礦化-蝕變指數(shù)、Pb和Zn單元素異常以及礦化元素組合異常與實際礦體位置一致。其中,礦化-蝕變指數(shù)AI50%可表示閃鋅礦化、方鉛礦化及黃鐵礦化。通過三種方法的對比研究,發(fā)現(xiàn)礦化-蝕變指數(shù)對于礦化信息的提取是可行的。結(jié)合礦床的地質(zhì)條件,在1584中段小菜園勘查區(qū)運用礦化-蝕變指數(shù)、Pb和Zn單元素異常及構(gòu)造地球化學(xué)異常進行找礦預(yù)測,得到3個找礦靶區(qū)。
[Abstract]:The Huize super large Pb-Zn deposit is the most representative of the Pb-Zn polymetallic deposit in northeastern Yunnan. Based on the study of the ore-forming geological characteristics of the deposit, a large scale tectonic-altered lithofacies mapping method is used. The mineralization-alteration zones and their geochemical characteristics in the depth of the Huize lead-zinc deposit are studied. The law of mineralization-alteration zones is established and the mineralization-alteration index of each zone is calculated, combined with the study of tectonic geochemistry. In this paper, the main achievements and understanding are as follows: (1) the ore deposit is obviously controlled by fault. The orebody is mainly located in the NE interlayer compression-torsional fault zone in the coarse dolomite of Chengzuo formation. The mineralization-altered rocks on both sides of the orebody are obviously zoned as the distance from the orebody decreases. The mineralization-alteration degree is enhanced. Both the distribution of the orebody and the alteration zone closely associated with the orebody are strictly controlled by the metallogenic tectonics. The main alteration types of the deposit are dolomitization calcite pyrite silicification and so on. The mineralization types are sphalerite and galena, according to the color of altered dolomite, rock fabric, petrological characteristics, the spatial relationship with orebody, mineralization-alteration intensity and so on. The mineralization-alteration zone in the deep part of the deposit is: from the surrounding rock to the orebody, the gray-white coarse grain dolomite belt (鈪，

本文編號：1366167