發(fā)布時間：2018-04-15 01:20

  本文選題：白音諾爾 + 礦床地質(zhì)��； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：白音諾爾鉛鋅礦床位于內(nèi)蒙古赤峰市巴林左旗白音勿拉鎮(zhèn)，大地構(gòu)造位置屬大興安嶺南部晚古生代造山帶。為了充分挖掘老礦山資源潛力，解決深部找礦及成因理論問題，最大限度的延長礦山服務(wù)年限，為地方經(jīng)濟發(fā)展提供有力支撐，本文重點對礦區(qū)內(nèi)控礦構(gòu)造類型、成礦物質(zhì)來源以及成礦流體特征予以詳細闡述，并結(jié)合前人研究成果對礦床地質(zhì)特征及礦床成因類型進行系統(tǒng)概括及討論。 礦區(qū)內(nèi)出露地層相對簡單，主要有晚古生代早二疊世大石寨組、哲斯組，中生代晚侏羅世滿克頭鄂博組、瑪尼吐組以及第四系；研究區(qū)內(nèi)構(gòu)造特征明顯受區(qū)域構(gòu)造控制，褶皺、斷裂構(gòu)造均較為發(fā)育，早期褶皺變形特征顯著，后期多發(fā)育斷裂構(gòu)造，通過礦區(qū)內(nèi)及其外圍地區(qū)1:2000實測地質(zhì)剖面的測量及坑道編錄，表明白音諾爾鉛鋅礦礦體的產(chǎn)出受到褶皺與斷裂構(gòu)造的聯(lián)合控制；礦區(qū)內(nèi)巖漿巖分布較為廣泛，根據(jù)野外地質(zhì)資料及前人成果，可知與白音諾爾鉛鋅礦床成礦關(guān)系密切的巖體主要有花崗閃長（斑）巖、閃長玢巖及石英斑巖。 礦區(qū)分為南北兩個礦段，在礦體數(shù)量、規(guī)模、產(chǎn)狀、厚度、品位等方面均存在一定差異。根據(jù)礦石的礦物組合、結(jié)構(gòu)構(gòu)造及礦物或集合體之間的穿切關(guān)系，將白音諾爾鉛鋅礦床熱液成礦作用劃分為兩個成礦期五個成礦階段。通過對蝕變類型及其分布規(guī)律的分析，表明綠簾石化分布較為廣泛，并且隨著與礦體間距離的縮短，蝕變程度有著逐漸減弱的趨勢。在礦體集中的部位及其周圍，多發(fā)育含透輝石、石榴石等不同類型矽卡巖礦物的矽卡巖，證明矽卡巖化與礦化的形成有著明顯的聯(lián)系，但是，部分地區(qū)可見明顯的矽卡巖帶，而無礦化現(xiàn)象，說明矽卡巖化并非與成礦有直接聯(lián)系。而往往在矽卡巖附近發(fā)育碳酸鹽化、硅化明顯的部位，常具有一定規(guī)模礦體，暗示在矽卡巖化明顯的地區(qū)，若伴有一定的碳酸鹽化與硅化現(xiàn)象，則極有可能為礦化發(fā)育明顯的部位。 通過對礦石中金屬硫化物硫、鉛同位素的分析，指出成礦物質(zhì)主要來自巖漿。根據(jù)流體包裹體研究，Ⅰ-1階段主要發(fā)育氣液兩相包裹體（VL型）、富氣相包裹體（LV型）及含NaCl子礦物三相包裹體（SL型）三類包裹體。VL型包裹體均一溫度變化范圍為375.4℃～479.8℃，鹽度為10.73％～13.73％NaCleqv；LV型包裹體均一溫度變化范圍為415.2℃～458.4℃，鹽度為5.32％～7.67％NaCleqv；SL型包裹體均一溫度變化范圍為434.6℃～497.5℃，鹽度為42.15％～45.25％NaCleqv。Ⅰ-1階段流體屬中-高溫、高鹽度的不混溶NaCl-H2O體系熱液。Ⅰ-2階段發(fā)育VL型和LV型兩類包裹體，，VL型包裹體均一溫度的變化范圍為202.3℃～345.7℃，鹽度為5.17％～11.22％NaCleqv；LV型包裹體均一溫度為265.7℃～381.9℃，鹽度1.98％～5.01％NaCleqv。Ⅰ-2階段流體性質(zhì)為中溫、中等鹽度的不均勻NaCl-H2O體系熱液。Ⅱ-2階段（主成礦階段）主要發(fā)育VL型包裹體，均一溫度分布于165.9℃～258.7℃，鹽度為0.83％～5.62％NaCleqv，說明流體性質(zhì)為中-低溫、低鹽度的均一NaCl-H2O體系熱液。綜上結(jié)果，表明成礦流體由中-高溫、高鹽度不均勻NaCl-H2O體系向中-低溫、低鹽度均一NaCl-H2O體系熱液演化，在演化過程中經(jīng)歷了沸騰作用及自然冷卻過程，這應(yīng)是導(dǎo)致鉛鋅等金屬元素富集并最終形成工業(yè)礦體的主要機制。根據(jù)流體包裹體氫氧同位素分析，成礦流體在成礦早期應(yīng)來自巖漿水，而晚期則有大量大氣降水的參與，并在大氣降水的混入過程中對含礦物質(zhì)的富集起到一定促進作用。綜合以上研究成果并總結(jié)，認為白音諾爾鉛鋅礦床成因類型為矽卡巖型鉛鋅多金屬礦床，并且受兩期成礦影響，即印支期為主要成礦期，但受到燕山期成礦作用的疊加。
[Abstract]:The Baiyinnur lead - zinc deposit bed is located in Baiyin county , Bailin , Chifeng City , Inner Mongolia . It is located in the late Paleozoic orogenic belt in the southern part of Da Hinggan Mountains . In order to fully exploit the potential of old mine resources , to solve the problems of deep prospecting and genetic theory , to extend the service life of the mine to the maximum extent and to provide strong support for local economic development , this paper mainly expounds the structure types , the source of ore forming and the characteristics of ore - forming fluid in the mining area , and summarizes and discusses the geological characteristics of the deposit and the genesis type of the deposit in combination with the previous research results .

The exposed strata in the mining area are relatively simple , mainly including the Early Permian DaShi Village Formation in the Late Paleozoic , the Janus Formation , the Late Jurassic Man of the Middle Mesozoic , the Ebo Formation , the Mangnitun Formation and the Quaternary System ;
The structural features of the study area are obviously controlled by regional tectonic control , fold and fault structure , and the early fold deformation characteristics are obvious and the later - stage multi - development fault structure is controlled through the measurement of the geological profile measured by 1 : 2000 in the mining area and its outlying areas 1 : 2000 , indicating that the output of the Baiyinnur lead - zinc ore body is controlled by the joint control of the fold and the fault structure ;
The distribution of magmatic rocks in the mining area is more extensive , according to the field geological data and the results of the predecessors , it can be found that the rock mass closely related to the mineralization of Baiyinnur lead - zinc deposit is mainly granodiorite ( porphyritic ) , diorite porphyrite and quartz porphyry .

According to the mineral composition of ore , the structure of structure and the relationship between mineral or aggregate , the mineralization of Baiyinnur lead - zinc deposit is divided into five ore - forming stages .

Based on the analysis of the sulfur and lead isotopes of metal sulfide in ores , it is pointed out that the ore - forming minerals mainly come from magma . According to the fluid inclusions , the main development gas - liquid two - phase inclusions ( VL ) , gas - rich inclusions ( LV - type ) and three - phase inclusion bodies ( SL - type ) of NaCl - containing mineral three - phase inclusions ( SL - type ) are mainly developed in the 鈪

本文編號：1751883