吉林靖宇常發(fā)溝金銅礦床地質(zhì)特征及礦化富集規(guī)律
本文選題:斑巖型礦床 + 礦床地質(zhì)。 參考:《吉林大學(xué)》2015年碩士論文
【摘要】:常發(fā)溝金銅礦床位于吉林省靖宇縣,是吉黑東部典型的斑巖型金銅礦床。大地構(gòu)造位置位于華北地臺(tái)北緣東段高級(jí)變質(zhì)區(qū)內(nèi),處于敦化-密山斷裂以南,屬于王家店—天合興多金屬成礦帶。 礦區(qū)地層出露簡(jiǎn)單,主要有太古宙鞍山群和第四系松散砂礫石層。礦區(qū)內(nèi)巖漿巖分布廣泛,分布面積約占礦區(qū)面積的1/2,以侵入巖為主,零星分布少量脈巖。按侵入時(shí)間從老到新主要侵入太古代花崗巖(2585.4±7.4Ma)與閃長(zhǎng)玢巖(2531.5±8.4Ma),晚三疊世花崗斑巖(218±1.4Ma)及早白堊世石英斑巖(118.11±0.92Ma)。其中早白堊世石英斑巖是常發(fā)溝金銅礦床的重要含礦巖體,巖石地球化學(xué)研究表明石英斑巖體為富硅、富鋁的高鉀鈣堿性系列-鉀玄巖序列巖石,形成于太平洋板塊俯沖于歐亞大陸之下的弧后伸展環(huán)境。 常發(fā)溝金銅礦區(qū)圈定了3個(gè)礦段—I礦段、II礦段及III礦段。礦體均為隱伏礦體,圍巖多為石英斑巖。本次研究發(fā)現(xiàn)金屬礦物主要為黃銅礦、輝鉬礦等。礦石構(gòu)造主要有團(tuán)塊狀構(gòu)造、浸染狀構(gòu)造及脈狀構(gòu)造。礦體圍巖蝕變具有典型的面型蝕變特征,由內(nèi)向外依次發(fā)育鉀質(zhì)蝕變帶(鉀化)—似千枚巖化蝕變帶(硅化、絹云母化)—泥質(zhì)蝕變帶(高嶺土化)—青磐巖化帶(碳酸鹽化、綠泥石化、綠簾石化)。大醬缸礦區(qū)位于常發(fā)溝礦區(qū)的西部,本次研究利用槽探工程進(jìn)行揭露,新發(fā)現(xiàn)多條金礦化體,以典型的黃鐵絹英巖為主,受構(gòu)造控制明顯。礦石礦物以細(xì)粒的黃鐵礦為主,另含少量的黃銅礦、方鉛礦、閃鋅礦、磁鐵礦等,圍巖蝕變類型主要為硅化、碳酸鹽化等。 流體包裹體研究發(fā)現(xiàn),礦區(qū)發(fā)育多種類型的包裹體。顯微測(cè)溫結(jié)果表明該區(qū)成礦流體系統(tǒng)從早期到晚期的演化過程中,成礦流體的溫度、鹽度、密度等系數(shù)呈逐漸降低的趨勢(shì)。常發(fā)溝礦床成礦流體顯示中高溫、中高鹽度的特點(diǎn),通過計(jì)算得出礦床的成礦壓力為3~22MPa,成礦深度為0.3~2.2km。大醬缸礦區(qū)的成礦流體具有中溫、低鹽度、低密度的特點(diǎn)。硫同位素研究表明成礦元素主要來自于地幔巖漿,有部分殼源巖漿的混入。 通過含礦巖體的年齡測(cè)定,可以初步判斷常發(fā)溝金銅礦床的成礦年齡在118Ma左右,屬于燕山晚期。礦床形成構(gòu)造背景為太平洋板塊俯沖后的弧后伸展環(huán)境中。通過對(duì)常發(fā)溝金銅礦床與國(guó)內(nèi)外典型斑巖型礦床對(duì)比分析,認(rèn)為常發(fā)溝金銅礦床成因類型應(yīng)定為斑巖型礦床。根據(jù)大醬缸金礦床的礦床地質(zhì)及成礦物理化學(xué)條件的特征研究,初步確定其成因類型為中溫?zé)嵋好}型金礦床。 礦化富集規(guī)律研究發(fā)現(xiàn),礦體整體賦存在石英斑巖體內(nèi),而且與面型蝕變帶相對(duì)應(yīng)地呈現(xiàn)礦化分帶,垂向上淺部主要發(fā)育方鉛礦化與閃鋅礦化,向深部發(fā)育輝鉬礦化及黃銅礦化,再向內(nèi)部發(fā)育黃鐵礦化與磁黃鐵礦,而在整個(gè)礦區(qū)范圍內(nèi),由于受到了北西向構(gòu)造的破壞作用,整體上呈現(xiàn)出西部相對(duì)富集鉛鋅礦化及褐鐵礦礦化,中部黃銅礦化、輝鉬礦化富集。因此,研究區(qū)中部為黃銅礦與輝鉬礦的重點(diǎn)富集區(qū)域,而北西部可能富集形成鉛鋅礦體。此外,西部的大醬缸礦區(qū)金成礦潛力很好,有待進(jìn)一步勘查研究。該礦床受北西向斷裂構(gòu)造控制明顯,因此建議今后以斷裂構(gòu)造為主攻方向,沿含礦構(gòu)造追索礦體,,并重視與理清成礦后構(gòu)造對(duì)礦體錯(cuò)斷、位移的影響。
[Abstract]:The Changdu gou gold - copper deposit is located in Jingyu County , Jilin Province . It is a typical porphyry type gold - copper deposit in the eastern part of Jilin Province . Its tectonic position is located in the high - grade metamorphic zone of the eastern part of the northern margin of the northern margin of North China . It is located south of the Dunhua - Mashan fault , and belongs to the multi - metal metallogenic belt of Wangjidian - Tianxing .
Early Cretaceous quartz porphyry is an important ore - bearing rock mass in the Changgou gold - copper deposit , and the late Triassic granodiorite is an important ore - bearing rock mass of the Changgou gold - copper deposit .
In this paper , three segments - I , II and III are trapped in the Au - Cu deposit . The ore bodies are hidden ore bodies , and the surrounding rocks are mostly quartz porphyry . The study shows that the metal minerals are mainly pyrite , molybdates and the like . The ore structures mainly include mass structure , disseminated structure and vein - like structure . Large - sized soy - jar mining area is located in the west of Changfa Mine , which is exposed by the trench exploration project . It has been newly discovered that multiple gold mineralization bodies are mainly composed of fine pyrite , and the structure control is obvious . The ore minerals mainly include fine pyrite , and a small amount of pyrite , galena , sphalerite , magnetite and so on . The type of alteration of surrounding rock is mainly silicification , carbonation and so on .
The results show that the ore - forming pressure of the ore - forming fluid is 3 - 22MPa and the ore - forming depth is 0.3 - 2.2km .
By the age determination of the ore - bearing rock mass , it is possible to preliminarily determine the ore - forming age of the Changfa gold - copper deposit at about 118Ma , which belongs to the late Yanshan . The formation tectonic background of the deposit is in the post - arc extension environment after subduction of the Pacific plate . By comparing the characteristics of the Changfa gold - copper deposit and the typical porphyry type deposit at home and abroad , the authors believe that the genesis type of the Changfa gold - copper deposit is the medium - temperature hydrothermal vein type gold deposit .
It is found that the whole ore body is distributed in the quartz porphyry body , and the mineralization zoning is presented to the surface type alteration zone . The main development of the vertical shallow part is mainly galena and sphalerite mineralization .
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:P618.51;P618.41
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