本文選題：海溝金礦 + 礦床成因��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：海溝金礦位于吉林省延邊朝鮮族自治州安圖縣兩江鎮(zhèn),在大地構(gòu)造位置上屬于華北板塊北緣東段的夾皮溝—海溝金礦帶的東南端,東北側(cè)毗鄰興蒙造山帶。研究區(qū)太古宙時(shí)期屬于強(qiáng)烈活動(dòng)的花崗—綠巖帶,此后經(jīng)歷了古生代的古亞洲洋構(gòu)造域和中生代的太平洋構(gòu)造域的構(gòu)造、巖漿活動(dòng)疊加和改造。海溝金礦位于呈NW向分布的清茶館—白水灘斷裂帶和呈NE向分布的集安—松江斷裂帶(又稱兩江斷裂帶)的交匯部位。海溝金礦礦區(qū)內(nèi)出露的地質(zhì)體主要為中元古界色洛河群變質(zhì)巖系、海西期海溝二長(zhǎng)巖—二長(zhǎng)花崗巖、燕山期石人溝黑云母二長(zhǎng)花崗巖、大海溝輝長(zhǎng)閃長(zhǎng)巖以及不同走向的閃長(zhǎng)玢巖、正長(zhǎng)閃長(zhǎng)斑巖、輝綠巖等脈巖。海溝金礦主要產(chǎn)于海溝巖體之中,已發(fā)現(xiàn)50余條金礦脈。金礦脈(體)主要受斷裂構(gòu)造控制,其中NE-NNE的斷裂構(gòu)造是最主要的控礦、容礦構(gòu)造,NE-NNE向展布的28#、38#、43#脈帶和NW向展布的33#脈帶是海溝金礦最主要的生產(chǎn)礦脈。礦化類型以含金石英脈為主,蝕變巖型金礦化較少,主要分布在礦脈的深部和邊部。含金石英脈型金礦石的礦石礦物以自然金、黃鐵礦、黃銅礦、方鉛礦、閃鋅礦、輝鉬礦為主,脈石礦物則以石英、碳酸鹽礦物為主。深部礦體中輝鉬礦的含量增高。主要圍巖蝕變類型有包括鉀化、硅化、黃鐵礦化、絹英巖化和高嶺土化、綠泥石化和綠簾石化及碳酸鹽化,其中以鉀化和硅化最為顯著,金礦化與硅化和絹英巖化關(guān)系最密切。成礦可劃分為5個(gè)階段,即暗紅色細(xì)粒石英—赤鐵礦—瀝青鈾礦階段、白色脈石英—鉀長(zhǎng)石階段、灰色脈石英—黃鐵礦階段、煙灰色石英—多金屬硫化物階段、石英—方解石—黃鐵礦階段。氣液包裹體研究表明,海溝金礦成礦流體總體上屬于co2-h2o-nacl體系,具有中溫、中低鹽度(早期少量高鹽度)的特點(diǎn)。硫、鉛同位素分析表明成礦物質(zhì)來源于地幔或以殼�；煸礊橹鳌：辖鸬V產(chǎn)于晚古生代花崗質(zhì)巖中,應(yīng)屬于與中基性巖體及脈巖有關(guān)的中溫巖漿熱液型金礦床,與典型的造山型金礦有一定差別。海溝二長(zhǎng)巖—二長(zhǎng)花崗巖相對(duì)富集rb、ba、k等大離子親石元素(lile),相對(duì)虧損nb、p、ti等高場(chǎng)強(qiáng)元素(hfse),sr同位素初始比值(87sr/86sr)i為0.705656~0.705837,εnd(t)值為-10.42~-8.62,兩階段nd虧損地幔模式年齡tdm2為1.84ga~1.99ga,206pb/204pb值為17.2195~17.4301,207pb/204pb值為15.4659~15.5212,208pb/204pb值為37.1721~37.6601�？傮w上屬于古生代古亞洲洋消減作用形成的高鉀鈣堿性i型花崗巖,并具有殼�；煸吹奶攸c(diǎn)。石人溝黑云母二長(zhǎng)花崗巖相對(duì)富集rb、ba、k等大離子親石元素(lile),相對(duì)虧損nb、p、ti等高場(chǎng)強(qiáng)元素(hfse),sr同位素初始比值(87sr/86sr)i為0.70695,εnd(t)值為-13.1,兩階段nd虧損地幔模式年齡tdm2為2.06ga,206pb/204pb值為17.5380,207pb/204pb值為15.5240,208pb/204pb值為37.7980。總體上屬于中生代太平洋板塊向歐亞板塊俯沖作用形成的i型大陸弧花崗巖類,并具有殼�；煸吹奶攸c(diǎn)。大海溝輝長(zhǎng)閃長(zhǎng)巖相對(duì)富集rb、ba、k、sr、hf等大離子親石元素(lile)以及th、u等放射性元素,相對(duì)虧損nb、p、ti等高場(chǎng)強(qiáng)元素(hfse),sr同位素初始比值(87sr/86sr)i為0.70465~0.70450,εnd(t)值為3.8~4.3,兩階段nd虧損地幔模式年齡tdm2為586ma~623ma,206pb/204pb值為18.5586~18.6337,207pb/204pb值為15.5861~15.5858,208pb/204pb值為38.6164~38.6651。形成于燕山晚期由擠壓造山向伸展環(huán)境轉(zhuǎn)變的時(shí)代,巖體物質(zhì)來源于地幔,并受到地殼物質(zhì)的混染。鋯石u-pb同位素測(cè)年表明海溝巖體的成巖年齡為326.1±2.5ma,石人溝巖體的成巖時(shí)代為169.7±1.3ma,大海溝巖體成巖時(shí)代為132.6±0.8ma。與金礦成礦關(guān)系密切的閃長(zhǎng)玢巖的成巖年齡為128±12ma、正長(zhǎng)閃長(zhǎng)斑巖以及成礦前—成礦期輝綠巖的成巖年齡分別是132.4±1.5ma和131.5±0.5ma。綜合分析認(rèn)為海溝金礦的成礦年齡可被限定在132.6~128ma之間。根據(jù)與海溝金礦有關(guān)的巖漿巖體的研究,結(jié)合礦區(qū)成礦地質(zhì)事件分析,認(rèn)為海溝金礦的成礦動(dòng)力學(xué)背景為太平洋板塊向歐亞板塊俯沖條件下陸下軟流圈地幔上涌、地幔巖石圈拆沉、減薄,所導(dǎo)致的強(qiáng)烈構(gòu)造、巖漿和熱液活動(dòng)。
[Abstract]:The hitou gold mine is located in Liangjiang Town, Antu County, Yanbian, Jilin province. It belongs to the southeast end of the jacket - hinggou gold belt in the eastern part of the north margin of the North China plate, and the northeast side is adjacent to the Xingmeng belt. The Archean period belongs to the granite greenstone belt, which is a strong activity in the Archean period. After that, the Paleozoic Gu Yazhou was experienced. The tectonics of the Pacific tectonic domain and the Mesozoic Pacific tectonic domain, the superposition and transformation of magmatic activity. The Gigu gold deposit is located in the NW distribution of the Qing tea house white water beach fault zone and the Ji'an Songjiang fault zone (also known as the Liangjiang fault zone). The geological body in the Hai Gou Gold Mine is mainly the Middle Proterozoic salad. The metamorphic rock system of the river group, the Heisi trench two long granite, the two feldspar granite, the Yanshan phase of the Heigu black mica two granite, the gutterage diorite and different diorite porphyrite, the long diorite and the diabase, the Heigu gold deposit is mainly produced in the gully rock, and more than 50 gold veins have been found. The gold vein (body) is mainly broken. Crack structure control, in which the fracture structure of NE-NNE is the most important ore control, the ore bearing structure, the 28#, 38#, 43# vein and NW direction of the distributed 33# vein belt are the most important production veins in the NE-NNE. The mineralization type is mainly composed of gold and stone quartz veins, and the altered rock type gold mineralization is less, mainly distributed in the deep and edge veins of the vein. The ore minerals of the gold ore are mainly natural gold, pyrite, chalcopyrite, galena, sphalerite, and molybdenite. The gangue minerals are mainly quartz and carbonate minerals. The content of Molybdenite in the deep orebodies increases. The main types of rock alteration include potassium, silicification, Huang Tie mineralization, sericite and KAOLINIZATION, green and chlorinization and epidote. And carbonation and carbonation, of which potassium and silicification are most significant, gold mineralization is most closely related to silicification and sericite. The mineralization can be divided into 5 stages: dark red fine quartz - hematite - Bituminous stage, white vein quartz - potassium feldspar stage, gray vein quartz - pyrite stage, smoke gray quartz - polymetallic sulfide stage In the phase of quartz calcite pyrite, the study of gas-liquid inclusions shows that the metallogenic fluid of the Hai Gou Gold deposit belongs to the co2-h2o-nacl system in general, with the characteristics of middle and low salinity (early small amount of high salinity). The analysis of sulfur and lead isotopes indicates that the metallogenic material is derived from the mantle or the mixed source of crust and mantle. The gold deposit in the trench is produced in the late Paleozoic granite. In the rock, we should belong to medium temperature magmatic hydrothermal gold deposits related to medium basic rock mass and vein rock, which are different from typical orogenic gold deposits. The two long rock and two granites in the trench are relatively rich in Rb, Ba, K and other large ion lithophilic elements (lile), relative to the loss of Nb, P, Ti and other high field elements (HFSE), and the initial ratio of Sr isotopes (87sr/86sr) I is 0.705 656~0.705837, the value of epsilon Nd (T) is -10.42~-8.62, the two stage nd loss mantle model age tdm2 is 1.84ga~1.99ga, 206pb/204pb value is 17.2195~17.4301207pb/204pb value of 15.4659~15.5212208pb/204pb value is the high potassium calcium alkaline I type granite which belongs to the Paleozoic Paleozoic Paleozoic subduction, and has the crust and mantle mixture. The characteristics of the source are that the two feldspar granites are relatively rich in Rb, Ba, K and other large ionic stone elements (lile), relative to the loss of Nb, P, Ti and other high field elements (HFSE), the initial Sr isotope ratio (87sr/86sr) I is 0.70695, and the two stage of the two stage of the loss of mantle model age is 15.. The 5240208pb/204pb value is 37.7980. generally belonging to the I type continental arc granitoids formed by the subduction of the Mesozoic Pacific plate to the Eurasian plate, and has the characteristics of the mixed source of the crust and mantle. The long diorite of the sea gully long diorite is relatively rich in Rb, Ba, K, Sr, HF and other large ionic stone elements (lile), th, and u. The initial ratio of the strong element (HFSE), the initial ratio of Sr isotopes (87sr/86sr) I is 0.70465~0.70450, the value of the epsilon Nd (T) is 3.8~4.3, the two stage nd depleted mantle model age tdm2 is 586ma~623ma, and the 206pb/204pb value is formed at the late Yanshan from the extrusion orogeny to the extension environment. The rock mass originates from the mantle and is contaminated by the crust material in the time of change. The zircon U-Pb isotope dating shows that the age of the diagenesis of the trench rock mass is 326.1 + 2.5mA, the age of the diagenesis of the stone man gully rock is 169.7 + 1.3mA, and the diorite porphyrite age of 132.6 + 0.8ma. with the gold mineralization in the great trench rock age is 128. The age of the diagenesis of the normal long diorite porphyry and the pre metallogenic phase of the metallogenic phase of diabase is 132.4 + 1.5mA and 131.5 + 0.5ma.. The metallogenic age of the gutting gold deposit can be limited to 132.6~128ma. According to the study of the magmatic rock mass related to the gutage gold mine and the analysis of the metallogenic geological events in the mining area, it is considered that the gutting gold deposit The metallogenic dynamics background is that the Pacific plate subducted under subduction of the Eurasian plate, the subcontinental asthenosphere mantle upwelling, the mantle lithosphere delamination and thinning, resulting in strong structure, magma and hydrothermal activity.
【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】：2017
【分類號(hào)】：P618.51

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