本文選題：角礫巖筒 + 金礦床��； 參考：《吉林大學(xué)》2017年碩士論文

【摘要】：金廠礦床位于我國(guó)黑龍江省東寧縣境內(nèi),是由武警黃金部隊(duì)第一支隊(duì)發(fā)現(xiàn)的一處特大型金礦床。大地構(gòu)造位置處于太平嶺隆起與老黑山斷陷的交接部位。礦區(qū)內(nèi)地層出露較少,斷裂構(gòu)造發(fā)育,呈“米”字型構(gòu)造格局,巖漿巖侵入體廣布,先后有五期巖漿侵入活動(dòng)發(fā)生。礦區(qū)內(nèi)有三種礦化類型:角礫巖筒型、細(xì)脈浸染型以及環(huán)狀、放射狀裂控型,其中角礫巖筒型礦化是金廠礦區(qū)內(nèi)已發(fā)現(xiàn)的規(guī)模最大的礦體類型,資源量占礦床總資源量的44%。前人對(duì)于礦區(qū)內(nèi)的角礫巖筒缺乏系統(tǒng)的比較,對(duì)該類型礦化的找礦評(píng)價(jià)標(biāo)志總結(jié)得也不夠完善,基于此,本文對(duì)礦區(qū)內(nèi)的角礫巖筒進(jìn)行了系統(tǒng)的分類研究及成因研究,以期為找礦勘查工作提供理論支撐。角礫巖筒主要分布于燕山期花崗巖與印支期閃長(zhǎng)巖接觸帶及各類斷裂構(gòu)造的交匯附近,平面上多呈橢圓形或近圓形,剖面上呈筒狀或漏斗狀。根據(jù)含金性及礦物組合的差異將礦區(qū)內(nèi)的角礫巖筒劃分為金-銅±鉬型角礫巖筒、單金型角礫巖筒以及貧礦型角礫巖筒三種類型。金-銅±鉬型角礫巖筒礦石礦物以黃銅礦、黃鐵礦為主,其次有少量輝鉬礦、赤鐵礦、磁鐵礦、方鉛礦、閃鋅礦和自然金,其中Au和Cu均達(dá)到工業(yè)品位;單金型角礫巖筒礦石礦物以黃鐵礦為主,其次有少量黃銅礦、方鉛礦、閃鋅礦、毒砂和自然金,其中僅Au達(dá)到了工業(yè)品位;貧礦型角礫巖筒礦石礦物較少,以黃鐵礦為主,方鉛礦、閃鋅礦次之,含礦性極差,不具備工業(yè)價(jià)值。角礫巖型礦石膠結(jié)物石英中原生流體包裹體非常發(fā)育,主要有四種類型的包裹體:含固體子礦物多相流體包裹體(S型)、氣相-富氣相流體包裹體(V型)、含NaCl子礦物三相流體包裹體(SL型)、氣液兩相流體包裹體(VL型)。流體包裹體顯微測(cè)溫特征及成礦流體氫氧同位素組成顯示,角礫巖筒型礦體的成礦流體為揮發(fā)相、高溫高鹽度溶液與熔漿的混合物,大氣降水參與程度不高。硫同位素組成顯示礦床中的硫?yàn)樯钤磶r漿硫,主要來(lái)源于地幔,有少量地殼硫加入,結(jié)合鉛同位素組成特征,推測(cè)成礦物質(zhì)主要來(lái)源于地幔,同時(shí)有不同程度的地殼物質(zhì)混入。前人同位素測(cè)年成果及本次測(cè)試結(jié)果顯示,角礫巖筒型礦床成礦年齡大約在102.9±2.7 Ma左右;故本文認(rèn)為角礫巖筒型礦床的形成主要與燕山晚期花崗斑巖(109±2.4Ma)的侵入活動(dòng)有關(guān),之后的閃長(zhǎng)玢巖(97.5±1.1Ma)的侵入活動(dòng)對(duì)角礫巖筒進(jìn)行了疊加礦化。角礫巖筒的空間分布與礦區(qū)內(nèi)的巖漿巖接觸帶、斷裂構(gòu)造交匯、礦化蝕變分帶及遙感解譯出的環(huán)狀構(gòu)造存在密切的聯(lián)系,角礫巖筒型礦體顯示出明顯的低阻高極化特征,此外,三種類型的角礫巖筒在礦石礦物組合、黃鐵礦標(biāo)型特征、流體包裹體顯微測(cè)溫特征以及土壤地球化學(xué)特征等方面存在一定差異,這些為總結(jié)角礫巖筒型礦體的找礦評(píng)價(jià)標(biāo)志提供了依據(jù)。
[Abstract]:The Jinchang deposit, located in Dongning County, Heilongjiang Province, is a super large gold deposit discovered by the first detachment of the Armed Police Gold Army. The tectonic position is located at the junction of Taiping Ridge uplift and Laoheishan fault depression. There are few outcrops in the interior of the mining area, the fault structure is developed, and the magmatic intrusions are widespread, and magmatic intrusions occur in five periods. There are three types of mineralization in the mining area: breccia tube type, vein-impregnated type and annular, radial type, in which breccia tubular mineralization is the largest type of orebody found in Jinchang Mine area, and the resource amount accounts for 44% of the total resources of the deposit. For the lack of systematic comparison of breccia barrel in mining area, the evaluation marks of prospecting for this type of mineralization are not well summarized. Based on this, a systematic study on classification and genesis of breccia tube in mining area has been carried out in this paper. In order to provide theoretical support for prospecting and exploration work. The breccia barrel mainly distributes near the junction of Yanshanian granite and Indosinian diorite contact zone and all kinds of faulted structures. Most of them are elliptical or nearly circular on the plane and the section is tubular or funnel-shaped. According to the difference of gold bearing property and mineral assemblage, the breccia barrel in the mining area is divided into three types: gold-copper 鹵molybdenum breccia tube, single gold-type breccia tube and ore-poor breccia tube. The main ore minerals of gold-copper 鹵molybdenum breccia barrel are chalcopyrite and pyrite, followed by a small amount of molybdenum, hematite, magnetite, galena, sphalerite and natural gold, among which au and Cu reach industrial grade. The ore minerals of single gold breccia barrel are mainly pyrite, followed by a small amount of chalcopyrite, galena, sphalerite, arsenopyrite and natural gold. Galena, sphalerite is the second, the ore-bearing property is extremely poor, and does not have industrial value. The primary fluid inclusions in quartz, a breccia type mineral cement, are well developed. There are mainly four types of fluid inclusions: multiphase fluid inclusions containing solid subminerals, gas-rich fluid inclusions (V-type), three-phase fluid inclusions with NaCl subminerals (SL type) and gas-liquid two-phase fluid inclusions (VL type). The microthermometric characteristics of fluid inclusions and the hydrogen and oxygen isotopic composition of ore-forming fluids show that the ore-forming fluids of breccia tubular orebodies are volatile phase, the mixture of high-temperature and high-salinity solution and slurry, and the participation of atmospheric precipitation is not high. The sulfur isotopic composition of the deposit shows that the sulfur in the deposit is a deep magmatic sulfur, mainly derived from the mantle, with a small amount of crustal sulfur added. Combined with the characteristics of lead isotopic composition, it is assumed that the ore-forming material is mainly derived from the mantle, and that there are different degrees of crustal material mixed in. The results of previous isotopic dating and this test show that the ore-forming age of breccia tubular deposits is about 102.9 鹵2.7Ma, so it is considered that the formation of breccia tube-type deposits is mainly related to the intrusive activity of granitic porphyry (109 鹵2.4 Ma) in the late Yanshanian period. The subsequent diorite-porphyrite intrusion of 97.5 鹵1.1 Ma has superimposed and mineralized the breccia tube. The spatial distribution of breccia tube is closely related to the contact zone of magmatic rock, the intersection of fault structure, the mineralization alteration zone and the ring structure interpreted by remote sensing. The breccia tube-type orebody shows obvious characteristics of low resistivity and high polarization. There are some differences among the three types of breccia tubes in mineral assemblages, pyrite typomorphic features, microthermometric characteristics of fluid inclusions and soil geochemistry, etc. These results provide a basis for summarizing the criteria for prospecting and evaluation of breccia tubular orebodies.
【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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