本文選題：東昆中基底隆起花崗巖帶　切入點：地質(zhì)特征　出處：《吉林大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：青海省東昆侖造山帶截至目前,已發(fā)現(xiàn)了眾多礦床(點),近年來隨著地區(qū)內(nèi)巖漿銅鎳硫化物礦床的找礦突破,該類礦床的研究逐步深入。阿克楚克塞銅鎳礦的發(fā)現(xiàn)是繼夏日哈木鎳礦后,該類型礦床找礦的又一重大突破,為區(qū)內(nèi)巖漿型銅鎳硫化物礦床的尋找提供了重要參照。阿克楚克塞銅鎳礦位于昆中斷裂北部的昆中基底隆起花崗巖帶上。出露新元古代金水口群、寒武-奧陶紀灘間山群。斷裂構(gòu)造發(fā)育,主要有2條近北西向斷裂F5和F6。斷裂規(guī)模大,延伸遠,2條構(gòu)造均為壓扭性質(zhì)。區(qū)內(nèi)巖漿巖主要是新元古代黑云二長片麻巖、早-中志留世的花崗閃長巖和鎂鐵質(zhì)-超鎂鐵質(zhì)雜巖、華力西-印支期的花崗斑巖、石英閃長巖和花崗巖等。阿克楚克塞地區(qū)先后發(fā)現(xiàn)了 5個基性-超基性巖體,其中Ⅰ、Ⅱ號巖體已開展大量工作,探槽及鉆孔內(nèi)可見較多的硫化物,可見表生的鎳華與銅藍,礦石品位較高。Ⅲ、Ⅳ、Ⅴ號巖體為17年新發(fā)現(xiàn),從現(xiàn)已施工情況看,可見較多的硫化物,具有很好的成礦潛力。Ⅰ號巖體近SN向展布,傾向E,其內(nèi)可見較多的灘間山群大理巖捕擄體。礦體長軸走向北北東,形態(tài)不規(guī)則,延伸不穩(wěn)定,品位變化大。Ⅱ號巖體第四系覆蓋嚴重,總體走向NE,傾向SE。Ⅱ號礦體向深部膨大、變厚、品位升高的趨勢尤為明顯。幾乎所有樣品高于0.1%,連續(xù)性好,出現(xiàn)了較高品位地段,并且出現(xiàn)了海綿隕鐵結(jié)構(gòu)等代表富礦石的現(xiàn)象。Ⅰ、Ⅱ號巖體含礦巖相主要為輝石巖相。巖體與大理巖間為切層侵入關(guān)系。鎂鐵-超鎂鐵質(zhì)雜巖體為多期侵入而成,在深部巖漿房發(fā)生了硫化物熔離作用。在一定的動力學(xué)條件下,不含礦巖漿、含礦巖漿、富礦巖漿和礦漿依次脈沖式上侵,形成現(xiàn)今的浸染狀和海綿隕鐵狀礦石。根據(jù)電子探針結(jié)果,輝石主要為單斜輝石類的頑透輝石,En61.64～-65.6,Fs7.74～10.74,Wo22.96-～26.01,為亞堿性系列里的拉斑玄武巖系列,形成于與弧有關(guān)的環(huán)境中。Ⅰ、Ⅱ號巖體即為礦體,這兩個礦體具有相似的礦物組構(gòu)。主要有鎳黃鐵礦(Pn)及鎳華、黃銅礦(Cpy)及銅藍、磁黃鐵礦(Po),少量的紫硫鎳礦、褐鐵礦、黃鐵礦及白鐵礦。含鈷的礦物未知,其存在形式為主要呈類質(zhì)同相存在于鎳黃鐵礦中;礦石具特征的海綿隕鐵結(jié)構(gòu)、固溶體分離結(jié)構(gòu)、自形-半自形粒狀結(jié)構(gòu)、他形粒狀結(jié)構(gòu)、不等粒結(jié)構(gòu)和交代結(jié)構(gòu);星點狀構(gòu)造、斑雜狀構(gòu)造、團塊狀構(gòu)造、浸染狀構(gòu)造,很少有塊狀構(gòu)造、細脈狀構(gòu)造。巖礦石的硫同位素及S/Se研究表明,δ34S變化范圍為6.7‰～11.5‰,偏離幔源硫0±2‰;S/Se比值為3738～15501,大于地幔平均值。以上表明巖漿從地幔上涌的過程中,有地殼硫的加入。對阿克楚克塞巖體輝石巖進行了 LA-ICP-MS U-Pb測年,厘定了其結(jié)晶年齡為422±10Ma,為中志留世。巖體的Zr/Nb比值為16.75～30.93,與MORB的Zr/Nb比值(10～60)比較接近,Sm/Nd比值為0.18～0.25,基本與MORB的范圍(平均值0.32)相同,這些證據(jù)表明巖漿源區(qū)主體應(yīng)為軟流圈地幔。Harker圖解中元素的相關(guān)性分析表明,巖漿可能經(jīng)歷了橄欖石、斜方輝石、單斜輝石和斜長石的分離結(jié)晶作用,碳酸鹽圍巖的混染,二者共同作用導(dǎo)致硫化物熔離成礦。對阿克楚克塞銅鎳礦進行了區(qū)域、礦區(qū)及礦床地質(zhì)和鎂鐵-超鎂鐵巖體特征的總結(jié)、硫同位素及S/Se、成礦時代和動力學(xué)背景研究,認為阿克楚克塞銅鎳礦為中志留世形成的,屬于深部熔離-脈沖式貫入型礦床。其有利的構(gòu)造背景為大洋板片俯沖拉伸,斷離,形成板片窗,軟流圈物質(zhì)上涌,經(jīng)分離結(jié)晶,同化混染作用使硫飽和,動力學(xué)條件適當(dāng)?shù)臅r候,多次上涌形成了阿克楚克塞銅鎳礦。
[Abstract]:Qinghai Province, East Kunlun orogenic belt, as of now, has found numerous deposits (spots) in recent years, with the area of magmatic Cu Ni sulfide deposit prospecting breakthrough, the research of this kind of deposits gradually. Chris Alexis Chu copper nickel was found following the summer hamu nickel, another major breakthrough in this type of deposit prospecting which provides important reference for the search area of magmatic Ni Cu sulfide deposits. Chris Alexis copper nickel mine is located in the Chu Kunlun fault in northern Queensland in the basement uplift granite belt. The exposed Proterozoic Jinshuikou group, Cambrian Ordovician Tanjianshan group. There are 2 main faults, near north the F5 and F6. trending fault fracture scale, extending far, 2 construction are transpressional nature. Magmatite in the area are mainly of Neoproterozoic biotite gneiss two, early middle Silurian granite diorite and mafic - ultramafic rocks, Variscan Indosinian Granite porphyry, quartz diorite and granite. Chris Alexis Chu has found 5 areas of basic ultrabasic rocks, which I and II have a lot of work carried out on the rock, sulfide trough and borehole more visible, visible surface of nickel and copper in China, ore grade is higher. 3. IV, V rock for 17 years from now that the construction situation, sulfide more visible, with the mineralization potential well. 1 the rock mass near SN trending tendency E, which showed more tanjianshangroup marble xenoliths. The long axis direction of NNE, irregular shape, the extension is not stable, large variation of grade II rock. The Quaternary overburden is serious, the overall tendency towards NE, SE. II orebody to deep swelling, thickening, grade increased obviously. Almost all of the samples is higher than 0.1%, good continuity, the higher grade area, and the emergence of sideronitic The structure represents the rich ore phenomenon. I, II, the ore rock lithofacies mainly for pyroxenite. Rock and marble for cutting layer. Intrusive mafic ultramafic intrusive complex is a multi period, the sulfide liquation in the deep magma chamber dynamics in certain conditions. Under no ore magma, ore magma, ore magma and ore pulp are pulsed on invasion, formed present disseminated and sideronitic ore. According to the results of electron probe, pyroxene is mainly clinopyroxene class endiopside, En61.64 ~ -65.6, Fs7.74 ~ 10.74, Wo22.96- ~ 26.01, sub alkaline in the series of tholeiitic series, and formed in the arc related environment. I, II is the rock ore body, the two bodies have the similar structure. The main mineral group with pentlandite (Pn) and Ni Hua, chalcopyrite (Cpy) and covellite, pyrrhotite (Po), violarite a small amount of, Limonite, pyrite and Marcasite. Cobalt mineral is unknown, its existing form is mainly in the same phase exists in nickel pyrite; sideronitic ore structure characteristics, exsolution texture, euhedral and subhedral anhedral granular structure and granular structure, inequigranular texture and metasomatic structure; star shaped structure, taxitic structure, crumb structure, disseminated structure, rarely has the massive structure, veinlet. Sulfur isotope and S/Se of rocks and ores show that the range of delta 34S 6.7 per thousand to 11.5 per thousand, from mantle sulfur 0 + 2 per thousand; the ratio of S/Se was 3738~15501, higher than the average value of the mantle. That process of magma from the mantle upwelling, with the addition of crustal sulfur. The Chris pyroxenite of Chu Alexis rock LA-ICP-MS U-Pb dating, determining the crystallization age of 422 + 10Ma, leaving the world for Chi. The ratio of Zr/Nb rock is 16.75 ~ 30.93, and MORB Zr/Nb The ratio (10~60) is close to that of the ratio of Sm/Nd is 0.18 ~ 0.25, with the basic MORB (average 0.32), the evidence suggests that the magma source should be indicated as subject elements related to asthenospheric mantle.Harker graphical analysis of the magma may have experienced olivine, oblique Fang Huishi, fractional crystallization of clinopyroxene and plagioclase the contamination of carbonate rock, the two together lead to segregation of sulfide mineralization. On Alexis copper and nickel were Chris Chu area, mining area and geological and ultramafic rock characteristics summary, sulfur isotope and S/Se, mineralization of the era and the dynamic background, that Chris Chu copper nickel mine in Alexis Silurian formation, belongs to deep liquation pulsed penetration type deposit. The favorable tectonic background for the oceanic plate subduction stretch, break off, forming a slab window, upwelling of the asthenosphere, separated by crystallization, assimilation The effect of sulfur saturation, when appropriate kinetic conditions, many upwelling formed copper nickel. Chris Chu Alexis

【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.41;P618.63

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