本文選題：膠東西北部 + 剪切相片麻狀花崗巖�。� 參考：《中國地質(zhì)大學(北京)》2017年碩士論文

【摘要】：膠東西北部地區(qū)廣泛出露與金礦形成密切相關(guān)的中生代花崗巖�，F(xiàn)階段,地質(zhì)工作者對膠東地區(qū)成礦花崗巖的研究主要采用單元-超單元的研究思路,隨著膠東西北部金礦深部找礦工作的推進和構(gòu)造地質(zhì)學的發(fā)展趨勢,本論文從花崗巖構(gòu)造巖相的角度,選擇玲瓏似片麻狀花崗巖作為研究對象,重點研究該類花崗巖的微觀結(jié)構(gòu)幾何特征,主要包括巖體的面理展布特征、S-C組構(gòu)和該結(jié)構(gòu)構(gòu)造的鏡下及手標本幾何形態(tài)。為構(gòu)造巖相的應(yīng)力分析提供了地質(zhì)依據(jù),具有重要的金礦勘查應(yīng)用價值和地質(zhì)科學意義。本人通過野外約5km2的區(qū)域地質(zhì)調(diào)查,對研究區(qū)的巖體的面理構(gòu)造現(xiàn)象進行了系統(tǒng)的觀測,取得了較多的實測數(shù)據(jù),編制面理展布軌跡圖;在露頭良好的觀測點,采集標準的定向樣品,進行室內(nèi)的微觀結(jié)構(gòu)構(gòu)造觀測,并以九曲—大開頭礦區(qū)48、50號脈為研究對象,進行井下中段地質(zhì)填圖與巖石地球化學測試分析,總結(jié)了礦床地質(zhì)特征和深部成礦規(guī)律,提出深部隱伏礦體預(yù)測靶區(qū),在這些工作的基礎(chǔ)上,取得以下認識:1、巖體面理展布軌跡圖顯示,在巖體中部,面理大致呈圓形或橢圓形分布,進一步驗證該類巖體巖漿在上侵過程中受區(qū)域擠壓剪切應(yīng)力形成了“巖漿核雜巖”隆起。2、建立剪切相似片麻狀花崗巖三維幾何構(gòu)造特征判別標志,進行有限應(yīng)變分析,利用弗林圖解求得K值為1.54,巖漿是在NW-SE的伸展環(huán)境背景冷卻固結(jié)成巖,最大主應(yīng)力方位近于水平。3、巖漿期后熱液蝕變巖石英流體包裹體均一溫度、鹽度測試結(jié)果表明,成礦流體具有中低溫、鹽度低的特點,并且鹽度和溫度呈現(xiàn)正向相關(guān);包裹體壓力計算結(jié)果表明,蝕變較強的部位壓力比蝕變作用較弱的部位小,是壓力、溫度逐步下降的過程。4、建立深部成礦預(yù)測指標,厘定深部金礦富集帶之間的距離約為200m,建立兩條礦脈深部成礦預(yù)測模型示意圖。其中50號脈礦體在深部探礦區(qū)中的預(yù)測深度大致在840m~1450m之間,而48號脈礦體在深部探礦區(qū)中的預(yù)測深度大致在1000m~1400m之間。
[Abstract]:The widespread outcrop in the north of Jiaobei area is closely related to the formation of Mesozoic granites. At present, the research of ore-forming granites in Jiaodong area mainly adopts the idea of unit superunit, along with the advance of deep prospecting and the development trend of tectonic geology of gold deposits in northwestern Jiaodong. In this paper, from the point of view of the tectonic facies of granite, Linglong granitoids are selected as the research objects, and the microstructural and geometric characteristics of the granites are mainly studied. It mainly includes the dissecting distribution characteristics of rock mass, S-C fabric and the microscopic and hand geometry of the structure. It provides geological basis for stress analysis of tectonic lithofacies and has important application value of gold exploration and geological scientific significance. Through the regional geological survey of 5km2 in the field, I have made systematic observation on the face structure phenomenon of rock mass in the study area, obtained more measured data, compiled the trace map of plane distribution, and made a good observation point in outcrop, Taking standard directional samples for indoor microstructure observation, taking the No. 48Y50 vein of Jiujiu-Daqou mining area as the research object, the geological mapping and rock geochemistry test analysis of the middle section of the mine are carried out. This paper summarizes the geological characteristics of the deposit and the rules of deep mineralization, and puts forward the prediction target area of the deep concealed orebody. On the basis of these works, the following understanding is obtained: 1, the trace map of the distribution of the rock decent distribution shows that, in the middle of the rock mass, The distribution of the surface is generally circular or elliptical. It is further proved that the magma of this kind of rock mass formed a "magmatic nuclear complex" uplift of .2during the process of upward invasion by regional compression shear stress, and established the discriminant mark of three-dimensional geometric structural characteristics of shearing similar lamellar granites, and analyzed the finite strain of the magma by finite strain analysis. By using Flynn diagram, the K value is 1.54, the magma is cooled and consolidated in the NW-SE extensional environment background, and the maximum principal stress orientation is close to horizontal .3.The homogenization temperature of the fluid inclusions in the hydrothermal alteration rocks after magmatic period, the salinity test results show that, The ore-forming fluid has the characteristics of moderate low temperature and low salinity, and the salinity is positively correlated with the temperature, and the pressure calculation results of inclusions show that the pressure of the place with stronger alteration is less than that of the weaker part of alteration. In the process of temperature decreasing gradually, the prediction index of deep ore-forming is established, the distance between the enrichment zone of deep gold deposit is about 200 m, and two ore-forming prediction models of deep vein are set up. The prediction depth of No. 50 vein ore body in deep prospecting area is approximately between 840m~1450m and that of No. 48 vein ore body in deep prospecting area is approximately between 1000m~1400m.
【學位授予單位】：中國地質(zhì)大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.51

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