本文選題：內(nèi)蒙古　切入點(diǎn)：浩堯而忽洞　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：浩堯爾忽洞超大型金礦床產(chǎn)出于華北地臺(tái)北緣,賦存于黑色巖系含礦建造之中,該礦床品位低、儲(chǔ)量大、易開采,為該區(qū)典型金礦床之一。礦體產(chǎn)于白云鄂博群比魯特組第一、第二巖性段的炭質(zhì)板巖、炭質(zhì)千枚巖之中,嚴(yán)格受地層及構(gòu)造控制,總體呈層狀、似層狀產(chǎn)出。本文著重對(duì)礦床的構(gòu)造控礦特征進(jìn)行工作,對(duì)礦區(qū)的褶皺、斷裂以及構(gòu)造活動(dòng)產(chǎn)生的節(jié)理、顯微構(gòu)造等進(jìn)行了細(xì)致的工作,從而分析構(gòu)造活動(dòng)對(duì)礦床形成的影響,探究構(gòu)造成礦演化模式。礦區(qū)構(gòu)造活動(dòng)強(qiáng)烈,巖石變質(zhì)強(qiáng)烈,破碎、節(jié)理等構(gòu)造發(fā)育明顯。礦區(qū)內(nèi)節(jié)理大量的統(tǒng)計(jì)分析表明,礦區(qū)內(nèi)節(jié)理傾向優(yōu)選方位主要集中于50~70°、240~260°范圍內(nèi),其次為NNE-SSW方位;通過對(duì)礦區(qū)內(nèi)部共軛剪節(jié)理的分析,估算礦區(qū)所受應(yīng)力情況,得出礦體的所受到的主應(yīng)力σ1方向集中于NE-SW,應(yīng)力方向較為集中。礦區(qū)顯微構(gòu)造特征表明,礦區(qū)經(jīng)歷了由韌性變形到脆性變形的轉(zhuǎn)變。通過石英SR型動(dòng)態(tài)重結(jié)晶與方解石雙晶紋類型,得出礦床經(jīng)歷了一個(gè)由較高溫度向低溫轉(zhuǎn)變的過程;通過石英重結(jié)晶顆粒法估算,石英動(dòng)態(tài)重結(jié)晶時(shí)古差應(yīng)力值在25.64MPa~55.38MPa之間,表現(xiàn)為較低的應(yīng)力值范圍。綜上可知由于礦區(qū)溫壓條件的改變,浩堯而忽洞向斜巖層由韌性變形轉(zhuǎn)變?yōu)榇嘈宰冃?在韌-脆性過渡域作用下,出現(xiàn)大量的節(jié)理、破碎帶等利于成礦熱液流體運(yùn)移的通道,而后,晚古生代海西期大規(guī)模的巖漿侵入活動(dòng)帶來了大量的巖漿熱液,從而導(dǎo)致了金的富集。
[Abstract]:The super large gold deposit of Haoyaoerhuodong occurred in the Taibei margin of North China and occurred in the ore-bearing formation of the black rock series. The deposit is of low grade, large reserves and easy to be mined, which is one of the typical gold deposits in this area. The carbonaceous slate and carbonaceous phyllite of the second lithologic member are strictly controlled by stratigraphy and structure, and are generally stratiform and bedded. This paper focuses on the structural ore-controlling characteristics of the deposit and the fold of the ore area. In order to analyze the influence of tectonic activity on the formation of ore deposits and to explore the tectonic metallogenic evolution model, the tectonic activity of the mining area is strong, the rock metamorphism is strong and the rock is broken. A large number of statistical analysis of the joints in the mining area show that the preferred orientation of the joints in the mining area is mainly concentrated in the range of 5070 擄/ 240 ~ 260 擄, followed by the NNE-SSW azimuth, and the conjugate shear joints in the mining area are analyzed. By estimating the stress in the mining area, it is concluded that the principal stress 蟽 _ 1 of the orebody is concentrated in NE-SWand the stress direction is relatively concentrated. Through the dynamic recrystallization of quartz SR type and the double grain type of calcite, the ore deposit has undergone a process of transition from higher temperature to lower temperature, and the quartz recrystallization particle method is used to estimate, During the dynamic recrystallization of quartz, the paleo-differential stress is between 25.64 MPA and 55.38 MPA, which shows a lower stress range. In summary, it is found that due to the change of temperature and pressure conditions in the mining area, the paleo-differential stress in the syncline of Haoyaodong has changed from ductile deformation to brittle deformation. Under the action of ductile and brittle transition zone, a large number of joints and broken zones were found to facilitate the migration of ore-forming hydrothermal fluids, and the massive magmatic intrusions during the late Paleozoic Hercynian period resulted in a large amount of magmatic hydrothermal fluids. This leads to the enrichment of gold.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

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