本文選題：礦床地質(zhì) + 礦床地球化學(xué)　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：松湖鐵礦產(chǎn)在新疆西天山阿吾拉勒鐵成礦帶中,其礦石類型多樣,成礦作用復(fù)雜,在該成礦帶鐵礦床中具有代表性。作者在前人研究的基礎(chǔ)上,對松湖鐵礦進行了礦區(qū)和礦床地質(zhì)以及礦床地球化學(xué)研究,查明了蝕變和礦化特征,劃分了礦石類型以及成礦期和成礦階段,探討了礦床形成過程,取得了一些有意義的成果和認識。野外調(diào)研和鏡下觀察表明,松湖鐵礦主要賦存在下石炭統(tǒng)大哈拉軍山組火山-沉積巖地層中。圍巖主要有安山巖、英安巖、凝灰?guī)r和凝灰質(zhì)砂巖,主礦體與賦礦圍巖呈不整合接觸。鐵礦石可分為礦漿、蝕變巖和熱液脈三種類型。礦漿型礦石呈蜂窩狀和條帶狀,蝕變巖型礦石呈浸染狀和斑雜狀,而熱液脈型礦石呈細脈和網(wǎng)脈狀。松湖鐵礦區(qū)圍巖蝕變發(fā)育,主要有綠泥石化、綠簾石化、陽起石化、磁鐵礦化、黃鐵礦化、鉀長石化、硅化和方解石化。其中鉀長石化呈面狀分布,綠泥石化、綠簾石化、陽起石化和磁鐵礦化呈帶狀分布,硅化和方解石化呈脈狀分布,而黃鐵礦化呈點狀分布。根據(jù)相互穿插關(guān)系以及礦物組合和結(jié)構(gòu)構(gòu)造特征,可將松湖鐵礦的成礦過程分為礦漿、火山熱液和表生三個成礦期。其中礦漿期包括磁鐵礦和黃鐵礦兩個成礦階段,火山熱液期包括鉀長石-綠泥石-磁鐵礦、陽起石-綠簾石-磁鐵礦和石英-硫化物-碳酸鹽三個成礦階段。表生期只有風化改造一個成礦階段。礦漿期成礦溫度為500℃~700℃,而熱液期成礦溫度為400℃左右。從論文獲得的資料來看,新疆松湖鐵礦為礦漿-火山熱液復(fù)合型鐵礦床。礦漿型礦石是由巖漿熔離的礦漿冷卻結(jié)晶形成的,蝕變巖型礦石是火山熱液交代火山巖形成的,而熱液脈型礦石是火山熱液在裂隙中充填結(jié)晶形成的。
[Abstract]:Songhu iron ore in the Awulale iron metallogenic belt in western Tianshan, Xinjiang, has various ore types and complex metallogenic processes, and is representative in the iron ore deposit of this metallogenic belt. On the basis of previous studies, the authors studied the ore area, ore deposit geology and deposit geochemistry of Songhu Iron Mine, identified the alteration and mineralization characteristics, divided the ore types, metallogenic periods and metallogenic stages, and discussed the formation process of the deposits. Some meaningful achievements and understandings have been achieved. Field investigation and microscopic observation show that Songhu iron deposit mainly occurs in volcanic and sedimentary strata of Lower Carboniferous Daharayanshan formation. The main rock rocks are andesite, dolomite, tuff and tuffaceous sandstone, and the main orebody is in unconformity with ore-bearing surrounding rock. Iron ore can be divided into three types: slurry, altered rock and hydrothermal vein. The slurry ore is honeycombed and banded, the altered rock ore is dyed and spotted, while the hydrothermal vein type is veined and reticulated. The surrounding rock of Songhu iron ore area is altered and developed, mainly including green mud petrifaction, green curtain petrifaction, actinolite, magnetite, pyrite, potassium feldspar, silicification and calcite. The distribution of potassium feldspar is plane, green mud, green curtain, actinite and magnetite are zonal, silicification and calcite are veined, and pyrite is dot. According to the intercalation relationship, mineral assemblage and structural characteristics, the metallogenic process of Songhu Iron Mine can be divided into three metallogenic periods: slurry, volcanic hydrothermal solution and supergene. The magmatic stage includes two stages of magnetite and pyrite, and the volcanic hydrothermal period includes three metallogenic stages: potassium feldspar-chlorite-magnetite, actinolite-verdite-magnetite and quartz-sulphide-carbonate. There is only one metallogenic stage in the epigenetic stage. The ore-forming temperature of slurry stage is 500 鈩，

本文編號：2057689