本文選題：東天山 + 阿齊山第一鐵礦　； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：東天山成礦帶在上世紀(jì)是中國鐵礦的重點(diǎn)找礦區(qū)。尤其是哈密地區(qū),有著最多的鐵礦資源和極富前景的成礦潛力。但該區(qū)鐵礦的地質(zhì)研究程度普遍較低,研究者對于一些典型鐵礦床的成因存在著分歧和爭議,例如雅滿蘇鐵礦和紅云灘鐵礦。因此,在覺羅塔格地區(qū)選取典型鐵礦床進(jìn)行剖析,對于理解區(qū)域內(nèi)鐵礦的成礦作用、成礦規(guī)律以及區(qū)域大地構(gòu)造演化是很有必要的。覺羅塔格地區(qū)阿齊山第一鐵礦賦存于雅滿蘇組火山巖中。其主礦體以似層狀形態(tài)產(chǎn)出,與圍巖的界線清晰。礦石主要有礦漿型和熱液型兩類,主礦體主要由的礦漿型礦石組成,熱液型貧礦礦石則表現(xiàn)為紋層狀和浸染狀。熱液蝕變礦石中礦物結(jié)晶順序?yàn)槭褡邮柶鹗?透閃石→磁鐵礦-鏡鐵礦-石英-綠簾石→石英-碳酸鹽-黃銅礦,據(jù)此可將熱液蝕變作用分為石榴子石階段、透閃石/陽起石-磁鐵礦/赤鐵礦-石英-綠簾石階段、石英-碳酸鹽-黃銅礦階段。該順序與典型矽卡巖礦床中矽卡巖礦物的結(jié)晶順序相一致。流體包裹體測溫?cái)?shù)據(jù)表明:石榴子石中流體包裹體的均一溫度有120~160℃和180~220℃兩個(gè)峰值,其均為次生包裹體均一溫度;綠簾石中流體包裹體均一溫度峰值為200~240℃,這與石英流體包裹體均一溫度的高溫峰值一致(180~240℃),此峰值代表磁鐵礦-赤鐵礦-綠簾石階段溫度范圍;石英中流體包裹體均一溫度還有一個(gè)低溫峰值(120~160℃),代表著石英-碳酸鹽-硫化物階段的溫度。綜合來看,阿齊山第一鐵礦屬于礦漿-熱液復(fù)合型礦床,可歸類為潛火山巖型礦床。本次研究選取了圍巖中X150714-8英安斑巖樣品進(jìn)行鋯石U-Pb年代學(xué)測試以及Hf同位素分析,其30顆鋯石的加權(quán)平均年齡為350±2 Ma(MSWD=0.21),代表了英安斑巖的結(jié)晶年齡,也可代表阿齊山第一鐵礦的成礦年齡。這與雅滿蘇鐵礦、紅云灘鐵礦、百靈山鐵礦、多頭山鐵礦以及庫姆塔格石膏菱鐵礦礦床形成的時(shí)代同期。對礦區(qū)內(nèi)圍巖樣品地球化學(xué)數(shù)據(jù)的分析表明,阿齊山第一鐵礦形成于大陸弧的大地構(gòu)造背景中。
[Abstract]:East Tianshan metallogenic belt was the key ore area of iron ore in China in the last century.Especially in Hami area, there are the most iron ore resources and the very promising metallogenic potential.However, the degree of geological study of iron ore in this area is generally low, and there is disagreement and controversy about the origin of some typical iron deposits, such as Yamensu Iron Mine and Hongyuntan Iron Mine.Therefore, it is necessary to select a typical iron deposit in Jolotag area to understand the metallogenic process, metallogenic law and tectonic evolution of the area.The first iron ore deposit of Aceh Mountain in Jolatag area is located in the volcanic rocks of Yamansu formation.The main orebody is produced in the similar stratiform form, and the boundary between the main orebody and the surrounding rock is clear.There are two main types of ore: slurry type and hydrothermal type. The main ore body is mainly composed of slurry type ore, while the hydrothermal lean ore is characterized by laminar and disseminated ore.In the hydrothermal alteration ore, the order of mineral crystallization is pomegranate, catalite, tremolite, magnetite, vitrinite, quartz, verdanite, carbonate and chalcopyrite, according to which the hydrothermal alteration can be divided into the pomegranate stage.Tremolite / actinolite-magnetite / hematite-quartz-green curtain stage, quartz-carbonate-chalcopyrite stage.This sequence is consistent with the crystallization sequence of skarn minerals in typical skarn deposits.The temperature data of fluid inclusions show that the homogenization temperatures of fluid inclusions in pomegranate have two peaks of 120 ~ 160 鈩，

本文編號：1741900