本文選題：浩堯爾忽洞金礦　切入點：黑色巖系　出處：《中國地質大學(北京)》2017年碩士論文

【摘要】：內蒙古浩堯爾忽洞金礦,又名長山壕金礦,位于巴彥淖爾市烏拉特中旗新忽熱蘇木東北約10km處,大地構造位置處于華北陸塊北緣狼山-白云鄂博裂谷帶。礦床賦礦地層為白云鄂博群比魯特組,累計探明儲量148.5t,平均品位0.82g/t,是我國北方最大的堆浸金礦山,具有規(guī)模大、品位低、易開采的特點。礦區(qū)內1:200地質地球化學剖面調查發(fā)現(xiàn),Au元素品位與黃鐵礦脈、石英-黃鐵礦脈的發(fā)育程度呈明顯正相關,礦區(qū)內各類侵入巖體(脈)本身含金量不高,金物質來源不太可能由巖漿活動提供,但是侵入巖體脈周圍地層的Au含量有不同程度的升高,表明后期巖漿事件對金礦化有一定富集作用。分析表明,載金黃鐵礦輕重稀土分異程度比較高,稀土配分曲線右傾,具Eu的負異常和Ce的弱負異常或無異常,與碳質地層、礦區(qū)外圍地層的配分曲線和特征值相似,而與區(qū)內巖漿巖有所區(qū)別,說明成礦物質應該主要來源于地層。黃鐵礦硫同位素結果顯示δ34S的值集中在11.2‰-14.7‰,均值13.15‰,顯示浩堯爾忽洞金礦是單一硫源,而黃鐵礦微量元素Co/Ni比值1,Y/Ho比值與碳質淺變質巖相近,推斷成礦流體為變質流體,成礦物質應主要來自于碳質地層。碳質地層樣品的Sr/Ba比值為0.036~0.702,平均值為0.198,指示含礦碳質地層主要為陸源沉積。礦床有機地球化學研究結果表明,地層有機碳含量與Au元素一定程度負相關,說明Au的沉淀應該與有機質的熱解有一定關系。正構烷烴的碳數(shù)分布范圍為C11-C38,主要分布于C16-C27,主峰碳為C16和C18,表明研究區(qū)有機質應主要來源于菌藻類,(nC21+nC22)/(nC28+nC29)比值范圍0.74~3.10,均值1.81,指示海相有機質輸入;Pr/Ph范圍為0.51~0.84,均值為0.67,指示礦源層形成于鹽度正常的缺氧、還原沉積環(huán)境中。而鉑族元素中Ir的含量最高,均值為3.19×10-9,與原始地幔(3.2×10-9,McDonough et al,1995)非常接近,暗示Ir可能來源于地幔。Pd含量與金元素含量呈現(xiàn)一定的正相關(r=0.7970),而Ir與Au的相關性不明顯(r=-0.3221)�？偨Y浩堯爾忽洞金礦成礦模式為:(1)中元古代白云鄂博群沉積,在缺氧還原環(huán)境中,預富集形成了最初的富硫、鐵、金和有機質的礦源層,主要證據(jù)是地層中廣泛發(fā)育的星點狀、針尖狀黃鐵礦和碳質成分;(2)新元古代到石炭紀晚期,同步于區(qū)域構造作用發(fā)生褶皺變形的石英-黃鐵礦脈和黃鐵礦脈,表明該時期初步富集形成了含礦建造和礦胚;(3)海西期巖漿侵入,使地層中的預富集金發(fā)生了活化遷移,加富了有利地段局部金礦的品位。
[Abstract]:Inner Mongolia Haoyaoer and hole gold, also known as changshanhao gold deposit, located in Bayannaoer City, Wulatezhongqi Xinhure hematoxylin northeast at about 10km, tectonically located in the northern margin of the North China Craton Langshan Baiyunebo rift zone. Ore deposits and ore formation is the Baiyunebo group bierut total proven reserves of group 148.5t, the average grade of 0.82g/t, is the largest heap leaching of gold mines in northern China, with a large scale, low grade, easy mining. 1:200 geological geochemical profile survey found within the mining area, Au grade and pyrite veins, showed a positive correlation with the degree of development of quartz pyrite veins, various types of intrusive rocks within the mining area (vein) itself is not high gold content, gold source material not too may be provided by magmatic activity, but the content of Au invasion formation around the rock veins increased in different degree, indicating that the late magmatic events have a certain effect on the enrichment of gold mineralization. The results show that, Bearing pyrite REE fractionation degree is relatively high, REE patterns, negative anomaly and weak negative Ce Eu anomaly or no anomaly, and carbonaceous strata, the periphery of the mining strata distribution curve and the characteristic value of similar and different and magmatite zone, indicating that the matter should be the main source of minerals in the formation. Pyrite sulfur isotope indicates the delta 34S values from 11.2 -14.7%%, average 13.15 per thousand, Haoyaoer display hole suddenly gold deposit is a single sulfur source, and trace elements in pyrite Co/Ni ratio 1, Y/Ho ratio and carbonaceous shallow metamorphic rock is similar to that inferred mineralization fluid of metamorphic fluid, metallogenic material should be mainly from the carbonaceous strata Sr/Ba. The ratio of carbonaceous formation sample was 0.036~0.702, the average value is 0.198, indicating the ore carbonaceous strata are mainly terrigenous sedimentary deposits. Organic geochemical study shows that organic carbon content of the formation and Au elements to a certain extent Negative correlation, indicating that Au should have a certain relationship with the precipitation of pyrolysis of organic matter. The carbon number range of alkanes is C11-C38, mainly in C16-C27, C16 and C18 as the main peak carbon. The results showed that the organic matter in study area should be mainly derived from bacteria and algae, (nC21+nC22) / (nC28+nC29) ratio range of 0.74~3.10. The mean value of 1.81, indicating the marine organic matter input; the Pr/Ph range is 0.51~0.84, the average is 0.67, indicating the ore source layer formed in anoxic normal salinity, reducing sedimentary environment. While the content of platinum group elements in Ir is the highest, the average is 3.19 * 10-9, and the primitive mantle (3.2 x 10-9 McDonough, et al, 1995) very close, suggesting that Ir may be derived from the mantle.Pd content and metal element content showed a positive correlation (r=0.7970), and the correlation between Ir and Au was not significant (r=-0.3221). Hojaur summed up the hole suddenly gold metallogenic model: (1) the Mesoproterozoic Baiyunebo group deposition, reducing ring in hypoxia In the environment, pre enrichment form of sulfur rich, the first iron ore source layer, gold and organic matter, the main evidence is widely developed in the formation of star shaped, needle like pyrite and carbonaceous composition; (2) late Proterozoic to late Carboniferous, synchronized with the regional tectonic action fold deformation of quartz pyrite veins and pyrite veins, showed that the period of preliminary enrichment of ore formation and ore formation of the embryo; (3) the Hercynian magmatic intrusion, the formation of pre enrichment of gold occurred in the activation and migration with rich local gold favorable area taste.

【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.51
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本文編號：1674737