本文選題：羅山金礦床　切入點：破頭青斷裂　出處：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：羅山金礦床位于膠西北玲瓏金礦田南部破頭青斷裂與九曲蔣家斷裂的交匯處,是玲瓏金礦田典型的蝕變巖型礦床。近年來,隨著淺中部已經(jīng)被采空,該礦床保有儲量急劇下降。礦化網(wǎng)絡是成礦系統(tǒng)應用于預測找礦的重要環(huán)節(jié),為更深入的認識金礦床、擴大其資源儲量并延長其服務年限,對其進行蝕變-礦化網(wǎng)絡結(jié)構(gòu)研究,服務于該礦床的深部找礦工作。論文以系統(tǒng)的野外地質(zhì)觀測和礦床探采資料為基礎,對羅山金礦床控礦構(gòu)造、蝕變分帶及礦化網(wǎng)絡結(jié)構(gòu)進行了研究。羅山金礦主要受斷裂控制,破頭青斷裂與次級控礦斷裂或節(jié)理裂隙分別控制了蝕變巖型礦體和多金屬硫化物脈型礦體的形態(tài)及產(chǎn)狀�？氐V斷裂經(jīng)歷了四期變形演化:早期韌性剪切變形、成礦前韌-脆性剪切變形、成礦期張剪脆性變形及成礦后壓剪脆性變形。圍巖蝕變主要受破頭青斷裂控制,在水平方向整體具有明顯的分帶性,自主斷裂向下盤方向蝕變帶總體為:斷層泥→黃鐵絹英巖→絹英巖→鉀化花崗巖→新鮮花崗巖的漸變趨勢。而由于受次級斷裂和節(jié)理裂隙影響,在局部地段出現(xiàn)蝕變疊加。依據(jù)各蝕變帶包含及穿插關(guān)系厘定蝕變時序為:鉀長石化→絹英巖化→黃鐵礦化→碳酸鹽化。依據(jù)質(zhì)量平衡分析,蝕變過程中:主量元素Si、K、Fe、Al元素主要為遷入,Na元素遷出;微量元素Ba、Sr、Cu和Ag表現(xiàn)活躍,其次為Au、Pb、Rb和Zn;其中Ba、Sr明顯遷出,Au元素與Cu、Pb、Rb、Zn均為遷入,表明多金屬硫化物與礦化作用同階段。礦化在水平方向上具有漸變規(guī)律,從主斷裂面近旁的擠壓片理帶至遠離斷面的節(jié)理帶,礦化類型也出現(xiàn)由破碎蝕變巖型礦化帶至多金屬硫化物脈型礦化帶變化。蝕變巖型礦化主要賦存于壓扭性的破頭青斷裂破碎帶內(nèi),而脈型礦化多發(fā)育在主斷裂下盤的次級張性、張扭性斷裂-節(jié)理帶中。斷裂-裂隙系統(tǒng)的多期次活動、不同部位的變性差異及其中對應成礦流體的輸運-反應-沉淀等的變化導致了蝕變-礦化多樣性及其網(wǎng)絡結(jié)構(gòu)的形成。
[Abstract]:At the junction of Luoshan gold deposit is located in the northwest of Linglong gold field in southern potouqing fault and nine Jiangjia fracture, is typical of the Linglong gold deposit of altered rock type gold deposit. In recent years, with the shallow middle has been mined, the deposit reserves fell sharply. The mineralization network is an important part of the metallogenic system applied to forecast the prospecting for gold deposits, more in-depth understanding, expand its reserves and prolong its service life, study the mineralization alteration of its network structure, deep prospecting work in the service of the deposit. The deposit and geological observation system based on data mining, the Luoshan gold deposit control the ore structure, alteration and mineralization network structure were studied. The gold deposits of Luoshan mainly controlled by faults, potouqing fault and secondary ore controlling faults or fissures respectively controlled altered rock type ore bodies and polymetallic sulfide vein type ore body The morphology and occurrence. Ore controlling fracture has experienced four stages of evolution: the early deformation of ductile shear deformation before mineralization of ductile brittle shear deformation, tensile shear deformation and brittle mineralization mineralization after shear brittle deformation. Wall rock alteration is mainly affected by the potouqing fault control has obvious zonation in the horizontal direction. Independent fracture to footwall alteration zone for the overall direction: the gradual trend of fault gouge, pyrite sericite quartz rock, phyllic, potassic granite to fresh granite. Due to secondary faults and fissures, appear superimposed alteration in the local area. On the basis of the alteration zone contains and define the relation between alteration with timing for potash feldspathization, sericitization, pyritization and carbonatization. Based on the analysis of the mass balance, the alteration of the main elements: Si, K, Fe, immigration elements are mainly Al, Na elements from; trace elements Ba, Sr, Cu and Ag showed active, followed by Au, Pb, Rb and Zn; Ba, Sr were moved out, Au element and Cu, Pb, Rb, Zn were moved, that polymetallic sulfide mineralization and mineralization stage. The same has change rule in the horizontal direction, near surface compressional schistosity belt to far away from the joint section from the main fracture zone, mineralization types are also by the altered rock type mineralization belt to metal sulfide vein type mineralization changes. The altered rock type mineralization occurs mainly in the potouqing shear fracture zone, secondary tensile and vein type mineralization in the development of the main fault footwall, joint transtensional fault zone fault -. Fracture system multi period activities, and the degeneration of different position corresponding to the change of the ore-forming fluid transport reaction precipitation resulted in the formation of alteration and mineralization diversity and network structure.

【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】：2015
【分類號】：P618.51

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