本文關(guān)鍵詞：陜西省黃泥坪金礦床成礦規(guī)律研究　出處：《東華理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 金礦床 成礦地質(zhì)特征 礦床成因 黃泥坪 陜西

【摘要】：陜西寧強(qiáng)縣黃泥坪金礦區(qū)以陽(yáng)平關(guān)大斷裂為界分,地處南部的揚(yáng)子地塊北緣的后龍門山造山帶內(nèi),為典型的石英脈(柳樹坪礦段、石罐子礦段)、蝕變巖型(山關(guān)石礦段、漢樹溝礦段)金礦床。依托“陜西省寧強(qiáng)縣黃泥坪地區(qū)山關(guān)石—柳樹坪—漢樹溝—石罐子礦段金礦勘查”項(xiàng)目,以黃泥坪金礦為研究對(duì)象,對(duì)研究區(qū)的成礦地質(zhì)特征及成因進(jìn)行了詳細(xì)剖析;通過(guò)研究礦床地質(zhì)特征,分析礦體形成與地層、構(gòu)造、巖漿巖及圍巖蝕變之間的關(guān)系,探討黃泥坪金礦成礦地質(zhì)特征、控礦因素、成礦時(shí)代、成礦物質(zhì)來(lái)源、礦床成因,提出黃泥坪金礦成礦模式。本次研究工作取得以下認(rèn)識(shí):黃泥坪金礦石中金主要分布在毒砂及黃鐵礦之中,而黃鐵礦中微量元素Ni含量較低,Co/Ni比值一般在1-3之間,獨(dú)居石微粒中Ce2O3、La2O3含量均較高而Gd2O3含量較低,表明中低溫?zé)嵋航淮梢蛱卣髅黠@。黃泥坪金礦的控礦構(gòu)造不應(yīng)局限于是地層還是斷裂構(gòu)造,應(yīng)該統(tǒng)一看作能夠?yàn)槌傻V流體提供富集空間的部位。研究區(qū)成礦空間上受到逆沖構(gòu)造變形中期代產(chǎn)生的平移斷層的控制,并受到晚期構(gòu)造世代逆沖構(gòu)造變形的掩覆。礦體多為隱伏、半隱伏礦體。黃泥坪金礦四個(gè)礦段礦體形態(tài)、礦石類型、載金礦物、圍巖蝕變等特征相似,具有一定的親緣關(guān)系,是后龍門山造山帶燕山期成礦事件的結(jié)果。黃泥坪金礦應(yīng)為韌性剪切型金礦,成礦流體為基底火山巖經(jīng)韌性剪切作用活化而來(lái),礦區(qū)深部有存在盲礦體的可能。黃泥坪金礦成礦機(jī)理總結(jié)為:燕山期華北板塊與揚(yáng)子陸塊的陸陸碰撞發(fā)生由北向南的逆沖推覆,深部火山巖基底在韌性剪切作用下,使火山巖中金活化形成含金熱液,含金熱液沿著斷裂向上遷移,到弱酸性低級(jí)變質(zhì)的綠片巖相(沉積蓋層)中的有利部位富集成礦。且區(qū)內(nèi)金礦體中多含黃鐵礦、毒砂、黃銅礦、黝銅礦、板鈦礦、閃鋅礦及赤鐵礦以及次生氧化礦物褐鐵礦等顯示了中溫?zé)嵋旱V物組合特征,初步認(rèn)為該礦床成因應(yīng)為中溫?zé)嵋何g變巖型金礦床。
[Abstract]:Shaanxi Ningqiang County Wong Ping gold mine area to Yangpingguan fault as the boundary, the south is located in the northern margin of the Yangtze block of the Longmen orogenic belt, is a quartz vein (typical of the Liu Shuping ore section, stone pot ore section), altered rock type (Shan Guan ore section, Han Shu ditch mine). Relying on the "gold deposit in Ningqiang County in Shaanxi Province Huang Ni Ping Shan Guan Shi - ping area Chinese willow tree ditch - stone pot ore section gold exploration project, to Wong Ping gold mine as the research object, a detailed analysis of metallogenic characteristics and genesis of the study area; through the study of geological characteristics, formation and formation structural analysis, the relationship between magmatite orebody and wall rock alteration, investigate Huang Ni Ping gold metallogenic character, ore controlling factors, mineralization, genesis of ore forming material source, mineralization model, put forward Wong Ping. This study made the following understanding: Wong Ping gold in gold ore Mainly distributed in arsenopyrite and pyrite, pyrite and trace elements in low Ni Co/Ni ratio is generally between 1-3, Ce2O3 monazite, La2O3 content were higher and lower Gd2O3 content, indicating that the low temperature hydrothermal metasomatic characteristics. Ore controlling structure of yellow Dongping gold deposit should not be limited and stratum or fault construction should be unified as to provide space for the enrichment of ore-forming fluid parts. Mineralization of the area space controlled by strike slip fault thrusting deformation produced by the middle generation, and by the late tectonic generation thrusting deformation under. Ore bodies are mostly concealed, half concealed ore bodies. Morphology, Wong Ping gold mine four mine some types of ores, gold bearing minerals, rock alteration and other similar features, has a certain relationship, is after the Longmen orogenic belt in Yanshan metallogenic events. Wong Ping gold mine should be ductile shear Cut type gold deposit, the ore-forming fluid is the basement rock volcano by ductile shear activation to the deep mining area exist blind orebody may. Gold mineralization mechanism is summarized as Wong Ping Yanshan: North China and Yangtze Landmass collision occurred from north to South thrusting, deep volcano rock basement in toughness under shear, the volcano rock of gold bearing hydrothermal activation, hydrothermal gold upward migration along the fracture, to weak acidic low-grade metamorphic greenschist facies (sedimentary cover) favorable position in mineralization. The ore bodies and within the area containing pyrite, arsenopyrite, chalcopyrite, tetrahedrite, brookite. Sphalerite and hematite and limonite mineral secondary oxidation shows the mesothermal mineral assemblage, it is considered that the gold deposit of altered rock type gold deposit is a mesothermal alteration.

【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.51

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本文編號(hào)：1362107