本文選題：上莊金礦　切入點：望兒山斷裂　出處：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：上莊礦區(qū)是膠東蠶莊金礦的主要礦區(qū),處于焦家金礦田東南緣。在區(qū)域地質(zhì)及礦床地質(zhì)背景方面與焦家金礦田各礦床相似,但也有其獨特之處。主要包括:(1)礦區(qū)位于焦家斷裂帶的次級斷裂—望兒山斷裂上,礦體嚴格受望兒山斷裂構(gòu)造多期變形控制;(2)恰好位于萊州-招遠整裝勘查區(qū)的兩大巖體,即玲瓏巖體和郭家?guī)X巖體接觸帶上;(3)雖然上莊礦區(qū)也為構(gòu)造控礦,但是其礦體主要分布于望兒山斷裂上盤,而著名的焦家金礦田礦體多位于斷層下盤;(4)焦家礦體多數(shù)金礦控礦構(gòu)造的上盤和下盤在巖相上差別較大,而上莊礦區(qū)的望兒山斷裂其上下盤巖相上相同或相似;(5)圍巖蝕變以硅化為主。本文結(jié)合高分辨率掃描電鏡和透射電鏡,對膠東上莊礦區(qū)主成礦期及成礦期后過程進行探討,著重開展了黃鐵礦演化期次、演化特征、金的賦存狀態(tài)以及微量稀土元素賦存狀態(tài)的研究。取得了如下一些認識:(1)焦家金礦田少有毒砂與金共生關(guān)系報道,但在上莊礦區(qū)發(fā)現(xiàn)金與毒砂關(guān)系密切,許多礦石中銀金礦普遍分布于毒砂與黃鐵礦接觸帶上;(2)上莊礦區(qū)礦石中Bi富集程度異常高,通過詳細的微區(qū)分析發(fā)現(xiàn)是因為黃鐵礦包裹或共生大量的碲鉍礦;(3)一些稀土元素含量的異常,是因為黃鐵礦中包裹有獨居石礦物顆粒,故上莊礦區(qū)在進行微量元素和稀土元素測試時,應將微區(qū)分析與濕化學方法結(jié)合。上莊金礦成礦過程中黃鐵礦及金的演化規(guī)律如下:初始黃鐵礦在成礦流體中結(jié)晶較快,形成顆粒粒徑小(一般小于20μm),特征晶型為八面體、五角十二面體及其聚晶的黃鐵礦,部分元素Au隨著黃鐵礦快速結(jié)晶成為不可見金;后期黃鐵礦經(jīng)歷了較強的熱液或變質(zhì)作用,黃鐵礦發(fā)生動態(tài)重結(jié)晶,顆粒形成港灣狀、鋸齒狀特征的邊界,該階段黃鐵礦顆粒粒徑較大(多為300~500μm);熱液或變質(zhì)作用使得黃鐵礦中的不可見金逐漸往外遷移;在高溫主導階段,黃鐵礦邊界趨向達到重新平衡,通過靜態(tài)重結(jié)晶作用形成“退火”結(jié)構(gòu),即互成120°的三節(jié)點邊界,重結(jié)晶恢復過程使黃鐵礦顆粒變小,粒徑多在50~100μm;隨著溫度降低,黃鐵礦晶內(nèi)裂隙和穿晶裂隙大量發(fā)育,為可見金的聚集提供了有利環(huán)境。
[Abstract]:Shangzhuang ore area is the main ore area of Jiaojia gold deposit, which is located in the southeast margin of Jiaojia gold field. The regional geology and geological background of the deposit are similar to those of each deposit in Jiaojia gold ore field. But it also has its own uniqueness. It mainly includes: the mining area is located on the secondary fault-Wangershan fault in the Jiaojia fault zone, and the orebody is strictly controlled by the multi-stage deformation of the Wangershan fault structure. The orebody is located in the two major rock masses in the Laizhou-Zhaoyuan integrated exploration area. Although the Shangzhuang ore area is also controlled by tectonics, the orebody is mainly distributed in the upper plate of Wangershan fault. However, the ore bodies of the famous Jiaojia gold ore field are mostly located at the lower side of the fault, and the upper and lower faces of most gold ore control structures of the Jiaojia ore body are quite different in lithofacies. But in Wangershan fault of Shangzhuang mining area, the alteration of surrounding rock is mainly silicification in the same or similar lithofacies of upper and lower face. Combining with high resolution scanning electron microscope and transmission electron microscope, the main metallogenic stage and post-metallogenic process of Shangzhuang ore area in Jiaodong are discussed in this paper. This paper focuses on the study of the stages, characteristics, occurrence of gold and the occurrence of trace rare earth elements of pyrite. Some understandings are obtained as follows: there are few reports on the symbiotic relationship between arsenopyrite and gold in Jiaojia gold ore field. However, in Shangzhuang ore area, the relation between cash and arsenopyrite is close, and the silver gold deposits in many ores are generally distributed in the contact zone of arsenopyrite and pyrite. Through detailed microanalysis, it is found that the anomalies of some rare earth elements are due to pyrite enclosing or symbiotic large amounts of tellurium bismuth), and because there are monazite mineral particles in pyrite. Therefore, microanalysis and wet chemical methods should be combined in the testing of trace elements and rare earth elements in Shangzhuang mine. The evolution of pyrite and gold in the metallogenic process of Shangzhuang gold deposit is as follows: the initial pyrite crystallizes rapidly in the ore-forming fluid. The formation of pyrite with small particle size (generally less than 20 渭 m), characterized by octahedron, pentagonal dodecahedron and polycrystalline pyrite, in which some elements au became invisible with the rapid crystallization of pyrite, and pyrite experienced strong hydrothermal or metamorphism in the late stage. Dynamic recrystallization occurs in pyrite, and the particles form the boundary of bays and serrated features. In this stage, the size of pyrite particles is larger (mostly 300 ~ 500 渭 m); hydrothermal or metamorphism makes the invisible gold in pyrite gradually migrate outward; at the stage of high temperature, The boundary of pyrite tends to rebalance. Through static recrystallization, a "annealing" structure is formed, that is, a three-node boundary of 120 擄. During the recrystallization recovery process, the pyrite particles become smaller, and the particle size is more than 50 ~ 100 渭 m, with the decrease of temperature. The large number of cracks and transgranular cracks in pyrite provide a favorable environment for the accumulation of visible gold.
【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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