本文關鍵詞： 礦床成因 找礦預測 地球化學特征 大尹格莊金礦 膠東　出處：《東華理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：膠東0.3%的國土面積卻占有中國25%的黃金儲量。絕大多數(shù)的金礦床發(fā)育在招平、焦家及三山島三條成礦斷裂帶上。近年來,隨著國民經(jīng)濟發(fā)展的需要,對黃金的需求量逐年加大,各大礦山企業(yè)不斷開采生產(chǎn),許多礦山面臨著資源短缺。前人對該斷裂帶北段、南段開展過大量的野外地質調查及科學研究工作,而中段的研究程度相對較低。本文通過全面收集、整理和分析前人的研究資料,選擇大尹格莊金礦井下切穿礦體上下盤的剖面為實例,系統(tǒng)的采取巖石樣品,開展詳細的巖相學、主微量元素分析等研究,通過對礦床地質特征、各個蝕變巖帶巖石中元素的遷移富集規(guī)律、圍巖蝕變地球化學特征進行詳細的研究,總結招-平斷裂帶中段金礦床基本控礦特征,探討礦床成因,在以上基礎上選取招平斷裂帶中段作為研究區(qū)進行構造蝕變巖相填圖和典型剖面的測量,劃分構造蝕變巖帶,確定蝕變標志,進行找礦預測。以期為下一步找礦提供科學線索。通過以上研究得出以下認識:(1)大尹格莊金礦嚴格受地層、巖漿巖、構造和圍巖蝕變的共同控制,礦體產(chǎn)出于主斷裂下盤的蝕變玲瓏花崗巖中,上盤圍巖為太古代膠東群變質巖。鉀長石化、硅化和黃鐵絹英巖化與金礦化關系密切。(2)大尹格莊金礦床各構造蝕變帶不同蝕變強度的蝕變巖中常量元素遷移規(guī)律明顯,說明了蝕變與礦化作用導致常量元素向礦體遷移富集。與大尹格莊金礦金礦化最為密切的是Fe2O3,K2O,Si O2,Ca O。REE的總量很高,輕、重稀土分異的現(xiàn)象較為明顯,總體上可見輕稀土富集,配分曲線呈右傾型。Eu,Ce負異常較為明顯。從斷裂帶弱蝕變至強蝕變過程中,ΣREE,LREE和HREE均有明顯降低,且相應特征值表現(xiàn)出規(guī)律性的變化。Au與Ag,Bi,Cu,Hg,Zn的相關系數(shù)較高,Au-Ag-Bi-As-Cu-Hg-Ni-Pb-W-Zn是金成礦密切相關的指示元素組合。(3)大尹格莊金礦流體包裹體類型較多,且成礦溫度總體分布在137℃-455℃區(qū)間內,流體類型總體為中溫、中低鹽度的Na Cl-H2O-CO2體系。(4)通過總結歸納前人硫同位素及氫氧同位素研究成果顯示:大尹格莊金礦成礦物質不具深部硫特征。成礦流體以幔源初生水、巖漿流體及大氣降水為主,并有少量變質水的加入。(5)通過地質填圖及實測剖面得出:斷裂面上下盤蝕變帶寬度不一,總體特征表現(xiàn)為上盤寬度小于下盤寬度,且上下盤蝕變強度和破碎強度不一致,總體特征為下盤強于上盤。主斷裂具明顯的分帶特征,巖石分帶為:斷層泥→黃鐵絹英巖→絹云母化花崗巖→鉀長石化花崗巖→弱片麻狀含黑云母二長花崗巖→正�；◢弾r;蝕變分帶為未蝕變膠東群老地層→鉀長石化→絹英巖化、硅化、黃鐵礦化→鉀長石化→未蝕變玲瓏花崗巖。根據(jù)野外填圖的資料及樣品的測試分析,提出招遠城南后疃西至道頭鎮(zhèn)西區(qū)段為成礦遠景區(qū)。
[Abstract]:The land area of Jiaodong 0.3% accounts for 25% gold reserves in China. The vast majority of the gold deposits are developed in Zhaoping, Jiaojia and Sanshandao three ore-forming fault zones. In recent years, with the development of the national economy, the demand for gold has increased year by year. The major mining enterprises are constantly mining and producing, and many mines are facing a shortage of resources. The forefathers carried out a large number of field geological surveys and scientific research work on the northern and southern sections of the fault zone. The research level in the middle section is relatively low. Through collecting, arranging and analyzing the previous research data, this paper chooses the section of the upper and lower face of downhole cut ore body in Dayingezhuang Gold Mine as an example, and systematically adopts the rock sample. Through detailed petrography, principal and trace element analysis and so on, the geological characteristics of the deposit, the migration and enrichment of elements in the rocks of each altered rock belt, and the alteration geochemical characteristics of surrounding rock are studied in detail. This paper summarizes the basic ore-controlling characteristics of gold deposits in the middle section of the Zhao-Ping fault zone and discusses the genesis of the deposits. On the basis of the above, the middle section of the Zhaoping fault zone is selected as the study area to carry out structural alteration lithofacies mapping and typical profile survey, and to divide the structural altered rock belts. In order to provide scientific clues for the next prospecting, it is concluded that the Dayingezhuang gold deposit is strictly controlled by strata, magmatic rocks, structures and wall rock alteration through the above study. The orebody occurs in the altered Linglong granite in the lower face of the main fault, and the surrounding rock of the upper wall is the metamorphic rock of the Archean Jiaodong Group. The relationship between silicification and Huangtieranite is closely related to gold mineralization. (2) the law of the migration of major elements in alteration rocks with different alteration strength in each structural alteration zone of Dayingezhuang gold deposit is obvious. The results show that alteration and mineralization lead to the migration and enrichment of major elements to orebody, and the gold mineralization is most closely related to the gold mineralization in Dayingezhuang gold deposit. The total amount of Fe _ 2O _ 3K _ 2O _ K _ 2O _ 2 O _ 2O _ 2 Ca O. REE is very high, the phenomenon of light and heavy rare earth differentiation is obvious, and light rare earth enrichment can be seen on the whole. The partition curve shows the negative anomaly of right-dip type. The 危 REE LREE and HREE decrease obviously from the weak alteration to the strong alteration in the fault zone. The corresponding eigenvalues show regular variation. The correlation coefficient between au and AgAg-Bi-CuHg-Ni-Pb-W-Zn is higher than that of Ag-Ag-Bi-As-Cu-Hg-Ni-Pb-W-Zn, which is a closely related indicator element assemblage of gold mineralization. There are many fluid inclusions in Dayingezhuang gold deposit, and the metallogenic temperature is between 137 鈩，

本文編號：1494697