本文選題：控礦構(gòu)造 + 礦化強(qiáng)度�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：膠東是我國(guó)主要的金礦集中區(qū)和黃金工業(yè)基地,三山島金礦是膠東典型的超大型“焦家式”金礦床,其礦床地質(zhì)研究程度較高,但在金品位分布規(guī)律及其與構(gòu)造配套的研究上比較薄弱。論文在詳細(xì)的野外地質(zhì)調(diào)查基礎(chǔ)上,運(yùn)用數(shù)字-尺度分形和多重分形方法,查明了三山島金礦床的控礦構(gòu)造,解析了三山島金礦礦化強(qiáng)度的影響因素,取得以下主要認(rèn)識(shí):成礦前,區(qū)域主壓應(yīng)力方位為NW向,三山島-倉上斷裂及其伴生的NE-NNE向斷裂主體呈壓性特征,NNE向的次級(jí)斷裂間連通性較差,流體活動(dòng)無運(yùn)移通道,礦體難以形成。成礦期,區(qū)內(nèi)的主應(yīng)力方向轉(zhuǎn)為近NE向,各斷裂發(fā)生近EW向伸展,此時(shí)也形成了近SN向延伸的張性斷裂,有利于流體活動(dòng),是主要的導(dǎo)礦和容礦構(gòu)造。成礦后,NW向的三山島-三元斷裂破壞了大量構(gòu)造和礦體。三山島金礦可劃分為四個(gè)成礦階段:Ⅰ黃鐵礦-絹英巖階段;Ⅱ金-石英-黃鐵礦-毒砂階段;Ⅲ金-石英-多金屬硫化物階段;Ⅳ石英-碳酸鹽階段。Ⅱ、Ⅲ階段為金主成礦階段,其中Ⅱ成礦階段中礦化沒有定向性,黃鐵礦以團(tuán)塊狀為主,Ⅲ成礦階段中多金屬硫化物主要呈脈狀,走向?yàn)楸睎|向或南北向。通過三山島金礦礦體參數(shù)的分布及礦化樣式統(tǒng)計(jì),將穿脈分為三個(gè)礦化等級(jí),分別為強(qiáng)烈礦化穿脈(例如:-465中段46號(hào)穿脈)、中等礦化穿脈(例如:-510中段54號(hào)穿脈)和微弱礦化穿脈(例如:-510中段51號(hào)穿脈)。在數(shù)字-尺度分形方法中,隨著礦化程度的加強(qiáng),閾值逐漸增大,分維值逐漸減小;在多重分形方法中,強(qiáng)烈礦化穿脈的多重分形譜線較中等礦化和微弱礦化穿脈分布范圍窄。應(yīng)用多重分形方法,計(jì)算得出譜寬Δα的值在強(qiáng)烈礦化穿脈(Ⅰ)中最小,中等礦化穿脈(Ⅱ)中中等,微弱礦化穿脈(Ⅲ)中最大,顯示強(qiáng)烈礦化穿脈的金品位分布最均勻,微弱礦化穿脈中金品位分布最不均勻。三山島金礦金品位分布符合分形和多重分形,在Ⅱ成礦階段,構(gòu)造上無統(tǒng)一方向,微裂隙較少,礦化主要受水巖反應(yīng)控制,金品位分布較為均勻;在Ⅲ成礦階段,構(gòu)造為強(qiáng)烈的伸展作用,導(dǎo)致微裂隙增加,使閾值增加,礦體受裂隙控制,金品位分布更為集中。
[Abstract]:Jiaodong is the main gold concentration area and gold industry base in China. Sanshandao gold deposit is a typical super large "Jiaojia" gold deposit in Jiaodong, which has a high degree of geological research. However, the study of gold grade distribution and its matching with the structure is relatively weak. On the basis of detailed field geological survey, using digital scale fractal and multifractal methods, the ore-controlling structure of Sanshandao gold deposit is found out, and the influencing factors of mineralization intensity of Sanshandao gold deposit are analyzed. The main results are as follows: before the mineralization, the principal compressive stress orientation of the area is NW direction, the main body of the Sanshando-Cangshang fault and its associated NE-NNE fault have poor connectivity between the secondary faults with the NNE direction, and there is no migration channel for the fluid activity. Ore bodies are difficult to form. During the metallogenic period, the principal stress direction in the area changed to near NE direction, and the faults extended in the near EW direction. At this time, the tensile faults extending in the near SN direction were formed, which is favorable to fluid activity and is the main ore-conducting and ore-containing structure. After mineralization, a large number of structures and orebodies were destroyed by the Sanshandao-ternary fault in NW direction. Sanshandao gold deposit can be divided into four metallogenic stages: 鈪，

本文編號(hào)：1928100