發(fā)布時(shí)間：2018-05-06 01:35

  本文選題：青海 + 五龍溝　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：五龍溝金礦大地構(gòu)造位置位于東昆侖中帶,昆北與昆中斷裂之間。礦區(qū)地層主要以下元古界金水口群和上元古界青白口系地層為主,礦區(qū)內(nèi)構(gòu)造十分發(fā)育,礦體嚴(yán)格受控于北西向韌性剪切帶內(nèi)及旁側(cè)北西-北北西向脆性斷裂。礦石類型主要為蝕變巖型金礦石,有少量石英脈型金礦石,金與毒砂、輝(鐵)銻礦、黃鐵礦關(guān)系密切,圍巖蝕變主要以硅化、絹云母化、黃鐵礦化、毒砂化為主。對(duì)巖(礦)石的微量元素進(jìn)行R型聚類和因子分析,結(jié)果顯示Au,Sb和As關(guān)系密切。R型聚類分析結(jié)果顯示Au元素和As元素、Sb元素之間呈顯著正相關(guān),其相關(guān)系數(shù)分別為0.905和0.62。因子分析結(jié)果表明,毒砂、輝(鐵)銻礦化階段是主要成礦階段。所以,含有的As元素和Sb元素的毒砂、輝(鐵)銻礦和As元素含量較高的黃鐵礦可以作為野外找礦指示標(biāo)志礦物。礦區(qū)內(nèi)主要出露中酸性巖漿巖,研究后認(rèn)為閃長(zhǎng)質(zhì)巖漿巖與成礦有直接的關(guān)系,花崗質(zhì)巖漿巖與金礦沒有明顯關(guān)系。閃長(zhǎng)質(zhì)巖漿巖為印支期侵入的結(jié)果,具有I型花崗巖特征,形成于火山弧的擠壓構(gòu)造環(huán)境,與金礦化關(guān)系密切。而花崗質(zhì)巖漿巖集中于晚加里東時(shí)期發(fā)生侵入活動(dòng),具有A型花崗巖特征,形成于加里東后造山作用的碰撞構(gòu)造環(huán)境,與金礦化沒有密切關(guān)系。硫、鉛同位素研究表明,成礦物質(zhì)主要來自于幔源,并混入部分殼源物質(zhì),說明其主要來自于深源,后在上升過程中萃取了地層礦物質(zhì)。成礦具體過程:晚加里東時(shí)期,洋殼向北俯沖閉合,沿俯沖碰撞帶形成一系列大型逆沖型韌性剪切帶,使得成礦流體活化。在華力西-印支早期,石炭紀(jì)開始出現(xiàn)的特提斯小洋盆向北俯沖,深熔作用發(fā)生,熔融巖漿攜帶流體、成礦物質(zhì)上升侵位。晚印支期進(jìn)入造山活動(dòng)晚期,地殼抬升、加厚,巖石圈發(fā)生拆沉、減薄,幔源巖漿底侵、殼-幔混合作用強(qiáng)烈,偏中性的巖漿攜帶成礦流體及成礦物質(zhì)發(fā)生遷移,萃取圍巖中大量成礦物質(zhì),在上升侵位過程中沿韌性剪切帶脆性斷裂帶處有物化條件的突變,沉淀成礦,后期在斷層泥又有金的次生富集。經(jīng)過研究對(duì)比,綜合分析五龍溝金礦床在大地構(gòu)造環(huán)境、成礦地質(zhì)條件、成礦物質(zhì)條件方面與Groves(1998)提出的造山型金礦類似,因此認(rèn)定五龍溝金礦床為造山型構(gòu)造蝕變巖亞型金礦床。
[Abstract]:The tectonic location of the Wulonggou gold deposit is located in the middle zone of East Kunlun, between the north of Kunlun and the fault of the middle of Kunlun. The strata of the mining area are mainly composed of the Proterozoic Jinshuikou Group and the Upper Proterozoic Qingbakou system. The ore bodies are strictly controlled by the NW ductile shear zone and the NNW trending brittle faults. The ore type is mainly altered rock type gold ore, there are a small amount of quartz vein type gold ore, gold and arsenopyrite, (iron) antimony ore, pyrite is closely related, the main alteration of surrounding rock is silicification, sericite, pyrite and arsenopyrite. The results of R cluster and factor analysis of trace elements in rock (ore) rocks show that there is a significant positive correlation between au element and as element Sb element, and the correlation coefficient is 0.905 and 0.62.The results show that there is a significant positive correlation between au element and as element Sb element. Factor analysis results show that arsenopyrite and iron (iron) antimony mineralization stage is the main metallogenic stage. Therefore, arsenopyrite, pyrite with high content of as and SB and pyrite with high content of as and SB can be used as indicator minerals for prospecting in the field. It is considered that diorite magma is directly related to mineralization, while granitic magmatic rock has no obvious relation with gold deposit. Diorite magmatic rocks are the result of Indosinian intrusions and have the characteristics of I-type granite formed in the compressional tectonic environment of volcanic arc and are closely related to gold mineralization. The granitic magmatic rocks are mainly intrusive during the late Caledonian period and have the characteristics of A-type granites formed in the collisional tectonic environment of post-Caledonian orogeny and have no close relationship with gold mineralization. The sulfur and lead isotopic studies show that the ore-forming materials are mainly derived from mantle source and mixed with some crustal materials, indicating that they are mainly derived from deep sources and then extracted during the rising process. During the late Caledonian period, the oceanic crust subducted northward and closed, forming a series of large thrust-type ductile shear zones along the subduction collision zone, which enabled the ore-forming fluid to be activated. In the early Varissian-Indosinian period, the Tethys small ocean basin began to appear in the Carboniferous and subducted northward. The melting-magma carried fluid and the ore-forming material was emplaced. In the late Indosinian period, the late Indosinian period entered the late orogenic period, the crust uplifted, thickened, the lithosphere desunk, thinned, mantle-derived magma undercut, the crust-mantle mixing was strong, and the neutral magma carried the ore-forming fluid and the ore-forming material for migration. A large number of ore-forming materials are extracted from the surrounding rock. In the process of rising emplacement, there are sudden changes in physicochemical conditions along the brittle fault zone along the ductile shear zone, precipitation and mineralization, and gold enrichment in the fault gouge at the later stage. Through research and comparison, it is analyzed that the gold deposit of Wulonggou is similar to the orogenic gold deposit proposed by Grovess1998in terms of geotectonic environment, ore-forming geological conditions and ore-forming mineral conditions. Therefore, Wulonggou gold deposit is considered as orogenic tectonic alteration rock subtype gold deposit.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

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本文編號(hào)：1850212