發(fā)布時間：2018-05-03 19:17

  本文選題：滇東南寒武系 + 微細粒浸染型金礦　； 參考：《昆明理工大學》2015年碩士論文

【摘要】：水合口金礦位于富寧縣田蓬鎮(zhèn),屬滇黔桂“金三角”之西南角。自上世紀90年代以來在滇東南地區(qū)發(fā)現(xiàn)了多處微細粒浸染型金礦,顯現(xiàn)出了良好的找礦前景。近年來,隨著滇東南微細粒浸染型金礦勘查和開發(fā)的力度不斷加強,地表礦、淺部礦、易識別礦或者說已探明的泥盆系、三疊系和二疊系主要賦礦層位區(qū)的礦日益減少,金礦勘查正向?qū)ふ译[伏礦、深部礦、難識別礦或特殊景觀區(qū)、其它含礦層位的方向轉(zhuǎn)變。成礦理論對找礦工作的指導日益突出,勘查技術(shù)方法在找礦中起著關(guān)鍵作用,化探數(shù)據(jù)處理方法及意義越來越大。盡管如此,滇東南寒武系微細粒浸染型金礦的研究程度依舊較低。本文是在滇東南地區(qū)分布廣泛、厚度巨大的寒武系中指定區(qū)域內(nèi)尋找金礦的一次嘗試�；陬A測區(qū)研究程度較低,本文在收集大量區(qū)域成礦背景資料的基礎上,以構(gòu)造為主線,以區(qū)域成礦學、遙感地質(zhì)為理論指導,以研究生期間在文山—西疇Au-As-Sb-Cu-Pb-Zn成礦帶中找礦實踐為基礎,通過總結(jié)對比區(qū)內(nèi)典型微細粒浸染型金礦地質(zhì)特征、控礦要素和成礦規(guī)律,得出斷裂是微細粒浸染型金礦的首要重要的控礦因素；由于預測區(qū)處于巖溶景觀區(qū)的特殊環(huán)境,斷裂構(gòu)造往往隱伏難以識別,因此本文在前人的基礎上使用ETM+遙感影像對區(qū)域性斷裂進行解譯,在前人的基礎上加深本區(qū)在區(qū)域上構(gòu)造分級控礦方面的認識,并發(fā)現(xiàn)區(qū)內(nèi)金礦、地層、巖體的分布均受構(gòu)造控制。在針對礦區(qū)地質(zhì)進行研究過程中,本文通過遙感+野外調(diào)查的技術(shù)手段快速提取預測區(qū)構(gòu)造信息；在詳細的野外地質(zhì)調(diào)查基礎上,使用DEM高程模型和OLI遙感影像提取預測區(qū)線狀構(gòu)造,并使用主成分分析法提取鐵染蝕變,并從中間接獲取斷裂構(gòu)造信息；由于預測區(qū)以往地質(zhì)工作幾乎為空白,找礦標志不明顯,因此在該區(qū)實施了17.30kmm2的1：1萬土壤地球化學,并使用傳統(tǒng)統(tǒng)計學方法和奇異性分析法提取土壤地球化學異常,發(fā)現(xiàn)土壤地球化學異常的空間分布、分帶性和濃集中心等特征均嚴格受構(gòu)造控制；通過對“地、化、遙”所提取的成礦信息綜合歸并,從而圈定找礦靶區(qū),最后在有利的構(gòu)造部位進行查證,經(jīng)查證發(fā)現(xiàn)并圈定礦體一個,印證了本次工作的有效性和針對性。本文取得的認識與成果主要如下：1.滇東南微細粒浸染型金礦的構(gòu)造分級控礦特征明顯,已發(fā)現(xiàn)的大—中型礦床均產(chǎn)出于深大斷裂邊界附近,預測區(qū)位于廣南—富寧深大斷裂、文山—麻栗坡深大斷裂圍成的文山—富寧構(gòu)造成礦帶內(nèi)。通過對區(qū)內(nèi)典型礦床的對比研究認為,微細粒浸染型金礦的賦礦圍巖不具專屬性,各時代地層、巖漿巖中均有不同程度金礦產(chǎn)出,不純的碳酸鹽巖+有利的斷裂構(gòu)造是有利的成礦部位。2.受廣南—富寧斷裂和文山—富寧弧形構(gòu)造帶的共同影響,預測區(qū)附近的斷裂以北西向為主。預測區(qū)有兩條區(qū)域性大型斷裂切過,均為北西向斷裂,分別為普陽斷裂和木來斷裂,這兩條斷裂形跡基本平行于廣南—富寧斷裂,且穿過文山—富寧弧形構(gòu)造帶的中部和尾部,是為預測區(qū)的主控構(gòu)造；預測區(qū)出露地層以寒武系中統(tǒng)為主,巖性以碳酸鹽巖—細碎屑巖組合為主,屬于有利的賦礦巖性。預測區(qū)北東方向約14kmm有一大型金礦—革檔金礦,但是預測區(qū)的以往工作程度一片空白；3.采用地質(zhì)填圖、遙感地質(zhì)的方法手段快速提取預測區(qū)斷裂構(gòu)造信息,由于預測區(qū)以往地質(zhì)工作幾乎為一片空白,因此使用土壤地球化學測量提取礦化信息,并分別使用傳統(tǒng)方法和奇異性分析法圈定土壤地球化學異常。綜合“地化遙”數(shù)據(jù)大膽預測,圈定找礦靶區(qū)。通過初步查證,已發(fā)現(xiàn)金礦體一個,印證了構(gòu)造是本區(qū)微細粒浸染型金礦的首要重要的控礦因素,后續(xù)驗證工程正在展開�；凇邦A測→查證→補充→預測”的科學找礦原則,筆者針對該礦體進行了詳細的工作,認為構(gòu)造是首要控礦因素。通過節(jié)理統(tǒng)計和地應力復原得出,該礦體周圍的巖石首先受到NW-SE向的主壓應力產(chǎn)生張性的NW向斷層,之后受到近EW向的主壓應力擠壓改造。
[Abstract]:In recent years , as the exploration and exploitation of fine - grained disseminated gold deposits in Southeast Yunnan have been strengthened continuously , the exploration and development of gold deposits in Southeast Yunnan have been strengthened .
Because the prediction area is in the special environment of karst landscape area , the fault structure is often hidden and difficult to identify . Therefore , based on the former , this paper interprets the regional faults by using the remote sensing image , and finds out that the distribution of gold deposit , stratum and rock mass in the area is controlled by tectonic control . In the process of studying the geology of the mining area , this paper extracts the tectonic information of the prediction area quickly through the technical means of remote sensing + field investigation .
Based on the detailed field geological survey , the DEM elevation model and OLI remote sensing image are used to extract the linear structure of the prediction area , and the main component analysis method is used to extract the iron stain alteration , and the fault structure information is acquired indirectly .
Since the previous geological work of the prediction area is almost blank , the prospecting mark is not obvious , therefore , 1 : 10000 soil geochemistry of 17.30 kmm2 is implemented in this area , and the geochemical anomalies of soil are extracted by using the traditional statistical method and the singularity analysis method , and the spatial distribution , the zoning and concentration centers of the soil geochemical anomalies are found to be strictly controlled by the structure ;
According to the comparative study of the typical deposits in the area , it is found that there are two regional large fractures in the south - southeast of Yunnan .
The outcropped strata in the prediction area are mainly Cambrian series , and the lithology is dominated by carbonate - fine clastic rock combination , which belongs to the favorable ore - bearing lithology . The prediction area is about 14kmm in the north - east direction of the prediction area , which has a large - scale gold deposit - leaya gold deposit , but the previous work degree of the prediction area is blank ;
3 . The geological mapping and remote sensing geology method are adopted to quickly extract the fault structure information of the prediction area . Because the previous geological work of the prediction area is almost blank , the geochemical anomaly of the soil is determined by using the traditional method and the singularity analysis method . Based on the prediction 鈫，

本文編號：1839749