粵北南雄盆地鈾礦化特征及成礦規(guī)律分析
發(fā)布時(shí)間:2018-06-03 19:06
本文選題:粵北 + 南雄盆地; 參考:《東華理工大學(xué)》2015年碩士論文
【摘要】:南雄盆地鈾礦床、礦點(diǎn)、礦化點(diǎn)眾多,其鈾礦化類型和控礦因素復(fù)雜多樣。本文通過資料整理研究和地質(zhì)調(diào)查對(duì)比,將它們劃分為三種成因類型,即熱液型、沉積成巖型、淋積成巖型。依據(jù)不同成因類型,選取典型礦床(礦點(diǎn))進(jìn)行詳細(xì)野外地質(zhì)調(diào)查,系統(tǒng)研究盆地內(nèi)地層、構(gòu)造、圍巖蝕變、元素地球化學(xué)特征及它們與鈾成礦的關(guān)系。通過這些礦床,礦點(diǎn)礦化特征和控礦因素的分析,南雄盆地鈾礦化分布可歸納出如下規(guī)律:(1)盆緣和基底花崗巖的存在是鈾成礦的先決條件(2)控盆構(gòu)造的長(zhǎng)期,多次活動(dòng)是熱液鈾礦床成礦的重要因素(3)Ⅱ、Ⅲ級(jí)沉積韻律的中部(個(gè)別中下部)地層,是鈾礦化的有利層位。(4)山麓洪積相前緣巖相過渡帶是鈾成礦的有利地段(5)淺色層(體)是鈾成礦的最有利場(chǎng)所根據(jù)這三種成因類型的鈾成礦地質(zhì)特征和鈾成礦規(guī)律,預(yù)測(cè)了三級(jí)鈾成礦遠(yuǎn)景區(qū)。它們分別是:(1)Ⅰ級(jí)成礦遠(yuǎn)景預(yù)測(cè)區(qū)——238地區(qū)第一片:盆地內(nèi)238E礦床的南西方向的延伸地段,經(jīng)過近年來鉆探工作,已證實(shí)該片有較大發(fā)展遠(yuǎn)景;第二片:238W礦床36號(hào)勘探線以西地段,有很好的礦化苗頭,向西面深部礦化有變好的趨勢(shì);第三片:小煤窯地段,熱液活動(dòng)明顯,硅化、褪色化顯著,見有伽瑪異常點(diǎn);第四片:蒼石-周地地段,該地段構(gòu)造分枝明顯,成礦遠(yuǎn)景較好。(2)Ⅱ級(jí)成礦遠(yuǎn)景預(yù)測(cè)區(qū)——371地區(qū)位于始興縣城北面的羅圍—老黃塘—下俄井—馬市地段,面積約20km2,成礦地質(zhì)條件較好,初步探明的工業(yè)礦化面積0.43 km2、遠(yuǎn)景儲(chǔ)量**多噸、工業(yè)儲(chǔ)量**多噸,對(duì)成礦規(guī)律已有一定的認(rèn)識(shí),并掌握了一定的找礦線索,成礦遠(yuǎn)景良好。下俄井371礦點(diǎn)和的東田心-黃田地段,礦化埋藏較深,保存較好,稀疏工程揭露所見的礦層較多,以尋找富厚礦化的集中地段。(3)Ⅲ級(jí)成礦遠(yuǎn)景預(yù)測(cè)區(qū)——老虎頭—馬亂水地區(qū)老虎頭東側(cè)經(jīng)深部揭露查明有129號(hào)沉積型礦點(diǎn),構(gòu)造熱液活動(dòng)特征與234、238礦床類似,目前深部揭露和研究尚不充分,有必要對(duì)深部作進(jìn)一步的探索研究。熱液鈾礦床在成礦亞帶中是頗有發(fā)展遠(yuǎn)景的類型,也是我們今后工作的重點(diǎn),今后在南雄盆地的找礦方向,其主要目標(biāo)應(yīng)放在尋找熱液類型方面。除全安礦田本身的發(fā)展外,還要注意南雄硅化斷裂帶的上、下盤的含礦次級(jí)構(gòu)造的深部揭露。例如二三八礦床的36號(hào)勘探線以西地段,723硅化帶與樟樹寨斷裂的交接部位,馬亂水地區(qū)的北北東斷裂熱液活動(dòng)繁雜地段,在現(xiàn)有鈾礦化且物化探異常區(qū)的高場(chǎng)區(qū),進(jìn)行必要的深部探索,以求新區(qū)的開辟。
[Abstract]:There are many uranium deposits in Nanxiong Basin. The uranium mineralization types and ore-controlling factors are complex and varied. This paper classifies them into three genetic types, that is, hydrothermal type, sedimentary diagenetic type and leaching diagenetic type. According to different genetic types, typical deposits (ore points) are selected to carry out detailed field geological survey, and systematic study of the interior of the basin, structure, wall rock alteration, geochemical characteristics of elements and their relationship with uranium mineralization. By analyzing the mineralization characteristics and ore-controlling factors of these deposits, the distribution of uranium mineralization in Nanxiong Basin can be concluded as follows: the existence of granites in the margin and basement of the basin is the precondition for uranium mineralization. Multiple activities are important factors for metallogenic formation of hydrothermal uranium deposits (鈪,
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