本文選題：構(gòu)造控礦　切入點：晚期脈巖　出處：《核工業(yè)北京地質(zhì)研究院》2015年碩士論文

【摘要】：論文在前人研究工作的基礎(chǔ)上,突出了斷裂構(gòu)造對區(qū)內(nèi)鈾成礦的影響,著重對斷裂構(gòu)造進行了野外地質(zhì)調(diào)研和室內(nèi)顯微構(gòu)造分析,大致查明了區(qū)內(nèi)主要斷裂的幾何學(xué)、運動學(xué)特征。通過本區(qū)古構(gòu)造應(yīng)力場、同構(gòu)造期脈巖和構(gòu)造樣式及穿插關(guān)系等的研究,分析了區(qū)內(nèi)主要斷裂的演化過程。利用斷裂帶內(nèi)構(gòu)造巖地球化學(xué)特征,大致闡明了區(qū)內(nèi)黃溪斷裂和成功坳斷裂物質(zhì)組分的遷移特征。結(jié)合深部鉆探工程獲得的鉆孔資料及近些年最新研究成果,對區(qū)內(nèi)斷裂活動時序與鈾成礦關(guān)系進行初步探討。通過兩年的研究工作,取得以下主要成果和認識:(1)高坪石寨地區(qū)分布著兩條較大規(guī)模的NNW向斷裂蝕變帶(6號帶和8號帶)及其次級斷裂,而不是幾組小規(guī)模的NNW向裂隙。其中,石寨地區(qū)6號帶西側(cè)250米處沿溝發(fā)育一條NNW向硅化帶,即8號帶,該條硅化帶與石寨地區(qū)近SN向鈾分量高值異常暈相吻合,具有較好的找礦前景。(2)高坪地區(qū)中部近SN向斷裂蝕變帶,即9號帶,該處構(gòu)造活動次序較為復(fù)雜,近SN向斷裂蝕變帶被NEE向黃溪次級斷裂錯斷,且產(chǎn)狀變化較大。(3)利用鋯石LA-ICP-MS U-Pb同位素定年法和晶質(zhì)鈾礦U-Pb同位素定年方法對高坪地區(qū)鉆孔揭露的細�；◢弾r脈進行“平行定年”。研究結(jié)果表明,該區(qū)大多數(shù)鉆孔揭露的細�；◢弾r脈形成于印支早期,而不是前人所認識的燕山晚期,并證實該區(qū)受印支期SN向擠壓構(gòu)造活動的影響。(4)結(jié)合野外地質(zhì)調(diào)查和室內(nèi)綜合分析成果,從三個方面分析了高坪地區(qū)斷裂構(gòu)造對鈾成礦的控制作用。①構(gòu)造活動序次對鈾成礦階段的控制,即礦液在不同構(gòu)造應(yīng)力場下運移的方向不同;②NEE向黃溪斷裂扭性構(gòu)造結(jié)構(gòu)面有利于礦液的運移與沉淀,后期若伴隨張性活動,更利于富大鈾礦體的形成;③近SN向斷裂力學(xué)性質(zhì)及運動方式因構(gòu)造應(yīng)力場的變化而改變,形成有利于鈾成礦的地段。最后,充分利用已有的各種地質(zhì)、物化探等資料,在野外綜合地質(zhì)調(diào)查的基礎(chǔ)上,預(yù)測黃溪斷裂帶東段深部、黃溪斷裂帶中段和石寨地區(qū)NNW向斷裂蝕變帶為鈾成礦有利遠景區(qū),建議開展鉆探揭露與查證工程。
[Abstract]:On the basis of previous research work, this paper highlights the influence of fault structure on uranium mineralization in the area, and focuses on the field geological investigation and indoor microstructural analysis of the fault structure, and roughly finds out the geometry of the main faults in the area. Based on the study of paleotectonic stress field, dike rock and tectonic style and intercalation relationship in the same tectonic period, the evolution of major faults in this area is analyzed. The geochemical characteristics of tectonite in the fault zone are used. The migration characteristics of material components of Huangxi fault and Chengde depression in this area are described, combined with the drilling data obtained from deep drilling projects and the latest research results in recent years. The relationship between the sequence of fault activity and uranium mineralization in this area is discussed. Two large scale NNW trending fault-alteration zones (zone 6 and zone 8) and their secondary faults are distributed in the Gaoping Shizhai area, instead of several small scale NNW trending fissures. In Shizhai area, a NNW silicification zone is developed along the gully 250m to the west of the No. 6 belt in Shizhai area. The silicification zone coincides with the high value anomaly halo of uranium in the near SN direction in Shizhai area. In the middle of Gaoping area, near SN trending fault alteration zone, I. e., zone 9, where the sequence of tectonic activity is more complicated, the near SN trending fault alteration zone is faulted by NEE direction Huangxi secondary fault. LA-ICP-MS U-Pb isotopic dating method of zircon and U-Pb isotopic dating method of crystalline uranium ore are used to determine the "parallel dating" of granitic veins exposed by boreholes in Gaoping area. Most of the fine-grained granite veins exposed by boreholes in the area were formed in the early Indosinian period rather than in the late Yanshanian known by previous people, and it is confirmed that this area was influenced by the SN compressional tectonic activity in the Indosinian period. From three aspects, the controlling effect of fault structure on uranium mineralization in Gaoping area is analyzed. 1 the control of tectonic activity order on uranium metallogenic stage is analyzed. In other words, the direction of migration of ore fluid under different tectonic stress fields is different. The torsional structural plane of Huangxi fault is favorable to the migration and sedimentation of ore fluid, and if it is accompanied by tensional activity in the later stage, It is more favorable for the formation of large uranium orebodies to change the mechanical properties and movement patterns of the near SN direction faults due to the change of tectonic stress field, and to form a favorable uranium metallogenic area. Finally, the available geological, geophysical and geochemical exploration data are fully utilized. On the basis of comprehensive geological investigation in the field, it is predicted that the deep part of the eastern section of the Huangxi fault zone, the NNW trending fault alteration zone in the middle section of the Huangxi fault zone and the Shizhai area are favorable areas for uranium mineralization. It is suggested that the project of drilling disclosure and verification should be carried out.
【學(xué)位授予單位】：核工業(yè)北京地質(zhì)研究院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.14;P548

【參考文獻】

相關(guān)期刊論文 前10條

1 劉亮明,彭省臨,吳延之;湘東北地區(qū)脈型金礦床成礦構(gòu)造特征及構(gòu)造成礦機制[J];大地構(gòu)造與成礦學(xué);1997年03期

2 柏道遠;馬鐵球;王先輝;張曉陽;陳必河;;南嶺中段中生代構(gòu)造-巖漿活動與成礦作用研究進展[J];中國地質(zhì);2008年03期

3 鄧平,舒良樹,譚正中;諸廣—貴東大型鈾礦聚集區(qū)富鈾礦成礦地質(zhì)條件[J];地質(zhì)論評;2003年05期

4 毛景文;謝桂青;郭春麗;袁順達;程彥博;陳毓川;;華南地區(qū)中生代主要金屬礦床時空分布規(guī)律和成礦環(huán)境[J];高校地質(zhì)學(xué)報;2008年04期

5 舒良樹,鄧平,王彬,譚正中,余心起,孫巖;南雄-諸廣地區(qū)晚中生代盆山演化的巖石化學(xué)、運動學(xué)與年代學(xué)制約[J];中國科學(xué)(D輯:地球科學(xué));2004年01期

6 梁華英;伍靜;孫衛(wèi)東;莫濟海;黃文婷;;華南印支成礦討論[J];礦物學(xué)報;2011年S1期

7 任紀舜,陳廷愚,劉志剛,牛寶貴,劉鳳仁;華南大地構(gòu)造的幾個問題[J];科學(xué)通報;1986年01期

8 國坤;;中國華南地區(qū)中生代大規(guī)模成礦作用及其成因初探[J];科技信息;2012年31期

9 童航壽;;地幔柱構(gòu)造研究概述[J];鈾礦地質(zhì);2009年04期

10 張善果;黃國龍;沈渭洲;伏順成;王小冬;許麗麗;;諸廣山南部白云巖體巖石地球化學(xué)特征及成因[J];鈾礦地質(zhì);2011年05期

相關(guān)博士學(xué)位論文 前1條

1 王國富;陜西雙王金礦床構(gòu)造成礦作用及成礦預(yù)測研究[D];中南大學(xué);2006年

，

本文編號：1682154