本文選題：百順鈾礦田 + 構(gòu)造應(yīng)力場�。� 參考：《東華理工大學(xué)》2016年碩士論文

【摘要】：通過百順礦田主要成礦構(gòu)造野外露頭蝕變構(gòu)造巖觀察、鉆孔巖心構(gòu)造巖觀察、脈體和膠結(jié)物穿插關(guān)系的分析,系統(tǒng)地劃分了它們的活動期次。在野外對研究區(qū)內(nèi)各不同時代巖體和斷裂帶中的節(jié)理和擦痕滑動面進行了大量觀測和分析,共獲得26個節(jié)理統(tǒng)計點配套的64組次生共軛節(jié)理和50余組節(jié)理面或斷裂面擦痕矢量數(shù)據(jù),主要利用共軛剪節(jié)理法和擦痕矢量數(shù)據(jù)反演法,通過吳氏網(wǎng)分析和計算機軟件計算,反演三維點應(yīng)力狀態(tài)。將研究區(qū)的構(gòu)造應(yīng)力場劃分為4個期次,結(jié)合區(qū)域構(gòu)造演化和礦區(qū)地質(zhì)特征,探討了各期次構(gòu)造應(yīng)力場與鈾成礦作用關(guān)系。主要取得以下幾點結(jié)論和認識。(1)NE向區(qū)域?qū)УV和控礦斷裂構(gòu)造早期主要為左行壓扭構(gòu)造,形成了磨圓度較好的碎裂巖;中期為2~3次的NW-SE向伸展正斷作用,形成張性角礫巖,伴隨有多期次灰白色—紅色或雜色的玉髓膠結(jié);晚期斷裂面擦痕和階步顯示右行壓扭特征,形成未膠結(jié)或膠結(jié)不好的斷層泥和斷層泥礫。近SN向的儲礦和容礦構(gòu)造總體經(jīng)歷了早期張扭性和晚期張性兩次主要構(gòu)造活動,早期局部有一定磨圓度的角礫顯示張扭性特征;晚期張性構(gòu)造活動控制了帶內(nèi)鈾礦化產(chǎn)出。(2)百順鈾礦田地區(qū)先后至少經(jīng)歷了NW-SE向近水平構(gòu)造擠壓作用、近SN向近水平的構(gòu)造擠壓作用、NW-SE向伸展構(gòu)造作用和近EW向近水平的構(gòu)造擠壓作用4期構(gòu)造應(yīng)力場作用。早期NW-SE向擠壓構(gòu)造作用對應(yīng)為燕山早期(晚侏羅世)的擠壓構(gòu)造事件;近SN向擠壓構(gòu)造作用對應(yīng)為燕山晚期(早晚白堊世之交時期)的擠壓構(gòu)造事件;NW-SE向伸展構(gòu)造作用對應(yīng)為燕山晚期(晚白堊世)的伸展構(gòu)造事件;晚期近EW向擠壓構(gòu)造作用對應(yīng)為喜山期的擠壓構(gòu)造事件。(3)在NW-SE向擠壓構(gòu)造作用下,產(chǎn)生的NE向區(qū)域性斷裂等為后期區(qū)內(nèi)鈾成礦提供了必要的構(gòu)造通道條件;在近SN向擠壓構(gòu)造作用下,區(qū)內(nèi)NE向斷裂構(gòu)造產(chǎn)生左行壓扭,派生了一系列近SN向張性構(gòu)造,并使得近SN向構(gòu)造產(chǎn)生早期張扭活動,為成礦期含鈾熱液富集成礦提供了有利條件;NW-SE向伸展構(gòu)造作用,使區(qū)域性NE向斷裂產(chǎn)生拉張,近SN向斷裂產(chǎn)生晚期的再次拉張,該期導(dǎo)通斷裂深部的構(gòu)造和流體作用是形成區(qū)內(nèi)鈾礦化的最重要階段;近EW向擠壓構(gòu)造作用可能對早已期形成的鈾礦化產(chǎn)生破壞或改造作用。(4)牛瀾斷裂帶是區(qū)域性的控礦構(gòu)造,也為導(dǎo)礦、儲礦構(gòu)造;次級煙筒嶺斷裂是區(qū)內(nèi)主要導(dǎo)礦構(gòu)造,也為儲礦構(gòu)造;更次一級的近SN向張性構(gòu)造是區(qū)內(nèi)最主要的儲礦構(gòu)造。近SN向構(gòu)造遭受了多次張性構(gòu)造活動,使其成為區(qū)內(nèi)鈾成礦最有利的構(gòu)造部位,可作為區(qū)內(nèi)下一步鈾礦勘查找礦的主攻方向。
[Abstract]:Based on the observation of the main ore-forming structures in the Baishun Orefield, the observation of the outcrop altered tectonics in the field, the observation of the tectonic rocks in the borehole core, and the analysis of the relationship between the veins and the cementation, the active periods of the main ore-forming structures are systematically divided.In the field, a large number of joint and scratch sliding surfaces of rock masses and fault zones in different ages in the study area were observed and analyzed.A total of 64 groups of secondary conjugate joints and more than 50 sets of scratch vector data of joint or fault surface were obtained from 26 statistical points of joint. The method of conjugate shear joint and the inversion method of scratch mark vector data were mainly used, and the analysis of Wu's net and the calculation of computer software were carried out.Inversion of three dimensional point stress state.The tectonic stress field in the study area is divided into four periods. The relationship between the tectonic stress field and uranium mineralization is discussed in combination with the regional tectonic evolution and the geological characteristics of the mining area.The main conclusions and understandings are as follows: the early stage of the ore-conducting and ore-controlling faults in the NE trending area is mainly left-lateral compression-torsional structure, which formed a good grinding roundness of clastic rock, and the NW-SE extensional positive fault in the middle stage of 2 times, resulting in tensional breccia, is the main one in the early stage of the ore-controlling fault structure.The grayish-red or variegated chalcedony cementation is accompanied by several phases, and the late fracture surface marks and steps show the characteristics of right-line compression and torsion, resulting in uncemented or poorly cemented fault gouges and gouge.The ore-storage and ore-bearing structures in the near SN direction generally experienced two main tectonic activities: the early tension-torsion and the late tensionality, and the early local breccia showed the characteristics of tension-torsion with a certain degree of grinding roundness.The late tensional tectonic activity controlled uranium mineralization in the belt.The NW-SE extensional tectonics and the near-EW near-horizontal tectonic compressions in the near SN direction of tectonic compressions are responsible for the tectonic stress field in the fourth stage.The early NW-SE compressional tectonics correspond to the early Yanshanian (late Jurassic) compressional tectonic events.The NW-SE extensional tectonic event corresponds to the late Yanshanian (late Cretaceous) extensional tectonics. The NW-SE extensional tectonic event corresponds to the late Yanshanian (late Cretaceous) extensional tectonic event.The late EW compressional tectonics correspond to the compressional tectonic event of the Himalayan period. Under the action of NW-SE compressional tectonics, the NE trending regional faults provide the necessary tectonic channel conditions for uranium mineralization in the late area.Under the action of the near SN compression structure, the NE trending fault structure in the area produces a series of near SN trending tensional structures, resulting in the early tensional activity of the near SN trending structures.This provides favorable conditions for the enrichment and mineralization of uranium-bearing hydrothermal solution during the metallogenic period, resulting in the extension of regional NE trending faults and the reextension of the late stage of the near SN trending faults, and the NW-SE extensional tectonics.The tectonic and fluid processes in the depth of the conducting fault are the most important stage of uranium mineralization in this area, and the near EW compressional tectonism may destroy or transform the uranium mineralization formed in the early period. The Niulan fault zone is a regional ore-controlling structure.The sub-Yanchongling fault is the main ore-conducting structure in the area and is also the ore-storage structure, and the next order near-SN tensional structure is the most important ore-storage structure in the area.The near SN trending structure has been subjected to many tensional tectonic activities, which makes it the most favorable tectonic position for uranium mineralization in this area, and can be regarded as the main direction of uranium exploration and prospecting in this area.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P619.14

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