發(fā)布時間：2018-02-23 16:54

  本文關(guān)鍵詞： 成礦構(gòu)造解析 構(gòu)造控礦規(guī)律 構(gòu)造控礦模型 找礦方向 樂紅-小河鉛鋅礦床　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：滇東北樂紅-小河鉛鋅多金屬礦床是近年來新發(fā)現(xiàn)的分布于川-滇-黔鉛鋅多金屬成礦區(qū)的的大型鉛鋅礦床之一,礦體產(chǎn)出嚴格受構(gòu)造控制。運用礦田地質(zhì)力學(xué)的理論與方法,通過大比例尺構(gòu)造剖面的精測及構(gòu)造控礦作用的研究,進行典型成礦構(gòu)造幾何學(xué)、運動學(xué)、力學(xué)、構(gòu)造巖、構(gòu)造期次等特征的精細解析,重點進行構(gòu)造形跡力學(xué)性質(zhì)的鑒定和礦田構(gòu)造體系的劃分。在此基礎(chǔ)上,分析了控礦構(gòu)造型式,確立成礦構(gòu)造體系,總結(jié)了構(gòu)造控礦規(guī)律,進而探討了構(gòu)造控礦作用機制,建立構(gòu)造控礦模式,指出找礦勘查方向。論文取得了以下主要成果和認識:1.樂紅-小河鉛鋅礦區(qū)構(gòu)造發(fā)育,具有多期構(gòu)造活動的特征,以近SN向的渭姑背斜為主的褶皺與NE向巧家-蓮峰斷裂、樂馬廠斷裂為礦區(qū)內(nèi)高級別構(gòu)造,控制了礦田的分布,而樂紅斷裂控制了礦床的展布,旁側(cè)的拖曳褶皺以及次一級的斷裂構(gòu)造、層間斷裂帶斷裂帶控制了礦體(脈)的展布,反映了構(gòu)造的分級控礦作用,構(gòu)成了一套斷裂-褶皺-節(jié)理成礦構(gòu)造系統(tǒng);2.通過構(gòu)造形跡力學(xué)性質(zhì)鑒定,認為該礦床自加里東期以來主壓應(yīng)力方向主要經(jīng)歷了近 EW→NE45°-50°→NW50°-60°→NE45°-50°→近EW→近SN 的轉(zhuǎn)變過程,反映了 6期構(gòu)造活動,形成了 4種構(gòu)造組合。其中印支晚-燕山早期形成的NW向構(gòu)造帶構(gòu)成了該礦床的成礦構(gòu)造格架;3.構(gòu)造對礦床(體)的控制作用明顯,根據(jù)不同的礦體構(gòu)造與礦體的空間分布特征,確定出3種礦化樣式:1)靠近樂紅斷裂,礦體呈透鏡狀、塊狀;2)距斷裂稍遠的地段,礦體呈網(wǎng)脈狀、團塊狀,產(chǎn)于穿層構(gòu)造裂隙及層間斷裂帶中;3)遠離斷裂的地段,礦體呈脈狀、侵染狀產(chǎn)出,主要產(chǎn)于層間斷裂帶中;4.確定了樂紅斷裂與震旦系燈影組(Z2dn)中厚層狀中粗晶白云巖蝕變體的組合為礦床的成礦地質(zhì)體。并劃分出3類主要成礦結(jié)構(gòu)面:1)巖性界面成礦結(jié)構(gòu)面(Si-Ca面);2)構(gòu)造成礦結(jié)構(gòu)面;3)物理化學(xué)成礦結(jié)構(gòu)面,主要為Eh-pH成礦結(jié)構(gòu)面;5.研究總結(jié)了構(gòu)造控礦規(guī)律,建立了構(gòu)造控礦模式和4條找礦標(biāo)志,進一步提出樂紅斷裂與震旦系燈影組白云巖的蝕變體的接觸地帶、震旦系燈影組白云巖與寒武系筇竹寺組砂巖的界面部位是該礦床有利的找礦地段,并指出6個找礦遠景區(qū)。
[Abstract]:Lehong Xiaohe Pb-Zn polymetallic deposit in northeastern Yunnan is one of the large Pb-Zn deposits newly discovered in recent years. The orebody production is strictly controlled by tectonics. By studying the fine measurement of large scale structural profile and the study of tectonic ore-controlling action, the fine analysis of typical ore-forming structural geometry, kinematics, mechanics, tectonite, secondary tectonic period and so on is carried out. The mechanical properties of structural trace and the division of ore-field structural system are emphasized. On this basis, the ore-controlling structure pattern is analyzed, the ore-forming structure system is established, the rules of structural ore-controlling are summarized, and the mechanism of tectonic ore-controlling action is discussed. The paper has made the following main achievements and understanding: 1. The structure of Lehong Xiaohe lead-zinc ore area is developed and has the characteristics of multi-stage tectonic activity. The fold and NE direction Qiaojia-Lianfeng fault in Weinu anticline, near SN direction, the Lemachang fault is a high-grade structure in the mining area, which controls the distribution of ore field, while the Lehong fault controls the distribution of the deposit. The towed fold on the side and the secondary fault structure, the interlayer fault zone controls the distribution of the orebody (vein), which reflects the classification and ore-controlling action of the structure. A set of fault-fold-joint metallogenic structure system is formed. Through the identification of mechanical properties of structural trace, it is considered that the principal compressive stress direction of the deposit has mainly experienced near EW since the Caledonian period. 鈫扤E45 擄-50 擄. 鈫扤W50 擄-60 擄. 鈫扤E45 擄-50 擄. 鈫扤ear EW. 鈫扵he transition process of near SN reflects the tectonic activity of 6 periods. Four types of tectonic assemblages were formed. The NW trending tectonic belt formed in the late Indosinian and early Yanshanian periods formed the metallogenic framework of the deposit. According to the spatial distribution characteristics of different orebody structures and orebodies, it is determined that three mineralization styles: 1) near Lehong fault, lenticular ore bodies and 2 blocks are far away from the faults, orebodies are reticulated veins and lumps. The orebody occurs in vein and infective form in the area far away from the fault, occurring in the structural fissure and interlayer fault zone of the interlayer. The assemblage of Lehong fault and Z2dng (Sinian Dengying formation) is determined to be the ore-forming geological body of the deposit, and three types of main ore-forming structural plane: 1) lithologic interface have been divided. The ore-forming structural plane of Si-Ca (2) structure of ore-forming structure is 3) physico-chemical ore-forming structural plane. It is mainly Eh-pH ore-forming structure plane 5. The structural ore-controlling rules are studied and summarized, the tectonic ore-controlling model and four ore-prospecting indicators are established, and the contact zone between the Lehong fault and the altered dolomite of the Dengying formation of the Sinian system is further proposed. The interface between dolomite of Dengying formation of Sinian and sandstone of Qiongzhusi formation of Cambrian is a favorable ore prospecting area of the deposit.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.4

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