本文選題：成礦構(gòu)造解析 + 成礦構(gòu)造體系　； 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：滇西北北衙金多金屬礦床是西南三江多金屬成礦帶新生代斑巖成礦系統(tǒng)的典型礦床,是近些年來取得重大找礦突破形成的超大型金多金屬礦床。運(yùn)用礦田地質(zhì)力學(xué)的理論和方法,通過大比例尺構(gòu)造剖面精測,進(jìn)行典型成礦構(gòu)造幾何學(xué)、運(yùn)動(dòng)學(xué)及構(gòu)造巖特征解析,重點(diǎn)進(jìn)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)上分析控礦構(gòu)造型式,確立成礦構(gòu)造體系,總結(jié)構(gòu)造控礦規(guī)律,進(jìn)而探討構(gòu)造控巖控礦作用機(jī)制并建立構(gòu)造控礦模式,指出找礦方向。論文主要取得了以下成果和認(rèn)識(shí)：1、北衙金礦區(qū)構(gòu)造發(fā)育,并且具有多期構(gòu)造活動(dòng)特征,以近SN向北衙向斜為主的褶皺和近SN向、近EW向?yàn)橹鞯臄嗔褳榈V區(qū)內(nèi)高級(jí)別構(gòu)造,控制了斑巖和礦床(體)的分布,而節(jié)理作為低級(jí)別構(gòu)造控制了礦脈的展布,反映了構(gòu)造的挨次控制關(guān)系,構(gòu)成了一套褶皺-斷裂-節(jié)理成巖成礦構(gòu)造系統(tǒng)；2、構(gòu)造對(duì)富堿斑巖的侵位和成礦的發(fā)生起到主導(dǎo)性控制作用,根據(jù)控制不同礦床(體)的構(gòu)造及其成礦作用特征,將礦床體劃分為五類：1)受控于斑巖體內(nèi)斷裂、節(jié)理裂隙的斑巖型Au、Cu礦體；2)受控于斑巖與圍巖接觸帶構(gòu)造的矽卡巖型Au、Fe、Cu礦體；3)受控于圍巖層間斷裂破碎帶、斷裂、節(jié)理裂隙的熱液脈型Au、Fe礦體；4)受巖溶洞穴及不整合接觸界面控制的氧化淋濾富集型Au礦體；5)受控于爆破角礫巖筒構(gòu)造的隱爆角礫巖型Au、Fe礦體；3、通過構(gòu)造形跡力學(xué)性質(zhì)鑒定,認(rèn)為礦區(qū)自燕山晚期-喜馬拉雅早期以來主壓應(yīng)力主要經(jīng)歷了近EW向→近SN向→NW向→近EW向的轉(zhuǎn)變過程,形成了南北構(gòu)造帶、東西構(gòu)造帶和北東構(gòu)造帶,并分別歸屬于三江-滇中經(jīng)向構(gòu)造體系金沙江-程海南北構(gòu)造帶、云南緯向構(gòu)造體系湯丹-鶴慶-蘭坪東西構(gòu)造帶和麗江北東構(gòu)造帶；4、北衙金礦區(qū)控礦構(gòu)造型式主要為“接觸帶”控礦構(gòu)造型式和“多字型”構(gòu)造型式,是在喜馬拉雅中期東西構(gòu)造帶形成時(shí)期形成和發(fā)展起來的。東西構(gòu)造帶是控制喜馬拉雅中期大規(guī)模斑巖型-矽卡巖型-熱液脈型-隱爆角礫巖型礦床(化)的主導(dǎo)性構(gòu)造體系,早南北構(gòu)造帶構(gòu)成北衙金礦區(qū)成巖成礦構(gòu)造格架,晚南北構(gòu)造帶則是控制喜馬拉雅晚期氧化淋濾富集型礦床(化)的主導(dǎo)性構(gòu)造體系；5、通過構(gòu)造控礦規(guī)律分析及構(gòu)造控礦模式的建立,認(rèn)為圍巖與巖體接觸帶構(gòu)造、層間斷裂破碎帶、近南北向張性斷裂及節(jié)理構(gòu)造是北衙金礦區(qū)未來有利找礦部位,指出北衙金多金屬礦床北段炭窯地區(qū)具有重大找礦潛力。
[Abstract]:The Beiya gold polymetallic deposit in northwestern Yunnan is a typical deposit of Cenozoic porphyry metallogenic system in the Sanjiang polymetallic metallogenic belt in southwest China. It is a super large gold polymetallic deposit formed by major ore prospecting breakthroughs in recent years. By using the theory and method of ore field geomechanics, the typical ore-forming structure geometry, kinematics and tectonite characteristics are analyzed by fine surveying of large scale structural profile. Emphasis is placed on the identification of the mechanical properties of structural traces and the division of structural systems in the ore field. On this basis, the ore-controlling structure pattern is analyzed, the ore-forming structure system is established, and the rules of structural ore-controlling are summarized. The ore-controlling mechanism of tectonic rock is discussed and the tectonic ore-controlling model is established, and the prospecting direction is pointed out. The paper has obtained the following achievements and the understanding that the Wei-1, Beiya gold ore area has developed structure, and has the characteristics of multi-stage tectonic activity. The fold and near SN direction of near SN direction Beiya syncline and the near EW trending fault are high grade structures in the mining area. The distribution of porphyry and deposit (body) is controlled, while the distribution of ore vein is controlled by joint as a low grade structure, which reflects the order control relation of structure, and constitutes a set of fold, fault-joint diagenetic and metallogenic structure system. 2. Structure plays a leading role in controlling emplacement and metallogenesis of alkali-rich porphyry. According to controlling the structure and metallogenic characteristics of different deposits (bodies), the deposit body is divided into five types: 1) controlled by porphyry faults. The porphyry type Au-Cu orebody of joint fissure is controlled by skarn type Au-Fe Cu orebody which is controlled by porphyry and surrounding rock contact zone structure, and is controlled by interlayer fracture zone of surrounding rock, fracture and joint fracture of hydrothermal vein type Au-Fe orebody. 4) the oxidized leaching enriched au orebody controlled by karst cave and unconformity contact interface is controlled by the crypto-explosive breccia type Au-Fe orebody of blasting breccia tube structure, and the mechanical properties of structural trace are identified. It is considered that since the late Yanshanian and early Himalayan periods, the main compressive stress has mainly undergone the process of transition from near EW to NW and NW to EW, resulting in the formation of the north and south tectonic belts, the east-west tectonic belts and the northern and eastern tectonic belts. They belong to the Jinshajiang-Chenghai tectonic belt of Sanjiang-Central Yunnan meridional system, the Tangdan-Heqing-Lanping East-West tectonic belt of the zonal structural system of Yunnan Province and the northern and eastern structural belt of Lijiang. 4. The ore-controlling structural pattern of Beiya gold deposit is mainly "contact zone" and "multi-zigzag", which was formed and developed in the East-West tectonic belt in the middle Himalayas. The east-west tectonic belt is the dominant structural system controlling the large scale porphyry type skarn type hydrothermal vein type crypto-explosive breccia type deposit in the middle Himalayan period. The early north-south structural belt forms the framework of diagenetic and metallogenic structure in Beiya gold deposit area. The late north-south structural belt is the dominant structural system controlling the late Himalayan oxidized leaching and enrichment type deposits. Through the analysis of the tectonic ore-controlling law and the establishment of the tectonic ore-controlling model, it is considered that the structure of the contact zone between surrounding rock and rock mass. The interlayer fracture zone, the nearly north-south extensional fault and the joint structure are the favorable ore-prospecting sites in the Beiya gold deposit in the future. It is pointed out that the northern section of the Beiya gold polymetallic deposit has great prospecting potential.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.2

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