【摘要】：云南省香格里拉縣東坡鎢礦位于香格里拉縣城158°方向、直距80km處,行政隸屬虎跳峽鎮(zhèn)東坡村管轄。研究區(qū)處于揚(yáng)子陸塊的西緣、康滇陸塊的南緣,隸屬于松潘 甘孜褶皺帶南段、小金河 三江口斷裂的西側(cè)、金沙江斷裂東盤(pán)上。東坡鎢礦地處虎跳峽背斜西翼、南北向?qū)УV斷裂金沙江深大斷裂(F1)之抬升盤(pán),受哈巴 玉龍雪山造山帶前陸推覆構(gòu)造控制,逆沖斷裂構(gòu)造系控制了區(qū)內(nèi)鎢鈹、白鎢等礦床的分布。本文通過(guò)廣泛的資料收集,在分析總結(jié)前人工作成果基礎(chǔ)上,經(jīng)過(guò)詳實(shí)的野外實(shí)地調(diào)研,搜集大量的地質(zhì)信息,并結(jié)合礦區(qū)探礦工程和系統(tǒng)采樣分析,運(yùn)用巖石學(xué)、礦物學(xué)、礦床學(xué)、構(gòu)造地質(zhì)學(xué)、地球化學(xué)、成礦預(yù)測(cè)學(xué)等多種理論和方法,從研究區(qū)域成礦地質(zhì)背景入手,通過(guò)對(duì)礦層(體)特征,構(gòu)造特征,巖性巖相分布等方面進(jìn)行深入分析,全面掌握了構(gòu)造及圍巖蝕變種類與礦體的分布規(guī)律,找出了關(guān)鍵控礦因素,闡明了成礦地質(zhì)條件和成礦規(guī)律,初步總結(jié)了礦床成因及找礦標(biāo)志,并對(duì)研究區(qū)進(jìn)行了遠(yuǎn)景預(yù)測(cè)評(píng)價(jià)。本文認(rèn)為研究區(qū)以火山碎屑為主夾粘土質(zhì)、碳酸鹽巖的混雜沉積是鎢原始“礦源層”,經(jīng)區(qū)域變質(zhì)和長(zhǎng)期活動(dòng)的哈巴—玉龍雪山造山作用及構(gòu)造活動(dòng),逆沖斷裂兩側(cè)的層間剝離擴(kuò)容,為成礦熱液的運(yùn)移和聚集的良好通道和場(chǎng)所。礦區(qū)厚大的層狀白鎢礦體沿逆沖斷裂(F2)分布,礦體規(guī)模與形態(tài)受逆沖斷裂兩側(cè)層間破碎帶、劈理化帶及蝕變帶聯(lián)合控制,白鎢礦賦存于上二迭統(tǒng)基性火山巖系和中三疊統(tǒng)的碳酸鹽巖、火山碎屑巖系。成礦斷裂帶早期形成次級(jí)斷裂及順層破碎帶,之后疊加與順層斷裂斜交的剪切劈理化帶,形成了包括硅化石英脈(帶)等次生蝕變和同期的鎢礦化,即斷裂構(gòu)造提供礦化形成的有利通道和含礦熱液在有利蝕變巖性(基性火山巖和碳酸鹽巖)中熱液蝕變交代與礦化的富集,后期長(zhǎng)期的熱液蝕變對(duì)礦床進(jìn)行了疊加改造。因此本礦床屬以斷裂構(gòu)造控制為主的高中溫沉積—熱液疊加改造型鎢礦床,其成礦時(shí)代可能為喜馬拉雅早期。
[Abstract]:Dongpo tungsten mine in Shangri-La County of Yunnan Province is located in the direction of 158 擄in Shangri-La County, directly away from 80km, and the administration is under the jurisdiction of Dongpo Village of Hujiaoxia Town. The study area is located in the western margin of Yangtze block and the southern margin of Kangdian block, which belongs to the southern section of Songpanzhuangzi fold belt, the west side of little Jin He's fault of Sanjiangkou, and the east plate of Jinshajiang fault. Dongpo tungsten deposit is located in the west wing of the Hujiaoxia anticline. The uplift plate of Jinshajiang deep fault (F1) in the north-south guide mine is controlled by the Foreland nappe structure of the Hababan Yulong Xueshan orogenic belt, and the thrusting fault tectonic system controls the beryllium in the area. Distribution of scheelite deposits. Through extensive data collection, based on the analysis and summarization of previous work results, through detailed field investigation and field investigation, this paper collects a large amount of geological information, and combines with mining area prospecting engineering and systematic sampling analysis, using petrology and mineralogy. Ore deposit, tectonics, geochemistry, metallogenic prediction and other theories and methods are analyzed from the geological background of the study area, and through the analysis of ore-bed (body) characteristics, structural characteristics, lithologic lithofacies distribution and so on. This paper comprehensively grasps the distribution law of structural and wall rock alteration types and orebodies, finds out the key ore-controlling factors, clarifies the ore-forming geological conditions and metallogenic rules, and preliminarily summarizes the genesis and prospecting marks of the deposits. The prospective prediction and evaluation of the study area are also carried out. In this paper, it is considered that the study area is dominated by pyroclastic clayey, the mixed deposits of carbonate rocks are the original "source beds" of tungsten, and the orogeny and tectonic activity of the Haba-Yulong Snow Mountain, which is characterized by regional metamorphism and long-term activity. The exfoliation and expansion of the interlayer on both sides of the thrust fault is a good channel and place for the migration and accumulation of ore-forming hydrothermal solution. The thick layered scheelite bodies are distributed along thrust faults (F2). The size and shape of ore bodies are controlled by the interlaminar fracture zone, split physicochemical belt and alteration zone of both sides of the thrusting fault. Scheelite occurs in the upper Permian basic volcanic series and the middle Triassic carbonate rock and pyroclastic rock series. In the early stage of the metallogenic fault zone, secondary faults and bedding fracture zones were formed, and then the shear cleavage zones were superimposed on the diagonal faults, resulting in secondary alteration, such as silicified quartz veins (belts), and simultaneous tungsten mineralization. That is to say, the fault structure provides a favorable channel for mineralization and the hydrothermal solution of ore bearing in favorable alteration lithology (basic volcanic rock and carbonate rock) is enriched in hydrothermal alteration metasomatism and mineralization. In the late stage, the deposit was superimposed by long-term hydrothermal alteration. Therefore, the deposit belongs to the high temperature deposition-hydrothermal superimposed and reformed tungsten deposit dominated by fault structure, and its metallogenic age may be in the early Himalayan period.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.67

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本文編號(hào)：2398425