本文關(guān)鍵詞： 哈達門溝 構(gòu)造變形 控礦構(gòu)造特征 疊瓦狀逆沖推覆構(gòu)造　出處：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：哈達門溝金礦區(qū)經(jīng)歷了漫長而復(fù)雜的地質(zhì)演化,形成了多期次、多階段的構(gòu)造,這些構(gòu)造嚴格控制著金礦脈的形成和演化。然而,長期以來對礦區(qū)構(gòu)造的研究一直是相對薄弱的環(huán)節(jié),對控礦構(gòu)造的研究也有待深入推進。因此,研究哈達門溝金礦區(qū)的控礦構(gòu)造特征,可以加強對該區(qū)構(gòu)造變形特征的正確認識,有助于更清晰地認識該區(qū)內(nèi)控礦構(gòu)造對金成礦的影響,進而更好地服務(wù)于國家在該礦區(qū)的整裝勘查工作。本論文以構(gòu)造地質(zhì)學(xué)相關(guān)基本論為指導(dǎo),通過野外實測剖面、鉆孔巖芯編錄、樣品系統(tǒng)采集并結(jié)合室內(nèi)綜合測試方法,主要取得以下認識:本區(qū)構(gòu)造變形可識別出五期:第一期為韌性剪切變形,形成了韌性剪切帶、柔流褶皺及礦物拉伸線理等;第二期為側(cè)向擠壓變形,形成了以烏拉山復(fù)背斜為代表的第二期褶皺、山前大斷裂、山前鉀化帶所在斷層及部分節(jié)理等;第三期為擠壓變形,形成了第三期褶皺、逆沖推覆斷層(很可能是疊瓦狀逆沖推覆斷層)、部分節(jié)理等;第四期為拉張變形,先期逆沖推覆斷層遭受拉伸而張開,接受含金熱液充填;第五期為伸展走滑變形,形成了破礦斷層體系和部分節(jié)理等。以EW向1km的間距大量統(tǒng)計礦區(qū)內(nèi)主要金礦脈中心線之間NS向的距離,獲得相鄰礦脈之間在NS向的距離集中在528m~564m之間,平均為543.5m,顯示出金礦脈在平面上分部具有等間距性;鉆孔勘探線剖面圖和可控源大地電磁測量(CSMAT)剖面圖顯示出在剖面上,金礦脈在淺表傾角較大,往深部逐漸變緩有交匯趨勢,因此容礦斷層很可能為繼承于先期(疊瓦狀)逆沖推覆斷層之上的正斷層。破礦斷層主要沿NW向、NE向及NNE向展布,大部分分布在大壩溝所在的F116斷層的NE側(cè),很可能受到了F116斷層的阻擋�？氐V構(gòu)造特征為:NEE向山前大斷裂為礦區(qū)內(nèi)控制性構(gòu)造,各種巖脈和金礦脈充填在次級斷層中。印支期早期,古亞洲洋向華北北緣俯沖消減,山前大斷裂北側(cè)形成了一系列近EW向的(疊瓦狀)逆沖推覆斷層,到印支-燕山期,華北北緣由同碰撞造山轉(zhuǎn)為碰撞后張性環(huán)境,研究區(qū)發(fā)生構(gòu)造反轉(zhuǎn),(疊瓦狀)逆沖推覆斷層遭受拉伸而張開,接受大規(guī)模含金鉀質(zhì)熱液充填交代而形成金礦脈。
[Abstract]:The Hadamenggou gold deposit has undergone a long and complicated geological evolution, forming multi-stage and multi-stage structures, which strictly control the formation and evolution of gold veins. The study of ore-controlling structure has been a relatively weak link for a long time, and the study of ore-controlling structure needs to be further promoted. Therefore, the characteristics of ore-controlling structure in the Hadamenggou gold deposit are studied. It can strengthen the correct understanding of the structural deformation characteristics in this area and help to understand more clearly the influence of the internal ore-controlling structure on the gold mineralization. This paper is guided by the basic theory of tectonics geology, through field measurement section, drilling core cataloguing, sample system collection and combined with indoor comprehensive test method. The main results are as follows: the tectonic deformation in this area can be identified as five stages: the first stage is ductile shear deformation, forming ductile shear zone, soft flow fold and mineral stretching line, and the second stage is lateral compression deformation. The second stage of the fold represented by the Wulashan complex anticline, the large fault in front of the mountain, the fault and some joints of the kalitization belt in front of the mountain, etc., the third stage is the compression deformation, and the third stage is the fold of the third stage. Thrust nappe faults (most likely imbricate thrust nappe faults, partial joints, etc.); stage 4th, tensile deformation, pre-thrust nappe faults, which were stretched and opened, accepted gold-bearing hydrothermal filling; stage 5th, extensional strike-slip deformation, The breaking fault system and some joints were formed. The distance between the main gold veins in the mining area was counted by the distance of 1 km in EW direction, and the distance between the adjacent veins in NS direction was found to be between 528 m and 564 m. The average value is 543.5 m, which shows that the gold vein has equal spacing in the plane, and the borehole exploration line profile and the controlled source magnetotelluric survey (CSMATT) profile show that the gold vein has a large dip angle in the shallow surface and a tendency to converge gradually to the depth. Therefore, the ore-bearing fault is probably a normal fault inherited from the pre-stage (imbricate) thrust nappe fault, which is mainly distributed along the NW-trending NE and NNE directions, most of which are distributed in the NE side of the F116 fault located in the dam trench. The ore-controlling tectonics are characterized by the ore-controlling tectonics: the large fault in front of the mountains is the controlling structure in the mining area, and all kinds of veins and gold veins are filled in the secondary faults. In the early Indosinian period, the paleo-Asian ocean subducted to the northern margin of North China and subducted and subducted into the northern margin of North China. A series of near-EW (imbricate) thrust nappe faults were formed on the north side of the large fault front of the mountains. By the Indosinian to Yanshanian period, the northern part of North China was transformed into a post-collision extensional environment along with the collision orogeny. The tectonic inversion (imbricate) thrust nappe fault in the study area was stretched and opened, and the gold vein was formed by large scale hydrothermal filling of gold bearing potassium.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.51

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