本文關(guān)鍵詞： 大渡河 韭菜坪 蝕變巖型 石英脈型 金礦　出處：《成都理工大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：大渡河流域金成礦帶韭菜坪金礦床位于鮮水河、龍門(mén)山與攀西裂谷三叉交會(huì)處,屬于前震旦系康定雜巖中金礦床,賦礦圍巖為斜長(zhǎng)角閃巖和花崗閃長(zhǎng)巖,是大渡河金礦帶中石英脈-蝕變巖型金礦床的代表之一。礦床規(guī)模小型,具有較大遠(yuǎn)景。在地質(zhì)工作過(guò)程中筆者發(fā)現(xiàn),韭菜坪金礦床既發(fā)育有石英脈型金礦體,也有蝕變巖型金礦體。據(jù)初步觀察兩者在空間分布上存在著以下關(guān)系:礦床具有水平分帶,即沿成礦的主構(gòu)造帶以蝕變巖型為主,遠(yuǎn)離主構(gòu)造帶以石英脈型為主;礦體具有垂直分帶,即內(nèi)有石英脈型金礦,外有蝕變巖型金礦;走向上的分帶,即礦體的一段為石英脈型金礦,另一段為蝕變巖型金礦或以復(fù)合關(guān)系產(chǎn)出。為了弄清兩種具有相似成礦環(huán)境的礦體各自的地質(zhì)特征及成礦過(guò)程,進(jìn)而探討成礦作用之間的內(nèi)在聯(lián)系,為該區(qū)域內(nèi)的找礦工作提出科學(xué)合理的建議,本文選擇了韭菜坪金礦床進(jìn)行了系統(tǒng)地礦床學(xué)研究。通過(guò)野外地質(zhì)調(diào)查,室內(nèi)鏡下研究,礦體及圍巖成礦元素測(cè)試分析,賦礦圍巖及石英、黃鐵礦等單礦物的微量元素測(cè)試分析,礦石硫化物硫同位素測(cè)試分析、石英ESR等方法對(duì)該礦床的系統(tǒng)綜合研究,對(duì)韭菜坪礦床的成礦過(guò)程有了客觀深入的理解:(1)韭菜坪金礦床礦石礦物成分均較簡(jiǎn)單,金屬礦物以黃鐵礦為主,脈石礦物以石英為主;(2)石英脈型和蝕變巖型與金成礦密切相關(guān)的黃鐵礦、石英單礦物稀土元素配分模式具有一致性,均表現(xiàn)為平緩的右傾曲線且具有Eu負(fù)異常、Ce極弱異常的特征,表明韭菜坪金礦床的成礦流體形成的物理化學(xué)可能是相對(duì)還原性的環(huán)境,暗示了礦床的成礦流體可能屬于中低溫?zé)嵋毫黧w。另一方面,韭菜坪成礦期的石英包裹體均一溫度范圍相當(dāng),均集中分布于160℃~180℃,屬于中低溫?zé)嵋毫黧w;(3)韭菜坪黃鐵礦δ34S值變化范圍較小,δ34S值在2.5附近,組成較為穩(wěn)定且均一化程度較高,與幔源硫較為接近,表明成礦流體具有地幔硫的特征;(4)通過(guò)石英活化ESR測(cè)年方法,測(cè)得韭菜坪金礦床的成礦年齡集中分布于17~13Ma,該時(shí)期對(duì)應(yīng)于青藏高原后碰撞期(25~0Ma),表明韭菜坪金礦床屬于后碰撞期剪切作用為主所形成時(shí)期的造山型金礦床;(5)兩類(lèi)礦化類(lèi)型的空間分布與斷裂性質(zhì)有著密切的關(guān)系,蝕變巖型主要受控于高級(jí)別的緩傾角斷裂帶,以壓性或壓扭性為主,往往產(chǎn)于主干斷裂中;石英脈型礦化主要受控于低級(jí)別陡傾角斷裂帶,以張性或張扭性為主,往往產(chǎn)于伴生或派生的小規(guī)模次級(jí)構(gòu)造中。不同性質(zhì)的斷裂構(gòu)造控制著不同類(lèi)型的金礦,可以通過(guò)對(duì)不同類(lèi)型金礦特征的研究,進(jìn)一步研究控礦構(gòu)造的性質(zhì),進(jìn)而可以預(yù)測(cè)隱伏控礦構(gòu)造和可能賦存的金礦床。綜上所述,韭菜坪金礦床石英脈型和蝕變巖型礦體屬于同一成因,由于構(gòu)造條件和成礦作用方式不同而產(chǎn)生不同礦體形式。其成礦時(shí)代一致均為喜山期,成礦溫度低,受韌-脆性剪切滑脫帶控制。該礦床屬于青藏高原東緣后碰撞晚期剪切作用所形成的造山型金礦,且處于造山型金礦的中部帶。
[Abstract]:The Dadu River Valley metallogenic belt of Jiucaiping gold deposit is located in the fresh water river, Longmen mountain and the Panxi rift trigeminal intersection, which belongs to the pre Sinian Kangding complex rock gold deposit, ore rock amphibolites and granodiorite, is one of the representatives of the Dadu River gold belt in the quartz vein and altered rock type of gold deposit. The deposit scale small, has a great potential. The author found in geological work in the process of development of Jiucaiping gold deposit is quartz vein type gold ore bodies, have altered rock type gold deposit. According to preliminary observation and there is the following relationship in the spatial distribution of ore deposits is: Horizontal zoning, which is the main along with the metallogenic tectonic altered rock type, belt dominated by quartz vein type from the main structure; the ore body has vertical zoning, namely in the quartz vein type gold deposit, outside the altered rock type gold deposit; strike zoning, which is a section of the ore body is quartz vein type gold deposit, another for alteration Rock type gold deposit or compoundings. In order to find out the two kinds of ore similar metallogenic environment of their geological features and metallogenic process, and to explore the relationship between mineralization and put forward reasonable suggestions for the regional prospecting work, this paper chooses the leek Dongping gold deposit of mineral bed learning system the research. Through field geological survey, indoor microscopic study, analysis of orebody and surrounding rock metallogenic elements test, ore bearing rock and quartz, trace element analysis of pyrite minerals test, sulfur isotope analysis of sulfide ore testing system, a comprehensive study of the deposit of quartz ESR, metallogenetic process of Jiucaiping deposits with objective understanding: (1) Jiucaiping ore mineral composition is simple, the metal minerals are pyrite, quartz is the main gangue mineral; (2) quartz vein and altered rock type and The gold mineralization is closely related to pyrite, quartz mineral REE patterns are consistent, showed a gentle curve right and has very weak negative Eu anomaly, Ce anomalies, indicating that the physical chemical ore-forming fluid Jiucaiping gold deposit formation may be relatively primary environment, suggests that the ore-forming fluid the deposit may belong to low temperature hydrothermal fluid. On the other hand, Jiucaiping mineralization quartz inclusions are all concentrated in the range is 160 DEG ~180 DEG, which belongs to the medium low temperature hydrothermal fluid; (3) Jiucaiping pyrite 34S values changed a little, 34S values in the vicinity of 2.5. Stable and uniform degree is high, relatively close to the mantle derived sulfur, showed the characteristics of ore-forming fluids with mantle sulfur; (4) ESR dating method through the activation of quartz, the mineralization age measured Jiucaiping gold deposit concentration distribution in the period of 17~13Ma. Corresponding to the Qinghai Tibet plateau after the collision period (25~0Ma), showed that Jiucaiping gold deposit belongs to the post collision stage mainly formed by shear orogenic gold deposit period; (5) the spatial distribution of two types of mineralization type and fracture properties are closely related, altered rock type is mainly controlled by the high level of the low angle faults with pressure or compressoshear, often occurs in the main fracture; quartz vein type mineralization is mainly controlled by the low level of steep fault belt, with a tensile, small secondary structures often produced in the associated or derived. Distinct tectonic control of different types gold can, through the study of different types of gold deposits, further study on the properties of the ore controlling structure, which can predict the deposit concealed ore controlling structure and possible occurrence. In summary, Jiucaiping gold deposit of quartz vein and altered rock type ore body belongs to The same origin, due to tectonic conditions and mineralization in different ways and have different forms. Its orebody mineralization ages were consistent with Himalayan metallogenic temperature is low, the ductile brittle shear zone control. The deposit belongs to the eastern margin of the Tibetan Plateau after the formation of the late collision shear orogenic gold, and in the middle orogenic type gold deposit belt.

【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.51

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本文編號(hào)：1523592