【摘要】：雙牛棚金礦床地處大渡河金成礦帶,大地構(gòu)造位置位于揚(yáng)子準(zhǔn)地臺和松潘-甘孜地槽褶皺系兩個(gè)Ⅰ級大地構(gòu)造單元的接合部。處于道孚-康定三叉裂谷系的中心,也是南北向安寧河深斷裂、北西向鮮水河深斷裂、北東向茂汶深斷裂和北川—映秀深斷裂四大斷裂帶的交匯處。其屬于前震旦系康定雜巖體基底與蓋層界面中的金礦床,屬于大渡河金礦帶中硫化物石英脈型金礦床。本文主要通過總結(jié)前人研究成果和收集地質(zhì)資料,并結(jié)合到研究區(qū)開展野外地質(zhì)調(diào)查,利用槽探鉆探等山地工程等技術(shù)手段,采用顯微鏡薄片觀察、電子探針等實(shí)驗(yàn)分析測試手段。主要對康定市雙牛棚金礦床成礦地質(zhì)背景及礦床地質(zhì)特征、礦體地質(zhì)特征、礦物組構(gòu)和成分及控礦因素等進(jìn)行了研究,得出以下認(rèn)識:康定雙牛棚金礦床中金礦體主要賦存于晉寧—澄江期石英閃長巖體中,巖性主要為淺灰-灰色角閃黑云母石英閃長巖,暗色礦物為角閃石和黑云母,多已發(fā)生綠泥石化和綠簾石化。沿大渡河一帶出露大面積晚元古代的晉寧—澄江期“康定雜巖”。結(jié)合區(qū)域資料分析得出研究區(qū)東西向斷裂(F16斷層)為其主要的控礦構(gòu)造,分布于研究區(qū)的中部,向東延伸出研究區(qū);以及北東向斷裂(F1斷層)為區(qū)域推覆斷層,是北東向、北西向的次級控礦、容礦斷層。通過槽探鉆探工程控制,研究區(qū)內(nèi)礦體共有7條,礦體編號為1、2、3、4、5、6、7號,礦體多呈平行脈狀分布,局部呈透鏡狀,嚴(yán)格受斷裂控制。通過野外觀察礦化分布情況及圍巖蝕變特征,礦體與圍巖界線模糊,兩者呈漸變式接觸關(guān)系,多見硅化、黃鐵礦化、絹云母化等蝕變。收集前人地質(zhì)資料,并經(jīng)過實(shí)地野外地質(zhì)調(diào)查和室內(nèi)綜合研究,對雙牛棚礦床地質(zhì)特征對其控礦因素進(jìn)行分析得出:(1)其大地構(gòu)造背景是金礦成礦的有利地段,控制著區(qū)域金礦的形成。該區(qū)域巖漿熱液等運(yùn)動(dòng)強(qiáng)烈、地質(zhì)構(gòu)造運(yùn)動(dòng)頻繁,超大斷裂及褶皺等集聚,不僅是深部各種物質(zhì)、元素和熱能動(dòng)能聚集釋放的良好位置,而且是金礦等成礦物質(zhì)特別富集的重要區(qū)域。(2)礦體嚴(yán)格受斷裂構(gòu)造控制,其中F16斷層作為主要的控礦構(gòu)造,是礦液運(yùn)移的主要通道,為成礦提供在它的構(gòu)造破碎帶里面,巖石的破碎程度不僅決定著礦體的空間展布及產(chǎn)出時(shí)的產(chǎn)狀,而且關(guān)乎到礦化時(shí)的富集情況等。與此同時(shí)金礦(化)體在構(gòu)造破碎帶里面產(chǎn)出形態(tài)為脈狀、透鏡狀及不規(guī)則狀等,并且經(jīng)常呈膨縮、復(fù)合分支等狀態(tài)產(chǎn)出;(3)巖漿活動(dòng)為金礦成礦提供熱源,形成含礦熱液沿通道運(yùn)移富集成礦,巖漿侵位演化、交代重熔、動(dòng)力分異是控制金礦形成的重要因素;(4)基底地層主要由混合巖化斜長角閃巖、角閃斜長角礫(條帶)狀混合巖、角閃斜長混合片麻巖、黑云變粒巖、二長淺粒巖等組成,其中基性混合巖類的金豐度也大大高于地殼平均豐度值,也是金礦成礦物質(zhì)來源之一。(5)綜合分析認(rèn)為在研究區(qū)外圍,在區(qū)域性推覆逆斷層(F1)上、下盤次級斷裂破碎帶中,已發(fā)現(xiàn)十多處中、小型礦床、礦點(diǎn),其控礦構(gòu)造以北東向斷裂為主,次為北西向;其中近礦圍巖蝕變主要有黃鐵礦化、硅化、碳酸鹽化、絹云母化、云英巖化、方鉛礦化、黃銅礦化等,并且金元素地球化學(xué)異常強(qiáng)度大,具有三帶和濃集中心的金異常,是尋找金礦的遠(yuǎn)景區(qū),特別是與康定雜巖有成因聯(lián)系的康定大渡河金礦,是我國重要的金礦類型之一。區(qū)域上位于大渡河金成礦帶,是我國重要的金礦類型之一,是尋找與韌性剪切帶有關(guān)的構(gòu)造蝕變巖型和石英脈型金礦的有利地區(qū)。
[Abstract]:The double-cow-shed gold deposit is located in the gold-forming belt of the Dadu River, and the geotectonic position is located at the joint of the two Class I geotectonic units of the Yangzi and the Songpan-Ganzi geosyncline. It is at the center of the Rift-Kangding three-fork rift system. It is also the junction of the four fault zones in the north-south to the Anning River, the deep-fracture of the north-west to the Xianshuihe River, the deep-fracture of the north-east and the deep-fracture of the Yingxiu-show of the north-east. The gold deposit belongs to the gold deposit in the interface of the base of the pre-Sinian Kangding complex rock mass and the cap layer, and belongs to the sulfide quartz vein type gold deposit in the Dadu River gold deposit. In this paper, by summing up the previous research achievements and collecting the geological data, and combining with the research area to carry out the field geological survey, using the technical means such as the exploration drilling and so on, the experimental and test methods such as the microscope slice observation, the electron probe and the like are used. The ore-forming geological background and the geological characteristics of the deposit, the geological characteristics of the ore body, the mineral structure and the composition and the ore-controlling factors are mainly studied, and the following knowledge is drawn: the gold ore body in the Kangding double-cattle-shed gold deposit is mainly in the quartz diorite body in the Jinning-Chenjiang period, The lithology is mainly light gray-gray hornblende biotite quartz diorite, and the dark minerals are amphibole and biotite. The "Kangding complex rock" of Jinning's Chenjiang period, which is exposed to the large area of the Late Proterozoic in the large area along the Dadu River. Based on the analysis of the regional data, the east-west fault (F16 fault) of the study area is the main ore-controlling structure, which is distributed in the middle of the study area, extending from the east to the study area, and the NE fault (F1 fault) is the regional thrust fault, which is the secondary ore-controlling in the north and the north of the north, Ore-bearing fault. Through the control of the exploration and drilling project, there are 7 ore bodies in the study area. The number of the ore bodies is 1,2,3,4,5,6 and 7. The ore body is in a parallel pulse shape, and the body is in a lenticular shape and is strictly controlled by the fracture. Through the field observation of the distribution of the mineralization and the characteristics of the alteration of the surrounding rock, the boundary between the ore body and the surrounding rock is fuzzy, and the two are in gradual contact relation. The ore-controlling factors of the double-cow-shed deposit are analyzed by the field-field geological survey and the indoor comprehensive study. (1) The tectonic setting is the favorable section of the gold mineralization, and the formation of the regional gold deposit is controlled. The regional magmatic hydrothermal fluid has strong motion, frequent geological tectonic movement, super-large fracture and folding and the like, not only is a good location for the accumulation and release of various substances, elements and thermal energy in the deep part, but also is an important area of special enrichment of the minerals such as the gold mine and the like. (2) The ore body is strictly controlled by the fracture structure, in which the F16 fault is the main ore-controlling structure, which is the main channel of the ore and liquid migration, and provides the ore-forming in its tectonic fracture zone. The degree of fracture of the rock not only determines the spatial distribution of the ore body and the occurrence of the output, But also relates to the enrichment of the time of the mineralization, and the like. At the same time, the formation of the gold (chemical) body in the structure of the fracture zone is a vein, a lens, an irregular shape, and the like, and the state output such as the expansion and the compound branch is often presented; (3) the magmatism provides a heat source for the ore-forming of the gold deposit, and forms the ore-bearing hydrothermal fluid along the channel for enrichment and mineralization, The evolution of magmatism, metasomatic remelting and dynamic differentiation are the important factors for controlling the formation of gold deposits; and (4) the basement formation is mainly composed of mixed-rock, oblique-amphibolite, amphibolite (strip)-shaped mixed rock, amphibolite-long mixed gneiss, black-cloud granulite, and two-length light-grained rock. The gold abundance of the basic mixed rock is also much higher than that of the crust, and it is also one of the mineral sources of the gold deposit. (5) The comprehensive analysis is that in the periphery of the research area, in the fault zone of the secondary fracture of the lower disc, in the secondary fracture zone of the lower disc, there are more than ten middle, small-sized ore deposits and ore points, and the east to the north of the ore-controlling structure is the main, and the secondary fault is the north-west direction; in which the alteration of the surrounding rock is mainly pyrite, siliconizing, carbonating, sericite, migmatization, galena, chalcopyrite and the like, and the geochemical anomaly intensity of the gold element is large, and the gold anomaly with the three-band and concentrated concentration centers is a far-reaching scenic spot for the gold deposit, The Kangding Dadu River gold deposit, in particular with Kangding complex, is one of the important types of gold deposits in China. The area is located in the gold-forming zone of the Dadu River. It is one of the important types of gold deposits in our country. It is a favorable area for finding the tectonic alteration rock type and the quartz vein type gold deposit related to the ductile shear zone.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.51

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