康定市双牛棚金矿床地质特征及控矿因素分析
发布时间：2019-05-20 09:11
【摘要】：双牛棚金矿床地处大渡河金成矿带,大地构造位置位于扬子准地台和松潘-甘孜地槽褶皱系两个Ⅰ级大地构造单元的接合部。处于道孚-康定三叉裂谷系的中心,也是南北向安宁河深断裂、北西向鲜水河深断裂、北东向茂汶深断裂和北川—映秀深断裂四大断裂带的交汇处。其属于前震旦系康定杂岩体基底与盖层界面中的金矿床,属于大渡河金矿带中硫化物石英脉型金矿床。本文主要通过总结前人研究成果和收集地质资料,并结合到研究区开展野外地质调查,利用槽探钻探等山地工程等技术手段,采用显微镜薄片观察、电子探针等实验分析测试手段。主要对康定市双牛棚金矿床成矿地质背景及矿床地质特征、矿体地质特征、矿物组构和成分及控矿因素等进行了研究,得出以下认识:康定双牛棚金矿床中金矿体主要赋存于晋宁—澄江期石英闪长岩体中,岩性主要为浅灰-灰色角闪黑云母石英闪长岩,暗色矿物为角闪石和黑云母,多已发生绿泥石化和绿帘石化。沿大渡河一带出露大面积晚元古代的晋宁—澄江期“康定杂岩”。结合区域资料分析得出研究区东西向断裂(F16断层)为其主要的控矿构造,分布于研究区的中部,向东延伸出研究区;以及北东向断裂(F1断层)为区域推覆断层,是北东向、北西向的次级控矿、容矿断层。通过槽探钻探工程控制,研究区内矿体共有7条,矿体编号为1、2、3、4、5、6、7号,矿体多呈平行脉状分布,局部呈透镜状,严格受断裂控制。通过野外观察矿化分布情况及围岩蚀变特征,矿体与围岩界线模糊,两者呈渐变式接触关系,多见硅化、黄铁矿化、绢云母化等蚀变。收集前人地质资料,并经过实地野外地质调查和室内综合研究,对双牛棚矿床地质特征对其控矿因素进行分析得出:(1)其大地构造背景是金矿成矿的有利地段,控制着区域金矿的形成。该区域岩浆热液等运动强烈、地质构造运动频繁,超大断裂及褶皱等集聚,不仅是深部各种物质、元素和热能动能聚集释放的良好位置,而且是金矿等成矿物质特别富集的重要区域。(2)矿体严格受断裂构造控制,其中F16断层作为主要的控矿构造,是矿液运移的主要通道,为成矿提供在它的构造破碎带里面,岩石的破碎程度不仅决定着矿体的空间展布及产出时的产状,而且关乎到矿化时的富集情况等。与此同时金矿(化)体在构造破碎带里面产出形态为脉状、透镜状及不规则状等,并且经常呈膨缩、复合分支等状态产出;(3)岩浆活动为金矿成矿提供热源,形成含矿热液沿通道运移富集成矿,岩浆侵位演化、交代重熔、动力分异是控制金矿形成的重要因素;(4)基底地层主要由混合岩化斜长角闪岩、角闪斜长角砾(条带)状混合岩、角闪斜长混合片麻岩、黑云变粒岩、二长浅粒岩等组成,其中基性混合岩类的金丰度也大大高于地壳平均丰度值,也是金矿成矿物质来源之一。(5)综合分析认为在研究区外围,在区域性推覆逆断层(F1)上、下盘次级断裂破碎带中,已发现十多处中、小型矿床、矿点,其控矿构造以北东向断裂为主,次为北西向;其中近矿围岩蚀变主要有黄铁矿化、硅化、碳酸盐化、绢云母化、云英岩化、方铅矿化、黄铜矿化等,并且金元素地球化学异常强度大,具有三带和浓集中心的金异常,是寻找金矿的远景区,特别是与康定杂岩有成因联系的康定大渡河金矿,是我国重要的金矿类型之一。区域上位于大渡河金成矿带,是我国重要的金矿类型之一,是寻找与韧性剪切带有关的构造蚀变岩型和石英脉型金矿的有利地区。
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51
本文编号：2481531
[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.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51
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