西藏多不杂铜（金）矿床矿化特征研究
发布时间：2018-10-21 13:06
【摘要】：西藏多不杂铜金矿区位于羌塘-三江复合地体板片南缘,班公湖-怒江缝合带的北侧,属班公湖-怒江铜金多金属成矿带内多龙矿集区。随着勘查工作的进展,多不杂矿床已经成为班公湖-怒江成矿带上具有代表意义的超大型铜多金属矿床。矿区出露的是一套次深海陆棚-盆地斜坡复陆碎屑岩-类复理石建造,为被动大陆边缘环境,为早侏罗统曲色组二岩段(J1q2),岩性为变长石石英砂岩;下白垩统铁格隆组(K1-2t),岩性为一套钙碱性系列紫红色安山岩、安山玢岩;新近系康托组(E3k),岩性为以紫红色砂砾岩为主;地层中见花岗闪长斑岩(γδπ)、闪长玢岩(δμ)、辉长岩(ν)等侵入岩和玄武质安山岩(αβ)等喷出岩。矿区蚀变发育,识别出钾化、硅化、绢云母化、绿帘石化、绿泥石化、角岩化等,并具有分带现象;蚀变范围、程度受岩体规模、产状、形态等控制,蚀变类型、强弱则与岩体中心的距离具南宽北窄现象;矿化主要产于钾硅化带、泥化带及角岩化带,具体分布在花岗闪长斑岩体内及其与地层接触带内;以浸染状、细脉-网脉状黄铜矿化、黄铁矿化为主,少量磁铁矿化、斑铜矿化、辉钼矿化。通过对工程控制的钻孔进行条带立体解析,结合相关测试数据,作出成矿元素空间分布图,得出以下认识:矿体总体近东西走向,倾向南,呈厚板状,中部偏西较厚,向北侧变薄且逐渐尖灭,南北方向看,矿体由深部到浅部由粗变细且逐渐分枝到顶部尖灭,热液具有自南部深处向北部浅部运移趋势,在浅部具有指状突进特点,受轴面南倾的同斜-斜歪褶皱轴面节理及层面和层间剪切节理的控制;平面形态上投影长方形状,东西向长约2400m,南北向宽约600~900m,矿体顶底板起伏较大。成矿元素平面分布看,东西方向上,Cu、Au平均品位变化较大,中西部高,东西两侧低,矿体厚度在中西部最厚,中部次之;南北方向上,Cu、Au平均品位变化规律较为明显,中北部Cu、Au明显较高。Cu、Au元素浓集中心集中在中西部23线、中部07-00-08线之间。成矿元素垂向分布看,总体呈不均匀变化趋势,Cu、Au品位变化较大,贫富相渐,斑岩体及接触带附近成矿元素聚集,品位较高,变砂岩中品位相对较低;Cu、Au在4900~4950m之间平均品位最高,向深部呈现不均匀的变化;铜、金矿化无明显相关关系,二者并非同期热液形成,暗示存在多期不均匀叠加成矿特点。通过对矿化与侵入岩、地层等地质要素关系分析:多不杂矿区钻孔控制的中酸性侵入岩中发生矿化现象普遍,岩体并非全岩矿化,侵入岩中矿化主要发生在矿区中西部一条南西-北东走向的条带上,与多不杂矿区侵入岩的主要分布范围一致;且侵入岩中累计矿化总厚度占总矿化厚度的48.9%,岩体上、下均有成矿,成矿热液和岩浆热液运移具有共同的通道,成矿发生于成岩同期或晚于岩体的形成时代;长石石英砂岩也存在矿化现象,矿化厚度占矿区总矿化厚度的53.36%,长石石英砂岩的矿化主要发生在矿区侵入岩侵位接触带附近,成矿热液随岩浆热液灌入致砂岩矿化。
[Abstract]:The multi-metal metallogenic belt is located on the north side of the Qiangtang-Sanjiang composite ground plate, the north of the Bangong Lake-Nujiang suture zone, and belongs to the multi-metal metallogenic belt of the Bangong Lake-Nujiang copper-gold polymetallic metallogenic belt. With the progress of exploration work, the multi-impurity deposit has become an ultra-large copper polymetallic deposit with representative meaning on the Bangong Lake-Nujiang metallogenic belt. The mining area shows a set of sub-deep-sea shelf-basin slope complex land clastic rock-class complex rock construction, which is the passive continental margin environment, which is the second rock section (J1q2) of the Early Jurassic Daqu Formation, and the lithology is altered feldspar quartz sandstone; the lower Cretaceous Tigeron Formation (K1-2t). Lithology is a set of alkaline series of calcium-alkaline series of purplish-purple andesia, Anshan marble; Neotype Kangto Formation (Fisk), lithology: purplish red conglomerate; in the formation, it can be seen from the amphibolite (Triassic), the amphibolite (100.0. mu.m), The intrusive rocks, such as gabbro (chlorite), and cryptic andesites (diorite), etc., are ejected from the rocks. The alteration and development of the mining area identified the formation of potassium, silication, sericitization, epidote, chloritization, amphibolization and the like, and has the phenomenon of subzone; the extent of alteration of alteration is controlled by the scale, attitude and morphology of rock mass, and the alteration type and strength are the narrow phenomenon of south wide north with the distance from the center of the rock mass; The mineralization is mainly found in potassium-siliconized zone, argillaceous zone and amphibolite zone, which is mainly distributed in the long porphyry body and its contact zone with the formation. According to relevant test data, a spatial distribution map of ore-forming elements is made by carrying out strip three-dimensional analysis on the drilling of engineering control, and the following understanding is obtained: the overall near-east trend of the ore body tends to be in a thick plate shape, the middle part of the middle part is thicker, the north side is thinned and gradually pointed out, and the north-south direction is seen, The ore body is composed of deep to shallow part, which is thin and branched to the top of the shallow part, and has the tendency of migration from deep to shallow part in the north. The rectangular shape is projected on the planar shape with a length of about 2400m, the north-south direction is about 600-900m, and the bottom plate of the ore body fluctuates greatly. According to the plane distribution of metallogenetic elements, the average grade of Cu and Au in the east and west direction is large, the middle and west are high, the two sides of the east and west are low, the thickness of the ore body is thicker in the middle and west, the middle is the second, and the average grade of Cu and Au in the north-south direction is obvious, and Cu and Au are obviously higher in the north-south direction. The concentrated concentration of Cu and Au elements is concentrated in 23 lines in the Midwest and between 07-00-08 lines in the middle. According to the vertical distribution of ore-forming elements, there is no uniform change tendency, Cu, Au grade change is large, the rich and poor phase gradually, the ore-forming elements near the porphyry body and the contact zone gather, the grade is high, the grade of the variable sandstone is relatively low, Cu and Au have the highest average grade between 4900 and 4950m, There is no obvious correlation between copper and gold mineralization. Through the analysis of the relationship between mineralization and intrusive rocks, strata and other geological factors, there is a general phenomenon of mineralization in the medium-acidic intrusive rocks controlled by drilling in the multi-heterogenous mining area, and the rock mass is not mineralized by all rocks, and the mineralization in intrusive rocks mainly occurs in a strip belt in the west-west direction of the west and west of the mining area. The total mineralized total thickness of intrusive rocks is 48. 9% of the total mineralization thickness, and the ore-forming, ore-forming and magmatic hydrothermal migration has a common channel, which occurs at the time of diagenesis or later in the formation of rock mass. The mineralization of feldspar quartz sandstone is 53. 36% of the total mineralization thickness of the mining area, and the mineralization of feldspar quartz sandstone occurs mainly in the vicinity of the contact zone of intrusive rocks in the mining area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P618.51
本文编号：2285172
[Abstract]:The multi-metal metallogenic belt is located on the north side of the Qiangtang-Sanjiang composite ground plate, the north of the Bangong Lake-Nujiang suture zone, and belongs to the multi-metal metallogenic belt of the Bangong Lake-Nujiang copper-gold polymetallic metallogenic belt. With the progress of exploration work, the multi-impurity deposit has become an ultra-large copper polymetallic deposit with representative meaning on the Bangong Lake-Nujiang metallogenic belt. The mining area shows a set of sub-deep-sea shelf-basin slope complex land clastic rock-class complex rock construction, which is the passive continental margin environment, which is the second rock section (J1q2) of the Early Jurassic Daqu Formation, and the lithology is altered feldspar quartz sandstone; the lower Cretaceous Tigeron Formation (K1-2t). Lithology is a set of alkaline series of calcium-alkaline series of purplish-purple andesia, Anshan marble; Neotype Kangto Formation (Fisk), lithology: purplish red conglomerate; in the formation, it can be seen from the amphibolite (Triassic), the amphibolite (100.0. mu.m), The intrusive rocks, such as gabbro (chlorite), and cryptic andesites (diorite), etc., are ejected from the rocks. The alteration and development of the mining area identified the formation of potassium, silication, sericitization, epidote, chloritization, amphibolization and the like, and has the phenomenon of subzone; the extent of alteration of alteration is controlled by the scale, attitude and morphology of rock mass, and the alteration type and strength are the narrow phenomenon of south wide north with the distance from the center of the rock mass; The mineralization is mainly found in potassium-siliconized zone, argillaceous zone and amphibolite zone, which is mainly distributed in the long porphyry body and its contact zone with the formation. According to relevant test data, a spatial distribution map of ore-forming elements is made by carrying out strip three-dimensional analysis on the drilling of engineering control, and the following understanding is obtained: the overall near-east trend of the ore body tends to be in a thick plate shape, the middle part of the middle part is thicker, the north side is thinned and gradually pointed out, and the north-south direction is seen, The ore body is composed of deep to shallow part, which is thin and branched to the top of the shallow part, and has the tendency of migration from deep to shallow part in the north. The rectangular shape is projected on the planar shape with a length of about 2400m, the north-south direction is about 600-900m, and the bottom plate of the ore body fluctuates greatly. According to the plane distribution of metallogenetic elements, the average grade of Cu and Au in the east and west direction is large, the middle and west are high, the two sides of the east and west are low, the thickness of the ore body is thicker in the middle and west, the middle is the second, and the average grade of Cu and Au in the north-south direction is obvious, and Cu and Au are obviously higher in the north-south direction. The concentrated concentration of Cu and Au elements is concentrated in 23 lines in the Midwest and between 07-00-08 lines in the middle. According to the vertical distribution of ore-forming elements, there is no uniform change tendency, Cu, Au grade change is large, the rich and poor phase gradually, the ore-forming elements near the porphyry body and the contact zone gather, the grade is high, the grade of the variable sandstone is relatively low, Cu and Au have the highest average grade between 4900 and 4950m, There is no obvious correlation between copper and gold mineralization. Through the analysis of the relationship between mineralization and intrusive rocks, strata and other geological factors, there is a general phenomenon of mineralization in the medium-acidic intrusive rocks controlled by drilling in the multi-heterogenous mining area, and the rock mass is not mineralized by all rocks, and the mineralization in intrusive rocks mainly occurs in a strip belt in the west-west direction of the west and west of the mining area. The total mineralized total thickness of intrusive rocks is 48. 9% of the total mineralization thickness, and the ore-forming, ore-forming and magmatic hydrothermal migration has a common channel, which occurs at the time of diagenesis or later in the formation of rock mass. The mineralization of feldspar quartz sandstone is 53. 36% of the total mineralization thickness of the mining area, and the mineralization of feldspar quartz sandstone occurs mainly in the vicinity of the contact zone of intrusive rocks in the mining area.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P618.51
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相关期刊论文 前1条
1 戴自希;澳大利亚“世纪”巨型矿床的发现及对我国找矿突破的启示[J];中国地质;1996年11期
，本文编号：2285172
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