西藏多不雜銅（金）礦床礦化特征研究
發(fā)布時(shí)間：2018-10-21 13:06
【摘要】：西藏多不雜銅金礦區(qū)位于羌塘-三江復(fù)合地體板片南緣,班公湖-怒江縫合帶的北側(cè),屬班公湖-怒江銅金多金屬成礦帶內(nèi)多龍礦集區(qū)。隨著勘查工作的進(jìn)展,多不雜礦床已經(jīng)成為班公湖-怒江成礦帶上具有代表意義的超大型銅多金屬礦床。礦區(qū)出露的是一套次深海陸棚-盆地斜坡復(fù)陸碎屑巖-類復(fù)理石建造,為被動(dòng)大陸邊緣環(huán)境,為早侏羅統(tǒng)曲色組二巖段(J1q2),巖性為變長石石英砂巖;下白堊統(tǒng)鐵格隆組(K1-2t),巖性為一套鈣堿性系列紫紅色安山巖、安山玢巖;新近系康托組(E3k),巖性為以紫紅色砂礫巖為主;地層中見花崗閃長斑巖(γδπ)、閃長玢巖(δμ)、輝長巖(ν)等侵入巖和玄武質(zhì)安山巖(αβ)等噴出巖。礦區(qū)蝕變發(fā)育,識(shí)別出鉀化、硅化、絹云母化、綠簾石化、綠泥石化、角巖化等,并具有分帶現(xiàn)象;蝕變范圍、程度受巖體規(guī)模、產(chǎn)狀、形態(tài)等控制,蝕變類型、強(qiáng)弱則與巖體中心的距離具南寬北窄現(xiàn)象;礦化主要產(chǎn)于鉀硅化帶、泥化帶及角巖化帶,具體分布在花崗閃長斑巖體內(nèi)及其與地層接觸帶內(nèi);以浸染狀、細(xì)脈-網(wǎng)脈狀黃銅礦化、黃鐵礦化為主,少量磁鐵礦化、斑銅礦化、輝鉬礦化。通過對(duì)工程控制的鉆孔進(jìn)行條帶立體解析,結(jié)合相關(guān)測試數(shù)據(jù),作出成礦元素空間分布圖,得出以下認(rèn)識(shí):礦體總體近東西走向,傾向南,呈厚板狀,中部偏西較厚,向北側(cè)變薄且逐漸尖滅,南北方向看,礦體由深部到淺部由粗變細(xì)且逐漸分枝到頂部尖滅,熱液具有自南部深處向北部淺部運(yùn)移趨勢,在淺部具有指狀突進(jìn)特點(diǎn),受軸面南傾的同斜-斜歪褶皺軸面節(jié)理及層面和層間剪切節(jié)理的控制;平面形態(tài)上投影長方形狀,東西向長約2400m,南北向?qū)捈s600~900m,礦體頂?shù)装迤鸱^大。成礦元素平面分布看,東西方向上,Cu、Au平均品位變化較大,中西部高,東西兩側(cè)低,礦體厚度在中西部最厚,中部次之;南北方向上,Cu、Au平均品位變化規(guī)律較為明顯,中北部Cu、Au明顯較高。Cu、Au元素濃集中心集中在中西部23線、中部07-00-08線之間。成礦元素垂向分布看,總體呈不均勻變化趨勢,Cu、Au品位變化較大,貧富相漸,斑巖體及接觸帶附近成礦元素聚集,品位較高,變砂巖中品位相對(duì)較低;Cu、Au在4900~4950m之間平均品位最高,向深部呈現(xiàn)不均勻的變化;銅、金礦化無明顯相關(guān)關(guān)系,二者并非同期熱液形成,暗示存在多期不均勻疊加成礦特點(diǎn)。通過對(duì)礦化與侵入巖、地層等地質(zhì)要素關(guān)系分析:多不雜礦區(qū)鉆孔控制的中酸性侵入巖中發(fā)生礦化現(xiàn)象普遍,巖體并非全巖礦化,侵入巖中礦化主要發(fā)生在礦區(qū)中西部一條南西-北東走向的條帶上,與多不雜礦區(qū)侵入巖的主要分布范圍一致;且侵入巖中累計(jì)礦化總厚度占總礦化厚度的48.9%,巖體上、下均有成礦,成礦熱液和巖漿熱液運(yùn)移具有共同的通道,成礦發(fā)生于成巖同期或晚于巖體的形成時(shí)代;長石石英砂巖也存在礦化現(xiàn)象,礦化厚度占礦區(qū)總礦化厚度的53.36%,長石石英砂巖的礦化主要發(fā)生在礦區(qū)侵入巖侵位接觸帶附近,成礦熱液隨巖漿熱液灌入致砂巖礦化。
[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.
【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
【分類號(hào)】：P618.41;P618.51
本文編號(hào)：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.
【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
【分類號(hào)】：P618.41;P618.51
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 戴自希;澳大利亞“世紀(jì)”巨型礦床的發(fā)現(xiàn)及對(duì)我國找礦突破的啟示[J];中國地質(zhì);1996年11期
，本文編號(hào)：2285172
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