新疆黃山東銅鎳硫化物礦床地質(zhì)、地球化學(xué)特征與成礦規(guī)律
發(fā)布時(shí)間：2018-07-18 20:47
【摘要】：黃山東礦床位于新疆維吾爾自治區(qū)哈密市境內(nèi)，為典型銅鎳硫化物礦床，大地構(gòu)造位置處于康古爾縫合帶東部以及康古爾大斷裂北側(cè)的哈爾里克-大南湖島弧帶內(nèi)。本論文在研究區(qū)的區(qū)域地質(zhì)特征、礦床地質(zhì)特征、含礦巖體特征、地球化學(xué)特征及成巖成礦時(shí)代研究的基礎(chǔ)上，對(duì)黃山東銅鎳硫化物礦床取得如下認(rèn)識(shí)： 黃山東銅鎳硫化物礦床與黃山東含礦巖體關(guān)系緊密，其成礦地質(zhì)體即為黃山東巖體。該巖體巖相分帶明顯，主要巖相包括閃長(zhǎng)巖、橄欖巖、輝長(zhǎng)巖等，其巖相分異較好。 黃山東賦礦巖體產(chǎn)于中石炭統(tǒng)干墩組（C1g）中，礦床發(fā)育在含礦巖體的中下部二輝橄欖巖相和蘇長(zhǎng)輝長(zhǎng)巖相中，礦體呈似層狀、透鏡狀產(chǎn)出。礦石類型主要是浸染狀和網(wǎng)脈狀兩類；礦石礦物主要包括鎳黃鐵礦、磁黃鐵礦、黃銅礦等；脈石礦物主要包括橄欖石、輝石、斜長(zhǎng)石、角閃石等。礦石結(jié)構(gòu)主要為交代殘余結(jié)構(gòu)、它形粒狀結(jié)構(gòu)等，礦石構(gòu)造主要包括浸染狀構(gòu)造、脈狀構(gòu)造等。圍巖蝕變有滑石化、綠泥石化、蛇紋石化、透閃石化等。根據(jù)礦體特征、礦石礦物組合、礦石組構(gòu)等特征，成礦過(guò)程可劃分巖漿期、熱液期兩個(gè)期。 黃山東含礦巖體其主要氧化物含量為：38.30％～53.02%（SiO2）、0.205％～3.88％（TiO2）、4.43%～24.9%（Al2O3）、0.21%～13.7%（CaO）、1.66%～31.25%（MgO）、全堿（K2O＋Na2O）為0.12%～7.12%，，K2O/Na2O絕大多數(shù)小于1（0.024～0.541）；黃山東基性-超基性巖體普遍具有相對(duì)較高的Rb、Sr、Ba等大離子親石元素和較低的Nb、Ta等高場(chǎng)強(qiáng)元素；稀土元素配分圖解呈右傾型，ΣREE=11.22×10－6～67.64×10－6、LREE/HREE比值為1.99～4.43、δEu介于0.72～2.57之間。這些地球化學(xué)研究表明，黃山東巖體主要成分具有次堿性基性-超基性巖特征；基性-超基性巖普遍具有相對(duì)較高的低場(chǎng)強(qiáng)元素或大離子親石元素；輕重稀土元素之間的分餾程度稍強(qiáng)。 本次工作獲得黃山東含礦巖體角閃輝長(zhǎng)巖（HSD-15）、輝長(zhǎng)閃長(zhǎng)巖（HSD-16）、橄欖輝長(zhǎng)巖（HSD-37）的LA-ICP-MS鋯石U-Pb年齡分別為278.1±1.9Ma、279.6±1.9Ma、278.5±2.1Ma，結(jié)合前人研究結(jié)果，認(rèn)為黃山東巖體的形成時(shí)代是二疊紀(jì)。結(jié)合大地構(gòu)造背景，黃山東巖體應(yīng)形成于碰撞后伸展階段。在該階段，隨著俯沖過(guò)程的擠壓應(yīng)力的終止以及受到俯沖板片比重增大的影響，使得俯沖板片發(fā)生斷離，隨著巖石圈地幔伸展減薄，深部發(fā)生軟流圈地幔上涌，促使在主碰撞期被消減板塊改造過(guò)的交代地幔被軟流圈物質(zhì)加熱而部分熔融，形成玄武質(zhì)巖漿，這些巖漿侵位于石炭統(tǒng)地層中從而形成黃山東巖體。
[Abstract]:Huangshan deposit is located in Hami, Xinjiang Uygur Autonomous region. It is a typical Cu-Ni sulfide deposit. The tectonic location is located in the eastern part of the Kangguer suture zone and in the Halllik-Danan Lake island arc belt on the north side of the Kanggur great fault. This paper is based on the study of regional geological characteristics, deposit geological characteristics, ore-bearing rock mass characteristics, geochemical characteristics and diagenetic and metallogenic age in the study area. It is shown that the Cu-Ni sulphide deposit in Huangshan is closely related to the ore-bearing rock mass in Huangshan, and the ore-forming geological body is the Huang-Shandong rock body. The main lithofacies include diorite, peridotite, gabbro and so on. The ore-bearing body of Huangshan Province occurs in the dry Dun formation (C _ 1g) of the Middle Carboniferous. The deposit is developed in the middle and lower part of the ore-bearing rock mass in the Erlherite facies and the Suchang pyroxene facies. The orebody is layered and lenticular. Ore types are mainly disseminated and reticulated; ore minerals mainly include nickel pyrite, pyrrhotite, chalcopyrite and so on; gangue minerals mainly include olivine, pyroxene, plagioclase, hornblende, etc. The ore structure mainly consists of metasomatic remnant structure, it's granular structure and so on. The ore structure mainly includes disseminated structure, vein structure and so on. The wall rock alteration has slip petrifaction, green mud petrifaction, serpentine petrifaction, tremolization and so on. According to the characteristics of orebody, mineral assemblage and fabric of ore, the metallogenic process can be divided into two periods: magmatic period and hydrothermal period. The main oxide contents of Huangshan ore-bearing rock body are:% 38.30% 53.02% (Sio _ 2) 0.205, 3.88% (TIO _ 2) 4.43% (Al _ 2O _ 3) 0.21% (Cao) 1.660.25% (MgO), and 0.127.127.12% K _ 2O / Na _ 2O less than 1 (0.0240.541). The basic-ultrabasic rock bodies in Huangshan generally have relatively high Rbsrna-Ba and low Nb-Ta high field strength elements, and the REE distribution diagram is right-tilted, with 危 REE 11.22 脳 10-6 ~ 67.64 脳 10 ~ (-6) LREE / hree ratio of 1.99 ~ 4.43 and 未 EU = 0.72 ~ (2) ~ (2) ~ (57). These geochemical studies indicate that the main components of the Huangshan rock body are subalkaline basic-ultrabasic rocks, and the basic-ultrabasic rocks generally have relatively high low field strength elements or large ion lithophile elements. Fractionation between light and heavy rare earth elements is slightly stronger. In this work, LA-ICP-MS zircon U-Pb ages of hornblende gabbro (HSD-15), pyrodiorite (HSD-16) and olivine gabbro (HSD-37) of Huang-Shandong ore-bearing rock body are 278.1 鹵1.9Ma-279.6 鹵1.9Ma-278.5 鹵2.1 Ma. combined with the results of previous studies, it is considered that the formation age of Huang-Shandong pluton is Permian. Combined with the tectonic background, the Huang-Shandong rock body should be formed in the post-collision extension stage. At this stage, with the end of the extrusion stress during the subduction process and the influence of the specific gravity of the subduction plate, the subduction plate is broken off, and the asthenospheric mantle upwelling occurs as the lithospheric mantle is thinned. The metasomorphic mantle modified by subtractive plate during the main collision period was partially melted by asthenospheric material to form Black Tortoise magma which invaded the Carboniferous strata and formed the Huang-Shandong rock mass.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.41;P618.63
[Abstract]:Huangshan deposit is located in Hami, Xinjiang Uygur Autonomous region. It is a typical Cu-Ni sulfide deposit. The tectonic location is located in the eastern part of the Kangguer suture zone and in the Halllik-Danan Lake island arc belt on the north side of the Kanggur great fault. This paper is based on the study of regional geological characteristics, deposit geological characteristics, ore-bearing rock mass characteristics, geochemical characteristics and diagenetic and metallogenic age in the study area. It is shown that the Cu-Ni sulphide deposit in Huangshan is closely related to the ore-bearing rock mass in Huangshan, and the ore-forming geological body is the Huang-Shandong rock body. The main lithofacies include diorite, peridotite, gabbro and so on. The ore-bearing body of Huangshan Province occurs in the dry Dun formation (C _ 1g) of the Middle Carboniferous. The deposit is developed in the middle and lower part of the ore-bearing rock mass in the Erlherite facies and the Suchang pyroxene facies. The orebody is layered and lenticular. Ore types are mainly disseminated and reticulated; ore minerals mainly include nickel pyrite, pyrrhotite, chalcopyrite and so on; gangue minerals mainly include olivine, pyroxene, plagioclase, hornblende, etc. The ore structure mainly consists of metasomatic remnant structure, it's granular structure and so on. The ore structure mainly includes disseminated structure, vein structure and so on. The wall rock alteration has slip petrifaction, green mud petrifaction, serpentine petrifaction, tremolization and so on. According to the characteristics of orebody, mineral assemblage and fabric of ore, the metallogenic process can be divided into two periods: magmatic period and hydrothermal period. The main oxide contents of Huangshan ore-bearing rock body are:% 38.30% 53.02% (Sio _ 2) 0.205, 3.88% (TIO _ 2) 4.43% (Al _ 2O _ 3) 0.21% (Cao) 1.660.25% (MgO), and 0.127.127.12% K _ 2O / Na _ 2O less than 1 (0.0240.541). The basic-ultrabasic rock bodies in Huangshan generally have relatively high Rbsrna-Ba and low Nb-Ta high field strength elements, and the REE distribution diagram is right-tilted, with 危 REE 11.22 脳 10-6 ~ 67.64 脳 10 ~ (-6) LREE / hree ratio of 1.99 ~ 4.43 and 未 EU = 0.72 ~ (2) ~ (2) ~ (57). These geochemical studies indicate that the main components of the Huangshan rock body are subalkaline basic-ultrabasic rocks, and the basic-ultrabasic rocks generally have relatively high low field strength elements or large ion lithophile elements. Fractionation between light and heavy rare earth elements is slightly stronger. In this work, LA-ICP-MS zircon U-Pb ages of hornblende gabbro (HSD-15), pyrodiorite (HSD-16) and olivine gabbro (HSD-37) of Huang-Shandong ore-bearing rock body are 278.1 鹵1.9Ma-279.6 鹵1.9Ma-278.5 鹵2.1 Ma. combined with the results of previous studies, it is considered that the formation age of Huang-Shandong pluton is Permian. Combined with the tectonic background, the Huang-Shandong rock body should be formed in the post-collision extension stage. At this stage, with the end of the extrusion stress during the subduction process and the influence of the specific gravity of the subduction plate, the subduction plate is broken off, and the asthenospheric mantle upwelling occurs as the lithospheric mantle is thinned. The metasomorphic mantle modified by subtractive plate during the main collision period was partially melted by asthenospheric material to form Black Tortoise magma which invaded the Carboniferous strata and formed the Huang-Shandong rock mass.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.41;P618.63
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 王潤(rùn)民;李楚思;;新疆哈密黃山東銅鎳硫化物礦床成巖成礦的物理化學(xué)條件[J];成都地質(zhì)學(xué)院學(xué)報(bào);1987年03期
2 洪大衛(wèi),王式
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