新疆黄山东铜镍硫化物矿床地质、地球化学特征与成矿规律
发布时间：2018-07-18 20:47
【摘要】：黄山东矿床位于新疆维吾尔自治区哈密市境内，为典型铜镍硫化物矿床，大地构造位置处于康古尔缝合带东部以及康古尔大断裂北侧的哈尔里克-大南湖岛弧带内。本论文在研究区的区域地质特征、矿床地质特征、含矿岩体特征、地球化学特征及成岩成矿时代研究的基础上，对黄山东铜镍硫化物矿床取得如下认识： 黄山东铜镍硫化物矿床与黄山东含矿岩体关系紧密，其成矿地质体即为黄山东岩体。该岩体岩相分带明显，主要岩相包括闪长岩、橄榄岩、辉长岩等，其岩相分异较好。 黄山东赋矿岩体产于中石炭统干墩组（C1g）中，矿床发育在含矿岩体的中下部二辉橄榄岩相和苏长辉长岩相中，矿体呈似层状、透镜状产出。矿石类型主要是浸染状和网脉状两类；矿石矿物主要包括镍黄铁矿、磁黄铁矿、黄铜矿等；脉石矿物主要包括橄榄石、辉石、斜长石、角闪石等。矿石结构主要为交代残余结构、它形粒状结构等，矿石构造主要包括浸染状构造、脉状构造等。围岩蚀变有滑石化、绿泥石化、蛇纹石化、透闪石化等。根据矿体特征、矿石矿物组合、矿石组构等特征，成矿过程可划分岩浆期、热液期两个期。 黄山东含矿岩体其主要氧化物含量为：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）、全碱（K2O＋Na2O）为0.12%～7.12%，，K2O/Na2O绝大多数小于1（0.024～0.541）；黄山东基性-超基性岩体普遍具有相对较高的Rb、Sr、Ba等大离子亲石元素和较低的Nb、Ta等高场强元素；稀土元素配分图解呈右倾型，ΣREE=11.22×10－6～67.64×10－6、LREE/HREE比值为1.99～4.43、δEu介于0.72～2.57之间。这些地球化学研究表明，黄山东岩体主要成分具有次碱性基性-超基性岩特征；基性-超基性岩普遍具有相对较高的低场强元素或大离子亲石元素；轻重稀土元素之间的分馏程度稍强。 本次工作获得黄山东含矿岩体角闪辉长岩（HSD-15）、辉长闪长岩（HSD-16）、橄榄辉长岩（HSD-37）的LA-ICP-MS锆石U-Pb年龄分别为278.1±1.9Ma、279.6±1.9Ma、278.5±2.1Ma，结合前人研究结果，认为黄山东岩体的形成时代是二叠纪。结合大地构造背景，黄山东岩体应形成于碰撞后伸展阶段。在该阶段，随着俯冲过程的挤压应力的终止以及受到俯冲板片比重增大的影响，使得俯冲板片发生断离，随着岩石圈地幔伸展减薄，深部发生软流圈地幔上涌，促使在主碰撞期被消减板块改造过的交代地幔被软流圈物质加热而部分熔融，形成玄武质岩浆，这些岩浆侵位于石炭统地层中从而形成黄山东岩体。
[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 卤1.9Ma-279.6 卤1.9Ma-278.5 卤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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：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 卤1.9Ma-279.6 卤1.9Ma-278.5 卤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.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P618.63
【参考文献】
相关期刊论文 前10条
1 王润民;李楚思;;新疆哈密黄山东铜镍硫化物矿床成岩成矿的物理化学条件[J];成都地质学院学报;1987年03期
2 洪大卫,王式
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