新疆巴尔鲁克地区加曼铁列克得、石屋矿化斑岩体的特征及成矿意义
发布时间：2019-01-20 19:15
【摘要】：巴尔鲁克地区位于新疆西准噶尔西缘,西邻哈萨克斯坦巴尔喀什成矿带,东接包古图成矿区。本文在前人工作的基础上,通过野外地质考察、岩相学、地球化学、同位素示踪和锆石U-Pb年代学等研究,确定加曼铁列克得、石屋矿化斑岩体的时空差异、岩石成因和构造环境,并与邻区进行对比,探讨其成矿意义。论文取得以下主要成果：1、通过锆石LA-ICP-MS U-Pb定年获得加曼铁列克得岩体花岗闪长岩的结晶年龄为318.2±3.6Ma,石屋岩体花岗闪长斑岩、石英闪长岩的结晶年龄为322.1±1.5Ma、 322.4±1.5Ma,表明巴尔鲁克矿化斑岩体侵位的时代为晚石炭世。与包古图含矿斑岩体的形成时代相同,略晚于巴尔喀什地区含矿斑岩体。2、加曼铁列克得岩体由花岗闪长岩组成,具有高Al_2O_3、低MgO,高Sr、低Y,亏损HREE,弱Eu异常的类埃达克岩地球化学特点,属于准过铝质中钾钙碱性花岗岩。石屋岩体由花岗闪长斑岩和石英闪长岩组成。花岗闪长斑岩高Al_2O_3、低MgO、高Sr、低Y,亏损HREE,弱Eu异常,属于弱过铝质钙碱性-低钾拉斑系列过渡的花岗岩;石英闪长岩高Al_2O_3、富CaO、低MgO,高Sr、高Y,亏损HREE,弱Eu异常,属于准铝质钙碱性-低钾拉斑系列过渡的花岗岩类。3、加曼铁列克得、石屋矿化斑岩体形成于晚石炭世俯冲背景下的岛弧环境。它们具有相同的源区,可能是达拉布特洋壳向北俯冲至地幔楔下部,俯冲洋壳板片和沉积物脱水产生的流体和熔体,在上升过程中与地幔楔共同作用形成的产物。4、巴尔鲁克地区矿化斑岩体属于同一构造-岩浆-成矿带,区内断裂构造发育,岩体蚀变较强烈,表明区内流体活动比较强烈,为斑岩型铜矿化提供了必要的构造、岩浆、物源和流体条件。同时,其大地构造环境、岩体特征、时空演化、源区特征等跟巴尔喀什、包古图斑岩型矿床的含矿岩石相类似,表明区内斑岩型矿床可能为巴尔喀什成矿带的东延部分,暗示区内斑岩型矿床找矿具有很大前景。晚石炭世中酸性斑岩体,可能是寻找斑岩型铜、钼(金)的目标地质体。
[Abstract]:Baluk area is located in the western margin of Xinjiang, bordering the Balkesh metallogenic belt in Kazakhstan and Baogutu metallogenic area in the east. On the basis of previous work, through field geological investigation, petrography, geochemistry, isotopic tracer and zircon U-Pb chronology, the authors have determined the temporal and spatial differences of the Camantellede and Shiwu mineralized porphyry bodies. The petrogenesis and tectonic environment are compared with the adjacent areas to discuss its metallogenic significance. The main results are as follows: 1. The crystallization age of the granodiorite in the Kalmanterek rock body is 318.2 卤3.6 Ma, and the granodiorite porphyry in Shiwu rock body is obtained by zircon LA-ICP-MS U-Pb dating. The age of crystallization of quartz diorite is 322.1 卤1.5 Maand 322.4 卤1.5Ma. it indicates that the emplacement age of Barluk mineralization porphyry is late Carboniferous. The ore-bearing porphyry body in Baogutu was formed in the same time as the porphyry body in Baogutu, and was slightly later than the porphyry rock body in the Balkashi area. 2. The Kamandelike rock body is composed of granodiorite, with high Al_2O_3, low MgO, high Sr, low Y, and depleted HREE,. The geochemical characteristics of the weak Eu anomaly are similar to those of the adake-like rocks and belong to the quasi-peraluminous medium potassium calc-alkaline granites. Shiwu rock body is composed of granodiorite porphyry and quartz diorite. Granodiorite porphyry is high Al_2O_3, low MgO, high Sr, low Y. depleted HREE, weak Eu anomaly belongs to weak peraluminous calc-alkaline-low potash transition granite; Quartz diorite is high in Al_2O_3, rich in CaO, low in MgO, high in Sr, high in Y. and depleted in HREE, weak Eu anomaly. Shiwu mineralization porphyry was formed in the island arc environment of late Carboniferous subduction. They share the same source, probably resulting from the northward subduction of the Dalabut oceanic crust to the lower mantle wedge, the subduction of fluids and melts from ocean crust plates and sediment dehydration, and the interaction between the mantle wedge and the mantle wedge during the rise. The mineralized porphyry in Balluk area belongs to the same tectonic-magmatic metallogenic belt, where the fault structure is developed and the alteration of the rock mass is strong, which indicates that the fluid activity in the area is relatively strong, which provides the necessary structure for porphyry type copper mineralization. Source and fluid conditions. At the same time, the geotectonic environment, rock mass characteristics, space-time evolution and source area characteristics are similar to the ore-bearing rocks of the Baykash and Baogutu porphyry deposits, indicating that the porphyry deposits in the area may be the eastward extension of the Balkashi metallogenic belt. It is suggested that porphyry deposit prospecting has great prospect in this area. The late Carboniferous intermediate-acid porphyry may be the target geological body for porphyry copper and molybdenum (gold).
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P612
本文编号：2412320
[Abstract]:Baluk area is located in the western margin of Xinjiang, bordering the Balkesh metallogenic belt in Kazakhstan and Baogutu metallogenic area in the east. On the basis of previous work, through field geological investigation, petrography, geochemistry, isotopic tracer and zircon U-Pb chronology, the authors have determined the temporal and spatial differences of the Camantellede and Shiwu mineralized porphyry bodies. The petrogenesis and tectonic environment are compared with the adjacent areas to discuss its metallogenic significance. The main results are as follows: 1. The crystallization age of the granodiorite in the Kalmanterek rock body is 318.2 卤3.6 Ma, and the granodiorite porphyry in Shiwu rock body is obtained by zircon LA-ICP-MS U-Pb dating. The age of crystallization of quartz diorite is 322.1 卤1.5 Maand 322.4 卤1.5Ma. it indicates that the emplacement age of Barluk mineralization porphyry is late Carboniferous. The ore-bearing porphyry body in Baogutu was formed in the same time as the porphyry body in Baogutu, and was slightly later than the porphyry rock body in the Balkashi area. 2. The Kamandelike rock body is composed of granodiorite, with high Al_2O_3, low MgO, high Sr, low Y, and depleted HREE,. The geochemical characteristics of the weak Eu anomaly are similar to those of the adake-like rocks and belong to the quasi-peraluminous medium potassium calc-alkaline granites. Shiwu rock body is composed of granodiorite porphyry and quartz diorite. Granodiorite porphyry is high Al_2O_3, low MgO, high Sr, low Y. depleted HREE, weak Eu anomaly belongs to weak peraluminous calc-alkaline-low potash transition granite; Quartz diorite is high in Al_2O_3, rich in CaO, low in MgO, high in Sr, high in Y. and depleted in HREE, weak Eu anomaly. Shiwu mineralization porphyry was formed in the island arc environment of late Carboniferous subduction. They share the same source, probably resulting from the northward subduction of the Dalabut oceanic crust to the lower mantle wedge, the subduction of fluids and melts from ocean crust plates and sediment dehydration, and the interaction between the mantle wedge and the mantle wedge during the rise. The mineralized porphyry in Balluk area belongs to the same tectonic-magmatic metallogenic belt, where the fault structure is developed and the alteration of the rock mass is strong, which indicates that the fluid activity in the area is relatively strong, which provides the necessary structure for porphyry type copper mineralization. Source and fluid conditions. At the same time, the geotectonic environment, rock mass characteristics, space-time evolution and source area characteristics are similar to the ore-bearing rocks of the Baykash and Baogutu porphyry deposits, indicating that the porphyry deposits in the area may be the eastward extension of the Balkashi metallogenic belt. It is suggested that porphyry deposit prospecting has great prospect in this area. The late Carboniferous intermediate-acid porphyry may be the target geological body for porphyry copper and molybdenum (gold).
【学位授予单位】：西北大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P612
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