东准噶尔双泉金矿LA-ICP-MS锆石U-Pb测年及赋矿岩石地球化学特征

东准噶尔双泉金矿LA-ICP-MS锆石U-Pb测年及赋矿岩石
地球化学特征
苏虎;弓小平;潘展超;韩琼;宋相龙;张燕波
【期刊名称】《新疆地质》
【年(卷),期】2015(33)2
【摘要】为了解双泉金矿成矿时代及成矿环境，分别对双泉金矿含金石英脉和赋
矿岩石进行采样测试分析。

高精度LA-ICP-MS锆石U-Pb法测年结果表明，双泉金矿含金石英脉加权平均206Pb/238U年龄为（303.53±0.79）Ma，代表了含金石英脉形成年龄，属晚石炭世前后挤压推覆构造体系产物。

与双泉金矿主成矿期年龄对比，结合矿区成矿条件及黄铁矿、毒砂等矿物形态特征，认为该金矿的形成不是一期结果，而是经历了预富集、富集的演化历程。

赋矿岩石地球化学分析结果表明，岩石的SiO2、K2O、CaO（SiO2=58.82%~89.25%，K2O=1.12%~4.47%，CaO=0.52%~4.47%）含量高，Na2O含量低（Na2O=0.43%~1.76%），
A/CNK值大于1，δ值小于3.3，属过铝质、钙碱性岩石，具富钾钙、贫钠镁特点；Ba相对Rb，Th亏损，K2O含量接近活动陆缘K2O含量，TiO2含量与岛弧
TiO2含量接近，推断岩体形成于活动陆缘或岛弧环境；稀土元素具弱的负Eu、负Ce异常，（La/Sm）N值较（Gd/Yb）N值大，轻稀土元素分馏程度高于重稀土元素，表明岩浆具壳幔混熔特点。

东准噶尔后碰撞阶段早石炭世至二叠纪晚期发生的陆-陆碰撞造山及伸展张弛构造运动可能是造成此结果的主要构造因素。

%In order to learn more about gold metallogenic epoch and metallogenic environment of the Shuangquan gold deposit,respectively carried on sample collection and analysis of gold-bearing quartz vein and ore
rock.High accuracy LA-ICP-MS zircon U-Pb dating results has shown that The auriferous quartz vein of Shuangquan gold deposit was formed at 303.53 ± 0.79 Ma,which represents the formation age of auriferous quartz vein,belonging to the thrust nappe structure system before and after the Late Carboniferous. At the same time compared with main ore-forming period age, combined with mining metallogenic conditions and minerals such as pyrite, arsenopyrite morphological characteristics, indicating the formation of the gold deposits is not a result of a period, but experienced a history of pre enrichment,en-richment.The host rocks geochemical analysis results has shown that the content of SiO2, K2O, CaO(SiO2= 58.82%~89.25%,K2O=1.12%~4.47%,CaO=0.52%~4.47%)of rock were high, the content of Na2O was low(Na2O=0.43%~1.76%),A/CNK values were greater than 1,the delta value is less than 3.3,belong to the type of aluminium,calcium alka-line rocks,has the characteristics of the rich potassium and calcium,poor sodium and magnesium;Ba loss relative to Rb, Th,K2O content is close to the activities of terrigenous K2O content,TiO2 content is close to that of island arc,inters rock formed in the island arc environment activities terrigenous;Rare earth elements have weak loss of negative Eu and Ce anomalies,(La/Sm) N values were greater than (Gd/Yb) N value, and light rare earth compared with heavier rare earth is right skewed distribution curve is steep, explains the characteristics of magma with crust mantle melting,the collision stage of Early Carboniferous to Permian Eastern Junggar the continent-continent collision and after that,extensional tec-tonic movement may be the main Structural factors.
【总页数】7页(P212-218)
【作者】苏虎;弓小平;潘展超;韩琼;宋相龙;张燕波
【作者单位】新疆大学，新疆乌鲁木齐 830049;新疆大学，新疆乌鲁木齐830049;新疆大学，新疆乌鲁木齐 830049;新疆大学，新疆乌鲁木齐 830049;新疆大学，新疆乌鲁木齐 830049;新疆大学，新疆乌鲁木齐 830049
【正文语种】中文
【中图分类】P59
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