Zircon U-Pb Age, Geochemical Characteristics and Geological Significance of Tonalite in Saibagou Gold Deposit, the Northern Margin of Qaidam
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摘要: 对赛坝沟英云闪长岩进行了LA-ICP-MS锆石U-Pb年龄测试及岩石地球化学分析。结果表明，英云闪长岩的形成年龄为（470.4±5.2）Ma，属中奥陶世。英云闪长岩SiO2含量为62.46%~64.19%，平均为63.20%，Al2O3含量为14.39%~15.01%，平均为14.71%，全碱含量（K2O+Na2O）为2.32%~3.55%，平均为3.08%，富Na贫K，铝饱和指数A/CNK值为1.09~1.26，属低钾钙碱性过铝质花岗岩。在原始地幔标准化微量元素蛛网图上，表现出Ba、Th等元素富集，Nb、P、Ti等元素强烈亏损。英云闪长岩稀土元素总量（ΣREE）偏低，轻重稀土分馏程度较低，Eu基本无异常，在球粒陨石标准化稀土元素配分模式图上，呈舒缓"右倾型"。结合区域构造演化史及英云闪长岩的形成年龄，认为赛坝沟英云闪长岩为I型花岗岩，形成于消减带陆缘弧构造环境。结合赛坝沟金矿的年代学研究，认为赛坝沟金矿成矿作用与中奥陶世英云闪长岩的岩浆活动并无成因联系。Abstract: This paper carried out the LA-ICP-MS zircon U-Pb age testing and analyzed the geochemical charateristics of Saibagou tonalite.The results show that the formation age of tonalite is(470.4±5.2)Ma,belonging to the Middle Ordovician. The SiO2 content of tonalite is between 62.46% and 64.19%,with an average of 63.20%; Al2O3 is between 14.39% and 15.01%,with an average of 14.71%; the total alkali content (K2O+Na2O) is 2.32% to 3.55%,with an average of 3.08%,rich in Na and poor in K; the aluminum saturation index A/CNK is between 1.09 and 1.26,being peraluminous granite of low potassium calcium-alkaline. In the original mantle standardized trace element cobweb diagram, Ba and Th are enriched,and Nb,P and Ti are strongly depleted.The total rare earth element (ΣREE) of tonalite is low and the degree of light and heavy rare earth fractionation is also low; Eu is no abnormal,the rare earth element distribution pattern is slightly "right-inclined" in the standardized spheroidal meteorite. Considering the regional tectonic evolution and the formation age of tonalite,it is believed that Saibagou tonalite is the I-type granite formed in the continental marginal arc tectonic environment of the subduction zone. Based on the chronological study of Saibagou gold deposit,it is concluded that there is no genetic relationship between the mineralization and the magmatism of tonalite in the middle Ordovician.
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