新疆于田县阿羌火山岩的时代再讨论

    A discussion on the age of Aqiang volcanic rocks from Yutian County, Xinjiang

    • 摘要: 阿羌火山岩作为一个独立的地质构造单元在西昆仑的地质演化中扮演着重要的角色。为了调查阿羌火山岩的年龄,在阿羌火山岩的不同部位中采集了5件样品,进行LA-MC-ICP-MS锆石U-Pb定年。其中2件样品没有获得有效年龄,另外3件样品得到4个年龄数据:485Ma、461Ma、432Ma、145Ma,反映该带经历了加里东、华力西、燕山等运动。该结果对重新认识和研究西昆仑的地质演化历史具有重要的地质意义。

       

      Abstract: As an independent geological tectonic unit, the Aqiang volcanic rocks play an important role in the geological evolution of the West Kunlun Mountains. In order to study the ages of the Aqiang volcanic rocks, the authors collected five samples from different parts of the Aqiang volcanic rocks. The zircon U-Pb age was obtained by LA-MC-ICP-MS. Two of the samples failed to get effective zircon U-Pb ages, whereas four zircon U-Pb ages were obtained from the other three samples:485Ma, 461Ma, 432Ma, and 145Ma, suggesting that the belt experienced Caledonian, Variscan activities, such as Yanshanian movement. This result is of great significance for the study of the geological evolution history of West Kunlun Mountains.

       

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