褚志远, 王伟德, 吕青, 刘卫东, 康丛轩, 王树星. 山东蒙阴坡里地区金伯利岩带形成时代——来自辉绿岩锆石U-Pb定年数据的证据[J]. 地质通报, 2019, 38(1): 44-50.
    引用本文: 褚志远, 王伟德, 吕青, 刘卫东, 康丛轩, 王树星. 山东蒙阴坡里地区金伯利岩带形成时代——来自辉绿岩锆石U-Pb定年数据的证据[J]. 地质通报, 2019, 38(1): 44-50.
    CHU Zhiyuan, WANG Weide, LÜ Qing, LIU Weidong, KANG Congxuan, WANG Shuxing. The formation age of the kimberlite zone in Poli area of Mengyin, Shandong Province: Zircon U-Pb dating data of diabase[J]. Geological Bulletin of China, 2019, 38(1): 44-50.
    Citation: CHU Zhiyuan, WANG Weide, LÜ Qing, LIU Weidong, KANG Congxuan, WANG Shuxing. The formation age of the kimberlite zone in Poli area of Mengyin, Shandong Province: Zircon U-Pb dating data of diabase[J]. Geological Bulletin of China, 2019, 38(1): 44-50.

    山东蒙阴坡里地区金伯利岩带形成时代——来自辉绿岩锆石U-Pb定年数据的证据

    The formation age of the kimberlite zone in Poli area of Mengyin, Shandong Province: Zircon U-Pb dating data of diabase

    • 摘要: 金伯利岩是化学成分、矿物组成和结构多变的混杂岩,极易发生蚀变,因此对金伯利岩全岩及各种矿物进行测年的方法很难确定金伯利岩的侵位年龄,且数据结果差别很大。通过分析蒙阴坡里金伯利岩带与辉绿岩的侵入关系,以及辉绿岩锆石U-Pb测年,结合辉绿岩与上覆灰岩的接触关系及金刚石砂矿储集层与已知金刚石原生矿的关系,确定辉绿岩脉的侵位时代为中生代燕山晚期,证实坡里金伯利岩带形成时代为中生代燕山晚期而非加里东期。

       

      Abstract: Kimberlite is a kind of melange with changeable chemical composition, mineral composition and structure and tends to be altered. Therefore, it is difficult to determine the emplacement age of kimberlite by dating kimberlite whole rock and all kinds of minerals, and the data obtained are very different. In this paper, the intrusive relationship between kimberlite zone and diabase in Poli of Mengyin was analyzed. Through dating the zircon U-Pb in diabase and studying the contact relationship between diabase and overlying limestone as well as the relationship between diamond sand reservoir and known diamond protoores, the emplacement age of diabase vein was determined to be the Late Yanshanian period of Mesozoic. Therefore, it is proved that the Poli kimberlite belt was formed in Late Yanshanian rather than in Caledonian period.

       

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