Abstract We have analyzed 141 grains of pyrope from Neogene sediments in a quarry of construction materials, in the Kenkeme River catchment, along its left-side tributary (Chakiya River), about 60 km northwest of Yakutsk city. The mineral chemistry patterns of pyropes are typical of Jurassic–Cretaceous barren kimberlites, like the pipes of Obnazhennaya or Muza, but are uncommon to diamondiferous Middle Paleozoic kimberlites. The results allow identifying the magmatic event and placing time constraints on kimberlite magmatism in the southeastern flank of the Vilui basin, which was part of the Late Jurassic–Early Cretaceous tectonic-magmatic event in northeastern Asia.

中文翻译：

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Vilui盆地西南翼的金伯利质岩浆作用

摘要 我们在位于雅库茨克市西北约 60 公里处的肯克梅河集水区，沿其左侧支流（恰基亚河）的一处建筑材料采石场分析了新近纪沉积物中的 141 粒硅镁石。萤石的矿物化学模式是侏罗纪-白垩纪贫瘠金伯利岩的典型特征，如 Obnazhennaya 或 Muza 的管道，但在含金刚石的中古生代金伯利岩中并不常见。结果允许识别岩浆事件并对 Vilui 盆地东南侧的金伯利岩岩浆活动施加时间限制，该盆地是亚洲东北部晚侏罗世-早白垩世构造岩浆事件的一部分。