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中文摘要：
华北克拉通破坏的时间一直是地质学家们争论的焦点问题之一．鲁西铁铜沟岩体中纯橄岩捕虏体的锆石SHRIMPU．Pb定年结果对此给出了制约．结果显示，4个纯橄岩样品的18颗锆石阴极发光图像中，15颗呈条痕状吸收，2颗具岩浆环带特点，结合它们的Th（49-3569gg／g，平均值为885gg／g），U（184~5398gg／g，平均值为1277gg／g）含量和Th／U比值（0．15-2．04），暗示岩浆成因特征．岩浆锆石的206pb／2粥U表面年龄分成5组：131-145，151-164，261-280，434-452和500。516Ma．131-145Ma年龄与寄主岩浆（铁铜沟岩体）的形成时代相一致；151-164Ma年龄对应于华北克拉通东部中．晚侏罗世少量幔源岩浆和主体的酸性岩浆事件；261-80Ma年龄与峨眉山大火成岩省的时代相类似；434-452Ma年龄与华北克拉通东部古生代时期富硅质岩浆的时代相一致；500-516Ma年龄可能是全球泛非事件在华北克拉通东部的响应．华北克拉通东部岩石圈地幔经历了多期次不同程度熔体的改造，其中以中生代晚期（131-164Ma）的改造最为强烈．
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