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中文摘要：
通过对扬子克拉通北缘西乡-碑坝小区寒武纪．侏罗纪碎屑沉积岩的Mo、Nd同位素进行测定，结合微量元素数据分析，结果表明，该区寒武纪-侏罗纪碎屑沉积岩的δ^98Mo变化范围在-0．65‰～＋1．87‰之间，εNd（t）变化范围在-1．46--10．90之间．茅口组晚期一个样品（4820）具有相对偏正的δ^98Mo和εNd（t）（0．97‰，-1．46），有可能与二叠纪晚期峨眉山地幔柱的喷发过程中，扬子克拉通北缘古海水中富集的大量硫化氢有关，此时海水中的MoO4^2-转变为MoSa4^2-，并具有偏正的Mo同位素组成．晚二叠世长兴期样品（4814）也具有明显偏正的δ^98Mo（1．87‰），但εNd（t）相对偏负（-10．90），并具有相对较高的总有机碳（TOC）含量和总硫含量（TS）（分别为1．52％，2．02％），暗示该时期具有较高的初级生产力和有机碳埋藏量，似乎表明脱硫酸还原作用产生的大量HS^-，H2S与同期海相沉积岩明显偏正的δ^98Mo有一定的耦合性．研究显示，古大陆边缘碎屑沉积岩的Mo同位素变化，与区域构造活动及产生的环境效应存在一定的相关性，可以作为指示区域古环境演化的有效示踪剂．
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