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海螺沟现代冰碛物中的宇生核素10Be浓度分析

, PP. 956-961

Keywords: 宇生核素,残留影响,暴露年代,冰碛物,冰碛砾石,现代,冰川

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Abstract:

尽管许多学者都意识到继承性宇生核素对冰碛物暴露年代测量可能会带来一定的误差,然而影响究竟有多大,还缺乏对现代冰碛物宇生核素浓度的研究。对采自贡嘎山海螺沟冰川现代冰碛物碎屑和冰碛砾石的本地生宇生核素10Be浓度的分析表明,即使是海洋性冰川(暖底冰川),其冰碛物碎屑和冰碛砾石都残留一定量的本地生宇生核素;即使是具有明显磨蚀痕迹的现代冰碛砾石表面,也残留一定量的本地生宇生核素。因此,进行宇生核素测年时要给予充分的重视。当然,其冰碛物基质和具有明显磨蚀痕迹的现代冰碛砾石表面的本地生宇生核素10Be浓度比较低,一般不大于2×104atoms/g。对暴露年代的影响一般不大于0.61ka。尽管其适用范围还有待于更多的研究结果的进一步证实,但是却为残留影响的研究提供了一个研究的实例和一组可以参考的数据。

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