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中文摘要：
详细介绍了一种全新的磷灰石裂变径迹表观年龄测试分析方法——激光剥蚀-ICPMS法。通过新、老方法测试分析结果对比,认为两种方法所获得3种标准样品磷灰石裂变径迹表观年龄基本一致;测试分析的4块钻井碎屑岩样品表观年龄、单颗粒年龄及U含量的分布特征也基本一致。样品两组年龄均反映同一期构造抬升冷却事件。通过新、老方法测试分析流程对比认为,激光剥蚀-ICPMS法测定磷灰石裂变径迹表观年龄,省去热中子辐照、云母片外探测器蚀刻及诱发径迹统计等诸多程序,比传统的外探测器法步骤更为快捷、方便,缩短了样品测试分析的周期,降低了人为因素对测试结果的影响,更能确保样品测试结果的准确性和可再现性,有可能成为未来裂变径迹定年的主流实验方法。然而,目前激光剥蚀-ICPMS法裂变径迹定年在径迹蚀刻是否对磷灰石颗粒中238U含量造成影响、激光剥蚀深度、磷灰石颗粒U含量不均匀性及与磷灰石性质相似的标准样品选取等方面仍然存在问题,需进一步加强研究。
英文摘要：
In this paper, a new method for apatite fission track dating using Laser-ICPMS is introduced in detail. The fis- sion track ages of three international standard samples determined by using the new method and the conventional external detector method are basically in consistency. The test results of four elastic rock core samples, including apparent fission track ages, single grain ages and U contents are also basically the same for the new and conventional methods. The two group of ages may reflect the same tectonic uplift cooling event. As it eliminates several steps such as thermal neutron ir- radiation, mica ablation and induce fission rack accounting, the new method is more rapid and convenient than the tradi- tional method, can shorten the cycle of testing, reduce the influence of human factors, and improve accuracy and repro- ducibility of the analysis results. However, the new method still has some uncertainties such as the influence of ablation on 238 U content, depth of laser ablation, the influence of uneven U content and the selection of standard samples with similar property with apatite.
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