| 原位LA-ICP-MS磷灰石裂变径迹实验流程建立与应用 |
| 投稿时间：2023-11-12 修订日期：2024-01-14 点此下载全文 |
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| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要:原位LA-ICP-MS(激光剥蚀-电感耦合等离子质谱）磷灰石裂变径迹测试技术以其安全、高效的优势逐渐成为国内外热年代学实验室广泛使用的方法。在对比分析磷灰石裂变径迹定年使用的外探测器法和原位LA-ICP-MS法原理基础上，本研究改进了磷灰石裂变径迹制样方式，并介绍了中国石油大学（北京）热年代学实验室建立的LA-ICP-MS磷灰石裂变径迹实验流程。利用新建立的测试流程分析磷灰石国际标样Fish Canyon Tuff和Durango得到其年龄分别为28.70±2.70Ma(2σ,MSWD=0.63）和32.01±0.52Ma(2σ,MSWD=0.91），与其推荐年龄在误差范围内一致。采用LA-ICP-MS方法对延庆千家店盆地侏罗系样品进行分析，7个样品磷灰石裂变径迹年龄介于91.18-74.28Ma,与前人使用外探测器法测年结果基本相同，通过热史模拟揭示出燕山地区西段在侏罗纪以来经历了140-130Ma和100-0Ma两期冷却事件。研究表明实验室新建立的原位LA-ICP-MS磷灰石裂变径迹实验流程可靠，相比传统外探测器法有更广阔的应用前景。 |
| 中文关键词:磷灰石 裂变径迹定年 原位LA-ICP-MS法 实验流程 国际标样 构造-热演化 |
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| In-situ LA-ICP-MS Apatite Fission Track Experiment Procedure Development and Application |
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| Abstract:The in-situ LA-ICP-MS (laser ablation-inductively coupled plasma mass spectrometry) apatite fission track dating technique has gradually become widely used in thermochronology laboratories due to its safety and efficiency advantages. Based on analysis of the principles of the external detector method and the in-situ LA-ICP-MS method, this study has improved the sample preparation procedures for apatite fission track dating and introduced the experimental protocols for in-situ LA-ICP-MS apatite fission track dating established in the thermochronology laboratory of China University of Petroleum (Beijing). Using the newly established testing procedure, the international reference samples Fish Canyon Tuff and Durango were analyzed, yielding ages of 28.70±2.70 Ma (2σ, MSWD=0.63) and 32.01±0.52 Ma (2σ, MSWD=0.91), respectively. These ages are consistent with the recommended ages within the error range. When applying the LA-ICP-MS method to analyze Jurassic samples from the Qianjiadian basin in Yanqing district, 7 apatite fission track ages ranged from 91.18 to 74.28 Ma, which are in good agreement with the results obtained using the external detector method by previous researchers. Through thermal history modeling, it was revealed that the western segment of the Yanshan region experienced two cooling events: 140-130 Ma and 100-0 Ma, since the Jurassic period. This study demonstrates that the newly established in-situ LA-ICP-MS apatite fission track dating experimental procedure in the laboratory is reliable and offers broader application prospects compared to traditional external detector methods. |
| keywords:apatite fission track dating in-situ LA-ICP-MS method international reference samples tectono-thermal evolution |
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