原位LA-ICP-MS磷灰石裂变径迹实验流程建立与应用  

Development and Application of In-situ LA-ICP-MS Apatite Fission Track Experiment Procedure

作　　者：李晨星 常健[1,2] 邱楠生[1,2] 曹世纪 张应鳞 郑立庆 LI Chenxing;CHANG Jian;QIU Nansheng;CAO Shiji;ZHANG Yinglin;ZHENG Liqing(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249;College of Geosciences,China University of Petroleum(Beijing),Beijing 102249;Shenzhen Branch,CNOOC China Ltd.,Shenzhen,Guangdong 518054;CNOOC Deepwater Development Ltd.,Shenzhen,Guangdong 518054)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中海石油(中国)有限公司深圳分公司,广东深圳518054 [4]中海石油深海开发有限公司,广东深圳518054

出　　处：《地球学报》2025年第2期471-482,共12页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目(编号:42272135,U19B6003);国家重点研发计划项目(编号:2021YFA0716003)联合资助。

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±2.70)Ma(2σ,MSWD=0.63)和(32.01±0.52)Ma(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91.18~74.28 Ma,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140~130 Ma和100~0 Ma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。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 owing 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.

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 

分 类 号：P584[天文地球—岩石学]