磷灰石裂变径迹年龄测试分析新方法——激光剥蚀-ICPMS法

doi:10.11743/ogg20130418

石油与天然气地质 ›› 2013, Vol. 34 ›› Issue (4): 550-557.doi: 10.11743/ogg20130418

磷灰石裂变径迹年龄测试分析新方法——激光剥蚀-ICPMS法

李天义^1,2, 周雁¹, 方石³, 何生², 何治亮⁴, 樊德华¹

1. 中国石化石油勘探开发研究院构造与沉积储层实验室, 北京 100083;
2. 中国地质大学构造与油气资源教育部重点实验室, 湖北武汉 430074;
3. 吉林大学地球科学学院, 吉林长春 130061;
4. 中国石化石油勘探开发研究院, 北京 100083

收稿日期:2012-09-03 修回日期:2013-07-08 出版日期:2013-08-28 发布日期:2013-08-27
作者简介:李天义,男(1982- ),博士,海相石油地质与含油气盆地热史分析。E-mail:tylicug@gmail.com。
基金资助:
国家自然科学基金重点项目(40739904);国家自然科学基金面上项目(41072093);中石化重大基础研究项目前瞻性项目(YPH08002);国家"十一五"科技重大专项(2011ZX05005-002);中国石化石油勘探开发研究院院控项目《激光剥蚀-ICPM裂变径迹定年技术研究》。

A new method for apatite fission track dating—the Laser-ICPMS method

Li Tianyi^1,2, Zhou Yan¹, Fang Shi³, He Sheng², He Zhiliang⁴, Fan Dehua¹

1. Laboratory of Structural and Sedimentological Reservoir Geology, Exploration & Production Research Institute, SINOPEC, Beijing 100083, China;
2. Key Laboratory of Tectonics and Petroleum Resource of Ministry of Education, China University of Geosciences, Wuhan, Hubei 430074, China;
3. College of Earth Sciences, Jilin University, Changchun, Jilin 130061, China;
4. Exploration & Production Research Institute, SINOPEC, Beijing 100083, China

Received:2012-09-03 Revised:2013-07-08 Online:2013-08-28 Published:2013-08-27

摘要/Abstract

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。

关键词: 磷灰石, 激光剥蚀, 电感耦合等离子体质谱, 裂变径迹定年

Abstract: In this paper,a new method for apatite fission track dating using Laser-ICPMS is introduced in detail.The fission 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 clastic 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 irradiation,mica ablation and induce fission rack accounting,the new method is more rapid and convenient than the traditional method,can shorten the cycle of testing,reduce the influence of human factors,and improve accuracy and reproducibility of the analysis results.However,the new method still has some uncertainties such as the influence of ablation on ²³⁸U content,depth of laser ablation,the influence of uneven U content and the selection of standard samples with similar property with apatite.

Key words: apatite, laser ablation, ICPMS, fission track dating

中图分类号:

TE132.1

李天义,周雁,方石,等. 磷灰石裂变径迹年龄测试分析新方法——激光剥蚀-ICPMS法[J]. 石油与天然气地质, 2013, 34(4): 550-557. doi: 10.11743/ogg20130418 Li Tianyi,Zhou Yan,Fang Shi,et al. A new method for apatite fission track dating—the Laser-ICPMS method[J]. Oil & Gas Geology, 2013, 34(4): 550-557. doi: 10.11743/ogg20130418

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磷灰石裂变径迹年龄测试分析新方法——激光剥蚀-ICPMS法

A new method for apatite fission track dating—the Laser-ICPMS method

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