| 河流阶地样品中石英纯化和宇宙核素~(10)Be和~(26)Al分离方法研究 |
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| 引用本文： | 任静,李超,刘宇平,武振坤,任磊.河流阶地样品中石英纯化和宇宙核素~(10)Be和~(26)Al分离方法研究[J].岩矿测试,2018,37(3):275-282. |
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| 作者姓名： | 任静 李超 刘宇平 武振坤 任磊 |
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| 作者单位： | 自然资源部沉积盆地与油气资源重点实验室;中国地质调查局成都地质调查中心;国家地质实验测试中心;西安加速器质谱中心;中国石化集团西南油气分公司川西采气厂 |
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| 基金项目： | 中国地质调查局地质调查工作项目“湖南1：5万铁丝塘（G49E007020）、草市（G49E007021）、冠市街（G49E008020）、樟树脚（G49E008021）幅区域地质矿产调查”（12120113015500） |
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| 摘 要： | 经历反复埋藏暴露演化过程的河流阶地样品,难以用常规方法将原生宇宙核素10Be、26Al有效分离。本文在前人实验方法基础上,使用人工挑选、磁选仪分选及酸洗方法,分离样品中碳酸盐、含铁矿物及大气生成的10Be,进一步优化了石英提纯实验流程。结果表明:长度为9 cm、内径为1 cm的阴离子交换树脂装置匹配4 mol/L氢氟酸淋滤液,可将B、Mg、Ca、Cr、Fe、Mn、Ni、Ti和Be、Al有效分离,Be、Al回收率分别可达95.7%、85.7%。阳离子交换树脂能有效分离Be、Al,两元素回收率均达到85%。获得10Be/9Be和26Al/27Al流程空白分别为2.19×10-15和1.63×10-15。优化后的实验方法显著提高了河流阶地样品中原生宇宙核素10Be、26Al的纯化效率,且10Be/9Be和26Al/27Al流程空白数值与国内外实验室具有可比性。采用本方法获得了成都平原冲积物10Be、26Al暴露年龄分别是76.36±9.51 ka和69.44±14.13 ka,为评价龙门山前缘隐伏断裂构造特征和活动性提供了年代学依据。
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| 关 键 词： | 宇宙原生核素 10Be 26Al 纯化效率 加速器质谱 |
| 收稿时间： | 2017/10/31 0:00:00 |
| 修稿时间： | 2017/11/28 0:00:00 |
Study on the Method for Quartz Purification and Separation of Cosmogenic 10Be and 26Al in Samples from Fluvial Terraces |
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| REN Jing,LI Chao,LIU Yu-ping,WU Zhen-kun and REN Lei.Study on the Method for Quartz Purification and Separation of Cosmogenic 10Be and 26Al in Samples from Fluvial Terraces[J].Rock and Mineral Analysis,2018,37(3):275-282. |
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| Authors: | REN Jing LI Chao LIU Yu-ping WU Zhen-kun and REN Lei |
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| Institution: | Key Laboratory for Sedimentary Basin and Oil and Gas Resources, Ministry of National Resources, Chengdu 610082, China,National Research Center for Geoanalysis, Beijing 100037, China,Chengdu Geological Survey Center, China Geological Survey, Chengdu 610082, China,Xi''an Accelerator Mass Spectrometry Center, Xi''an 710061, China and Southwest Branch Company, China Petrochemical Corporation, Chengdu 610100, China |
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| Abstract: | In situ produced 10Be and 26Al in fluvial terrace samples that have been repeatedly buried and exposed to the evolution process are difficult to separate using conventional methods. Based on prior experiments, 10Be in carbonate, iron-bearing mineral and 10Be produced in the atmosphere were separated by manual hand picking, magnetic separator sorting and acid washing methods, improving the procedure of purifying the quartz samples. The results show that anion exchange column, with a length of 9 cm and inner diameter of 1cm, matched 4 mol/L hydrofluoric acid leachate, can effectively separate B, Mg, Ca, Cr, Fe, Mn, Ni, Ti and Mn. The recoveries of Be and Al are 95.7% and 85.7%, resepectively. Be and Al can be separated by ion exchange very well which have recoveries up to 85%. The procedure blanks are 2.19×10-15 and 1.63×10-15 for 10Be/9Be and 26Al/27Al, respectively which are comparable with other labs. The exposure ages of Chengdu Plain alluvial elements are 76.36±9.51 ka for 10Be and 69.44±14.13 ka for 26Al, which provides a chronological basis for evaluating the structural features and activities of buried faults in the front of the Longmenshan. |
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| Keywords: | in situ-produced cosmogenic 10Be 26Al recovery rate Accelerator Mass Spectrometry |
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