首页 | 本学科首页   官方微博 | 高级检索  
     检索      


U-Pb Zircon Geochronology with an Integrated LA-ICP-MS Microanalytical Workstation: Achievements in Precision and Accuracy
Authors:Luigi A Solari  Arturo Gómez-Tuena  Juan Pablo Bernal  Ofelia Pérez-Arvizu  Martin Tanner
Institution:Universidad Nacional Autónoma de México, Centro de Geociencias, Campus Juriquilla, 76001 Querétaro, QRO, Mexico;Universidad Nacional Autónoma de México, Instituto de Geología, Ciudad Universitaria, 04510 México DF, Mexico
Abstract:Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) is a microanalytical tool especially suitable for providing fast and precise U-Pb geochronological results on zircon grains. A new 193 nm excimer laser adapted to a micromachining workstation, equipped with a newly designed two-volume ablation cell and coupled with a quadrupole ICP-MS, is presented here. The system was tuned routinely to achieve sensitivities in the range of 3000 cps/μg g?1 for 238U (< 2% RSD), with a 34 μm spot size, at 5 Hz and ~ 8 J cm?2, while ablating the NIST SRM 612 glass reference material. The system was capable of providing fast (< 1.5 minutes each analysis) and precise (generally < 1.5% 1s errors) 206Pb/238U zircon ages. The ages of widely used reference material zircons (Plesovice, 337 Ma; Temora, 416 Ma; R33, 418 Ma; Sri Lanka, 564 Ma; 91500, 1065 Ma) could be precisely matched, with an accuracy on isotopic ratios that ranged from ~ 2 to ~ 6%, depending on the homogeneity of the natural reference materials.
Keywords:geochronology  U-Pb  laser ablation  excimer  mass spectrometry
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号