| 全自动40Ar/39Ar激光探针定年系统空白本底与微量样品定年 |
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| 关键词:Peking University 40Ar/39Ar laser probe dating system system blank level small sample dating |
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| System Blank Level and Small Sample Dating in the All-Automatic 40Ar/39Ar Laser Probe Dating System |
| The level of system blank is always the key point in 40Ar/39Ar dating of small samples and small area dating. Laboratory standard ZBH-25 biotite was dated on the all-automatic 40Ar/39Ar laser probe dating system in Key Laboratory of Orogenic Belts and Crustal Evolution (Peking University)，Ministry of Education. Total fuse of one, three and five small biotite grains by focused laser and step-heating with four, nine, fourteen, nineteen and twenty-four argon-release steps of seven grains by defocused laser were experimentally carried out. Signal intensity and system blank of five argon isotopes obtained indicate that the system blank level adopted by the authors is low enough to get a reasonable isochron age for single mineral grains frown Mesozoic or older samples. The system blank level is also suitable for focused laser in-situ dating. Young samples of several million years old can be total-fuse dated if the number of grains is properly increased (for example, the number is 10 mineral grains)．The molecule of C3， a commom interference to 36Ar, can be eliminated after long time of operation. Under these conditions, the system is likely to be successful in step-heating dating of the single mineral grain. |
| GAO Honglin.2005.System Blank Level and Small Sample Dating in the All-Automatic 40Ar/39Ar Laser Probe Dating System[J].Acta Geoscientica Sinica,26(z1):39-43. |
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