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通过实验研究,笔者确定了激光烧蚀等离子体质谱法直接测定探针片中锆石、磷灰石U-Pb同位素年龄的流程,包括样品制备、矿物成因分析、仪器测试条件和测试过程。该方法最大的优势在于,可在探针片上确定测年矿物的共生组合及地质意义,将测得的年龄与特定地质事件,如变质事件、热液事件等相联系,对年龄数据给予合理的地质解释。利用此方法对一些岩石中的锆石、磷灰石在探针片上进行了测试,与用传统单矿物制靶方法测试的结果在误差范围内一致,表明在探针片上进行含铀矿物原地原位U-Pb测年是完全可行的。
Through experimental research, the author determined the laser ablation plasma mass spectrometry direct determination of zircon and apatite U-Pb isotope age process, including sample preparation, mineral analysis, instrument testing conditions and testing process. The biggest advantage of this method is that it is possible to determine the symbiotic assemblage and geologic significance of the dating minerals on the probe sheet. Associating the measured ages with specific geological events, such as metamorphic events and hydrothermal events, Geological explanation. Using this method, the zircon and apatite in some rocks were tested on the probe chips. The results of the tests were consistent with those of the conventional single-mineral target method within the error range, indicating that the zirconium and apatite- In-situ U-Pb dating is entirely feasible.