LA-ICPMS 在现场测定全新纪斯塔拉格米特的U-Th年代
Chung-Che Wu1,2, Chuan-Chou Shen3, Detlef Günther2
1Jiangsu Key Laboratory of Ocean-Land Environmental Change and Ecological Construction, School of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China.
Analytical chemistry
|July 23, 2024
概括
这项研究引入了一种新的 in situ - (U-Th) 测年法,用于使用激光切除-ICP-MS. 这种技术可以准确地测定过去一千年的石,这对古气候和考古学研究非常有价值.
科学领域:
- 地质化学 地质化学
- 地质时间学 (Geochronology)
- 古气候学 古气候学
背景情况:
- 碳酸盐洞穴的精确约会对于重建过去的环境变化至关重要.
- 传统的U-Th测年方法可能耗时,需要样本溶解.
- 需要高精度的现场测年技术,适用于各种地质档案.
研究的目的:
- 开发和验证使用激光切除-ICP-MS.使用碳酸盐洞穴的新型现场U-Th约会方法.
- 评估年轻石石约会的新方法的准确性和精度.
- 证明该方法在各种科学学科中的适用性.
主要方法:
- 使用激光除-诱导合等离子体质谱法 (LA-ICPMS) 进行现场分析.
- 采用了229Th-233U-236U同位素的三倍,用于在线校正仪器质量歧视和U/Th分离.
- 通过准确地复制已知的世俗平衡比率并将结果与基于常规溶液的U-Th测年方法进行比较,验证了该方法.
主要成果:
- 在U-Th年代测定洞穴物中获得了高精度,在世俗平衡样本中,234U/238U的±0.053和230Th/238U的±0.050的两西格玛不确定性.
- 成功确定了个体岩层的形成年龄,从210年前到1000年前 (ka).
- 证明了高精度的约会Holocene石年仅1ka,与2标准误差±76年.
结论:
- 在现场开发的U-Th约会方法提供了一个精确和准确的方法来约会洞穴物.
- 这种微域约会技术适用于各种研究领域,包括古气候学,海洋学,地磁学和考古学.
- 该方法为高分辨率的古老环境重建提供了有价值的工具.
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