摘要
全球气候变化已成为当前研究的热点问题,为预测未来气候的变化趋势,有必要对过去气候变化进行深入的研究,而这又基于可靠的年代学成果,故而年代尺度的高灵敏度、高精密度的测量成为当前迫切需要解决的课题之一。U-Th定年技术在14 C年代测定(通常仅适用于<50ka的沉积物年代测定)和39 Ar/40 Ar法或裂变径迹年代测定(一般用于>500ka的火山堆积物)之间提供了一种年代测定的桥梁。U-Th定年技术在50～500ka测年范围内是首选。主要介绍了国内外热电离质谱法(TIMS)U-Th定年技术、单接受器电感耦合等离子体质谱技术(SC ICP-MS)和多接受器电感耦合等离子体质谱法(MCICP-MS)、U-Th定年法在沉积物领域中的研究概况,并对α谱仪、TIMS、SC ICP-MS、MC ICP-MS U-Th定年技术在测量时间、测量精度、样品需要量等方面进行比较。
Abstact： Further research on past climate change based on a reliable geochronogical framework is es- sential for predicting the future trend of climate change. High-sensitivity and high-preeision measure- ment of age is one of the subjects urgent to solve. U-Th dating technique fills the gap between the 24C dating, which is only applicable to dating the sediments younger than 50 ka, and the 39Ar/40Ar meth- od or fission-track thermorchronology, which is usually applicable to the dating of volcanic deposits older than 500 ka. Up to date, the U-Th dating technique is the first choice for the sediments in age of 50 ka to 500 ka. This paper mainly introduces the current status of the U-Th dating technique using thermal ionization mass spectrometry（TIMS）, single-collector inductively coupled plasma mass spec- trometry（SC ICP-MS）and multi-collector inductively coupled plasma mass spectrometry（MC ICP-MS） respectively for sediments. Comparison of U-Th dating techniques with the methods of ^-spectrome- try,TIMS,SC ICP-MS and MC ICP-MS is also provided for time range,measurement precision and sample requirement.
出处
《海洋地质前沿》
2012年第12期17-24,共8页
Marine Geology Frontiers
基金
国家自然科学基金"西北冰洋沉积岩心精细年代框架构建及Th异常分析"(41076122)
