Precise timing of lacustrine gypsum in Luobubo, Xinjiang using the thermal ionization mass spectrome

• 作 者: PENG Zicheng LIU Weiguo Zhang
• 机 构: Department of Earth and Space Science,Institute of Earth Environment,Second Branch
• 出 处: 科学通报
• 发表日期: 2004年期
• 关键词: thermal ionization mass spectrometry (TIMS) U-series dating gypsum mineral water

Dating techniques including gypsum dissolution in water, iron hydroxide co-precipitation with uranium and thorium and mass spectrometric determination have been investigated in this note. The ages of the gypsum samples in a CK core from Luobubo lacustrine sediments are in the range of (12.85 ± 0.21) kaBP (4 m distance from the top core) to (153.2± 7.2) kaBP (49 m distance from the top core)with the relative errors of ± 1.6%-± 4.7%. It indicates that the sedimental environment of the CK core was situated in the middle-late Pleistocene and Holocene periods, corresponding to 1--6 stages of oxygen isotopes in the abyssal sediments and included much information from last interglacial to Holocene warm periods.