Xitaijinair （XT） Salt Lake, located in the western Qaidam Basin, is significant for recon- structing the evolution of inland drying climate. However, the chronological and mineralogical records from this lake are ra...Xitaijinair （XT） Salt Lake, located in the western Qaidam Basin, is significant for recon- structing the evolution of inland drying climate. However, the chronological and mineralogical records from this lake are rare. This study investigated the chronology （accelerator mass spectrometry （AMS） 14C ages and optically stimulated luminescence （OSL） ages） and mineral compositions of sediment in the 240-cm-deep XT Section of the Xitaijinair Salt Lake region. The conclusions are drawn as follows： （1） Nine AMS 14C ages, ranging between 33 and 40 cal ka BP, are obviously younger than the two OSL ages （57.9 and 69.1 ka）. The 14C ages probably reflect contamination with modern carbon. （2） Both 14C and OSL ages indicate that the surface of Xitaijinair Salt Lake region has suffered erosion. （3） The se- diments of XT Section are composed of silicates （quartz, muscovite, clinochlore and albite）, carbonates （calcite, dolomite, and ankertie）, halite and gypsum.展开更多
基金supported by the National Natural Science Foundation of China(No.41402314)the KLSLRC(No.KLSLRC-KF-13-DX-11)+1 种基金the Youth Guidance Foundation of ISL-CAS(No.Y460261051)the China Geological Survey(No.12120113033029)
文摘Xitaijinair （XT） Salt Lake, located in the western Qaidam Basin, is significant for recon- structing the evolution of inland drying climate. However, the chronological and mineralogical records from this lake are rare. This study investigated the chronology （accelerator mass spectrometry （AMS） 14C ages and optically stimulated luminescence （OSL） ages） and mineral compositions of sediment in the 240-cm-deep XT Section of the Xitaijinair Salt Lake region. The conclusions are drawn as follows： （1） Nine AMS 14C ages, ranging between 33 and 40 cal ka BP, are obviously younger than the two OSL ages （57.9 and 69.1 ka）. The 14C ages probably reflect contamination with modern carbon. （2） Both 14C and OSL ages indicate that the surface of Xitaijinair Salt Lake region has suffered erosion. （3） The se- diments of XT Section are composed of silicates （quartz, muscovite, clinochlore and albite）, carbonates （calcite, dolomite, and ankertie）, halite and gypsum.
