Abstract
The paper focused on the study of detrital yellow layer from sediment profile D3 of DaQaidam Salt Lake, based on AMS 14C chronologic and mineralogical methods, aimed to discuss the dust storm events recorded by detrital yellow layer of DaQaidam region since Late Glacial period. The results showed that the grain-size distribution curve displayed double kurtosis, the main peak (10 µm in average) reflected the fine-grained fractions into lake by fluviation, and the secondary peak (> 32 µm) reflected the coarse silt fractions into lake by wind effect and fluviation. Finally, the coarse-grained fractions (> 64 µm) from sediment profile D3 probably recorded the dust storm events since Late Glacial period.
Highlights
DaQaidam Salt Lake, a perennial water-body and salt playa, is located in a sub-basin of northern Qaidam Basin
We report the results of sediment profile D3 from the centeral of DaQaidam Salt Lake in Qaidam Basin, using the mineralogical records, as well as AMS 14C chronologic method, which aims to discuss the dust storm events in DaQaidam region recorded by detrital yellow layer from sediment profile D3 since Late Glacial period
The results showed that the grain-size distribution of lake sediment from profile D3 mainly ranged from 0 to 64 μm, and the average grain size is raletively smaller with a range of 7.2~35.3 μm
Summary
DaQaidam Salt Lake, a perennial water-body and salt playa, is located in a sub-basin of northern Qaidam Basin. The closed lake sediment, especially in arid and semiarid regions, which provided a proxy to reconstruct the regional dust storm events or sandstorms that occurred in historical periods [1,2,3,4]. The grain-size compositions of lake sediment were considered as good indicators for drought events and wind field conditions in geological history [5,6,7]. We report the results of sediment profile D3 from the centeral of DaQaidam Salt Lake in Qaidam Basin, using the mineralogical records, as well as AMS 14C chronologic method, which aims to discuss the dust storm events in DaQaidam region recorded by detrital yellow layer from sediment profile D3 since Late Glacial period
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