Sedimentology and age on profile Lz1023

A 270 cm long sediment sequence was recovered with a piston corer from east lobe Bonney, Taylor Valley, Antarctica, and characterized according to its sedimentological, mineralogical, and geochemical properties. It is the first record of such length recovered from east lobe Bonney. The sediment core is mainly composed of halite crystals of different sizes, water, and a relatively low and stable proportion of clastic particles. Although the sediment surface was probably disturbed by the coring process and absence or low contents of organic material or carbonates hampers the establishment of a robust chronology by radiocarbon dating, the core probably contains at least several hundred years of information about the history of the lake and the Bonney basin. Variations in halite crystal sizes and amount as well as variations in the composition of clastic material can be related to past lake level changes and evaporation cycles.

研究人员利用活塞式取芯器（piston corer）从南极洲泰勒谷（Taylor Valley）的邦尼东支（East Lobe Bonney）获取了一段长270厘米的沉积序列，并对其沉积学、矿物学及地球化学特征进行了系统表征。该序列是首次从邦尼东支获取的该长度级别的沉积记录。该沉积岩心主要由不同粒径的石盐（halite）晶体、水体以及占比相对较低且稳定的碎屑颗粒组成。尽管取芯过程可能扰动了沉积层表面，且有机质与碳酸盐的缺失或含量极低，导致无法通过放射性碳测年法（radiocarbon dating）建立可靠的年代序列，但该岩心仍蕴含了至少数百年以来的湖泊及邦尼盆地的演化历史信息。石盐晶体的粒径、含量变化以及碎屑物质的组成差异，均可与历史时期的湖泊水位变化及蒸发循环过程建立关联。