We compare the sediment magnetic properties of two lakes in Schirmacher Oasis, East Antarctica and discuss the intensity of pedogenesis during the Late Quaternary. The magnetic minerals are land-derived with no obliteration of the signal due to bacterial or anthropogenic sources. The magnetic grains of Lake L-49 are much smaller in size compared to Lake Sandy's (low ratio values of IRM_20mT/ARM and S₂₀ ). The iron oxide minerals in Lake Sandy's sediments are coarse stable single domain (SSD) and multi-domain (MD) grains with the SSD concentration increasing during the Holocene. Percentage frequency-dependent susceptibility, a marker for pedogenic iron oxide minerals shows a similar trend for Lake Sandy, with the values remaining low during the Last Glacial Stage (LGS) and increasing towards the Holocene. Such a pattern is not observed in the sediments of Lake L-49. Principal Component Analysis reveals a relatively stronger intensity of pedogenesis in the Lake Sandy catchment during the deglaciation. From the data, we observe that even though pedogenesis is active, the intensity is not strong enough to form superparamagnetic (SP) grains. The peaks in χ_fd for both the lakes show a direct relationship with Antarctic Isotope Maximum events recorded in an ice-core data suggesting that χ_fd can be used as a proxy for paleo-pedogenesis in Antarctica.

我们比较了南极东部 Schirmacher 绿洲中两个湖泊的沉积物磁性，并讨论了晚第四纪的成土强度。磁性矿物来源于陆地，信号不会因细菌或人为来源而消失。与桑迪湖相比，L-49 湖的磁性颗粒尺寸要小得多（IRM _20mT /ARM 和 S _{20 的}低比率值）。桑迪湖沉积物中的氧化铁矿物为粗稳定单域（SSD）和多域（MD）颗粒，SSD浓度在全新世期间增加。百分比频率相关的磁化率，土壤氧化铁矿物的一个标记，在桑迪湖中显示出类似的趋势，在末次冰期 (LGS) 期间该值保持较低，并在全新世期间增加。在 L-49 湖的沉积物中没有观察到这种模式。主成分分析揭示了冰消期桑迪湖流域的成土强度相对较强。从数据中我们观察到，尽管成土作用活跃，但强度不足以形成超顺磁性（SP）颗粒。χ _{fd 中}的峰值这两个湖泊都显示出与冰芯数据中记录的南极同位素最大值事件的直接关系，这表明 χ _fd可以用作南极洲古土壤形成的代理。