Age-depth relation of sediment core 2008-3 from Lake Big Yarovoe in Kulunda, southern West Siberia, Russia@en

In 2008, a 404 cm long sediment core (2008-3) was recovered from 8 m depth in the southern part of Lake Big Yarovoe. It consists mostly of striated black, grey and greenish-grey silts. The poor organic content of Lake Big Yarovoe sediments posed a problem for radiocarbon dating, but the problem was solved with a geomagnetic approach. A record of geomagnetic inclinations from the studied core was compared with Holocene records of inclinations from Lake Biwa, Japan. The age model of Lake Biwa is based on two widespread tephra layers: Kawagodaira (3.15 ka BP) and Kikai-Akahoya (7.25 ka BP) (Ali et al., 1999). To produce an adequate age-depth model for Lake Big Yarovoe, we transferred the ages of the extremes that the two geomagnetic curves have in common from the Lake Biwa age model to the Lake Big Yarovoe record. For more detailed information see Rudaya et al., 2012.2008年，研究人员从亚罗耶大湖（Lake Big Yarovoe）南部水深8米处采集了一根长404厘米的沉积岩芯（编号2008-3），该岩芯主体由具条纹构造的黑色、灰色及灰绿色粉砂组成。亚罗耶大湖沉积物的有机碳含量极低，无法满足放射性碳定年的要求，但通过地磁定年方法成功解决了这一难题。我们将该研究岩芯的地磁倾角记录，与日本琵琶湖（Lake Biwa）的全新世地磁倾角记录进行了对比。琵琶湖的年代模型基于两层分布广泛的火山碎屑层：川平台（Kawagodaira，距今3.15 ka BP）与鬼界赤海湾（Kikai-Akahoya，距今7.25 ka BP）（Ali等，1999）。为构建亚罗耶大湖可靠的年代-深度模型，我们将两条地磁曲线共有的极值点年代从琵琶湖的年代模型迁移至亚罗耶大湖的地磁记录中。更多详细信息可参见Rudaya等（2012）的研究成果。