Abstract—Studies have shown that the concentration of heavy carbon isotope in the organic matter (OM) in the surface layer of the marine sediment increases and the amount of terrigenous OM decreases by about 1.4 times with increasing distance from the Indigirka River delta from 50 km to 600 km. This is accompanied by 1.3–2.1 times decrease of heavy metals and 1.3–1.4 times decrease of rare-earth elements (REE). A strong correlation is observed between the contents of OM, heavy metals, and REE in marine sediments, with the exception of the Cd and W contents. At a distance of 50 km from the river delta, the heavy metals contents exceed their Earth’s crust clarke values, while REE contents are higher than those of the North American Shale Composite (NASC). The opposite pattern is observed at a distance of 600 km from the river delta.

中文翻译：

---

距英迪吉尔卡河三角洲不同距离的海洋沉积物中有机物、重金属和稀土元素的积累

摘要——研究表明，随着距英迪吉尔卡河三角洲 50 km 的距离增加，海洋沉积物表层有机质（OM）中重碳同位素浓度增加，陆源 OM 量减少约 1.4 倍。到 600 公里。这伴随着重金属减少 1.3-2.1 倍，稀土元素（REE）减少 1.3-1.4 倍。除 Cd 和 W 含量外，海洋沉积物中 OM、重金属和 REE 的含量之间存在很强的相关性。在距河流三角洲 50 公里处，重金属含量超过其地壳克拉克值，而稀土元素含量高于北美页岩复合材料 (NASC)。在距河流三角洲 600 公里处观察到相反的模式。