Isotope Signature Of The Massive Ice Bodies On The Northeast Coast Of Chukotka Peninsula
Isotope Signature Of The Massive Ice Bodies On The Northeast Coast Of Chukotka Peninsula
复制标题
楚科奇半岛东北海岸巨大冰体的同位素特征
DOI：
10.24057/2071-9388-2021-020
复制
发表时间：
2019
影响因子：
--
通讯作者：
Nina N. Komova
中科院分区：
文献类型：
--
作者：
Y. Vasil'chuk;A. Maslakov;N. Budantseva;A. С. Vasil’chuk;Nina N. Komova
巨型冰体是楚科塔沿海平原上普遍存在的现象。虽然他们的研究始于20世纪30年代，但稳定同位素方法在冰床中的应用是最近才开始的。本文详细研究了楚科特卡最东北端(拉夫伦蒂亚定居点和库伦湖附近)MI小体的低温地层学和稳定氧、氢同位素组成。结果表明，所研究的MI体具有海内成因，很可能可追溯到更新世晚期。δ18O平均值为-18.5‰~-15‰，δ2 H平均值为-14 6‰~-12 8‰，高于该地区晚更新世冰体的预期，这很可能是由于封闭系统中饱和水沉积物冻结时的同位素分馏所致，当时形成的冰与初始水相比变得同位素丰富。MI的同位素值分析表明，初始水主要来自大气降水(降水、湖泊水和湖水)。
The massive ice (MI) bodies are widespread phenomena on Chukotka coastal plains. Although they have been studying since 1930s, stable isotope method was applied for the ice beds quite recently. In this study cryostratigraphy and stable oxygen and hydrogen isotope composition of MI bodies on the extreme North-Eastern Chukotka (near Lavrentiya settlement and Koolen’ lake) have been studied in detail. It was concluded that studied MI bodies have intrasedimental origin and most likely are dated back to the Late Pleistocene age. Mean δ18O values range from –18.5 ‰ to –15 ‰ whereas mean δ2 H values range from –146‰ to –128 ‰ that is higher than expected for the Late Pleistocene ice bodies in this region, which most likely resulted from isotopic fractionation during freezing of water-saturated sediments in a closed system when forming ice became isotopically enriched compared with initial water. The analysis of co-isotope ratios for MI shows that initial water is mainly of meteoric origin (precipitation, water of lakes and taliks).