Structure and formation of ice-ground veins of the second lake-alluvial terrace in the North of Gydan in the late Neopleistocene–Holocene

IF 0.7 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Led i Sneg-Ice and Snow Pub Date : 2019-12-01 DOI:10.15356/2076-6734-2019-4-367

Ya. V. Tikhonravova, A. V. Lupachev, E. Slagoda, V. Rogov, A. Kuznetsova, V. Butakov, G. Simonova, N. Taratunina, D. Mullanurov

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引用次数: 2

Abstract

The syngenetic ice and ice-ground composite veins in khasyrey (alas) and interalas plateaus were studied on the second lake-alluvial terrace located in the North of the Gydan Peninsula near the village of Gyda. On the basis of the radiocarbon dating, the time of formation of deposits containing veins from was established – from 16 640 to 854 BP. The peat deposits are mainly represented by the following species: Carex sp., Eriophorum sp., Betula nana, Equisetum sp., Calamagrostis sp., Vaccinium vitis-idaea, Drepanocladus sp., Empetrum sp., Vaccinium uliginosum, Rubus arcticus, Petasites sp. It is established that the polygonal-veined ice of khasyrey and interalas plateaus, except for vertical-striped «clean» ice, contain areas with vertical wavy streaks of ice-ground. Ice of elementary veins and segregation ice were revealed in the composition of veins according to structural and textural features in polarized light. Elementary ice veins compose «clean» ice sections of veins and segregation ice which are their ice-ground sections. Elementary veins are indicative of the predominance of the process of frost cracking during the formation of polygonal-vein ices. The presence of inclusions of ice-ground in the structure of veins points is evidence of a manifestation of local thermokarst processes under the growth of polygonal-vein ice. Ice-ground veins were formed by repeated thawing of the initial ice veins. The formation of ice-ground veins during syngenetic freezing of sediments of the second lake-alluvial terrace is related to uneven manifestation of thermokarst in different facies situations and and climate changes at the Early Pleistocene and Holocene.

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晚新新世-全新世吉旦北部第二湖冲积阶地冰脉结构与形成

在吉达村附近的吉丹半岛北部第二湖冲积阶地上，研究了哈塞雷高原和间田高原的同生冰和冰-地复合脉。在放射性碳定年的基础上，确定了含矿脉沉积物的形成时间为16640 ~ 854 BP。泥炭矿床主要有:Carex sp.、Eriophorum sp.、Betula nana、Equisetum sp.、Calamagrostis sp.、Vaccinium vitis- ideaea、Drepanocladus sp.、Empetrum sp.、Vaccinium uliginosum、Rubus arcticus、Petasites sp.等。研究表明，哈塞雷高原和间高原的多面体纹冰除垂直条纹“干净”冰外，还含有垂直波状冰纹的区域。根据偏振光的结构和纹理特征，在矿脉成分中发现了初等脉冰和偏析冰。初级冰脉由“干净”的冰脉和分离冰组成，分离冰是它们的冰地部分。在多角形脉状冰的形成过程中，初等脉状冰的冻裂过程占主导地位。脉状点结构中存在的冰地包裹体是在多角形脉状冰生长下局部热岩溶作用的表现。冰脉是由最初的冰脉反复融化而形成的。第二湖冲积阶地沉积物同生冻结过程中冰脉的形成与不同相条件下热岩溶的不均匀表现以及早更新世—全新世的气候变化有关。

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来源期刊

Led i Sneg-Ice and Snow GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

1.50

自引率

42.90%

发文量

审稿时长

8 weeks

期刊介绍： The journal was established with the aim of publishing new research results of the Earth cryosphere. Results of works in physics, mechanics, geophysics, and geochemistry of snow and ice are published here together with geographical aspects of the snow-ice phenomena occurrence in their interaction with other components of the environment. The challenge was to discuss the latest results of investigations carried out on Russia’s territory and works performed by Russian investigators together with foreign colleagues. Editorial board works in collaboration with Glaciological Association that is professional community of specialists in glaciology from all republics of the Former Soviet Union which are now new independent states. The journal serves as a platform for the presentation and discussion of new discoveries and results which help to elucidate the state of the Earth’s cryosphere and the characteristics of the evolution of the snow-ice processes and phenomena under the current conditions of rapid climate change.