Abstract

A continuous record of paleogeographic events in the Shantar islands since the end of the Pleistocene has been obtained by a multy-proxy study of the stratigraphy of the blanket peatland. The biostratigraphical studies included botanical, diatom, and pollen analyses. The age-depth model has been developed using seven radiocarbon dates. Data on the development of the environment have been obtained for the first time in the coldest part of the Sea of Okhotsk. The paleoclimatic events were synchronous and metachronous with the regional data and the global changes. The Younger Dryas was much colder in the Shantar islands than in other areas around the Sea of Okhotsk. The climate became more marine after isolation of the islands in the early–middle Holocene. The cold sea and the drifting ice were among the major factors that resulted in the poorly defined early and middle Holocene optimums in this area and in the characteristics of the climatic rhythm. Models have been proposed to explain the alternation of relatively warm and cold periods with different humidity. The age of periods of heavy snowfall, as shown by changes in the role of dwarf pine in the island vegetation, has been estimated. The local swamp and zonal landscape phases have been highlighted. Spruce appeared in this area ~11 410–10 345 cal yr BP, when a landbridge existed; spruce trees became common in the middle Holocene, especially at the turn of the middle–late Holocene. The thermokarst processes were one of the controlling factors of swamp landscapes. The environment underwent major changes in the Little Ice Age; the most severe conditions occurred ~500–260 cal yr BP. In the most-recent 210 years, the most considerable changes in landscapes were related to fires of a human origin.

中文翻译：

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晚冰—全新世Bolshoi Shantar岛毯状泥炭地地层与环境发展

摘要

通过对毯状泥炭地地层的多重代理研究，获得了自更新世末期以来尚塔尔群岛古地理事件的连续记录。生物地层研究包括植物学、硅藻和花粉分析。年龄深度模型是使用七个放射性碳日期开发的。首次获得鄂霍次克海最冷部分环境发展数据。古气候事件与区域资料和全球变化同步和异时。新仙女木在尚塔尔群岛比鄂霍次克海周围的其他地区冷得多。在全新世早期-中期岛屿被隔离后，气候变得更加海洋化。寒冷的海水和流冰是导致该地区早、中全新世最优解和气候节律特征不明确的主要因素之一。已经提出模型来解释具有不同湿度的相对温暖和寒冷时期的交替。已经估计了大雪时期的年龄，如矮松在岛屿植被中的作用变化所示。局部沼泽和带状景观阶段已被突出显示。当陆桥存在时，该地区出现了云杉~11 410–10 345 cal yr BP；云杉树在全新世中期变得普遍，特别是在全新世中晚期之交。热岩溶过程是沼泽景观的控制因素之一。环境在小冰河时代发生了重大变化；最严重的情况发生在~500–260 cal yr BP。在最近的 210 年里，景观中最显着的变化与人为火灾有关。