Abstract

The sequence of sediment accumulation of the first and second terraces of the Tarbagataika River and changes in the stages of incision and filling, as well as sedimentation and soil formation over the last 14 kyr in the river valley were revealed. The dynamics of the sedimentation stages and of the phases of their stabilization and pedogenesis was determined by landscape-climatic changes in the study area. The period of geomorphologic formation of above-floodplain terraces was determined. The floodplain sedimentation regime was changed by the subaerial regime on the second terrace of the Tarbagataika River approximately 8 kyr BP. The accumulation of cover deposits on the first terrace began approximately 3.4 kyr BP. Deposits of the second terrace of the Tarbagataika River were formed during the Late Glacial and the Holocene during the last 14 kyr. They are composed of alluvial sediments that accumulated 14.0–8.0 kyr BP and of cover deposits, which accumulated 8.0–0 kyr BP. The first terrace of the Tarbagataika River of the Holocene age is composed of alluvial deposits, which were accumulated 7.0–3.4 kyr BP, and of deposits of the covering complex, which were formed over the last 3.4 kyr. The phases of intensification of erosion-accumulative processes related to increased water discharge were identified. The main stages of soil formation in the study area were determined. The data we obtained are in good agreement with the previously identified stages of pedogenesis in the Selenga middle mountains and adjacent regions of South-Eastern Siberia and Mongolia.

中文翻译：

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晚冰期和全新世塔尔巴加泰卡河阶地（西外贝加尔）的形成

摘要

揭示了塔尔巴加泰卡河第一梯田和第二梯田的沉积序列、切入和充填阶段的变化以及河谷最后14 kyr的沉积和土壤形成。沉积阶段及其稳定和成土阶段的动态由研究区的景观气候变化决定。确定了漫滩以上阶地的地貌形成时期。在大约 8 kyr BP 的 Tarbagataika 河第二阶地上，漫滩沉积状态改变了。第一个阶地覆盖沉积物的积累开始于大约 3.4 kyr BP。Tarbagataika 河第二阶地沉积形成于晚冰期和最后 14 kyr 的全新世。它们由累积 14.0-8.0 kyr BP 的冲积沉积物和累积 8.0-0 kyr BP 的覆盖沉积物组成。全新世塔尔巴加泰卡河第一个阶地由 7.0-3.4 kyr BP 的冲积沉积物和在过去 3.4 kyr 形成的覆盖杂岩沉积物组成。确定了与排水量增加有关的侵蚀累积过程加剧的阶段。确定了研究区土壤形成的主要阶段。我们获得的数据与先前确定的色楞格中部山区以及东南西伯利亚和蒙古相邻地区的成土阶段非常一致。全新世塔尔巴加泰卡河第一个阶地由 7.0-3.4 kyr BP 的冲积沉积物和在过去 3.4 kyr 形成的覆盖杂岩沉积物组成。确定了与排水量增加有关的侵蚀累积过程加剧的阶段。确定了研究区土壤形成的主要阶段。我们获得的数据与先前确定的色楞格中部山区以及东南西伯利亚和蒙古相邻地区的成土阶段非常一致。全新世塔尔巴加泰卡河第一个阶地由 7.0-3.4 kyr BP 的冲积沉积物和在过去 3.4 kyr 形成的覆盖杂岩沉积物组成。确定了与排水量增加有关的侵蚀累积过程加剧的阶段。确定了研究区土壤形成的主要阶段。我们获得的数据与先前确定的色楞格中部山区以及东南西伯利亚和蒙古相邻地区的成土阶段非常一致。确定了与排水量增加有关的侵蚀累积过程加剧的阶段。确定了研究区土壤形成的主要阶段。我们获得的数据与先前确定的色楞格中部山区以及东南西伯利亚和蒙古相邻地区的成土阶段非常一致。确定了与排水量增加有关的侵蚀累积过程加剧的阶段。确定了研究区土壤形成的主要阶段。我们获得的数据与先前确定的色楞格中部山区以及东南西伯利亚和蒙古相邻地区的成土阶段非常一致。