Geochronology of Late Quaternary Events in Northeastern Russia
Geochronology of Late Quaternary Events in Northeastern Russia
复制标题
俄罗斯东北部晚第四纪事件的地质年代学
DOI：
--
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
A. Lozhkin
中科院分区：
文献类型：
--
作者：
A. Lozhkin
放射性碳定年古植物和孢粉样品记录了俄罗斯东北部晚更新世和全新世植被和气候的复杂变化。自50 ka前开始的卡金间断期（相当于威斯康星州中部）以来，我们可以区分出两个比现在更冷的时期。基尔基利亚克是最早的卡尔金斯基冷期，距今45-39 ka BP。第二个显著的冷期为33-30 ka BP。卡尔金间隔期与末次晚更新世冰期（萨尔坦期，相当于威斯康辛晚期冰期）的分界线始于27ka BP。俄罗斯东北部从草本苔藓苔原（萨尔坦）到轻针叶落叶松森林（全新世）的急剧变化可追溯到12.5 ka前。与木本植物向现代贫瘠苔原扩张有关的全新世热极大期可追溯到9.5-8 ka BP。
Radiocarbon-dated paleobotanical and palynological samples record complex changes of vegetation and climate in northeastern Russia during the Late Pleistocene and Holocene. Since the Kargin Interval (middle Wisconsin equivalent), which started 50 ka ago, we can distinguish two periods that were colder than the present. The Kirgilyakh was the earliest Karginsk cool period, dating to 45–39 ka BP. The second significant cool period dates to 33–30 ka BP. The boundary between the Kargin Interval and the last Late Pleistocene glaciation (Sartan, late Wisconsin equivalent) dates from 27 ka BP. The sharp change from herbaceous mossy tundra (Sartan) to light-coniferous larch forests (Holocene) in northeastern Russia dates to 12.5 ka ago. The Holocene thermal maximum, linked to the expansion of woody plants into the modern barren-ground tundra, dates from 9.5–8 ka BP.