Holocene environmental changes in the central Inner Mongolia, based on single-aliquot-quartz optical dating and multi-proxy study of dune sands
Holocene environmental changes in the central Inner Mongolia, based on single-aliquot-quartz optical dating and multi-proxy study of dune sands
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DOI：
10.1016/j.palaeo.2005.09.016
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
Jimin Sun;Sheng‐Hua Li;P. Han;Yong-Ye Chen
中科院分区：
文献类型：
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作者：
Jimin Sun;Sheng‐Hua Li;P. Han;Yong-Ye Chen
内蒙古中部沙丘砂和古土壤的交替单元暗示了东亚季风的盛衰对沙丘形成和稳定的多次反应。用单等分石英光学测年法测定了这些风成沉积的年代。结合矿床的多指标研究，重建了全新世以来的环境变化。研究结果表明，早全新世（11.5 ka ~ 9 ka）初期，研究区域发生了广泛的风成沙运动。在~ 9 ka ~ ~ 5.6 ka（全新世最佳）期间，气候变得温暖湿润。在~ 5.6 ka之后，根据沙丘形成推断，该地区再次变得干旱。然而，全新世晚期的环境变化受到气候和人类活动的双重影响，半干旱区沙漠环境的存在不仅是全新世晚期气候干旱的结果，而且与不良的土地利用方式有关。
Alternating units of dune sands and paleosols in the central Inner Mongolia imply multiple episodes of dune building and stabilization, in response to the waxing and waning of the East Asian monsoon. Such eolian deposits were dated by using the single-aliquot-quartz optical dating method. Combined with the multi-proxy study on the deposits, the past environmental changes during the Holocene have been reconstructed. Our results indicate that widespread eolian sand mobilization occurred in the studied region during the beginning of the early Holocene from 11.5 ka to ∼9 ka. The climate became warm and humid during the period between ∼9 ka and ∼5.6 ka (Holocene Optimum). After ∼5.6 ka, the region again became arid, as inferred from dune building. However, the environmental changes during the late Holocene have been affected by both climate and human impacts, and the presence of desert environment in such semiarid region is not only the result of climatic drought of the late Holocene, but also related to poor land-use practices.