| 张晓飞,李明辰,王林海,张学斌,樊航宇,张现珍,张明洋.内蒙古中北部ZK08孔892.8 Ka以来沉积特征及古环境演化[J].地质找矿论丛,2025,40(4):501-514 |
| 内蒙古中北部ZK08孔892.8 Ka以来沉积特征及古环境演化 |
| Depositional Characteristics and Paleoenvironmental Evolution of the ZK08 Hole in Central and Northern Inner Mongolia Since 892.8 Ka |
| 投稿时间：2025-05-11 修订日期：2025-11-13 |
| DOI：10.6053/j.issn.1001-1412.2025.04.007 |
| 中文关键词: 古环境变迁 孢粉记录 更新世 沉积粒度特征 892.8 Ka以来 内蒙古中北部 |
| 英文关键词:paleoenvironment change spore-pollen record Pleistocene sedimentary grain size characteristics since 892.8 Ka central and northern Inner Mongolia |
| 基金项目:中国地质调查局项目“大兴安岭成矿带南段地质矿产调查”（1212011120713）资助。 |
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| 中文摘要: |
| 本研究聚焦内蒙古中北部西乌旗朝鲁吐巴嘎盆地，旨在重塑892.8 Ka以来各关键阶段古气候转换特征及其沉积环境协同演变历程。对该区域古气候波动规律展开全面且深入的探讨，这对于精准揭示区域古气候演变的内在机制具有重要的意义。本次研究采用多学科交叉方式，融合岩石学、粒度分析、孢粉研究以及光释光测年等领域的方法，针对朝鲁吐巴嘎盆地ZK08钻孔开展了系统而全面的研究工作。研究区古植被类型及古气候自892.8 Ka以来主要经历了以下多个关键阶段的演变历程：892.8 Ka~780 Ka，植被以榆属和松属为主，在山脚下地势低洼的滞水区发育少量蕨类孢子，该区域植被类型主要呈现为针阔叶混交林与草原相互交织的景观格局，当时降水量相对丰沛，气温适宜，整体气候展现出显著的温暖湿润特征；780 Ka~450.5 Ka，山地生态环境显著变迁，森林面积萎缩，乔木类植被变得稀疏，植被景观格局演变为稀疏的针阔叶混交林-草原组合，气候寒凉较轻湿，体现出气候系统与生态系统的耦合响应关系；450.5 Ka~213.8 Ka，植被类型逐渐过渡为针阔叶混交林-草原景观，该阶段气候显著向温和湿润转型；213.8 Ka~118.4 Ka，植被类型为荒漠-草原景观，气候寒凉干旱，该时期气候急剧变冷，林地覆盖率较低；118.4 Ka~63.7Ka是气候转变的重要阶段，气温回转明显，气候转变为温暖湿润，植被类型以疏林-草原景观为主；63.7 Ka~12.8 Ka，气候变得异常寒冷干旱，云杉属突然出现，该时期山地以针叶林为主，区域整体植被类型为针叶林-草原植被景观；12.8Ka至今，温度逐渐回暖，气候环境整体转换为适宜人类居住的温凉湿润气候，植被类型以针阔叶混交林-草原植被景观为主。研究表明自892.8 Ka研究区共经历了三次关键的气候环境转型期，分别在780 Ka、118.4 Ka和12.8 Ka前后，并对应于早更新世-中更新世-晚更新世-全新世交替的关键阶段，研究结果对中国北部区域地质演化和全球气候变化研究具有重要的参考价值。 |
| 英文摘要: |
| This study focuses on the Chaolu Tubaga Basin in Xiwu Banner, north-central Inner Mongolia, and aims to reshape the paleoclimate transition characteristics of each key stage since the late Early Pleistocene and the co-evolution of its sedimentary environment. Conducting a comprehensive and in-depth discussion on the fluctuation patterns of paleoclimate in this region is of great significance for accurately revealing the internal mechanism of regional paleoclimate evolution. This study adopted a multidisciplinary approach, integrating methods from petrology, particle-size analysis, spore-pollen research, and optical luminescence dating, and conducted systematic, comprehensive research on the ZK08 borehole in the Chaolu Tubaga Basin. The paleo vegetation and paleoclimate of the study area have mainly experienced the following key stages of evolution since 892.8 Ka: 892.8 Ka~780 Ka, the vegetation is mainly composed of Ulmus and Pinus, with a small number of fern spores developing in the low-lying stagnant area at the foot of the mountain. The vegetation type in this area mainly presents a landscape pattern of intertwined coniferous and broad-leaved mixed forests and grasslands. At that time, precipitation was relatively abundant, the temperature was suitable, and the overall climate showed significant characteristics of a warm, humid climate. 780 Ka~450.5 Ka, the mountainous ecological environment has changed significantly, the forest area has shrunk, the tree vegetation has become sparse, and the vegetation landscape pattern has evolved into a sparse coniferous and broad-leaved mixed forest-grassland combination. The climate is cold and lighter, reflecting the coupled response relationship between the climate system and the ecosystem; 450.5 Ka~213.8 Ka, the vegetation type gradually transitions to a coniferous and broad-leaved mixed forest-steppe landscape, and the climate at this stage significantly transitions to a mild and humid climate; 213.8 Ka~118.4 Ka, the climate is cold and dry, the climate sharply cools during this period, the woodland forest coverage rate is low, and the vegetation type is a desert-steppe landscape; 118.4 Ka~63.7 Ka is an important stage of climate change, the temperature reverses significantly, the climate changes to a warm and humid one, and the vegetation type is mainly sparse forest-steppe landscape; 63.7 Ka~12.8 Ka, the climate became extremely cold and dry, and Picea suddenly appeared. During this period, the mountains were mainly dominated by coniferous forests, and the vegetation type was desert-steppe vegetation landscape; since 12.8 Ka, the temperature has gradually warmed up, and the overall climate environment has transformed into a warm, cool and humid climate suitable for human habitation. The vegetation is mainly coniferous and broad-leaved mixed forest-steppe. The study shows that the study area has experienced three key climate and environmental transition periods since 892.8 Ka, respectively around 780 Ka, 118.4 Ka, and 12.8 Ka, which correspond to the key stages of the early Pleistocene-middle Pleistocene-late Pleistocene-Holocene transition. It has an important reference value for the study of regional geological evolution and global climate change in northern China. |
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