地质找矿论丛2025，Vol.40Issue(4)：501-514,14.DOI:10.6053/j.issn.1001-1412.2025.04.007
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
摘要
Abstract
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 sedi-mentary 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 land-scape pattern of intertwined coniferous and broad-leaved mixed forests and grasslands.At that time,precipitation was rela-tively abundant,the temperature was suitable,and the overall climate showed significant characteristics of a warm,humid cli-mate.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 be-tween 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 cli-mate;213.8 Ka～118.4 Ka,the climate is cold and dry,the climate sharply cools during this period,the woodland forest cover-age 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 ap-peared.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.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Key words
paleoenvironment change/spore-pollen record/Pleistocene/sedimentary grain size characteristics/since 892.8 Ka/central and northern Inner Mongolia分类
天文与地球科学引用本文复制引用
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):501-514,14.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. （1212011120713）
