内蒙古西乌旗地区中—晚更新世孢粉记录及其古气候意义
Sporopollen record during Mid-Late Pleistocene from West Ujimqin Banner,Inner Mongolia,and its paleoclimatic significance
杨兵 1陈喜庆 1葛天助 1韦一 2刘迁2
作者信息
- 1. 自然资源实物地质资料中心,河北廊坊 065201
- 2. 华北科技学院安全工程学院,河北廊坊 065201
- 折叠
摘要
为重建内蒙古西乌旗地区巴音华盆地中—晚更新世之交古气候,探讨其变化规律及对全球古气候的响应,对该盆地ZK03 钻孔和ZK04 钻孔孢粉化石进行系统鉴定,利用有序聚类分析划分孢粉组合,结合共存因子分析法对孢粉组合定量化建立研究区的古气候参数值.鉴定出孢粉 68 个科属,自下而上划分出(Ⅰ)松属(Pinus)-桦属(Betula)-香蒲属(Typha)孢粉组合;(Ⅱ)栎属(Quercus)-麻黄属(Ephedra)-蒿属(Artemisia)孢粉组合;(Ⅲ)莎草科(Cyperaceae)-香蒲属(Typha)-水龙骨科(Polypodiaceae)孢粉组合.其中,组合Ⅰ、组合Ⅱ时代为中更新世,组合Ⅲ时代为晚更新世.植被类型经历了阔叶林-草原型兼有少量针叶林→阔叶林-草原型→稀树-草原型的转变.古气候经历了由相对温暖的湿润型气候到相对温凉的半干旱型气候再到相对温暖的湿润型气候的 3 期转变,各期分别对应的年均气温和年降雨量在数值上也体现了由高到低再到高的变化过程.其中,在中更新世/晚更新世之交,气候经历由凉到温的变化趋势,与格陵兰冰芯氧同位素所指示的全球平均温度变化趋势相耦合.
Abstract
In order to reconstruct the paleoclimate and explore its evolution model and response to the global paleoclimate during the Mid-Late Pleistocene in the Bayinhua Basin,West Ujimqin Banner,Inner Mongolia,the sporopollen of ZK03 and ZK04 in the basin were systematically identified.Combining Coniss analyze with Co-existence Approach,we quantitatively reconstruct the palaeoclimate parameters in research area.68 genera are identified and divided into 3 assemblages as:(Ⅰ)Pinus-Betula-Typha assemblage;(Ⅱ)Quercus-Ephedra-Artemisia assemblage;(Ⅲ)Cyperaceae-Typha-Polypodiaceae assemblage.The age of assemblage Ⅰand assemblage Ⅱwas Middle Pleistocene,while the age of assemblage Ⅲwas Late Pleistocene.The vegetation types experienced the transformation as broadleaved-steppe type with a small amount of coniferous forest vegetation→broadleaved-steppe type vegetation→savanna-steppe vegetation.Palaeoclimate experienced three periods of transition from relatively warm and humid climate to relatively warm and cool semi-arid climate and then to relatively warm and humid climate.The annual average temperature and annual rainfall corresponding to each period also showed a numerical process of change from high to low and then to high.The trend from cool to warm at the turn of the Middle Pleistocene/Late Pleistocene can be well coupled with the trend of global mean temperature that indicated by the oxygen isotopes of Greenland ice core.
关键词
西乌旗/更新世/孢粉组合/古气候/地质调查工程/共存因子分析Key words
West Ujimqin Banner/Pleistocene/sporopollen assemblages/paleoclimate/geological survey engineering/Co-existence Approach引用本文复制引用
基金项目
国家自然科学基金项目(41702366)
中国地质调查局项目(DD20230138)
中央高校基本科研业务费(3142018004)
出版年
2024
国家科技期刊平台
NSTL
万方数据