华北南部济源地区三叠纪气候及其演变特征——来自古土壤地球化学的证据  

The Triassic climate and its evolutionary characteristics in Jiyuan area in south of North China Plate:Evidence from paleosol geochemistry

作　　者：杨文涛[1] 冯婉莹 张鸿禹 王敏[1] YANG Wentao;FENG Wanying;ZHANG Hongyu;WANG Min(School of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000

出　　处：《河南理工大学学报(自然科学版)》2025年第2期51-60,共10页Journal of Henan Polytechnic University(Natural Science)

基　　金：国家自然科学基金资助项目(42072123);河南省优秀青年基金资助项目(222300420046)。

摘　　要：目的三叠纪处于温室气候的快速波动期,古土壤记录了丰富的古气候信息。为了探讨三叠纪由极端温室向中等温室气候的转变过程,方法选取济源地区三叠纪地层中古土壤为研究对象,进行主量元素分析,定量估算年均降水量与年均温度,进而恢复三叠纪气候特征及其演变规律。结果结果表明:(1)济源地区三叠纪地层中识别出15层古土壤层(包括钙质土、有机土和潜育土)。(2)定量古气候重建结果显示,三叠纪年均降水量为447~1557 mm,温度为11~23℃。早三叠世,年均降水量为447~896 mm(早三叠世晚期,降水量呈增加趋势),温度为16~23℃(表现出下降的趋势);中三叠世,年均降水量为679~1539 mm,呈稳步升高趋势,温度为11~20℃,中三叠世中期降至最低;晚三叠世,年均降水量为575~1557 mm,晚三叠世早期和晚期降雨较少,中期降雨最多,温度为17~21℃,与降水量存在较好的正相关关系。(3)华北盆地三叠纪气候波动较普遍,早三叠世和中三叠世前期总体处于干旱炎热的大背景下,存在短暂的相对湿润时期;中三叠世后期,降雨量明显增加,开始向湿润气候转变;晚三叠世,降雨量波动较大,总体处于温暖湿润背景下,同时伴随相对干旱时期。结论研究结果可为三叠纪气候及其演变规律研究提供参考。Objectives The Triassic period was a period of rapid fluctuation of greenhouse climate,and the paleosol recorded abundant paleoclimate information.To study the climate change process from extreme to medium greenhouse,Methods the Triassic paleosoils in the Jiyuan area were selected as the research ob-ject to conduct principal element analysis to quantitatively estimate the annual average precipitation and temperature,and then reconstruct the paleclimate characteristics and evolution laws of the Triassic period.Results The results showed that,(1)15 layers of paleosol(including calcareous soil,organic soil and gleyed soil)were identified in the Triassic strata in Jiyuan area.The quantitative paleoclimate reconstruc-tion results show that the mean the meanannual precipitation in the Triassic period was 447~1557 mm/a,and the temperature was 11~23℃.In the Early Triassic,the mean annual precipitation was 447~896 mm(with an increasing trend in precipitation in the late Early Triassic),and the mean annual temperature was 16~23℃(showing a downward trendin the Middle Triassic),In the Middle Triassic,the mean annual pre-cipitation was 679~1539 mm/a showing a steady upward trend the mean annual temperature was 11~20℃.It dropped to its lowest point in the middle of the Middle Triassic.In the Late Triassic,the mean annual precipitation was 575~1557 mm/a.There was less rainfall in the early and late stages of the Late Triassic,and the most rainfall in the middle stage,with temperatures ranging from 17~21℃,showing a good posi-tive correlation with precipitation.(3)The climate fluctuations in the Triassic period of the North China Ba-sin were relatively common,and the Early Triassic and early Middle Triassic were generally under a back-ground of drought and heat,with a brief period of relative humidity.In the late Middle Triassic,rainfall in-creased significantly and began to shift towards a humid climate.In the Late Triassic,there was a signifi-cant fluctuation in rainfall,which was generally under a warm and humid backgr

关 键 词：三叠纪 气候演变 地球化学 济源地区 

分 类 号：P59[天文地球—地球化学]