杨文涛,冯婉莹,张鸿禹,等.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[J].河南理工大学学报(自然科学版),doi:10.16186/j.cnki.1673-9787. 2023100013.

YANG W T,FENG W Y,ZHANG H Y,et al.Triassic climate and its evolution characteristics in Jiyuan Area，South of North China Plate：Evidence from paleosol geochemistry[J].Journal of Henan Polytechnic University( Natural Science),doi:10.16186/j.cnki.1673-9787. 2023100013.

华北南部济源地区三叠纪气候及其演变特征征分析——来自

古土壤地球化学的证据(网络首发)

杨文涛，冯婉莹，张鸿禹，王敏

河南理工大学 资源环境学院,河南 焦作 454000

摘要:目的 三叠纪处于温室气候的快速波动期，古土壤纪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 447~1 557 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 679~1 539 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 575~1 557 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。

关键词:三叠纪；气候演变；地球化学；济源地区

中图分类号：P59　

doi:10.16186/j.cnki.1673-9787. 2023100013

基金项目: 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）

收稿日期：：2023-10-16

修回日期：2023-12-04

网络首发日期：2024-01-24

Triassic climate and its evolution characteristics in Jiyuan Area，South of NorthChina Plate:Evidence from paleosol geochemistry

YANG Wentao，FENG Wanying，ZHANG Hongyu，WANG Min

（School of Resources and Environment，Henan Polytechnic University，Jiaozuo 454000，Henan，China）

Abstract: Objective The Triassic was in a period of rapid fluctuation of greenhouse climate，and the paleo⁃sol recorded abundant paleoclimate information. To study the climate change process from extreme to me⁃dium greenhouse，Methods the Triassic paleosoils in the Jiyuan area were selected for major chemical composition.The mean annual precipitation and mean annual temperature were estimated to reconstruct the paleoclimate and its evolution.Results The results show that 15 layers of paleosol（including calcareous soil，or⁃ganic soil and gleyed soil） are identified in the Triassic strata in Jiyuan area.The mean annual precipitationin the Jiyuan area during the Triassic was 447~1 557 mm/a，and the mean annual temperature was 11~23 ℃.In the Early Triassic，the mean annual precipitation was 447~896 mm，and elevated precipitation oc⁃curred in the late time. The mean annual temperature was 16~23 ℃ ，showing a downward trend. In the Middle Triassic，the mean annual precipitation was 679~1 539 mm/a，showing an increasing trend.The meanannual temperature was 11~20 ℃，and the low value occurred in the middle stage.In the Late Triassic，themean annual precipitation was 575~1 557 mm/a，with lower values in the early and late stages，and high values in the middle stage. Triassic climate fluctuation was relatively common in the south of North China.There was a relatively wet period in the Early Triassic，an overall wetting trend occurred in the Middle Triassic，and the Late Triassic also had dry periods.Conclusion These data can provide reference for the Trias⁃sic climate evolution.

Key words：Triassic；climate evolution；geochemistry；Jiyuan Area

CLC: P59