松嫩平原东部WKZK01钻孔第四纪地层岩性特征及环境地质意义  

Quaternary strata lithological characteristics and environmental geological significance of borehole WKZK01 in the eastern Songnen Plain

作　　者：陈阳阳 杨柯 于俊博[1,3] 张起鹏 杨志伟 乔绍忠 刘佳城 刘学 王晨晨 CHEN Yangyang;YANG Ke;YU Junbo;ZHANG Qipeng;YANG Zhiwei;QIAO Shaozhong;LIU Jiacheng;LIU Xue;WANG Chenchen(Harbin Center for Integrated Natural Resources Survey,China Geological Survey,Harbin 150086,Heilongjiang,China;Northeast Geologica S&T Innovation Center of China Geological Survey,Shenyang 110000,Liaoning,China;Observation and Research Station of Earth Critical Zone in Black Soil,Harbin,Ministry of Natural Resources,Harbin 150086,Heilongjiang,China;Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,Hebei,China)

机构地区：[1]中国地质调查局哈尔滨自然资源综合调查中心,黑龙江哈尔滨150086 [2]中国地质调查局东北地质科技创新中心,辽宁沈阳110000 [3]自然资源部哈尔滨黑土地地球关键带野外科学观测研究站,黑龙江哈尔滨150086 [4]中国地质科学院地球物理地球化学勘查研究所,河北廊坊065000

出　　处：《地质力学学报》2024年第6期952-964,共13页Journal of Geomechanics

基　　金：中国地质调查局地质调查项目(DD20242396,DD20211589,DD20240008);中国地质调查局东北地质科技创新中心区创基金项目(QCJJ2023-31)。

摘　　要：松嫩平原东部第四纪地层特征研究对于了解区域气候变化和沉积环境演化具有重要意义。然而,目前关于该区的第四纪地层研究较少,从而限制了对该区气候环境变化机理的理解。文章选择松嫩平原东部望奎WKZK01钻孔岩芯为研究对象,在岩性特征分析的基础上,利用光释光、孢粉和粒度等测试方法,对比分析哈尔滨荒山剖面的相关成果,对钻孔第四纪地层划分及所反映的沉积环境进行了探讨。将望奎县第四纪地层由老至新划分为:中更新统荒山组、中更新统哈尔滨组、上更新统顾乡屯组,无全新统坦途组。钻孔揭露荒山组厚13.05 m,为湖泊相,孢粉带I-1记录了中更新世早期凉干气候;哈尔滨组厚24.05 m,为湖泊相,孢粉带I-2记录了中更新世晚期凉湿气候;顾乡屯组厚15.6 m,为河流相,孢粉带Ⅱ记录了晚更新世冷湿气候。望奎WKZK01钻孔岩芯记录了松嫩古大湖周边面积较小的湖泊由湖心到湖滨最后消亡形成河流的环境演化过程。[Objective]Study of the Quaternary stratigraphical characteristics of the eastern Songnen Plain is of particular importance for gaining an understanding of regional climate change and the evolution of sedimentary environments.To data,however,there has been comparatively little research focusing on the Quaternary strata in this area,which has accordingly limited our comprehension of the mechanisms underlying changes in the regional climate and environment.[Methods]In this study we focused on the borehole WKZK01 in the eastern Songnen Plain.On the basis of lithological characteristic analysis,we obtained dating,sedimentary environment evolution,and climatic evolution information using optically stimulated luminescence,palynology,and laser grain size analytical methods,and based on comparisons with the results obtained from a typical Huangshan section,Harbin,we discuss the Quaternary stratigraphy of the borehole and the sedimentary environments it reflects.[Results]The Quaternary strata in Wangkui county are divided from old to new as follows:the middle Pleistocene Huangshan Formation,the middle Pleistocene Harbin Formation,and the upper Pleistocene Guxiangtun Formation,with an absence of a Holocene Tantu Formation.The Huangshan Formation is 13.05 m thick,with a median grain size(Md)ranging from 7.77μm to 11.84μm,and an average value of 9.62μm.Pollen zone I-1 is dominated by xerophytic herbaceous pollen,with small amounts of mixed coniferous and broadleaf woody plant pollen,although lacks pollen derived from hydrophilic herbaceous plant.The Harbin Formation is 24.05 m thick,with a median grain size(Md)ranging from 9.67μm to 14.98μm,and an average value of 11.74μm.Pollen zone I-2 is still dominated by xerophytic herbaceous pollen,with that derived from mixed coniferous and broadleaf woody plants as the secondary component,and the appearance of hydrophilic herbaceous plant pollen.The Guxiangtun Formation is 15.6 m thick,with a median grain size(Md)ranging from 11.61μm to 19.91μm,and an average value of 14.12μ

关 键 词：古环境 古气候 光释光 粒度 孢粉 松嫩平原 

分 类 号：P534.63[天文地球—第四纪地质学]