地质论评2025，Vol.71Issue(5)：1461-1472,12.DOI:10.16509/j.georeview.2025.01.052
福建益溪源区第四纪沉积环境及其对益溪河发展过程的指示
Quaternary sedimentary environment in the source area of the Yixi River,Yong'an,Fujian,and development process of the river implications
摘要
Abstract
Objectives:The Yixi River is a primary tributary of the Shaxi River,which is upper tributary of the Minjing River,valley geomorphology of the Yixi River is more representative in Fujian Province. Methods:In this study,we completed a Quaternary broehole(GC4)with Quaternary 22.4 m in the source area of the Yixi River,analyzed sedimentary environment according to AMS14C,Grain-size and magnetic susceptibility.Discussed sedimentary environment in the source area of the Yixi River and development process of the river implications by comparison of regional lithostratigraphy and characteristic of valley geomorphology. Results:GC4 was divided to 5 sedimentary stages from middle of Late Pleistocene till now:fluvial facies,limnetic facies,weathering lacustrine facies,pluvial facies and fluvial facies.Sedimentary discontinuity happened in later Late Pleistocene. Conclusions:Sedimentary environment in the source area reflected regional neotectonic movements were as follows:uplift,sinking,steady,uplift rapidly,sinking first and then sinking,uplift durably,corresponding valley geomorphology consisted in in the source area,upper and middle of the Yixi River.The river appeared in middle of Late Pleistocene,valley geomorphology completely developed in middle of Holocene.The most rapidly uplift occurred in later Late Pleistocene.关键词
河流源区/沉积环境/粒度/磁化率/河谷地貌Key words
source area/sedimentary environment/Grain-size/magnetic susceptibility/valley geomorphology引用本文复制引用
赵举兴,张书光,林淑珍,叶俊,张鹏,李长安..福建益溪源区第四纪沉积环境及其对益溪河发展过程的指示[J].地质论评,2025,71(5):1461-1472,12.基金项目
本文为山东省专项经费(编号:LSKJ202203300)、2023年度黄土与第四纪地质国家重点实验室开放基金课题(编号:SKLLQG2328)和福建省自然科学基金(编号:2021J01349)的成果. This paper is supported by the fund of Shandong Province(No.LSKJ202203300),the Foundation of State Key Laboratory of Loess Science,Institute of Earth Environment,Chinese Academy of Sciences(No.SKLLQG2328)and Natural Science Foundation of Fujian Province(No.2021J01349) （编号:LSKJ202203300）
