沉积学报2025，Vol.43Issue(2)：527-538,12.DOI:10.14027/j.issn.1000-0550.2023.024
郑州邙山黄土锆石U-Pb年龄谱
Zircon U-Pb Age Spectrum of Zhengzhou Loess:Provenance change of loess in the Late Quaternary
摘要
Abstract
[Objective]The Mangshan loess deposits located in central China Plain,along the southeastern Chinese Loess Plateau(CLP),preserve high-resolution records of paleoclimatic and paleoenvironmental variations at glacial-interglacial scale due to their large thickness and rapid accumulation rate.To explore the mechanism of Mangshan loess formation,as well as the difference and mechanism of the formation process between Mangshan loess and paleo-sol during the glacial and interglacial periods.[Methods]In this study,sixteen samples,including 4 202 detrital zir-con particles,comprising the steps of particle separation,target preparation,laser ablation,mass spectrometer test-ing,lead correction and the like,are analyzed for U-Pb dating from the Mangshan loess-paleosol sequence of the last glacial-interglacial cycle.[Results]The results reveal that the main age spectra peaked at 240 Ma,440 Ma,800-1000 Ma,1 800-2 000 Ma,and 2 500 Ma,indicating that the provenances of Mangshan loess were located in the northeastern Qinghai-Tibetan Plateau and North China Craton.During the last glacial period,denudation materials from the upper reaches of the Yellow River in the northeastern Tibetan Plateau increased,and the eroded sediments were carried by fluvial runoff to the lower reaches of the Yellow River,closing to the Mangshan loess deposit site.During the interglacial period,the contribution of the proximal source materials to the Mangshan loess deposits inten-sified,and the contribution increased by 10％.[Conclusions]Investigation of the provenance of Mangshan loess can help to better understand the Late Quaternary sedimentary environment in central China,the coupling processes be-tween tectonics and climate as well as the Yellow River evolution during the Pleistocene.关键词
邙山黄土/碎屑锆石/U-Pb年龄/冰期—间冰期/物源Key words
Mangshan loess/detrital zircon/U-Pb age/glacial-interglacial/provenance分类
地质学引用本文复制引用
何静,鹿化煜,张瀚之,伍江,邵可涵..郑州邙山黄土锆石U-Pb年龄谱[J].沉积学报,2025,43(2):527-538,12.基金项目
国家自然科学基金项目(42021001,41920104005,42271001,41901004)[National Natural Science Foundation of China,No.42021001,41920104005,42271001,41901004] （42021001,41920104005,42271001,41901004）
