沉积学报2026，Vol.44Issue(3)：921-944,24.DOI:10.14027/j.issn.1000-0550.2024.118
粤北丹霞盆地上白垩统陆相红层地球化学特征及其古气候意义
Geochemical Characteristics and Paleoclimate Significance of the Upper Cretaceous Continental Red Beds in the Danxia Basin,Northern Guangdong Province
摘要
Abstract
[Objective]The climate signals of the Danxia strata,a representative of Cretaceous continental red beds,offers key insights into red-bed sedimentation and Cretaceous geological events.[Methods]This study exam-ined fine-grained clastic rocks in the Upper Cretaceous Danxia Basin,specifically the Second member and Fourth member of the Changba Formation and the Jinshiyan member of the Danxia Formation.Sedimentology,elemental and isotopic geochemistry were used to investigate the sedimentary environment and paleoclimate significance during key Upper Cretaceous stages(Cenomanian,Turonian,Campanian).[Results]It was found that the fine-grained clastic rocks of these formations were deposited during a warm and humid climate phase,with suboxic to oxic water condi-tions.The water bodies were predominantly brackish,while localized high-salinity brackish and low-oxygen environ-ments(e.g.,the Fourth member of the Changba Formation)were associated with lake shrinkage and climatic aridifi-cation.Water depth variations exhibit trends of initial contraction followed by expansion,gradual contraction,then initial expansion followed by contraction,which align with the changes in sedimentary facies and environment.[Con-clusions]The Upper Cretaceous terrestrial sedimentary records of the Danxia Basin illustrate the climatic evolution of intermontane basins,shaped by global climate patterns of the Upper Cretaceous,as well as by significant influenc-es from local topographic and geomorphic features.关键词
上白垩统/丹霞盆地/陆相红层/地球化学/古气候Key words
Upper Cretaceous/Danxia Basin/continental red beds/geochemistry/paleoclimate分类
天文与地球科学引用本文复制引用
陈国辉,李超,李宏卫,查凯婕..粤北丹霞盆地上白垩统陆相红层地球化学特征及其古气候意义[J].沉积学报,2026,44(3):921-944,24.基金项目
广东国家公园建设专项资金(2021GJGY026) （2021GJGY026）
广东省2021年度自然资源事务管理—生态林业建设专项资金(2021GJGY001) （2021GJGY001）
中央高校基本科研业务费专项资金(B240201109) Guangdong Special Fund for National Park Construction,No.2021GJGY026 （B240201109）
Guangdong Special Fund for Ecological Forestry Construc-tion,No.2021GJGY001 （）
Fundamental Research Funds for the Central Universities,No.B240201109 （）
