沉积学报2025，Vol.43Issue(2)：423-438,16.DOI:10.14027/j.issn.1000-0550.2023.012
华北克拉通南缘中元古界熊耳群大古石组沉积环境
Depositional Environment of the Dagushi Formation,Mesoproterozoic Xiong'er Group,Southern North China Block:Evidence from geochemical analysis
摘要
Abstract
[Objective]The Dagushi Formation of the Mesoproterozoic Xiong'er Group is the earliest sedimentary unit overlying the metamorphic crystalline basement at the southern margin of the North China Craton.Studies of the depositional environment and formation processes are highly significant for an understanding of the breakup of the Co-lumbia supercontinent and the sedimentary environment and tectonic setting of the early Xiong'er Group.However,systematic research on the sediment provenance and paleoenvironment of the Dagushi Formation is still lacking.[Methods]The provenance,sedimentary environment and tectonic setting of the Dagushi Formation were studied by analysis of major-and trace elements in the Dagushi Formation of the Xiong'er Group,Xiaogoubei area,Jiyuan,Henan Province.[Results]For the major elements,the results show that the fine-grained clastic rocks of the Dagushi Formation are close to their source,with the compositional maturity gradually decreasing upwards from the bottom.From bottom to top,the sediments are mainly erosional products of a mixture of mafic and felsic rocks,gradually changing from granites to felsic volcanic rocks,then to intermediate rocks.The composition of the ancient sediments in the upper member gradually increases.The Dagushi Formation was deposited in a warm,humid climate,with evi-dence of several climate fluctuations during that time.Analysis of trace elements and REE show that the lower Da-gushi Formation was formed in a relatively stable tectonic setting,and that the middle and upper segments were formed in an active tectonic setting.[Conclusions]Together with the evidence from previous studies,we conclude that the transition of sediment source,climate and tectonic environment during the deposition of the Dagushi Forma-tion of the Xiong'er Group was associated with crust activation and associated tectono-thermal events.A mantle plume uplifted and activated the crust,gradually developing the southern margin of the North China Craton into an ac-tive tectonic setting.The deposition of the Dagushi Formation occurred in a local depression.Early volcanism of the Xiong'er Group provided the sedimentary provenance for the Dagushi Formation.This study provides new evidence for a better understanding of the evolution of Early Mesoproterozoic tectonism and deposition in the North China Cra-ton.关键词
华北克拉通/熊耳群/主量、微量元素/古环境Key words
North China Craton/Xiong'er Group/major and trace elements/paleoenvironment分类
地质学引用本文复制引用
王俊,江武龙,余雅兰,华仕豪,孔凡浩,袁玉洁,王世炎..华北克拉通南缘中元古界熊耳群大古石组沉积环境[J].沉积学报,2025,43(2):423-438,16.基金项目
国家重点研发计划(2020YFA0714803) （2020YFA0714803）
云南省科技厅基础研究专项(202101AU070132) （202101AU070132）
云南大学"双一流"建设项目(C176220100135)[National Key Research and Development Program,No.2020YFA0714803 （C176220100135）
Yunnan Fundamental Research Projects,No.202101AU070132 （）
"Double First-class"Projects of Yunnan University,No.C176220100135] （）
