沉积学报2025，Vol.43Issue(2)：668-682,15.DOI:10.14027/j.issn.1000-0550.2023.017
滇东会泽地区下寒武统渔户村组沉积地球化学特征与古环境重建
Sedimentary Geochemical Characteristics and Paleoenvironmental Reconstruction of the Lower Cambrian Yuhucun Formation in Huize Area,Eastern Yunnan
摘要
Abstract
[Objective]The Precambrian Ediacaran-Cambrian transition period is extremely important for the evolu-tion of early life on Earth.The explosion and radiation of multicellular life are closely related to the paleoclimate,sea-water oxygen content and marine sedimentary environment during this period.In order to reveal the paleoclimate and paleomarine environment during the early eruption of life in the Cambrian,and to understand the relationship be-tween the global paleomarine medium conditions and the co-evolution of early life in the early Cambrian,this study considers Cambrian strata in eastern Yunnan province which recorded the scenario of the eruption of life in the Cam-brian.[Methods]The petrological and sedimentological characteristics are based on detailed descriptions of typical outcrop sections in the field.The paleo-ocean,paleoclimate and paleoenvironment of the Yuhucun Formation in Zhu-jiaqing area,Huize,eastern Yunnan province were reconstructed from tests and analysis of major elements,trace elements and rare earth elements.[Results]The Yuhucun Formation in this region was found to be mainly a set of shallow marine carbonate rocks,accompanied by a small amount of clastic rocks and phosphorite.It was formed in the tidal flat facies belt of the carbonate platform,divided between supratidal-intertidal and subtidal microfacies.The U/Th,V/Cr and V/(V+Ni)values indicate that the paleo-ocean was in an oxygen-poor-anoxic environment during the deposition of the lower Cambrian Yuhucun Formation in the Huize area,and the seawater reducibility was generally weakened.The Sr/Ca and K/Na values indicate that the paleo-ocean salinity experienced three secondary increase/de-crease cycles.The Sr/Cu and SiO2/Al2O3 values indicate that the paleoclimate was generally arid,but fluctuating warming events during the period reflect dry/wet alternation in the early Cambrian.The regional sea-level change and paleoclimate are consistent with the early Cambrian.[Conclusions]This reconstruction of the paleomarine environ-ment and paleoclimate during the sedimentary period of the Yuhucun Formation in eastern Yunnan reveals the co-evolution of global biological evolution and sedimentary environment in the early Cambrian Newfoundland.关键词
扬子板块/渔户村组/朱家箐剖面/磷块岩/古环境Key words
Yangtze Plate/Yuhucun Formation/Zhujiaqing section/phosphorite/paleoenvironment分类
地质学引用本文复制引用
徐凯,马江波,成战刚,方泽鑫,杨永祯,郭岭..滇东会泽地区下寒武统渔户村组沉积地球化学特征与古环境重建[J].沉积学报,2025,43(2):668-682,15.基金项目
长庆油田重大科技专项项目(ZDZX2021-03) （ZDZX2021-03）
国家自然科学基金项目(42130206,41302076) （42130206,41302076）
大陆动力学国家重点实验室团队重点课题(201210128)[Major Science and Technology Projects of Changqing Oilfield,No.ZDZX2021-03 （201210128）
National Natural Science Foundation of China,No.42130206,41302076 （）
Key Project of the State Key Laboratory of Continental Dynamics,No.201210128] （）
