摘要：The terminal Ediacaran to Lower Cambrian (538-521 Ma) documents the disappearance of Ediacaran soft-bodied biota and the diversification of early animals, including the emergence of small shelly fauna, archaeocyath sponges, and trilobites. Despite extensive study, the role of oceanic oxygenation in macroevolutionary events across this interval remains unclear, with understanding hindered by limited constraints on temporal and spatial variability in geochemical conditions, both regionally and globally. Here, we report multi-proxy geochemical data (including organic carbon concentrations, carbonate and organic carbon isotopes, Fe speciation, and redox sensitive trace elements) from three sections documenting different water-depths through the Early Cambrian (Terreneuvian) Yurtus Formation of the Tarim Basin, Northwest China. Our data reveal a highly dynamic oxygen minimum zone (OMZ), distinguished by a core of unstable ferruginous to dysoxic conditions, with peripheral dysoxic to oxic conditions that developed on the inner-outer shelf at different stages. The temporal and spatial extent of the OMZ appears to have been controlled by changes in productivity, driven by sea-level and climatic influences on upwelling. We expand on regional observations by considering published geochemical data from globally distributed successions across this interval, in addition to the lowest global occurrence of key fossil taxa. Our integration of regional and global geochemical data sets, alongside mechanistic insight from regional and global stratal stacking patterns, suggest that marine redox fluctuations responded dynamically to changes in upwelling driven by major sea level transgression and climate. These connected processes and palaeoenvironmental conditions formed the backdrop for the main phase of the Cambrian explosion.

ISSN号：0016-7606

卷、期、页：卷137期7-8页3571-3586

发表日期：2025-03-10

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：GEOLOGICAL SOCIETY OF AMERICA BULLETIN

参与作者：Xiong, Yijun,Bowyer, Fred T.,Poulton, Simon W.

通讯作者：魏天媛

第一作者：蔡春芳

论文类型：期刊论文

论文概要：魏天媛,蔡春芳,Xiong, Yijun,Bowyer, Fred T.,Poulton, Simon W.，Environmental controls on Early Cambrian macroevolution: Insights from the Tarim Basin, Northwest China，GEOLOGICAL SOCIETY OF AMERICA BULLETIN，2025，卷137期7-8页3571-3586

论文题目：Environmental controls on Early Cambrian macroevolution: Insights from the Tarim Basin, Northwest China