Abstract
Los enriquecimientos de mercurio en la unidad de esquisto negro de la Formación ediacárica de Doushantuo son probablemente el resultado de la influencia volcánica o del depósito de mercurio mediante anoxia. Si los enriquecimientos de Hg son de origen volcánico, o se deben a una anoxia regional contemporánea, entonces los patrones de enriquecimiento de Hg son consistentes con la correlación convencional de estas unidades, con las unidades tripartitas equivalentes a la pizarra negra del Miembro IV. Además, la comparación de los datos redox de los intervalos de enriquecimiento en Hg podría indicar si los enriquecimientos se deben a cambios comparables en las condiciones redox, o a un aumento de la entrada de Hg bajo diferentes condiciones redox, consistente con la influencia volcánica.
Highlights
The Ediacaran Period is a critical time interval in the history of life, when environmental changes and evolutionary events set the stage for the Cambrian explosion of animal diversity (e.g. Marshall, 2006)
The Member IV is correlated to the tripartite Lower Black Shale, Upper Dolostone, and Miaohe Member; some δCcarb data suggests that only the Lower Black Shale correlates to the Member IV, the Miaohe Member correlates to the Shibantan Member and the Upper Dolostone correlates to the Hamajing Member of the overlying Dengying Formation (An et al, 2015)
These correlations have significant consequences for interpreting the age and duration of the Shuram Event and the age of the fossils preserved in these units (Zhou et al, 2017)
Summary
The Ediacaran Period is a critical time interval in the history of life, when environmental changes and evolutionary events set the stage for the Cambrian explosion of animal diversity (e.g. Marshall, 2006). Assessing the Ediacaran Doushantuo Formation: Improving stratigraphic correlation of the Upper Doushantuo Black Shales via mercury content. The Ediacaran Doushantuo Formation of South China hosts exceptionally preserved fossils and has yielded geochemical data detailing major events, most importantly the Shuram Carbon Isotope Anomaly (e.g. McFadden et al, 2009). Understanding these histories requires stratigraphic correlation between sections of the Doushantuo Formation, especially correlations among black shale units (Member IV, Miaohe Member, and Lower Black Shale).
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