Distribution of selenium and arsenic in differentiated multicellular eukaryotic fossils and their significance  

作　　者：Jie Long Shixi Zhang Kunli Luo 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China [2]University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Geoscience Frontiers》2020年第3期821-833,共13页地学前缘（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41172310 and 41877299)。

摘　　要：We present variation patterns of trace elements within different sequences of the Ediacaran Doushantuo Formation(DST,635-551 million years ago),and inside the cells of the earliest differentiated multicellular eukaryotic fossils of the Weng'an biota in the Weng'an County of Guizhou Province.The results showed that selenium is the most enriched and significantly varied trace element among the 22 trace elements throughout the DST,followed by arsenic.The highest selenium and arsenic content sequences are consistent with the first appeared sequence of the earliest differentiated multicellular eukaryotic fossils Megasphaera at the middle to upper parts of the DST.Nanoman secondary ion mass spectrometry analyses show that selenium and arsenic have an inhomogeneous and punctate distribution in the nucleus and cytoplasm.The nucleus has anomalously enriched levels of selenium and arsenic among the organelles.The selenium and arsenic concentrations exhibit a positive correlation with the diversity of fossilized Megasphaera.These new findings give us a clue that the anomalous enrichment of selenium and arsenic might contributes to the cell differentiation in Ediacaran Doushantuo period.

关 键 词：Trace elements enrichment Weng'an BIOTA EDIACARAN Megasphaera Cell differentiation 

分 类 号：Q911.2[天文地球—古生物学与地层学]